Amprius Technologies
Makes silicon-anode batteries for drones, aviation, defense, and light electric mobility.
$9.93
After-hours close+0.05 (+0.51%)
At close$9.88(−5.99%)
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Breakdown13F · Form 4
Institutions 70.76%100.22M sharesInsiders 4.85%6.87M sharesOther 24.39%34.55M shares
Shares outstanding 141.63M · Float 131.61M · 92.9% free float
Institutions13F, as of Jun 30, 2026
296 holders · 100.22M shares · 66 new positions · 176 increased · 68 reduced · 50 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 11.34M | 8.00% | +2.11M | Aug 7, 2026 |
| Vanguard Capital Management LLC | 5.56M | 3.93% | +654.1K | Aug 13, 2026 |
| Morgan Stanley | 5.11M | 3.60% | +1.94M | Aug 13, 2026 |
| Two Sigma Investments, LP | 4.32M | 3.05% | +812.6K | Aug 14, 2026 |
| UBS Group AG | 4.07M | 2.88% | +1.76M | Aug 13, 2026 |
| Geode Capital Management, LLC | 3.52M | 2.49% | +706.1K | Aug 12, 2026 |
| Jane Street Group, LLC | 3.40M | 2.40% | −759.6K | Aug 14, 2026 |
| State Street Corp | 3.24M | 2.29% | +527.7K | Aug 7, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| SAIF Partners IV L.P.incl. Saif Iv GP, L.P., Andrew Y. Yan +1 more | 7.60% | 8.01M | 13G | Oct 28, 2024 ↗ |
| Kang Sun | 6.80% | 7.77M | 13D | Oct 25, 2024 ↗ |
| Alan Salzman | 6.70% | 7.11M | 13G | Oct 25, 2024 ↗ |
| Trident Capital Management VI, L.L.C. | 6.50% | 6.91M | 13D | Oct 28, 2024 ↗ |
| BlackRock, Inc. | 5.80% | 7.30M | 13G | Oct 17, 2025 ↗ |
| Jane Street Group, LLC | 5.10% | 7.01M | 13G | Apr 28, 2026 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Jonathan Bornstein | officer: President of Amprius Lab | 1.46M | 1.03% | Mar 12, 2025 |
| Kang Sun | director | 1.27M | 0.90% | Aug 25, 2026 |
| Sandra Wallach | officer: Chief Financial Officer | 1.01M | 0.71% | Aug 25, 2025 |
| Constantin Ionel Stefan | officer: Chief Technology Officer | 771.6K | 0.54% | Aug 25, 2026 |
| Donald R. Dixon | director | 639.5K | 0.45% | Jun 16, 2026 |
| Thomas M. Stepien | director, officer: Chief Executive Officer | 616.0K | 0.43% | Aug 25, 2026 |
| Ricardo C. Rodriguez | officer: Chief Financial Officer | 350.0K | 0.25% | Mar 6, 2026 |
| Livingston Satterthwaite | director | 346.5K | 0.24% | Jun 16, 2026 |
| Kathleen A. Bayless | director | 216.1K | 0.15% | Jun 16, 2026 |
| Steven Chu | director | 137.8K | 0.10% | Jun 16, 2026 |
1 ten-percent owner holds 2.50M shares by Form 4, outside the officers-and-directors figure above · 2 people have not refiled in the last 18 months (1.34M shares), so they are not in the figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Aug 24, 2026 | Thomas M. Stepiendirector, officer: Chief Executive Officer | Sale | 8,000 | $10.03 | 594,096 |
| Aug 21, 2026 | Thomas M. Stepiendirector, officer: Chief Executive Officer | Sale | 23,529 | $10.34 | 602,096 |
| Aug 21, 2026 | Constantin Ionel Stefanofficer: Chief Technology Officer | Sale | 29,681 | $10.34 | 771,629 |
| Aug 21, 2026 | Kang Sundirector | Sale | 62,101 | $10.34 | 1,218,397 |
| Jun 15, 2026 | Donald R. Dixondirector | Sale | 85,000 | $17.17 | 359,380 |
| Jun 9, 2026 | Donald R. Dixondirector | Sale | 40,000 | $19.13 | 444,380 |
| Jun 4, 2026 | Thomas M. Stepiendirector, officer: Chief Executive Officer | Sale | 2,000 | $20.97 | 625,625 |
| May 26, 2026 | Donald R. Dixondirector | Sale | 17,895 | $17.90 | 484,380 |
| May 27, 2026 | Constantin Ionel Stefanofficer: Chief Technology Officer | Sale | 3,208 | $17.19 | 801,310 |
| May 27, 2026 | Thomas M. Stepiendirector, officer: Chief Executive Officer | Sale | 4,375 | $17.19 | 694,923 |
CongressHouse and Senate disclosures
Not reported.