Amprius Technologies, Inc. (AMPX) Stock
6 of the hedge funds AlphaScala tracks reported AMPX in 13F filings for the quarter ended Jun 30, 2026; the largest reported position is Citadel's at $23.23M. Company insiders reported 0 open-market buys and 4 sales on SEC Form 4 in the 90 days to Nov 3, 2026.
Which hedge funds own AMPX?
From 13F filings| Fund | Shares Held | Position Value | Change vs prior Q |
|---|---|---|---|
| Citadel Ken Griffin | 1.68M | $23.23M | +17% |
| Renaissance Technologies Jim Simons (founder) | 1.41M | $19.53M | +292% |
| Millennium Management Israel Englander | 1.21M | $16.74M | +17% |
| Point72 Steve Cohen | 1.14M | $15.80M | +3982% |
| D.E. Shaw David Shaw | 672K | $9.31M | -38% |
| Marshall Wace | 131K | $1.82M | -89% |
13F holdings as of Jun 30, 2026
Explore all tracked funds →Are Amprius Technologies, Inc. insiders buying or selling?
SEC Form 4 filings| Date | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| Aug 24, 26 | Stepien Thomas M | Chief Executive Officer | SELL | 8.0K | $80K |
| Aug 21, 26 | Sun Kang | Director | SELL | 62.1K | $642K |
| Aug 21, 26 | Stefan Constantin Ionel | Chief Technology Officer | SELL | 29.7K | $307K |
| Aug 21, 26 | Stepien Thomas M | Chief Executive Officer | SELL | 23.5K | $243K |
SEC Form 4 filings as of Nov 3, 2026
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Powered by TradingViewWhat does Amprius Technologies, Inc. do?
Amprius Technologies manufactures advanced silicon anode lithium-ion batteries that deliver high energy and power density for mobility applications. The company produces batteries under its SiCore and SiMaxx product platforms, designed primarily for aviation sectors including unmanned aerial systems, drones, and high-altitude pseudo satellites. Amprius also serves emerging markets in electric vehicles and light electric vehicles, positioning itself as a leader in next-generation battery technology. Founded in 2008 and headquartered in Fremont, California, the company maintains research and development facilities along with pilot manufacturing operations for silicon anode fabrication. Amprius has established strategic manufacturing partnerships globally to scale production capacity and serves diverse customers across defense, commercial, and aerospace segments. The company's silicon anode technology represents a significant advancement in battery performance, enabling longer flight times and improved operational reliability for demanding applications.