SLDP / Solid Power, Inc. - SEC 보고서, 연례 보고, 기업 사업 설명서

솔리드파워(주)
US ˙ NasdaqGS ˙ US83422N1054

기본 통계
CIK 1844862
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Solid Power, Inc.
SEC Filings (Chronological Order)
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May 21, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 20, 2026 Solid Power, Inc. (E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 20, 2026 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Number)

May 7, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 7, 2026 Solid Power, Inc. (Ex

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 7, 2026 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Number)

May 7, 2026 EX-99.1

Solid Power, Inc. (Nasdaq: SLDP) Company Overview May 2026

Exhibit 99.1 Solid Power, Inc. (Nasdaq: SLDP) Company Overview May 2026 Cautionary Note Regarding Forward - Looking Statements All statements other than statements of present or historical fact contained herein are “forward - looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, including

May 6, 2026 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2026 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-40284 SO

May 5, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 5, 2026 Solid Power, Inc. (Ex

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 5, 2026 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Number)

May 5, 2026 EX-99.1

SOLID POWER REPORTS FIRST QUARTER 2026 RESULTS

Exhibit 99.1 SOLID POWER REPORTS FIRST QUARTER 2026 RESULTS LOUISVILLE, Colo., May 5, 2026 – Solid Power, Inc. (Nasdaq: SLDP), a leading developer of solid-state battery technology, today announced its operational and financial results for the first quarter of 2026. Recent Business Highlights · Completed site acceptance testing for the SK On pilot cell line. · Began facilities construction and com

April 24, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 20, 2026 Solid Power, Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 20, 2026 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Numbe

April 9, 2026 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of th

April 9, 2026 ARS

ARS

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2025 or ☐ ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-40284 SOLID POWER, INC. (Ex

April 9, 2026 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   ) Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only

March 6, 2026 EX-99.1

Solid Power, Inc. (Nasdaq: SLDP) Company Overview March 2026

Exhibit 99.1 Solid Power, Inc. (Nasdaq: SLDP) Company Overview March 2026 Cautionary Note Regarding Forward - Looking Statements All statements other than statements of present or historical fact contained herein are “forward - looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, includi

March 6, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 5, 2026 Solid Power, Inc. (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 5, 2026 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Number

March 6, 2026 EX-10.1

1. Award No. 2. Modification No. 3. Effective Date 4. CFDA No. DE-MS0000122 0002 01/01/2026 81.253 ASSISTANCE AGREEMENT 486 S Pierce Avenue, Suite E 7. Period of Performance 01/01/2025 through 12/31/2026 6. Sponsoring Office Manufacturing &Energy Sup

Exhibit 10.1 1. Award No. 2. Modification No. 3. Effective Date 4. CFDA No. DE-MS0000122 0002 01/01/2026 81.253 ASSISTANCE AGREEMENT 486 S Pierce Avenue, Suite E 7. Period of Performance 01/01/2025 through 12/31/2026 6. Sponsoring Office Manufacturing &Energy Supply Chain U.S. Department of Energy 1000 Independence Avenue, SW Forrestal Building , MESC-1 Washington DC 20585 Louisville CO 800273123

February 25, 2026 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2025 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-40284 SOLID P

February 25, 2026 EX-FILING FEES

Table 1: Newly Registered Securities

Calculation of Filing Fee Tables S-8 Solid Power, Inc. Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee 1 Equity Common Stock, par value $0.0001 per share, to be issued pursuant to the Solid Power, Inc. 2021 Equity Incentive Pla

February 25, 2026 EX-10.29

SOLID POWER, INC. DIRECTORS’ DEFERRED EQUITY COMPENSATION PLAN (Adopted effective as of November 19, 2025) SECTION 1GENERAL

Exhibit 10.29 SOLID POWER, INC. DIRECTORS’ DEFERRED EQUITY COMPENSATION PLAN (Adopted effective as of November 19, 2025) SECTION 1GENERAL 1.1.Purpose and Effective Date. The board of directors (the “Board”) of Solid Power, Inc., a Delaware corporation (together with any successor to all or substantially all of its assets or business, the “Company”), has established the Solid Power, Inc. Directors’

February 25, 2026 S-8

As filed with the Securities and Exchange Commission on February 25, 2026

As filed with the Securities and Exchange Commission on February 25, 2026 Registration No.

February 25, 2026 EX-10.21

Fourth Amendment to Joint Development Agreement

Exhibit 10.21 CERTAIN IDENTIFIED INFORMATION HAS BEEN EXCLUDED FROM THE EXHIBIT BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY DISCLOSED. [* * *] INDICATES THAT INFORMATION HAS BEEN REDACTED. Fourth Amendment to Joint Development Agreement This Fourth Amendment (“Fourth Amendment”) to the Joint Development Agreement effective December 28, 2018 (“Original JD

February 25, 2026 EX-10.7

SOLID POWER, INC. 2021 EQUITY INCENTIVE PLAN RESTRICTED STOCK UNIT AGREEMENT NOTICE OF RESTRICTED STOCK UNIT GRANT

Exhibit 10.7 SOLID POWER, INC. 2021 EQUITY INCENTIVE PLAN RESTRICTED STOCK UNIT AGREEMENT NOTICE OF RESTRICTED STOCK UNIT GRANT Unless otherwise defined herein, the terms defined in the Solid Power, Inc. 2021 Equity Incentive Plan (the “Plan”) will have the same defined meanings in this Restricted Stock Unit Agreement which includes this Notice of Restricted Stock Unit Grant (this “Notice of Grant

February 25, 2026 EX-4.8

DESCRIPTION OF SECURITIES

Exhibit 4.8 DESCRIPTION OF SECURITIES The following is a summary of the material terms of our securities registered under Section 12 of the Securities Exchange Act of 1934, as amended, and certain provisions in our second amended and restated certificate of incorporation (the “Second A&R Charter”) and amended and restated bylaws (the “Bylaws”) as currently in effect. Because the following descript

February 25, 2026 EX-19

SOLID POWER, INC. INSIDER TRADING POLICY (Adopted on September 4, 2025 – Supersedes all prior versions)

Exhibit 19 SOLID POWER, INC. INSIDER TRADING POLICY (Adopted on September 4, 2025 – Supersedes all prior versions) A. POLICY OVERVIEW The Board of Directors (the “Board”) of Solid Power, Inc., a Delaware corporation (together with any subsidiaries, the “Company”), has adopted this Insider Trading Policy (this “Policy”) to help you comply with the federal and state securities laws and regulations t

February 24, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 24, 2026 Solid Power, In

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 24, 2026 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Nu

February 24, 2026 EX-99.1

SOLID POWER REPORTS FULL YEAR 2025 RESULTS

Exhibit 99.1 SOLID POWER REPORTS FULL YEAR 2025 RESULTS LOUISVILLE, Colo., February 24, 2026 – Solid Power, Inc. (Nasdaq: SLDP), a leading developer of solid-state battery technology, today announced its operational and financial results for the full year 2025 and provided its outlook and objectives for 2026. Recent Business Highlights · Announced a Joint Evaluation Agreement with Samsung SDI and

January 29, 2026 EX-4.1

PRE-FUNDED WARRANT TO PURCHASE SHARES OF COMMON STOCK solid power, Inc.

Exhibit 4.1 PRE-FUNDED WARRANT TO PURCHASE SHARES OF COMMON STOCK solid power, Inc. Warrant Shares:  Original Issuance Date: January 29, 2026 THIS PRE-FUNDED WARRANT TO PURCHASE SHARES OF COMMON STOCK (this “Warrant”) certifies that, for value received, or its assigns (the “Holder”) is entitled, upon the terms and subject to the limitations on exercise and the conditions hereinafter set forth, at

January 29, 2026 EX-99.1

SECURITIES PURCHASE AGREEMENT

Exhibit 99.1 SECURITIES PURCHASE AGREEMENT This Securities Purchase Agreement (this “Agreement”) is dated as of January 28, 2026, between Solid Power, Inc., a Delaware corporation (the “Company”), and each purchaser identified on the signature pages hereto (each, including its successors and assigns, a “Purchaser” and collectively the “Purchasers”). WHEREAS, subject to the terms and conditions set

January 29, 2026 424B5

The date of this prospectus supplement is January 28, 2026.

TABLE OF CONTENTS  Filed Pursuant to Rule 424(b)(5)  Registration No. 333-290078 PROSPECTUS SUPPLEMENT (To Prospectus dated January 28, 2026) 17,000,000 shares of common stock Pre-funded warrants to purchase up to 5,807,018 shares of common stock Common warrants to purchase up to 45,614,036 shares of common stock We are offering 17,000,000 shares of our common stock, par value $0.0001 per share, p

January 29, 2026 EX-FILING FEES

Security Type

Calculation of Filing Fee Tables S-3 Solid Power, Inc. Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial E

January 29, 2026 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): January 28, 2026 Solid Power, Inc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): January 28, 2026 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Num

January 29, 2026 EX-4.2

WARRANT TO PURCHASE SHARES OF COMMON STOCK SOLID POWER, Inc.

Exhibit 4.2 WARRANT TO PURCHASE SHARES OF COMMON STOCK SOLID POWER, Inc. Warrant Shares:  Original Issuance Date: January 29, 2026 THIS WARRANT TO PURCHASE SHARES OF COMMON STOCK (this “Warrant”) certifies that, for value received, or its assigns (the “Holder”) is entitled, upon the terms and subject to the limitations on exercise and the conditions hereinafter set forth, at any time on or after t

January 28, 2026 POSASR

As filed with the Securities and Exchange Commission on January 28, 2026

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on January 28, 2026 Registration No.

