Amprius TechnologiesAMPX.WSPreferred / convertible
13F holders, Q1 2026 (March 31)13holders −1
3new positions
4sold out
1famous investor
$7.36avg. 13F price*
At the end of Q1 2026, 13 institutions reported holding Amprius Technologies Inc. (AMPX.WS) in their 13F filings, down 1 from Q4 2025. 3 opened new positions and 4 sold out. The largest holders were LMR Partners LLP ($30.8M), Aristeia Capital, L.L.C. ($8.3M) and Boothbay Fund Management, LLC ($7.9M). 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 Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 3 | $7.9M |
| Exits | 4 | $2.1M |
All 13F filers, Q4 2025 → Q1 2026: 2,099,512 shares bought and 1,144,132 shares sold, net +955,380 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 13 holders
| LMR Partners LLP | — | Add +3.5% | 4,489,842 | $30.8M |
| Aristeia Capital, L.L.C. | — | Add +34.7% | 1,215,397 | $8.3M |
| Boothbay Fund Management, LLC | — | No change | 470,000 | $7.9M |
| Caption Management, LLC | — | Add +58.8% | 1,084,367 | $7.4M |
| CSS LLC | — | New | 754,893 | $5.2M |
| Hudson Bay Capital Management LP | — | Add +9.7% | 741,715 | $5.1M |
| DRW Securities, LLC | — | New | 335,173 | $2.3M |
| Wolverine Asset Management LLC | — | Reduce -1.5% | 213,225 | $1.5M |
| Janney Montgomery Scott LLC | — | Reduce -33.7% | 158,305 | $1.1M |
| Zazove Associates LLC | — | Add +24.6% | 77,096 | $530K |
| Warberg Asset Management LLC | — | New | 63,200 | $434K |
| D. E. Shaw & Co. | — | Reduce -89.0% | 29,500 | $203K |
| Farther Finance Advisors, LLC | — | No change | 2 | $12 |
"% of holder's portfolio" is AMPX.WS's weight in each manager's 13F, not the share of Amprius Technologies Inc. the manager owns.