메이빌 엔지니어링 컴퍼니, Inc.
US ˙ NYSE ˙ US5786051079

SecurityMEC / Mayville Engineering Company, Inc.
InstitutionMillennium Management Llc
ManagerIsrael Englander
Latest Disclosed Ownership380,972 shares
Latest Disclosed Value $ 6,838,447
Millennium Management Llc reports 148.68% increase in ownership of MEC / Mayville Engineering Company, Inc.

On May 15, 2026 - Millennium Management Llc filed a 13F-HR form disclosing ownership of 380,972 shares of Mayville Engineering Company, Inc. (US:MEC) valued at $6,838,447 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 153,200 shares of Mayville Engineering Company, Inc.. This represents a change in shares of 148.68% during the quarter. The current value of the position is $12,667,319 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F MAYVILLE ENGR COM 578605107 380,972 227,772 148.68 6,838 138.51 0.0028
2026-02-17 2025-12-31 13F MAYVILLE ENGR COM 578605107 153,200 153,200 2,868 0.0012
2025-08-14 2025-06-30 13F MAYVILLE ENGR COM 578605107 0 -112,350 -100.00 0 -100.00
2025-05-15 2025-03-31 13F MAYVILLE ENGR COM 578605107 112,350 82,006 270.25 1,509 216.14 0.0008
2025-02-14 2024-12-31 13F MAYVILLE ENGR COM 578605107 30,344 30,344 477 0.0002
2024-05-15 2024-03-31 13F MAYVILLE ENGR COM 578605107 0 -14,171 -100.00 0 -100.00
2024-02-14 2023-12-31 13F MAYVILLE ENGR COM 578605107 14,171 -1,176 -7.66 204 21.43 0.0001
2023-11-14 2023-09-30 13F MAYVILLE ENGR COM 578605107 15,347 715 4.89 168 -7.69 0.0001
2023-08-14 2023-06-30 13F MAYVILLE ENGR COM 578605107 14,632 -96,372 -86.82 182 -89.01 0.0001
2023-05-15 2023-03-31 13F MAYVILLE ENGR COM 578605107 111,004 23,880 27.41 1,656 50.14 0.0009
2023-02-14 2022-12-31 13F MAYVILLE ENGR COM 578605107 87,124 -106,464 -55.00 1,103 -12.46 0.0006
2022-11-14 2022-09-30 13F MAYVILLE ENGR COM 578605107 193,588 -33,253 -14.66 1,260 -28.25 0.0007
2022-08-15 2022-06-30 13F MAYVILLE ENGR COM 578605107 226,841 178,084 365.25 1,756 284.25 0.0011
2022-05-16 2022-03-31 13F MAYVILLE ENGR COM 578605107 48,757 28,329 138.68 457 49.84 0.0002
2022-02-14 2021-12-31 13F MAYVILLE ENGR COM 578605107 20,428 20,428 305 0.0002
2020-02-14 2019-12-31 13F MAYVILLE ENGINEERING COM 578605107 0 -20,392 -100.00 0 -100.00
2019-11-14 2019-09-30 13F MAYVILLE ENGINEERING COM 578605107 20,392 -67,505 -76.80 268 -77.91 0.0004
2019-08-15 2019-06-30 13F/A-1 MAYVILLE ENGINEERING COM 578605107 87,897 87,897 1,213 0.0018
2019-08-14 2019-06-30 13F MAYVILLE ENGINEERING COM 578605107 87,897 1,213
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.