January 28, 2026 EX-FILING FEES

Security Type

Calculation of Filing Fee Tables S-3 Solid Power, Inc. Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial E

November 21, 2025 EX-10.1

SOLID POWER, INC.  SEVERANCE BENEFIT PLAN AND SUMMARY PLAN DESCRIPTION

Exhibit 10.1   SOLID POWER, INC.  SEVERANCE BENEFIT PLAN AND SUMMARY PLAN DESCRIPTION   1.          Introduction. The Solid Power, Inc. Executive Change in Control and Severance Plan (the “Prior Plan”) was established effective as of August 4, 2021 by Solid Power, Inc., a Delaware corporation (the “Company”), to provide opportunities with respect to specified benefits to certain key employees of t

November 21, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 19, 2025 Solid Power, In

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 19, 2025 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Nu

November 21, 2025 EX-10.2

SOLID POWER, INC. CHANGE IN CONTROL SEVERANCE PLAN FOR EXECUTIVES AND SUMMARY PLAN DESCRIPTION

Exhibit 10.2 SOLID POWER, INC. CHANGE IN CONTROL SEVERANCE PLAN FOR EXECUTIVES AND SUMMARY PLAN DESCRIPTION 1.             Introduction. The Solid Power, Inc. Executive Change in Control and Severance Plan (the “Prior Plan”) was established effective as of August 4, 2021 by Solid Power, Inc., a Delaware corporation (the “Company”), to provide opportunities with respect to specified benefits to cer

November 6, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 5, 2025 Solid Power, Inc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 5, 2025 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Num

November 6, 2025 EX-99.1

Solid Power, Inc. (Nasdaq: SLDP) Company Overview November 2025

Exhibit 99.1 Solid Power, Inc. (Nasdaq: SLDP) Company Overview November 2025 Cautionary Note Regarding Forward - Looking Statements All statements other than statements of present or historical fact contained herein are “forward - looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, incl

November 5, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2025 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-4028

November 4, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 4, 2025 Solid Power, Inc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 4, 2025 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Num

November 4, 2025 EX-99.1

SOLID POWER REPORTS THIRD QUARTER 2025 RESULTS

Exhibit 99.1 SOLID POWER REPORTS THIRD QUARTER 2025 RESULTS LOUISVILLE, Colo., November 4, 2025 – Solid Power, Inc. (Nasdaq: SLDP), a leading developer of solid-state battery technology, today announced its operational and financial results for the third quarter of 2025. Recent Business Highlights · Announced a Joint Evaluation Agreement with Samsung SDI and BMW to progress the development of all-

October 30, 2025 EX-10.1

Joint Evaluation Agreement

Exhibit 10.1 CERTAIN IDENTIFIED INFORMATION HAS BEEN EXCLUDED FROM THE EXHIBIT BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY DISCLOSED. [* * *] INDICATES THAT INFORMATION HAS BEEN REDACTED. Joint Evaluation Agreement This joint evaluation agreement ("Agreement") is entered into effective as of the date of the signature of the last Party to sign ("Effective

October 30, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 27, 2025 Solid Power, Inc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 27, 2025 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Num

October 30, 2025 EX-99.1

Solid Power Partners with Samsung SDI and BMW to Advance All-Solid-State Battery Technology Strategic Collaboration to Develop Next-Generation Batteries

Exhibit 99.1 Solid Power Partners with Samsung SDI and BMW to Advance All-Solid-State Battery Technology Strategic Collaboration to Develop Next-Generation Batteries Solid Power Announces a Joint Evaluation Agreement with Samsung SDI and BMW Group Louisville, Colo., Oct. 30, 2025 – Solid Power, Inc. (Nasdaq: SLDP), a leading U.S.-based developer of solid-state battery technology, is pleased to ann

September 5, 2025 S-3ASR

As filed with the Securities and Exchange Commission on September 5, 2025

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on September 5, 2025 Registration No.

September 5, 2025 EX-1.1

SOLID POWER, INC. COMMON STOCK EQUITY DISTRIBUTION AGREEMENT

Exhibit 1.1 SOLID POWER, INC. $150,000,000 COMMON STOCK EQUITY DISTRIBUTION AGREEMENT September 5, 2025 Oppenheimer & Co. Inc. 85 Broad Street, 26th Floor New York, New York 10004 Ladies and Gentlemen: Solid Power, Inc., a Delaware corporation (the “Company”), confirms its agreement (this “Agreement”) with Oppenheimer & Co. Inc., as follows: 1.             Issuance and Sale of Shares. The Company

September 5, 2025 EX-FILING FEES

Security Type

Calculation of Filing Fee Tables S-3 Solid Power, Inc. Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial E

September 5, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): September 5, 2025 Solid Power, In

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): September 5, 2025 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Nu

September 5, 2025 EX-FILING FEES

Security Type

Calculation of Filing Fee Tables S-3 Solid Power, Inc. Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial E

September 5, 2025 424B5

$150,000,000 Common Stock

TABLE OF CONTENTS  Filed Pursuant to Rule 424(b)(5)  Registration No. 333-290078 PROSPECTUS SUPPLEMENT (To Prospectus dated September 5, 2025) $150,000,000 Common Stock We have entered into an Equity Distribution Agreement, dated as of September 5, 2025 (the “Distribution Agreement”), with Oppenheimer & Co. Inc. (“Oppenheimer”) relating to the sale of shares of our common stock, par value $0.0001

August 7, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-40284 SOL

August 7, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 7, 2025 Solid Power, Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 7, 2025 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Numbe

August 7, 2025 EX-99.1

Solid Power, Inc. (Nasdaq: SLDP) Company Overview August 2025

Exhibit 99.1 Solid Power, Inc. (Nasdaq: SLDP) Company Overview August 2025 Cautionary Note Regarding Forward - Looking Statements All statements other than statements of present or historical fact contained herein are “forward - looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, includ

August 6, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 6, 2025 Solid Power, Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 6, 2025 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Numbe

August 6, 2025 EX-99.1

SOLID POWER REPORTS SECOND QUARTER 2025 RESULTS

Exhibit 99.1 SOLID POWER REPORTS SECOND QUARTER 2025 RESULTS LOUISVILLE, Colo., August 6, 2025 – Solid Power, Inc. (Nasdaq: SLDP), a leading developer of solid-state battery technology, today announced its operational and financial results for the second quarter of 2025. Recent Business Highlights · Reached a significant achievement in our partnership with BMW Group with BMW’s introduction of an i

May 30, 2025 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 26, 2025 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Number)

May 30, 2025 EX-10.1

Amendment to Assistance Agreement Award No. DE-MS0000122, dated May 15, 2025, between Solid Power Operating, Inc. and the U.S. Department of Energy

Exhibit 10.1 Amendment to Assistance Agreement Award No. DE-MS0000122 Pursuant to the May 15, 2025 Policy issued by the Department of Energy (DOE) Ensuring Responsibility for Financial Assistance, your award is hereby amended, effectively as of May 15, 2025, to add the following provision: Information Requests from DOE Periodically, in discharge of its oversight and administration responsibilities

May 22, 2025 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 21, 2025 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Number)

May 7, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-40284 SO

May 6, 2025 EX-99.1

SOLID POWER REPORTS FIRST QUARTER 2025 RESULTS

Exhibit 99.1 SOLID POWER REPORTS FIRST QUARTER 2025 RESULTS LOUISVILLE, Colo., May 6, 2025 – Solid Power, Inc. (Nasdaq: SLDP), a leading developer of solid-state battery technology, today announced its operational and financial results for the first quarter of 2025. Recent Business Highlights · Conducted detailed design of equipment for the planned installation of a continuous manufacturing pilot

May 6, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 6, 2025 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Number)

April 10, 2025 ARS

ARS

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-40284 SOLID POWER, INC. (Exact

April 10, 2025 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of th

April 10, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   ) Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only

March 19, 2025 EX-99.1

Solid Power, Inc. (Nasdaq: SLDP) Company Overview March 2025 Cautionary Note Regarding Forward - Looking Statements All statements other than statements of present or historical fact contained herein are “forward - looking statements” within the mean

Exhibit 99.1 Solid Power, Inc. (Nasdaq: SLDP) Company Overview March 2025 Cautionary Note Regarding Forward - Looking Statements All statements other than statements of present or historical fact contained herein are “forward - looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, includi

March 19, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 19, 2025 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Numbe

March 12, 2025 8-K

Financial Statements and Exhibits, Changes in Registrant's Certifying Accountant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 7, 2025 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Number

March 12, 2025 EX-16.1

Letter from Ernst & Young LLP, dated March 12, 2025.

Exhibit 16.1 March 12, 2025 Securities and Exchange Commission 100 F Street, N.E. Washington, DC 20549 Commissioners: We have read Item 4.01 of Form 8-K, dated March 12, 2025, of Solid Power, Inc. and are in agreement with the statements contained in the first through fourth paragraphs on page 2 therein. We have no basis to agree or disagree with other statements of the registrant contained therei

February 28, 2025 EX-97

Solid Power, Inc. Policy on Recovery of Incentive Compensation

Exhibit 97 SOLID POWER, INC. POLICY ON RECOVERY OF INCENTIVE COMPENSATION (Adopted on November 2, 2023) A. Introduction Solid Power, Inc., a Delaware corporation (the “Company”), has adopted this Policy on Recovery of Incentive Compensation (this “Policy”), which provides for the recovery of compensation in certain circumstances in the event of a restatement of financial results by the Company. Th

February 28, 2025 EX-19

Solid Power, Inc. Insider Trading Policy

Exhibit 19 SOLID POWER, INC. INSIDER TRADING POLICY (Adopted on August 4, 2023 – Supersedes all prior versions) A. POLICY OVERVIEW The Board of Directors (the “Board”) of Solid Power, Inc., a Delaware corporation (together with any subsidiaries, the “Company”), has adopted this Insider Trading Policy (this “Policy”) to help you comply with the federal and state securities laws and regulations that

February 28, 2025 EX-FILING FEES

Fee Table

Exhibit 107 Calculation of Filing Fee Table Form S-8 (Form Type) Solid Power, Inc.

February 28, 2025 S-8

As filed with the Securities and Exchange Commission on February 28, 2025

As filed with the Securities and Exchange Commission on February 28, 2025 Registration No.

