AMPX
Amprius Technologies, Inc.
NYSE · Industrials · Electrical Equipment & Parts · US
$9.89
+2.70%0
Insider buys (3m)
6
Insider sells (3m)
-$3.5M
Net value (3m)
-50.2%
Price return (3m)
Form 4 filings
| Date | Insider | Activity | Shares | Price |
|---|---|---|---|---|
| Aug 25, 2026 | Stepien Thomas M · director, officer: Chief Executive Officer | Sale | 8,000 | $10 |
| Aug 25, 2026 | Stepien Thomas M · director, officer: Chief Executive Officer | Sale | 23,529 | $10 |
| Aug 25, 2026 | Stefan Constantin Ionel · officer: Chief Technology Officer | Sale | 29,681 | $10 |
| Aug 25, 2026 | Stepien Thomas M · director, officer: Chief Executive Officer | A-Award | 346 | $0.00 |
| Aug 25, 2026 | Sun Kang · director | Sale | 62,101 | $10 |
| Jun 16, 2026 | Chu Steven · director | A-Award | 10,423 | $0.00 |
| Jun 16, 2026 | DIXON DONALD R · director | Sale | 85,000 | $17 |
| Jun 16, 2026 | DIXON DONALD R · director | A-Award | 10,423 | $0.00 |
| Jun 16, 2026 | SATTERTHWAITE LIVINGSTON · director | A-Award | 10,423 | $0.00 |
| Jun 16, 2026 | BAYLESS KATHLEEN A · director | A-Award | 10,423 | $0.00 |
| Jun 11, 2026 | DIXON DONALD R · director | Sale | 40,000 | $19 |
| Jun 5, 2026 | Stepien Thomas M · director, officer: Chief Executive Officer | Sale | 2,000 | $21 |
| May 28, 2026 | DIXON DONALD R · director | Sale | 17,895 | $18 |
| May 28, 2026 | Stefan Constantin Ionel · officer: Chief Technology Officer | Sale | 3,208 | $17 |
| May 28, 2026 | Stepien Thomas M · director, officer: Chief Executive Officer | Sale | 4,375 | $17 |
| May 28, 2026 | Sun Kang · director | Sale | 356 | $17 |
| May 26, 2026 | Stepien Thomas M · director, officer: Chief Executive Officer | Sale | 60,702 | $15 |
| May 26, 2026 | Stefan Constantin Ionel · officer: Chief Technology Officer | Sale | 28,812 | $15 |
| May 26, 2026 | Sun Kang · director | Sale | 67,796 | $15 |
| May 7, 2026 | Stepien Thomas M · director, officer: Chief Executive Officer | A-Award | 200,000 | $0.00 |
| May 7, 2026 | Sun Kang · director | A-Award | 6,250 | $0.00 |
| Apr 2, 2026 | Sun Kang · director | M-Exempt | 187,495 | $3.68 |
| Apr 2, 2026 | Sun Kang · director | M-Exempt | 1,312,505 | $1.78 |
| Apr 2, 2026 | Sun Kang · director | Sale | 1,250,963 | $16 |
| Apr 2, 2026 | Sun Kang · director | Sale | 249,037 | $17 |
| Mar 24, 2026 | Sun Kang · director | Sale | 65,046 | $19 |
| Mar 24, 2026 | Sun Kang · director | Sale | 152,823 | $19 |
| Mar 13, 2026 | HSIEH Wen Hsuan · director | Sale | 282,500 | $19 |
| Mar 13, 2026 | HSIEH Wen Hsuan · director | M-Exempt | 270,251 | $2.61 |
| Mar 13, 2026 | HSIEH Wen Hsuan · director | Sale | 130,646 | $18 |
Institutional positioning
13F filings over the trailing two quarters
New 148Increased 213Reduced 122Sold out 47
| Filer | Action | Shares | Filed |
|---|---|---|---|
| BlackRock, Inc. | Increased | 11,335,092 | Aug 7, 2026 |
| JANE STREET GROUP, LLC | Increased | 9,334,871 | Aug 14, 2026 |
| BLACKROCK, INC. | Increased | 9,225,611 | May 13, 2026 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Increased | 8,246,669 | Aug 14, 2026 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Increased | 6,601,470 | May 15, 2026 |
| JANE STREET GROUP, LLC | Increased | 6,574,256 | May 12, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 5,562,985 | Aug 13, 2026 |
| UBS Group AG | Increased | 5,374,069 | Aug 13, 2026 |
| CITADEL ADVISORS LLC | Increased | 5,269,644 | Sep 2, 2026 |
| MORGAN STANLEY | Increased | 5,105,505 | Aug 13, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 4,908,875 | May 15, 2026 |
| Point72 Asset Management, L.P. | Increased | 4,379,711 | Aug 14, 2026 |
| TWO SIGMA INVESTMENTS, LP | Increased | 4,318,630 | Aug 14, 2026 |
| CITADEL ADVISORS LLC | Increased | 4,216,760 | May 15, 2026 |
| DRIEHAUS CAPITAL MANAGEMENT LLC | Increased | 3,794,178 | May 15, 2026 |
Insider activity from SEC Form 4; institutional positioning from 13F filings · Latest filing Aug 25, 2026