Amprius TechnologiesAMPX.WSPreferred / convertible
13F holders, Q4 2025 (December 31)14holders −4
1new positions
5sold out
1famous investor
$2.86avg. 13F price*
At the end of Q4 2025, 14 institutions reported holding Amprius Technologies Inc. (AMPX.WS) in their 13F filings, down 4 from Q3 2025. 1 opened new positions and 5 sold out. The largest holders were LMR Partners LLP ($11.2M), Boothbay Fund Management, LLC ($3.7M) and Aristeia Capital, L.L.C. ($2.3M). One famous investor held it David E. Shaw ( of D. E. Shaw & Co.'s portfolio).
- Company
- Amprius Technologies Inc.
- CUSIP
- 03214Q116
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q3 2025 → Q4 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 1 | $160K |
| Exits | 5 | $1.2M |
All 13F filers, Q3 2025 → Q4 2025: 992,431 shares bought and 424,045 shares sold, net +568,386 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 14 holders
| LMR Partners LLP | — | Add +0.6% | 4,338,773 | $11.2M |
| Boothbay Fund Management, LLC | — | Add +141.6% | 470,000 | $3.7M |
| Aristeia Capital, L.L.C. | — | Reduce -6.0% | 902,388 | $2.3M |
| Caption Management, LLC | — | No change | 682,810 | $1.8M |
| Hudson Bay Capital Management LP | — | Add +20.0% | 676,309 | $1.7M |
| Fort Baker Capital Management LP | — | Add +199.6% | 414,139 | $1.1M |
| Toronto Dominion Bank | — | Add +161.0% | 377,208 | $969K |
| D. E. Shaw & Co. | — | No change | 267,000 | $686K |
| Janney Montgomery Scott LLC | — | Reduce -14.6% | 238,903 | $614K |
| Wolverine Asset Management LLC | — | Add +3.5% | 216,412 | $556K |
| Zazove Associates LLC | — | New | 61,891 | $160K |
| Stifel Financial Corp. | — | Reduce -34.9% | 21,500 | $55K |
| Cetera Investment Advisers | — | No change | 10,000 | $26K |
| Farther Finance Advisors, LLC | — | No change | 2 | $5 |
"% of holder's portfolio" is AMPX.WS's weight in each manager's 13F, not the share of Amprius Technologies Inc. the manager owns.