February 28, 2025 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-40284 SOLID P

February 27, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 27, 2025 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Nu

February 27, 2025 EX-99.1

SOLID POWER REPORTS FULL YEAR 2024 RESULTS

Exhibit 99.1 SOLID POWER REPORTS FULL YEAR 2024 RESULTS LOUISVILLE, Colo., February 27, 2025 – Solid Power, Inc. (Nasdaq: SLDP), a leading developer of solid-state battery technology, today announced its operational and financial results for the full year 2024 and provided its outlook and objectives for 2025. Recent Business Highlights · Successfully progressed strategic partnerships through timel

January 24, 2025 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): January 21, 2025 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Num

January 24, 2025 EX-10.1

Assistance Agreement, dated January 1, 2025, between Solid Power Operating, Inc. and the U.S. Department of Energy

Exhibit 10.1 1. Award No. 2. Modification No. 3. Effective Date 4. CFDA No. DE-MS0000122 01/01/2025 81.253 ASSISTANCE AGREEMENT 486 S Pierce Avenue, Suite E 7. Period of Performance 01/01/2025 through 12/31/2025 6. Sponsoring Office Manufacturing &Energy Supply Chain U.S. Department of Energy 1000 Independence Avenue, SW Forrestal Building , MESC-1 Washington DC 20585 Louisville CO 800273123 Attn:

January 13, 2025 EX-10.1

Consulting Agreement, dated January 13, 2025, between Solid Power Operating, Inc. and Derek Johnson

Exhibit 10.1 CONSULTING AGREEMENT This CONSULTING AGREEMENT (this “Agreement”) is entered into on January 13, 2025 and is between Derek C. Johnson (“Consultant”), and Solid Power Operating, Inc., a Colorado corporation (“Solid Power,” and together with Consultant, the “Parties”). Article I Services 1.01            Description of Services. Solid Power has retained Consultant to provide the services

January 13, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): January 13, 2025 Solid Power, Inc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): January 13, 2025 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Num

December 17, 2024 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): December 16, 2024 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Nu

December 17, 2024 EX-10.1

Third Amendment to Joint Development Agreement, dated December 16, 2024, between Solid Power Operating, Inc. and Ford Motor Company

EX-10.1 2 tm2431234d1ex10-1.htm EXHIBIT 10.1 Exhibit 10.1 CERTAIN IDENTIFIED INFORMATION HAS BEEN EXCLUDED FROM THE EXHIBIT BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. [***] INDICATES THAT INFORMATION HAS BEEN REDACTED. Third Amendment to Joint Development Agreement This Third Amendment (“Third Amendment”) to the Joint Development Ag

November 8, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-4028

November 7, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 7, 2024 Solid Power, Inc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 7, 2024 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Num

November 7, 2024 EX-99.1

SOLID POWER REPORTS THIRD QUARTER 2024 RESULTS

Exhibit 99.1 SOLID POWER REPORTS THIRD QUARTER 2024 RESULTS LOUISVILLE, Colo., November 7, 2024 – Solid Power, Inc. (Nasdaq: SLDP), a leading developer of solid-state battery technology, today announced its operational and financial results for the third quarter of 2024. Recent Business Highlights · Selected by the U.S. Department of Energy for up to $50 million award negotiation for continuous pr

October 1, 2024 EX-10.1

Amendment No. 6 to Joint Development Agreement, effective September 30, 2024, between Solid Power Operating, Inc. and BMW of North America, LLC

Exhibit 10.1 CERTAIN IDENTIFIED INFORMATION HAS BEEN EXCLUDED FROM THE EXHIBIT BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. [***] INDICATES THAT INFORMATION HAS BEEN REDACTED. AMENDMENT NO. 6 to JOINT DEVELOPMENT AGREEMENT between BMW OF NORTH AMERICA, LLC 300 Chestnut Ridge Road Woodcliff Lake, NJ 07677 USA hereinafter referred to as

October 1, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): September 30, 2024 Solid Power, I

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): September 30, 2024 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File N

August 21, 2024 EX-10.1

Third Amendment to Lease, dated August 20, 2024, between Solid Power Operating, Inc. and Red Pierce, LLC

  Exhibit 10.1   THIRD AMENDMENT TO LEASE   THIS THIRD AMENDMENT TO LEASE (this “Amendment”) is made and entered into as of the date of Landlord’s signature below (the “Amendment Effective Date”), by and between Red Pierce, LLC, an Ohio limited liability company (“Landlord”), and Solid Power Operating, Inc., a Colorado corporation (“Tenant”).   WITNESSETH:   WHEREAS, Landlord and Tenant, formerly

August 21, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 20, 2024 Solid Power, Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 20, 2024 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Numb

August 7, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-40284 SOL

August 7, 2024 EX-10.3

Separation and Release Agreement with Kevin Paprzycki, dated July 11, 2024

SEPARATION AND RELEASE AGREEMENT This SEPARATION AND RELEASE AGREEMENT (this “Agreement”), dated as of the last date on the signature page of this Agreement, is between Solid Power Operating, Inc.

August 6, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 6, 2024 Solid Power, Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 6, 2024 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Numbe

August 6, 2024 EX-99.1

SOLID POWER REPORTS SECOND QUARTER 2024 RESULTS

Exhibit 99.1 SOLID POWER REPORTS SECOND QUARTER 2024 RESULTS LOUISVILLE, Colo., August 6, 2024 – Solid Power, Inc. (Nasdaq: SLDP), a leading developer of solid-state battery technology, today announced its operational and financial results for the second quarter of 2024. Recent Business Highlights · Received positive feedback from increased electrolyte sampling and made shipments to potential cust

June 24, 2024 EX-10.1

Amendment No. 5 to Joint Development Agreement, effective June 21, 2024, between Solid Power Operating, Inc. and BMW of North America, LLC

Exhibit 10.1 CERTAIN IDENTIFIED INFORMATION HAS BEEN EXCLUDED FROM THE EXHIBIT BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. [***] INDICATES THAT INFORMATION HAS BEEN REDACTED. AMENDMENT NO. 5 to JOINT DEVELOPMENT AGREEMENT between BMW OF NORTH AMERICA, LLC 300 Chestnut Ridge Road Woodcliff Lake, NJ 07677 USA hereinafter referred to as

June 24, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 21, 2024 Solid Power, Inc. (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 21, 2024 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Number

June 17, 2024 EX-99.1

Solid Power Appoints Renewables Industry Veteran Linda Heller as Chief Financial Officer · Company reaffirms 2024 guidance

Exhibit 99.1 Solid Power Appoints Renewables Industry Veteran Linda Heller as Chief Financial Officer · Company reaffirms 2024 guidance LOUISVILLE, Colo., June 17, 2024 - Solid Power, Inc. (Nasdaq: SLDP), a leading developer of solid-state battery technology, today announced that the board of directors has appointed Linda Heller as the company’s Chief Financial Officer and Treasurer, effective imm

June 17, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 14, 2024 Solid Power, Inc. (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 14, 2024 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Number

June 17, 2024 EX-10.1

Offer Letter with Linda Heller, dated June 14, 2024

  Exhibit 10.1   June 14, 2024   Re: Appointment as Chief Financial Officer and Treasurer   Dear Linda:   It is with great pleasure that I offer you a full-time employment position at Solid Power Operating, Inc. (the “Company” or “we”) in the position of Chief Financial Officer and Treasurer of the Company, beginning on June 17, 2024 (the actual first date of your employment, the “Effective Date”)

May 23, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 22, 2024 Solid Power, Inc. (E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 22, 2024 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Number)

May 9, 2024 EX-99.1

Solid Po

Exhibit 99.1 Solid Power, Inc. First Quarter 2024 Earnings Conference Call May 7, 2024 – 2:30pm MT Corporate Participants Jennifer Almquist, Investor Relations for Solid Power Inc. John Van Scoter, President and Chief Executive Officer Kevin Paprzycki, Chief Financial Officer and Treasurer Conference Call Participants Michael Shlisky, D.A. Davidson Brian Dobson, Chardan Capital Markets Jeffrey Cam

May 9, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 7, 2024 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Number)

May 8, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-40284 SO

May 7, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 7, 2024 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Number)

May 7, 2024 EX-99.1

SOLID POWER FIRST QUARTER 2024 RESULTS REFLECT CONTINUED PROGRESS TOWARDS 2024 GOALS

Exhibit 99.1 SOLID POWER FIRST QUARTER 2024 RESULTS REFLECT CONTINUED PROGRESS TOWARDS 2024 GOALS - Business, operational, and financial update call scheduled for 4:30 p.m. ET today LOUISVILLE, Colo., May 7, 2024 – Solid Power, Inc. (Nasdaq: SLDP), a leading developer of solid-state battery technology, today announced its operational and financial results for the first quarter of 2024. Recent Busi

April 11, 2024 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of th

April 11, 2024 ARS

ARS

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-40284 SOLID POWER, INC. (Exact

April 11, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   ) Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only

February 29, 2024 EX-99.1

1

Exhibit 99.1 Solid Power, Inc. Full Year 2023 Earnings Conference Call February 27, 2024 – 2:30pm MT Corporate Participants Jennifer Almquist, Investor Relations for Solid Power Inc. John Van Scoter, President and Chief Executive Officer Kevin Paprzycki, Chief Financial Officer and Treasurer Conference Call Participants Michael Shlisky, D.A. Davidson Jeffrey Campbell, Seaport Research Partners Bri

February 29, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 27, 2024 Solid Power, In

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 27, 2024 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Nu

February 28, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-40284 SOLID P

February 28, 2024 EX-21.1

List of Subsidiaries

Exhibit 21.1 Subsidiaries of Solid Power, Inc. Name of Subsidiary Jurisdiction of Organization Solid Power Operating, Inc. Colorado Solid Power Korea Co., Ltd. Republic of Korea

February 28, 2024 EX-97

Solid Power, Inc. Policy on Recovery of Incentive Compensation

Exhibit 97 SOLID POWER, INC. POLICY ON RECOVERY OF INCENTIVE COMPENSATION (Adopted on November 2, 2023) A. Introduction Solid Power, Inc., a Delaware corporation (the “Company”), has adopted this Policy on Recovery of Incentive Compensation (this “Policy”), which provides for the recovery of compensation in certain circumstances in the event of a restatement of financial results by the Company. Th

February 28, 2024 S-8

As filed with the Securities and Exchange Commission on February 28, 2024

As filed with the Securities and Exchange Commission on February 28, 2024 Registration No.

