| Investor | Value | Of portfolio | Shares | Change | Quarter |
|---|---|---|---|---|---|
| Renaissance Technologies | $19.5M | 0.03% | 1.41M | +292% | Q2 2026 |
From each investor's quarterly 13F filing with the SEC: positions at the quarter's end, reported up to 45 days later. All investors
No member of Congress has disclosed a AMPX trade since 2025.
From House and Senate STOCK Act reports. Members disclose trades, not holdings, as value ranges up to 45 days later, so amounts are estimates and “last move” is a hint at who still holds it, not a position. All recent congress trades
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 57.7 | -13.7 | 57.1 | 24.9 | -3.7 | -31.7 | -30.7 | 2.9 | -2.0 | -11.2 | +8.9% | ||
| 2025 | 18.9 | -23.4 | 5.1 | -19.4 | 24.5 | 56.5 | 64.6 | 2.3 | 48.4 | 33.9 | -19.7 | -30.3 | +181.8% |
| 2024 | -22.7 | -20.5 | -18.5 | -29.4 | -25.7 | -8.6 | -5.5 | -10.8 | 3.7 | 21.6 | 58.5 | 30.8 | −47.1% |
| 2023 | -18.0 | -2.6 | 37.6 | 7.7 | -18.9 | -5.7 | 4.6 | -34.5 | -3.7 | -38.6 | 41.2 | 28.7 | −33.3% |
| 2022 | 24.8 | -10.9 | -22.7 | −14.0% |
| Date | Insider | Transaction | Shares | Value |
|---|---|---|---|---|
| Aug 24, 2026 | Stepien Thomas MChief Executive Officer | Stock Award(Grant) at price 0.00 per share. | 346 | — |
| Aug 24, 2026 | Stepien Thomas MChief Executive Officer | Stock Gift at price 0.00 per share. | 15.3K | — |
| Aug 23, 2026 | Stepien Thomas MChief Executive Officer | Sale at price 10.03 - 10.34 per share. | 31.5K | $323.55K |
| Aug 20, 2026 | Sun KangDirector | Sale at price 10.34 per share. | 62.1K | $642.19K |
| Aug 20, 2026 | Stefan Constantin IonelChief Technology Officer | Sale at price 10.34 per share. | 29.7K | $306.93K |
| Jun 14, 2026 | Dixon Donald R.Director | Sale at price 17.17 per share. | 85K | $1.46M |
| Jun 11, 2026 | Bayless Kathleen Ann Cpa.,Director | Stock Award(Grant) at price 0.00 per share. | 10.4K | — |
| Jun 11, 2026 | Chu StevenDirector | Stock Award(Grant) at price 0.00 per share. | 10.4K | — |
| Jun 11, 2026 | Satterthwaite Livingston LordDirector | Stock Award(Grant) at price 0.00 per share. | 10.4K | — |
| Jun 11, 2026 | Dixon Donald R.Director | Stock Award(Grant) at price 0.00 per share. | 10.4K | — |
| Jun 8, 2026 | Dixon Donald R.Director | Sale at price 19.13 per share. | 40K | $765.20K |
| Jun 3, 2026 | Stepien Thomas MChief Executive Officer | Stock Gift at price 0.00 per share. | 67.3K | — |
| Jun 3, 2026 | Stepien Thomas MChief Executive Officer | Sale at price 20.97 per share. | 2K | $41.94K |
| May 26, 2026 | Sun KangDirector | Sale at price 17.19 per share. | 356 | $6.12K |
| May 26, 2026 | Stefan Constantin IonelChief Technology Officer | Sale at price 17.19 per share. | 3.2K | $55.16K |
| May 26, 2026 | Stepien Thomas MChief Executive Officer | Sale at price 17.19 per share. | 4.4K | $75.22K |
| May 25, 2026 | Dixon Donald R.Director | Sale at price 17.90 per share. | 17.9K | $320.25K |
| May 20, 2026 | Sun KangDirector | Sale at price 14.79 per share. | 67.8K | $1.00M |
| May 20, 2026 | Stefan Constantin IonelChief Technology Officer | Sale at price 14.79 per share. | 28.8K | $426.08K |
| May 20, 2026 | Stepien Thomas MChief Executive Officer | Sale at price 14.79 per share. | 60.7K | $897.68K |
Amprius Technologies, Inc. develops, manufactures, and markets lithium-ion batteries for mobility applications. The company provides silicon anode lithium-ion batteries under the SiCore and SiMaxx product platforms. Its batteries are primarily used for existing and emerging aviation applications, including unmanned aerial systems, such as drones and high-altitude pseudo satellites. The company was founded in 2008 and is headquartered in Fremont, California.
Buy / hold / sell counts