Amprius Technologies
AMPX
205 hedge funds and large institutions have $534M invested in Amprius Technologies in 2025 Q4 according to their latest regulatory filings, with 49 funds opening new positions, 85 increasing their positions, 53 reducing their positions, and 29 closing their positions.
184% more call options, than puts
Call options by funds: $56.2M | Put options by funds: $19.8M
69% more first-time investments, than exits
New positions opened: 49 | Existing positions closed: 29
60% more repeat investments, than reductions
Existing positions increased: 85 | Existing positions reduced: 53
10% more funds holding
Funds holding: 187 → 205 (+18)
1.02% more ownership
Funds ownership: 50.86% → 51.89% (+1%)
0% more funds holding in top 10
Funds holding in top 10: 1 → 1 (0)
20% less capital invested
Capital invested by funds: $669M → $534M (-$135M)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
BlackRock
New York
|
+$15.6M |
| 2 |
Hudson Bay Capital Management
Stamford,
Connecticut
|
+$12.6M |
| 3 |
William Blair Investment Management
Chicago,
Illinois
|
+$11.3M |
| 4 |
Qube Research & Technologies (QRT)
London,
United Kingdom
|
+$9.99M |
| 5 |
HRCM
Hood River Capital Management
Palm Beach Gardens,
Florida
|
+$9.26M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Citadel Advisors
Miami,
Florida
|
-$23.5M |
| 2 |
BNP Paribas Financial Markets
Paris,
France
|
-$14.1M |
| 3 |
Invesco
Atlanta,
Georgia
|
-$12.2M |
| 4 |
DCM
Driehaus Capital Management
Chicago,
Illinois
|
-$7.97M |
| 5 |
Tudor Investment Corp
Stamford,
Connecticut
|
-$7.53M |
AMPX Hedge Fund Activity: Q4 2025 in Review
205 of the 8,270 institutional investors tracked by Wall St. Rank reported a position in Amprius Technologies (AMPX) for Q4 2025, worth a combined $534M — down 20% from $669M a quarter earlier.
Buyers outnumbered sellers: 49 funds opened new AMPX positions and 29 closed out — a net gain of 20 holders — while 85 added to existing stakes and 53 trimmed.
The largest buyer was BlackRock, adding an estimated $15.6M. The largest seller was Citadel Advisors, cutting an estimated $23.5M.
- 205 institutional investors held Amprius Technologies (AMPX) as of Q4 2025, up from 187 in Q3 2025.
- Funds reported $534M of Amprius Technologies stock for Q4 2025, down 20% quarter-over-quarter.
- 49 funds opened new Amprius Technologies positions in Q4 2025 and 29 closed out, a net change of +20 holders.
- The largest Amprius Technologies buyer in Q4 2025 was BlackRock, an estimated $15.6M added.
- The largest Amprius Technologies seller in Q4 2025 was Citadel Advisors, an estimated $23.5M sold.
Based on aggregated 13F filings for Q4 2025.