February 28, 2024 EX-FILING FEES

Fee Table

Exhibit 107 Calculation of Filing Fee Table Form S-8 (Form Type) Solid Power, Inc.

February 27, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 27, 2024 Solid Power, In

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 27, 2024 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Nu

February 27, 2024 EX-99.1

SOLID POWER FULL YEAR 2023 RESULTS REFLECT STRONG EXECUTION

Exhibit 99.1 SOLID POWER FULL YEAR 2023 RESULTS REFLECT STRONG EXECUTION - Business, operational, and financial update call scheduled for 4:30 p.m. ET today LOUISVILLE, Colo., February 27, 2024 – Solid Power, Inc. (Nasdaq: SLDP), a leading developer of solid-state battery technology, today announced its operational and financial results for the full year 2023 and provided its outlook and objective

February 9, 2024 SC 13G/A

SLDP / Solid Power, Inc. / FORD MOTOR CO - SC 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* Solid Power, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) (83422N105) (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the ru

February 9, 2024 EX-99.A

POWER OF ATTORNEY

Exhibit 99.A Exhibit A POWER OF ATTORNEY FORD MOTOR COMPANY (the “Company”) hereby constitutes and appoints each of Douglas J. Cropsey, Jonathan E. Osgood, Victoria Pool, and David J. Witten as its true and lawful attorney-in-fact, effective immediately, to: 1. Do anything on its behalf that is necessary or desirable to prepare, complete, and file in its name and on its behalf, whether individuall

January 29, 2024 SC 13G

SLDP / Solid Power, Inc. / BlackRock Inc. Passive Investment

us83422n1054012924.txt SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No: ) SOLID POWER INC - (Name of Issuer) Common Stock - (Title of Class of Securities) 83422N105 - (CUSIP Number) December 31, 2023 - (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to whi

January 23, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): January 23, 2024 Solid Power, Inc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): January 23, 2024 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Num

January 23, 2024 EX-99.1

Solid Power Announces $50 Million Share Repurchase Authorization

Exhibit 99.1 Solid Power Announces $50 Million Share Repurchase Authorization LOUISVILLE, Colo., January 23, 2024 – Solid Power, Inc. ("Solid Power") (Nasdaq: SLDP), a leading developer of solid-state battery technology, today announced that its Board of Directors has authorized the repurchase of up to $50 million of the company’s common stock. “This program is a reflection of our strong cash posi

January 16, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): January 10, 2024 Solid Power, Inc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): January 10, 2024 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Num

January 16, 2024 EX-99.1

Solid Power and SK On Deepen Partnership with New Agreements

Exhibit 99.1 Solid Power and SK On Deepen Partnership with New Agreements – Solid Power licenses cell designs and production processes to SK On – Solid Power to install pilot cell production line for SK On at Korea facility – Solid Power enters agreement to supply SK On with electrolyte LOUISVILLE, Colo., January 16, 2024 – Solid Power (Nasdaq: SLDP), a leading developer of solid-state battery tec

January 16, 2024 EX-10.3

Line Installation Agreement, dated January 10, 2024, among Solid Power Korea Co., Ltd., SK On Co., Ltd., and, for the limited purposes of Section 12.16 of the Line Installation Agreement, Solid Power, Inc.

  Exhibit 10.3   CERTAIN IDENTIFIED INFORMATION HAS BEEN EXCLUDED FROM THE EXHIBIT BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY DISCLOSED. [* * *] INDICATES THAT INFORMATION HAS BEEN REDACTED. Execution Version   LINE INSTALLATION AGREEMENT   This LINE INSTALLATION AGREEMENT (together with the schedules attached hereto, this “Agreement”) is entered into e

January 16, 2024 EX-10.1

Research and Development Technology License Agreement, dated January 10, 2024, between Solid Power Operating, Inc. and SK On Co., Ltd.

Exhibit 10.1 CERTAIN IDENTIFIED INFORMATION HAS BEEN EXCLUDED FROM THE EXHIBIT BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY DISCLOSED. [* * *] INDICATES THAT INFORMATION HAS BEEN REDACTED. Execution Version RESEARCH AND DEVELOPMENT TECHNOLOGY LICENSE Agreement This RESEARCH AND DEVELOPMENT TECHNOLOGY LICENSE Agreement (together with the exhibits attached

January 16, 2024 EX-10.2

Electrolyte Supply Agreement, dated January 10, 2024, between Solid Power Operating, Inc. and SK On Co., Ltd.

Exhibit 10.2 CERTAIN IDENTIFIED INFORMATION HAS BEEN EXCLUDED FROM THE EXHIBIT BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY DISCLOSED. [* * *] INDICATES THAT INFORMATION HAS BEEN REDACTED. Execution Version electrolyte supply agreement This electrolyte supply agreement (together with the schedules attached hereto, this “Agreement”) is entered into effecti

December 4, 2023 SC 13G/A

SLDP / Solid Power Inc - Class A / Volta Energy Technologies, LLC - SC 13G/A Passive Investment

SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* Solid Power, Inc. (Name of Issuer) Common Stock, par value $0.0001 (Title of Class of Securities) 83422N105 (CUSIP Number) November 30, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule

November 9, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 7, 2023 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Num

November 9, 2023 EX-99.1

1

Exhibit 99.1 Solid Power, Inc. Third Quarter 2023 Earnings Conference Call November 7, 2023 – 2:30pm MT Corporate Participants Jennifer Almquist, Investor Relations for Solid Power Inc. John Van Scoter, President and Chief Executive Officer Kevin Paprzycki, Chief Financial Officer and Treasurer Conference Call Participants Brian Dobson, Chardan Capital Markets Jeffrey Campbell, Seaport Research Pa

November 8, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-4028

November 7, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 7, 2023 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Num

November 7, 2023 EX-99.1

SOLID POWER RELEASES THIRD QUARTER 2023 RESULTS; SHIPS FIRST A-SAMPLE EV CELLS TO ENTER AUTOMOTIVE QUALIFICATION

Exhibit 99.1 SOLID POWER RELEASES THIRD QUARTER 2023 RESULTS; SHIPS FIRST A-SAMPLE EV CELLS TO ENTER AUTOMOTIVE QUALIFICATION - Business, operational, and financial update call scheduled for 4:30 p.m. ET today LOUISVILLE, Colo., November 7, 2023 – Solid Power, Inc. (Nasdaq: SLDP), a leading developer of solid-state battery technology, today announced its financial results for the third quarter end

August 10, 2023 EX-99.1

1

Exhibit 99.1 Solid Power, Inc. Second Quarter 2023 Earnings Conference Call August 8, 2023 – 3pm MT Corporate Participants Jennifer Almquist, Investor Relations for Solid Power Inc. David Jansen, Solid Power's Chairperson John Van Scoter, President and Chief Executive Officer Kevin Paprzycki, Chief Financial Officer and Treasurer Conference Call Participants Brian Dobson, Chardan Capital Markets O

August 10, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 8, 2023 Solid Power, Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 8, 2023 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Numbe

August 9, 2023 EX-99.1

Solid Power Announces Board Chairperson Transition and Retirement of David Jansen

Exhibit 99.1 Solid Power Announces Board Chairperson Transition and Retirement of David Jansen – Jansen to retire effective October 8, 2023 – John Stephens, Lead Independent Director, to succeed Jansen as Chairperson LOUISVILLE, Colo., August 8, 2023 – Solid Power, Inc. ("Solid Power") (Nasdaq: SLDP), a leading developer of solid-state battery technology, today announced that David Jansen, Solid P

August 9, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 4, 2023 Solid Power, Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 4, 2023 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Numbe

August 9, 2023 EX-10.1

Amendment to Interim CEO Agreement, dated August 7, 2023, between Solid Power, Inc. and David B. Jansen

Exhibit 10.1 AMENDMENT TO LETTER AGREEMENT This amendment (this “Amendment”) to the letter agreement, dated November 29, 2022 (the “Letter Agreement”), between David Jansen (“you”) and Solid Power, Inc. (the “Company”), is entered into by and between you and the Company, effective as of August 7, 2023 (the “Effective Date”). Capitalized terms used but not defined herein shall have the meanings giv

August 9, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-40284 SOL

August 8, 2023 EX-99.1

SECOND QUARTER 2023 RESULTS REFLECT CONTINUED STRONG EXECUTION

Exhibit 99.1 SECOND QUARTER 2023 RESULTS REFLECT CONTINUED STRONG EXECUTION - Business, operational and financial update call scheduled for 5:00 p.m. ET today LOUISVILLE, Colo., August 8, 2023 – Solid Power, Inc. (Nasdaq: SLDP), a leading developer of solid-state battery technology, today announced its financial results for the second quarter ended June 30, 2023. Recent Business Highlights · SP2 c

August 8, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 8, 2023 Solid Power, Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 8, 2023 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Numbe

July 10, 2023 EX-10.1

Solid Power, Inc. Outside Director Compensation Policy

Exhibit 10.1 SOLID POWER, INC. OUTSIDE DIRECTOR COMPENSATION POLICY Adopted and approved by Solid Power, Inc.’s Board of Directors, effective as of July 1, 2023 (the “Effective Date”). Solid Power, Inc. (the “Company”) believes that providing cash and equity compensation to members of its Board of Directors (the “Board,” and members of the Board, the “Directors”) represents an effective tool to at

July 10, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 5, 2023 Solid Power, Inc. (E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 5, 2023 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Number)

July 10, 2023 EX-99.1

Solid Power Appoints Two New Directors to the Board, Adding Financial, Human Resources, and Information Technology Expertise

