암프리우스 테크놀로지스, Inc.
US ˙ NYSE ˙ US03214Q1085

SecurityAMPX / Amprius Technologies, Inc.
InstitutionJanus Henderson Group Plc
Latest Disclosed Ownership52,803 shares
Latest Disclosed Value $ 889,467
Janus Henderson Group Plc reports 35.21% increase in ownership of AMPX / Amprius Technologies, Inc.

On May 18, 2026 - Janus Henderson Group Plc filed a 13F-HR/A form disclosing ownership of 52,803 shares of Amprius Technologies, Inc. (US:AMPX) valued at $890,259 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 39,053 shares of Amprius Technologies, Inc.. This represents a change in shares of 35.21% during the quarter. The current value of the position is $1,039,691 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-18 2026-03-31 13F/A-1 AMPRIUS TECHNOLOGIES COMMON STOCK 03214Q108 52,803 13,750 35.21 889 189.58 0.0001
2026-05-15 2026-03-31 13F AMPRIUS TECHNOLOGIES COMMON STOCK 03214Q108 52,803 13,750 35.21 889 189.58 0.0002
2026-02-17 2025-12-31 13F AMPRIUS TECHNOLOGIES COMMON STOCK 03214Q108 39,053 0 0.00 308 -25.30 0.0001
2025-11-14 2025-09-30 13F AMPRIUS TECHNOLOGIES COMMON STOCK 03214Q108 39,053 39,053 411 0.0002
2023-11-14 2023-09-30 13F AMPRIUS TECHNOLOGIES COMMON STOCK 03214Q108 0 -642,453 -100.00 0 -100.00
2023-08-14 2023-06-30 13F AMPRIUS TECHNOLOGIES COMMON STOCK 03214Q108 642,453 -382,127 -37.30 4,613 -48.32 0.0029
2023-05-15 2023-03-31 13F AMPRIUS TECHNOLOGIES COMMON STOCK 03214Q108 1,024,580 -4,847 -0.47 8,924 9.32 0.0059
2023-02-14 2022-12-31 13F AMPRIUS TECHNOLOGIES COMMON STOCK 03214Q108 1,029,427 13,098 1.29 8,163 -12.93 0.0058
2023-01-13 2022-09-30 13F/A-1 AMPRIUS TECHNOLOGIES COMMON STOCK 03214Q108 1,016,329 1,016,329 9,375 0.0070
2022-11-14 2022-09-30 13F AMPRIUS TECHNOLOGIES COMMON STOCK 03214Q108 1,016,329 1,016,329 9,375 0.0070
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.