Exhibit 99.1 Solid Power Appoints Two New Directors to the Board, Adding Financial, Human Resources, and Information Technology Expertise – Kaled Awada brings global leadership and human resources expertise – Susan Kreh brings financial and information technology expertise LOUISVILLE, Colo., July 10, 2023 – Solid Power, Inc. ("Solid Power") (Nasdaq: SLDP), a developer of solid state battery techno

July 5, 2023 EX-10.1

Second Amendment to Joint Development Agreement, dated June 30, 2023, between Solid Power Operating, Inc. and Ford Motor Company

Exhibit 10.1 CERTAIN IDENTIFIED INFORMATION HAS BEEN EXCLUDED FROM THE EXHIBIT BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. [***] INDICATES THAT INFORMATION HAS BEEN REDACTED. Second Amendment to Joint Development Agreement This Amendment (“Second Amendment”) to the Joint Development Agreement effective December 28, 2018 (“JDA”) and m

July 5, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 30, 2023 Solid Power, Inc. (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 30, 2023 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Number

May 31, 2023 EX-10.1

Offer Letter with John Van Scoter, dated May 26, 2023

Exhibit 10.1 May 26, 2023 John Van Scoter Re: Appointment as Chief Executive Officer Dear John: It is with great pleasure that I offer you a full-time employment position at Solid Power Operating, Inc. (the “Company” or “we”) in the position of President and Chief Executive Officer of Solid Power, Inc. (“Parent”), beginning on June 14, 2023 (the actual first date of your employment, the “Effective

May 31, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 26, 2023 Solid Power, Inc. (E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 26, 2023 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Number)

May 31, 2023 EX-99.1

Solid Power Appoints John Van Scoter President, CEO and Class I Director Renewable Energy Industry Expert and Technology Development and Commercialization Leader to Assume Role, Effective June 14

Exhibit 99.1 Solid Power Appoints John Van Scoter President, CEO and Class I Director Renewable Energy Industry Expert and Technology Development and Commercialization Leader to Assume Role, Effective June 14 LOUISVILLE, Colo., May 31, 2023 – Solid Power, Inc. (Nasdaq: SLDP), a developer of solid state battery technology, today announced that John Van Scoter has been appointed President, Chief Exe

May 25, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 24, 2023 Solid Power, Inc. (E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 24, 2023 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Number)

May 18, 2023 424B3

50,108,290 Shares of Common Stock 7,179,061 Warrants

TABLE OF CONTENTS   Filed Pursuant to Rule 424(b)(3)  Registration No. 333-261711 PROSPECTUS 50,108,290 Shares of Common Stock 7,179,061 Warrants This prospectus relates to the registration of shares of common stock, par value $0.0001 per share (the “Common Stock”), of Solid Power, Inc. (f/k/a Decarbonization Plus Acquisition Corporation III, “Solid Power,” the “Company,” “we,” “us” or “our”) and

May 12, 2023 EX-24.3

Power of Attorney

Exhibit 24.3 POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below hereby constitutes and appoints David B. Jansen, Kevin Paprzycki and James Liebscher, and each of them, as his or her true and lawful attorney-in-fact and agent with full power of substitution, for him or her in any and all capacities, to sign any and all amendments to this Registratio

May 12, 2023 POS AM

As filed with the Securities and Exchange Commission on May 12, 2023

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on May 12, 2023 Registration No.

May 10, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-40284 SO

May 8, 2023 EX-99.1

SOLID POWER, INC. ANNOUNCES FIRST QUARTER 2023 FINANCIAL RESULTS

Exhibit 99.1 SOLID POWER, INC. ANNOUNCES FIRST QUARTER 2023 FINANCIAL RESULTS - Financial results and business update call scheduled for 5:00 p.m. ET today LOUISVILLE, Colo., May 8, 2023 – Solid Power, Inc. (Nasdaq: SLDP), a developer of solid state battery technology, today announced its financial results for the first quarter ended March 31, 2023. Recent Business Highlights · SP2 electrolyte pro

May 8, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 8, 2023 Solid Power, Inc. (Ex

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 8, 2023 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Number)

April 10, 2023 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of th

April 10, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.     )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.     ) Filed by the Registrant  x Filed by a Party other than the Registrant  ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨

March 7, 2023 SC 13G

SLDP / Solid Power Inc - Class A / Volta Energy Technologies, LLC - SC 13G Passive Investment

SC 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Solid Power, Inc. (Name of Issuer) Common Stock, par value $0.0001 (Title of Class of Securities) 83422N105 (CUSIP Number) December 31, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pur

March 1, 2023 EX-10.30

Separation and Release Agreement with Jon Jacobs, dated February 10, 2023

Exhibit 10.30 SEPARATION AND RELEASE AGREEMENT This SEPARATION AND RELEASE AGREEMENT (this “Agreement”), dated as of the last date on the signature page of this Agreement, is between Solid Power Operating, Inc. (together with its parent company, Solid Power, Inc., collectively the “Company”) and Jon Jacobs (“Employee”) (collectively, the “parties”). Agreement In consideration of the mutual promise

March 1, 2023 EX-10.25

Letter Agreement with Joshua Buettner-Garrett, dated August 5, 2021

Exhibit 10.25 August 5, 2021 Josh Buettner-Garrett c/o Solid Power, Inc. Re: Confirmatory Employment Letter Dear Josh: This confirmatory employment letter agreement (the “Agreement”) is entered into between you and Solid Power, Inc. (the “Company” or “we”), effective as of the date both parties sign below (the “Effective Date”), to confirm the terms and conditions of your employment with the Compa

March 1, 2023 EX-10.26

Offer Letter with James Liebscher, dated June 9, 2021

Exhibit 10.26 June 9, 2021 James Liebscher [***] Subject: Offer of Employment Dear James, It is with great pleasure that I offer you a full-time employment position at Solid Power, Inc. (“Company”) under the exempt position of Lead Corporate Attorney reporting to the President of Solid Power, Dave Jansen. The terms of this offer are as follows: 1. Your employment with the Company shall be in accor

March 1, 2023 SC 13D

SLDP / Solid Power Inc - Class A / Decarbonization Plus Acquisition Sponsor III LLC - SC 13D Activist Investment

SC 13D UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No.

March 1, 2023 EX-10.27

Offer Letter with Kevin Paprzycki, dated September 30, 2021

Exhibit 10.27 September 30, 2021 Kevin A. Paprzycki [***] Subject: Offer of Employment Dear Kevin, It is with great pleasure that I offer you a full-time employment position at Solid Power, Inc. (“Company”) under the exempt position of Chief Financial Officer reporting to Doug Campbell, Chief Executive Officer. Your start date is expected to be October 25, 2021, subject to standard corporate appro

March 1, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-40284 SOLID P

March 1, 2023 EX-99.2

JOINT FILING AGREEMENT

EX-99.2 Exhibit 99.2 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with each other on behalf of each of them of such a statement on Schedule 13D and any amendment thereto with respect to the common stock beneficially owned by each of them of Solid Power, Inc. This Joint

February 28, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 28, 2023 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Nu

February 28, 2023 EX-99.1

SOLID POWER, INC. ANNOUNCES FULL YEAR 2022 FINANCIAL RESULTS

Exhibit 99.1 SOLID POWER, INC. ANNOUNCES FULL YEAR 2022 FINANCIAL RESULTS - Financial results and business update call scheduled for 5:00 p.m. ET today LOUISVILLE, Colo., February 28, 2023 – Solid Power, Inc. (Nasdaq: SLDP), a developer of solid state battery technology, today announced its financial results for the full year ended December 31, 2022. Recent Business Highlights · Electrolyte produc

February 13, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 8, 2023 Solid Power, Inc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 8, 2023 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Num

February 13, 2023 424B3

89,684,845 Shares of Common Stock 7,666,667 Warrants

PROSPECTUS SUPPLEMENT NO. 13 Filed Pursuant to Rule 424(b)(3) (To Prospectus dated April 5, 2022) Registration No. 333-261711 89,684,845 Shares of Common Stock 7,666,667 Warrants This prospectus supplement supplements the prospectus dated April 5, 2022 (as supplemented to date, the “Prospectus”), which forms part of our Registration Statement on Form S-1 (No. 333-261711) for which Post-Effective A

February 9, 2023 SC 13G

SLDP / Solid Power Inc - Class A / BlackRock Inc. Passive Investment

us83422n1054020923.txt SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No: 1) SOLID POWER INC - (Name of Issuer) Class A Common Stock - (Title of Class of Securities) 83422n105 - (CUSIP Number) January 31, 2023 - (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuan

February 8, 2023 SC 13G

SLDP / Solid Power Inc - Class A / BlackRock Inc. Passive Investment

SC 13G 1 us83422n1054020823.txt us83422n1054020823.txt SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No: ) SOLID POWER INC - (Name of Issuer) Class A Common Stock - (Title of Class of Securities) 83422n105 - (CUSIP Number) December 31, 2022 - (Date of Event Which Requires Filing of this Statement) Check the appropriate b

January 4, 2023 SC 13D/A

SLDP / Solid Power Inc - Class A / Campbell Douglas M - SC 13D/A Activist Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A Under the Securities Exchange Act of 1934 (Amendment No. 5)* Solid Power, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 83422N 105 (CUSIP Number) Douglas Campbell 417 Gay Street Longmont, CO 80501 (970) 718-2869 (Name, Address and Telephone Number of Person Authorized to Receiv

December 21, 2022 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): December 20, 2022 Solid Power, In

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): December 20, 2022 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Nu

December 21, 2022 EX-10.1

Amendment No. 4 to Joint Development Agreement, dated December 20, 2022, between Solid Power Operating, Inc. and BMW of North America, LLC

Exhibit 10.1 CERTAIN IDENTIFIED INFORMATION HAS BEEN EXCLUDED FROM THE EXHIBIT BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY DISCLOSED. [* * *] INDICATES THAT INFORMATION HAS BEEN REDACTED. AMENDMENT NO. 4 to JOINT DEVELOPMENT AGREEMENT between BMW OF NORTH AMERICA, LLC 300 Chestnut Ridge Road Woodcliff Lake, NJ 07677 USA hereinafter referred to as ?BMW? a

December 21, 2022 EX-99.1

Solid Power and BMW Deepen Joint Development Partnership

Exhibit 99.1 Solid Power and BMW Deepen Joint Development Partnership - Solid Power licenses cell design and manufacturing processes to the BMW Group to allow for parallel research and development activities - The BMW Group intends to replicate Solid Power’s cell pilot production lines at its facilities in Germany - Solid Power expects to provide sulfide-based solid electrolyte for the BMW Group’s

December 21, 2022 424B3

89,684,845 Shares of Common Stock 7,666,667 Warrants

PROSPECTUS SUPPLEMENT NO. 12 Filed Pursuant to Rule 424(b)(3) (To Prospectus dated April 5, 2022) Registration No. 333-261711 89,684,845 Shares of Common Stock 7,666,667 Warrants This prospectus supplement supplements the prospectus dated April 5, 2022 (as supplemented to date, the “Prospectus”), which forms part of our Registration Statement on Form S-1 (No. 333-261711) for which Post-Effective A

December 2, 2022 424B3

89,684,845 Shares of Common Stock 7,666,667 Warrants

PROSPECTUS SUPPLEMENT NO. 11 Filed Pursuant to Rule 424(b)(3) (To Prospectus dated April 5, 2022) Registration No. 333-261711 89,684,845 Shares of Common Stock 7,666,667 Warrants This prospectus supplement supplements the prospectus dated April 5, 2022 (as supplemented to date, the ?Prospectus?), which forms part of our Registration Statement on Form S-1 (No. 333-261711) for which Post-Effective A

December 2, 2022 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): December 1, 2022 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Num

December 2, 2022 EX-10.1

Second Amendment to Lease Agreement by and between the Company and Red Pierce, LLC, dated December 1, 2022

Exhibit 10.1 CERTAIN IDENTIFIED INFORMATION HAS BEEN EXCLUDED FROM THE EXHIBIT BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) CONFIDENTIAL. [ * * * ] INDICATES THAT INFORMATION HAS BEEN REDACTED. SECOND AMENDMENT TO LEASE THIS SECOND AMENDMENT TO LEASE (this ?Amendment?) is made and entered into as of the date of Landlord?s signature below (the ?Amendment Effective Date?), by and between Red Pierce,

November 29, 2022 424B3

89,684,845 Shares of Common Stock 7,666,667 Warrants

PROSPECTUS SUPPLEMENT NO. 10 Filed Pursuant to Rule 424(b)(3) (To Prospectus dated April 5, 2022) Registration No. 333-261711 89,684,845 Shares of Common Stock 7,666,667 Warrants This prospectus supplement supplements the prospectus dated April 5, 2022 (as supplemented to date, the ?Prospectus?), which forms part of our Registration Statement on Form S-1 (No. 333-261711) for which Post-Effective A

November 29, 2022 EX-10.1

Interim CEO Agreement with David Jansen, dated November 29, 2022

Exhibit 10.1 November 29, 2022 David B. Jansen c/o Solid Power, Inc. Re: Appointment as Temporary Chief Executive Officer Dear Dave: This letter agreement (this “Agreement”) is entered into between you and Solid Power, Inc. (the “Company” or “we”), effective as of the date set forth above (the “Effective Date”), to confirm the terms and conditions relating to your service as the interim Chief Exec

November 29, 2022 EX-10.2

Form of Retention Agreement, dated November 29, 2022

Exhibit 10.2 November 29, 2022 [●] Re: Retention Agreement Dear [●]: Your service to Solid Power, Inc. (collectively with its subsidiaries, the “Company”) is critical to the success of the Company. Because of your importance to the Company, the Company would like to provide you with a retention agreement that is intended to encourage your continued service to the Company. The terms of this Retenti

November 29, 2022 EX-99.1

Solid Power Announces CEO Transition

Exhibit 99.1 Solid Power Announces CEO Transition – Douglas Campbell to Retire as CEO – Company’s Chair and President David Jansen to Serve as Interim CEO LOUISVILLE, Colo., November 29, 2022 – Solid Power, Inc. (“Solid Power”) (Nasdaq: SLDP), an industry-leading developer of all-solid-state battery cells for electric vehicles, today announced that Douglas Campbell has decided to retire from his r

November 29, 2022 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 28, 2022 Solid Power, In

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 28, 2022 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Nu

November 21, 2022 EX-3.1

Amended and Restated Bylaws

Exhibit 3.1 AMENDED AND RESTATED BYLAWS OF SOLID POWER, INC. (effective November 16, 2022) TABLE OF CONTENTS Page ARTICLE I - CORPORATE OFFICES 1 1.1 REGISTERED OFFICE 1 1.2 OTHER OFFICES 1 ARTICLE II - MEETINGS OF STOCKHOLDERS 1 2.1 PLACE OF MEETINGS 1 2.2 ANNUAL MEETING 1 2.3 SPECIAL MEETING 1 2.4 ADVANCE NOTICE PROCEDURES 2 2.5 NOTICE OF STOCKHOLDERS’ MEETINGS 12 2.6 QUORUM 13 2.7 ADJOURNED MEE

November 21, 2022 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 16, 2022 Solid Power, In

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 16, 2022 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Nu

November 21, 2022 424B3

89,684,845 Shares of Common Stock 7,666,667 Warrants

PROSPECTUS SUPPLEMENT NO. 9 Filed Pursuant to Rule 424(b)(3) (To Prospectus dated April 5, 2022) Registration No. 333-261711 89,684,845 Shares of Common Stock 7,666,667 Warrants This prospectus supplement supplements the prospectus dated April 5, 2022 (as supplemented to date, the ?Prospectus?), which forms part of our Registration Statement on Form S-1 (No. 333-261711) for which Post-Effective Am

November 9, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

November 9, 2022 424B3

89,684,845 Shares of Common Stock 7,666,667 Warrants

PROSPECTUS SUPPLEMENT NO. 8 Filed Pursuant to Rule 424(b)(3) (To Prospectus dated April 5, 2022) Registration No. 333-261711 89,684,845 Shares of Common Stock 7,666,667 Warrants This prospectus supplement supplements the prospectus dated April 5, 2022 (as supplemented to date, the ?Prospectus?), which forms part of our Registration Statement on Form S-1 (No. 333-261711) for which Post-Effective Am

November 8, 2022 EX-99.1

SOLID POWER, INC. ANNOUNCES THIRD QUARTER 2022 FINANCIAL RESULTS

Exhibit 99.1 SOLID POWER, INC. ANNOUNCES THIRD QUARTER 2022 FINANCIAL RESULTS - Financial results and business update call scheduled for 5:00 p.m. ET today LOUISVILLE, Colo., November 8, 2022 – Solid Power, Inc. (Nasdaq: SLDP), an industry-leading developer of all-solid-state battery cells for electric vehicles, today announced its financial results for the third quarter ended September 30, 2022.

November 8, 2022 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 8, 2022 Solid Power, Inc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 8, 2022 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Num

September 1, 2022 SC 13D/A

SLDP / Solid Power Inc - Class A / Campbell Douglas M - SC 13D/A Activist Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A Under the Securities Exchange Act of 1934 (Amendment No. 4)* Solid Power, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 83422N 105 (CUSIP Number) Douglas Campbell 486 S. Pierce Ave., Suite E Louisville, CO (303) 219-0720 (Name, Address and Telephone Number of Person Authorized

August 29, 2022 SC 13D/A

SLDP / Solid Power Inc - Class A / Campbell Douglas M - SC 13D/A Activist Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A Under the Securities Exchange Act of 1934 (Amendment No. 3)* Solid Power, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 83422N 105 (CUSIP Number) Douglas Campbell 486 S. Pierce Ave., Suite E Louisville, CO (303) 219-0720 (Name, Address and Telephone Number of Person Authorized

August 12, 2022 8-K

Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 12, 2022 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Numb

August 10, 2022 424B3

89,684,845 Shares of Common Stock 7,666,667 Warrants

PROSPECTUS SUPPLEMENT NO. 7 Filed Pursuant to Rule 424(b)(3) (To Prospectus dated April 5, 2022) Registration No. 333-261711 89,684,845 Shares of Common Stock 7,666,667 Warrants This prospectus supplement supplements the prospectus dated April 5, 2022 (as supplemented to date, the ?Prospectus?), which forms part of our Registration Statement on Form S-1 (No. 333-261711) for which Post-Effective Am

August 10, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

August 9, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 9, 2022 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Numbe

August 9, 2022 EX-99.1

SOLID POWER, INC. ANNOUNCES SECOND QUARTER 2022 FINANCIAL RESULTS

Exhibit 99.1 SOLID POWER, INC. ANNOUNCES SECOND QUARTER 2022 FINANCIAL RESULTS - Financial results and business update call scheduled for 5:00 PM ET today LOUISVILLE, Colo., August 9, 2022 ? Solid Power, Inc. (Nasdaq: SLDP), an industry-leading developer of all-solid-state battery cells for electric vehicles, today announced its financial results for the second quarter ended June 30, 2022. Recent

July 18, 2022 424B3

89,684,845 Shares of Common Stock 7,666,667 Warrants

PROSPECTUS SUPPLEMENT NO. 6 Filed Pursuant to Rule 424(b)(3) (To Prospectus dated April 5, 2022) Registration No. 333-261711 89,684,845 Shares of Common Stock 7,666,667 Warrants This prospectus supplement supplements the prospectus dated April 5, 2022 (as supplemented to date, the ?Prospectus?), which forms part of our Registration Statement on Form S-1 (No. 333-261711) for which Post-Effective Am

July 18, 2022 EX-99.1

Solid Power Appoints Seasoned Automotive Industry Executive MaryAnn Wright to Board of Directors

Exhibit 99.1 Solid Power Appoints Seasoned Automotive Industry Executive MaryAnn Wright to Board of Directors ? Wright brings to the Solid Power board extensive experience in automotive industry as well as public company, leadership and energy storage expertise LOUISVILLE, Colo., July 18, 2022 ? Solid Power, Inc. ("Solid Power") (Nasdaq: SLDP), an industry-leading developer of all-solid-state batt

July 18, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 18, 2022 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Number

July 13, 2022 424B3

89,684,845 Shares of Common Stock 7,666,667 Warrants

PROSPECTUS SUPPLEMENT NO. 5 Filed Pursuant to Rule 424(b)(3) (To Prospectus dated April 5, 2022) Registration No. 333-261711 89,684,845 Shares of Common Stock 7,666,667 Warrants This prospectus supplement supplements the prospectus dated April 5, 2022 (as supplemented to date, the ?Prospectus?), which forms part of our Registration Statement on Form S-1 (No. 333-261711) for which Post-Effective Am

June 28, 2022 424B3

89,684,845 Shares of Common Stock 7,666,667 Warrants

PROSPECTUS SUPPLEMENT NO. 4 Filed Pursuant to Rule 424(b)(3) (To Prospectus dated April 5, 2022) Registration No. 333-261711 89,684,845 Shares of Common Stock 7,666,667 Warrants This prospectus supplement supplements the prospectus dated April 5, 2022 (as supplemented to date, the ?Prospectus?), which forms part of our Registration Statement on Form S-1 (No. 333-261711) for which Post-Effective Am

June 28, 2022 SC 13D/A

SLDP / Solid Power Inc - Class A / Campbell Douglas M - SC 13D/A Activist Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A Under the Securities Exchange Act of 1934 (Amendment No. 2)* Solid Power, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 83422N 105 (CUSIP Number) Douglas Campbell 486 S. Pierce Ave., Suite E Louisville, CO (303) 219-0720 (Name, Address and Telephone Number of Person Authorized

June 27, 2022 EX-99.1

The Road to a Solid - State - Powered Future: Automotive Qualification and the "A - Sample" Cell June 28, 2022

Exhibit 99.1 The Road to a Solid - State - Powered Future: Automotive Qualification and the "A - Sample" Cell June 28, 2022 Cautionary Note Regarding F o r w a rd ? L oo king S t a t e men ts This presentation (this ?Presentation?) includes ?forward - looking statements? within the meaning of Section 27A of the Securitie s Act of 1933, as amended, and Section 21E of the Securities Exchange Act of

June 27, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 27, 2022 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Number

May 26, 2022 424B3

89,684,845 Shares of Common Stock 7,666,667 Warrants

PROSPECTUS SUPPLEMENT NO. 3 Filed Pursuant to Rule 424(b)(3) (To Prospectus dated April 5, 2022) Registration No. 333-261711 89,684,845 Shares of Common Stock 7,666,667 Warrants This prospectus supplement supplements the prospectus dated April 5, 2022 (as supplemented to date, the ?Prospectus?), which forms part of our Registration Statement on Form S-1 (No. 333-261711) for which Post-Effective Am

May 26, 2022 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 25, 2022 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Number)

May 11, 2022 424B3

89,684,845 Shares of Common Stock 7,666,667 Warrants

Table of Contents ? ? PROSPECTUS SUPPLEMENT NO. 2 Filed Pursuant to Rule 424(b)(3) (To Prospectus dated April 5, 2022) Registration No. 333-261711 ? 89,684,845 Shares of Common Stock 7,666,667 Warrants ? ? This prospectus supplement supplements the prospectus dated April 5, 2022 (as supplemented to date, the ?Prospectus?), which forms part of our Registration Statement on Post-Effective Amendment

May 11, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

May 10, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 10, 2022 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Number)

May 10, 2022 EX-99.1

SOLID POWER, INC. ANNOUNCES FIRST QUARTER 2022 FINANCIAL RESULTS

Exhibit 99.1 SOLID POWER, INC. ANNOUNCES FIRST QUARTER 2022 FINANCIAL RESULTS - Financial results and business update call scheduled for 5:00 PM ET today - Reaffirms 2022 milestones and outlook LOUISVILLE, Colo., May 10, 2022 ? Solid Power, Inc. (Nasdaq: SLDP), an industry-leading developer of all-solid-state battery cells for electric vehicles, today announced its financial results for the first

May 6, 2022 424B3

89,684,845 Shares of Common Stock 7,666,667 Warrants

Filed Pursuant to Rule 424(b)(3) Registration No. 333-261711 PROSPECTUS SUPPLEMENT NO. 1 (To Prospectus dated April 5, 2022) 89,684,845 Shares of Common Stock 7,666,667 Warrants This prospectus supplement supplements the prospectus dated April 5, 2022 (the ?Prospectus?), which forms part of our Registration Statement on Form S-1 (No. 333-261711) for which Post-Effective Amendment No. 1 was filed w

April 6, 2022 424B3

89,684,845 Shares of Common Stock 7,666,667 Warrants

TABLE OF CONTENTS PROSPECTUS?Filed Pursuant to Rule 424(b)(3) ?Registration No. 333-261711? 89,684,845 Shares of Common Stock 7,666,667 Warrants ? This prospectus relates to the registration of the Common Stock, par value $0.0001 per share (the ?Common Stock?), of Solid Power, Inc. (f/k/a Decarbonization Plus Acquisition Corporation III, ?Solid Power,? the ?Company,? ?we,? ?us? or ?our?) and warra

April 1, 2022 EX-24.2

Power of Attorney

Exhibit 24.2 POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below hereby constitutes and appoints Douglas Campbell, David B. Jansen, Kevin Paprzycki and James Liebscher, and each of them, as his or her true and lawful attorney-in-fact and agent with full power of substitution, for him or her in any and all capacities, to sign any and all amendments t

April 1, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.     )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ????) Filed by the Registrant??x Filed by a Party other than the Registrant??? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ?

April 1, 2022 POS AM

As filed with the Securities and Exchange Commission on April 1, 2022

As filed with the Securities and Exchange Commission on April 1, 2022 Registration No.

April 1, 2022 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.      )

DEF 14A 1 tm2210244-1def14a.htm DEF 14A TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.      ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Pr

March 23, 2022 EX-10.24

Offer Letter with Jon Jacobs, dated September 26, 2021

Exhibit 10.24 ? September 26, 2021 ? Jon Jacobs [***] ? Subject: Offer of Employment ? Dear Jon, It is with great pleasure that I offer you a full-time employment position at Solid Power, Inc. ("Company") under the exempt position of Chief Marketing Officer reporting to Doug Campbell, Chief Executive Officer. Your start date is expected to be October 18, 2021, subject to standard corporate approva

March 23, 2022 EX-4.6

Description of Securities

Exhibit 4.6 DESCRIPTION OF SECURITIES The following summary of the material terms of our securities and certain provisions in our second amended and restated certificate of incorporation (the ?Second A&R Charter?) and amended and restated bylaws (the ?Bylaws?) as currently in effect. Because the following description is only a summary, it does not contain all of the information and is qualified in

March 23, 2022 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents ? ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

March 23, 2022 EX-10.25

Executive Change in Control and Severance Plan Participation Agreement with Jon Jacobs, dated December 21, 2021

? Exhibit 10.25 Solid Power, Inc. Executive Change in Control and Severance Plan Participation Agreement Solid Power, Inc. (the ?Company?) is pleased to inform you, the undersigned that you have been selected to participate in the Company?s Executive Change in Control and Severance Plan (the ?Plan?) as a Participant. A copy of the Plan was delivered to you with this Participation Agreement. Your p

March 22, 2022 EX-99.1

Solid Power, Inc. Announces Full Year 2021 Financial Results Financial results and business update call scheduled for 5:00 PM ET today

Exhibit 99.1 Solid Power, Inc. Announces Full Year 2021 Financial Results Financial results and business update call scheduled for 5:00 PM ET today LOUISVILLE, Colo., March 22, 2022 ? Solid Power, Inc. (Nasdaq: SLDP), an industry-leading developer of all-solid-state battery cells for electric vehicles, today announced its financial results for the full year ended December 31, 2021. Recent business

March 22, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 22, 2022 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Numbe

March 21, 2022 424B3

89,684,876 Shares of Common Stock 7,666,667 Warrants

Filed Pursuant to Rule 424(b)(3) Registration No. 333-261711 PROSPECTUS SUPPLEMENT NO. 3 (To Prospectus dated December 28, 2021) 89,684,876 Shares of Common Stock 7,666,667 Warrants This prospectus supplement supplements the prospectus dated December 28, 2021 (as supplemented to date, the ?Prospectus?), which forms part of our Registration Statement on Form S-1 (No. 333-261711) filed with the Secu

March 21, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 17, 2022 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Numbe

February 15, 2022 EX-24

POWER OF ATTORNEY

Exhibit 24 POWER OF ATTORNEY Know all by these presents, that the undersigned hereby constitutes and appoints Peter Haskopoulos of Decarbonization Plus Acquisition Sponsor III LLC (the ?Company?), as the undersigned?s true and lawful attorney-in-fact to: 1.

February 15, 2022 EX-99

JOINT FILING AGREEMENT

Exhibit 99 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with each other on behalf of each of them of such a statement on Schedule 13G and any amendment thereto with respect to the common stock beneficially owned by each of them of Solid Power, Inc.

February 15, 2022 SC 13G

SLDP / Solid Power Inc - Class A / Decarbonization Plus Acquisition Sponsor III LLC - SC 13G Passive Investment

SC 13G SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Rule 13d-102) Information to be Included in Statements Filed Pursuant to § 240.13d-1(b), (c) and (d) and Amendments Thereto Filed Pursuant to § 240.13d-2 Under the Securities Exchange Act of 1934 (Amendment No. )* SOLID POWER, INC. (Name of Issuer) Common Stock (Title of Class of Securities) 83422N105 (CUSIP Number) Dec

February 14, 2022 EX-99.6

Form of Notice of Restricted Stock Unit Grant (Employee) under 2021 Equity Incentive Plan

Exhibit 99.6 SOLID POWER, INC. 2021 EQUITY INCENTIVE PLAN RESTRICTED STOCK UNIT AGREEMENT NOTICE OF RESTRICTED STOCK UNIT GRANT Unless otherwise defined herein, the terms defined in the Solid Power, Inc. 2021 Equity Incentive Plan (the ?Plan?) will have the same defined meanings in this Restricted Stock Unit Agreement which includes this Notice of Restricted Stock Unit Grant (this ?Notice of Grant

February 14, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 10, 2022 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Nu

February 14, 2022 EX-99.1

Press Release, dated February 14, 2022.

Exhibit 99.1 Solid Power Appoints Former Cooper-Standard Holdings SVP, Chief Transformation Officer and General Counsel, Aleksandra Miziolek to Board of Directors ? Miziolek strengthens Solid Power?s board by adding extensive experience in the automotive industry and expertise in strategic growth initiatives, executive leadership and corporate governance LOUISVILLE, Colo., February 14, 2022 ? Soli

February 14, 2022 EX-99.7

Form of Notice of Restricted Stock Unit Grant (New Director) under 2021 Equity Incentive Plan

Exhibit 99.7 SOLID POWER, INC. 2021 EQUITY INCENTIVE PLAN RESTRICTED STOCK UNIT AGREEMENT NOTICE OF RESTRICTED STOCK UNIT GRANT NEW DIRECTOR Unless otherwise defined herein, the terms defined in the Solid Power, Inc. 2021 Equity Incentive Plan (the ?Plan?) will have the same defined meanings in this Restricted Stock Unit Agreement which includes this Notice of Restricted Stock Unit Grant (this ?No

February 14, 2022 EX-99.1

Solid Power, Inc. 2014 Equity Incentive Plan

? Exhibit 99.1 ? * * * * * * * * ? Solid Power,?Inc. ? 2014 Equity Incentive Plan ? Adopted by the Board of Directors: March?7, 2014 Approved by the Stockholders: March?7, 2014 Amended: April?7, 2015, February?1, 2017, February?20, 2019, and August?3, 2021 Termination Date: March?7, 2024 ? 1.????????????General. ? (a)?????????????Eligible Stock Award Recipients. The persons eligible to receive Sto

February 14, 2022 EX-99.5

Form of Notice of Stock Option Grant under 2021 Equity Incentive Plan

Exhibit 99.5 SOLID POWER, INC. 2021 EQUITY INCENTIVE PLAN STOCK OPTION AGREEMENT NOTICE OF STOCK OPTION GRANT Unless otherwise defined herein, the terms defined in the Solid Power, Inc. 2021 Equity Incentive Plan (the ?Plan?) shall have the same defined meanings in this Stock Option Agreement, which includes the Notice of Stock Option Grant (the ?Notice of Grant?), the Terms and Conditions of Stoc

February 14, 2022 EX-99.4

Form of Stock Option Grant Notice under 2014 Equity Incentive Plan

Exhibit 99.4 Solid Power, Inc. Stock Option Grant Notice (2014 Equity Incentive Plan) Grant No. Solid Power, Inc. (the ?Company?), pursuant to its 2014 Equity Incentive Plan (the ?Plan?), hereby grants to Optionholder an option to purchase the number of shares of the Company?s Common Stock set forth below. This option is subject to all of the terms and conditions as set forth herein and in the Opt

February 14, 2022 EX-FILING FEES

Fee Table

Exhibit 107 Calculation of Filing Fee Tables Form S-8 (Form Type) Solid Power, Inc.

February 14, 2022 S-8

As filed with the Securities and Exchange Commission on February 14, 2022

? As filed with the Securities and Exchange Commission on February?14, 2022 ? Registration No.

February 14, 2022 EX-99.1

Solid Power Appoints Former Cooper-Standard Holdings SVP, Chief Transformation Officer and General Counsel, Aleksandra Miziolek to Board of Directors

Exhibit 99.1 Solid Power Appoints Former Cooper-Standard Holdings SVP, Chief Transformation Officer and General Counsel, Aleksandra Miziolek to Board of Directors ? Miziolek strengthens Solid Power?s board by adding extensive experience in the automotive industry and expertise in strategic growth initiatives, executive leadership and corporate governance LOUISVILLE, Colo., February 14, 2022 ? Soli

February 14, 2022 EX-99.8

Form of Notice of Restricted Stock Unit Grant (Annual Award) under 2021 Equity Incentive Plan

Exhibit 99.8 SOLID POWER, INC. 2021 EQUITY INCENTIVE PLAN RESTRICTED STOCK UNIT AGREEMENT NOTICE OF RESTRICTED STOCK UNIT GRANT ANNUAL DIRECTOR AWARD Unless otherwise defined herein, the terms defined in the Solid Power, Inc. 2021 Equity Incentive Plan (the ?Plan?) will have the same defined meanings in this Restricted Stock Unit Agreement which includes this Notice of Restricted Stock Unit Grant

February 14, 2022 424B3

89,684,876 Shares of Common Stock 7,666,667 Warrants

Filed Pursuant to Rule 424(b)(3) Registration No. 333-261711 PROSPECTUS SUPPLEMENT NO. 2 (To Prospectus dated December 28, 2021) 89,684,876 Shares of Common Stock 7,666,667 Warrants This prospectus supplement supplements the prospectus dated December 28, 2021 (as supplemented to date, the ?Prospectus?), which forms part of our Registration Statement on Form S-1 (No. 333-261711) filed with the Secu

February 14, 2022 EX-99.3

Solid Power, Inc. 2021 Employee Stock Purchase Plan

? Exhibit 99.3 ? SOLID POWER, inc. ? 2021 EMPLOYEE STOCK PURCHASE PLAN ? 1.????????????Purpose. The purpose of the Plan is to provide employees of the Company and its Designated Companies with an opportunity to purchase Common Stock through accumulated Contributions. The Company intends for the Plan to have two components: a component that is intended to qualify as an ?employee stock purchase plan

February 11, 2022 SC 13G/A

SLDP / Solid Power Inc - Class A / INTEGRATED CORE STRATEGIES (US) LLC Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (AMENDMENT NO. 1) SOLID POWER, INC. (formerly Decarbonization Plus Acquisition Corporation III) (Name of Issuer) COMMON STOCK, PAR VALUE $0.0001 PER SHARE (Title of Class of Securities) 83422N105 (CUSIP Number) DECEMBER 31, 2021 (Date of event which requires filing of this

February 11, 2022 SC 13G/A

SLDP / Solid Power Inc - Class A / FARALLON CAPITAL MANAGEMENT LLC - AMENDMENT #2 Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No.

January 18, 2022 EX-99.1

Solid Power Appoints Former Senior NASA Executive Lesa Roe to Board of Directors

Exhibit 99.1 Solid Power Appoints Former Senior NASA Executive Lesa Roe to Board of Directors ? Roe strengthens Solid Power?s board by adding extensive executive leadership, strategy, and operational oversight expertise LOUISVILLE, Colo., January 18, 2022 ? Solid Power, Inc. ("Solid Power") (Nasdaq: SLDP), an industry-leading developer of all-solid-state battery cells for electric vehicles, today

January 18, 2022 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): January 17, 2022 Solid Power, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-40284 86-1888095 (State or other jurisdiction of incorporation) (Commission File Num

January 18, 2022 424B3

89,684,876 Shares of Common Stock 7,666,667 Warrants

Filed Pursuant to Rule 424(b)(3) Registration No. 333-261711 PROSPECTUS SUPPLEMENT NO. 1 (To Prospectus dated December 28, 2021) 89,684,876 Shares of Common Stock 7,666,667 Warrants This prospectus supplement supplements the prospectus dated December 28, 2021 (the ?Prospectus?), which forms part of our Registration Statement on Form S-1 (No. 333-261711) filed with the Securities and Exchange Commi

January 13, 2022 SC 13D/A

SLDP / Solid Power Inc - Class A / Campbell Douglas M - SC 13D/A Activist Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A Under the Securities Exchange Act of 1934 (Amendment No. 1)* Solid Power, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 83422N 105 (CUSIP Number) Douglas Campbell 486 S. Pierce Ave., Suite E Louisville, CO (303) 219-0720 (Name, Address and Telephone Number of Person Authorized

December 28, 2021 424B3

89,684,876 Shares of Common Stock 7,666,667 Warrants

TABLE OF CONTENTS ?Filed Pursuant to Rule 424(b)(3)? ?Registration No. 333-261711? PROSPECTUS 89,684,876 Shares of Common Stock 7,666,667 Warrants ? This prospectus relates to the registration of the Common Stock, par value $0.0001 per share, of Solid Power, Inc. (the ?Common Stock?) and warrants to purchase shares of Common Stock as described herein. This prospectus relates to the offer by us, an

December 23, 2021 LETTER

LETTER

United States securities and exchange commission logo December 23, 2021 James Liebscher Chief Legal Officer Solid Power, Inc.

December 23, 2021 CORRESP

December 23, 2021

December 23, 2021 VIA EDGAR U.S. Securities and Exchange Commission Division of Corporation Finance Office of Manufacturing 100 F Street, N.E. Washington, D.C. 20549-3720 Attention: Patrick Fullem Re: Solid Power, Inc. Registration Statement on Form S-1 (File No. 333-261711) Acceleration Request Requested Date: Tuesday, December 28, 2021 Requested Time: 4:30 P.M. Eastern Standard Time Ladies and G

December 23, 2021 CORRESP

December 23, 2021

December 23, 2021 VIA EDGAR U.S. Securities and Exchange Commission Division of Corporation Finance Office of Manufacturing 100 F Street, N.E. Washington, D.C. 20549-3720 Attention: Patrick Fullem Re: Solid Power, Inc. Registration Statement on Form S-1 (File No. 333-261711) Acceleration Request Requested Date: Tuesday, December 28, 2021 Requested Time: 4:30 P.M. Eastern Standard Time Ladies and G

December 20, 2021 SC 13D

SLDP / Solid Power Inc - Class A / BMW Holding B.V. Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. )* Solid Power, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 83422N105 (CUSIP Number) Stefan Hienzsch Assistant General Counsel BMW GROUP BMW Rechtsabteilung, AJ-3 Petuelring 130 80788 M?nchen, Germany Tel. N

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