AMPX
Amprius Technologies, Inc.
Latest Form 4:Sale$642KbySun Kang (Director) · filed Aug 25, 2026
Amprius Technologies, Inc. (AMPX) has 38 SEC Form 4 filings (83 transaction rows) in the rolling window, disclosed by 6 distinct insiders. Most recent filing: Aug 25, 2026.
The most active filer is Director Sun Kang with 11 filings. Insiders have net sold $47.8M over the trailing 6 months.
- Industry:Electrical Equipment & Parts
- CEO:Thomas Michael Stepien
- Employees:99
- HQ:Fremont, CA, US
- IPO:2022-09-15
Insider Buying
$0
reported purchases (SEC code P)
Insider Selling
$85.7M
reported sales (SEC code S)
Unique Insiders
6
in the rolling window
Market Cap
$1.4B
latest known value
| Source | ||||||
|---|---|---|---|---|---|---|
| Director | Sale | 62,101 | $642K | Aug 25 | SEC ↗ | |
| Chief Executive Officer | Sale | 23,529 | $243K | Aug 25 | SEC ↗ | |
| Chief Executive Officer | Sale | 8,000 | $80K | Aug 25 | SEC ↗ | |
| Chief Technology Officer | Sale | 29,681 | $307K | Aug 25 | SEC ↗ | |
| Director | Sale | 85,000 | $1.5M | Jun 16 | SEC ↗ | |
| Director | Sale | 40,000 | $765K | Jun 11 | SEC ↗ | |
| Chief Executive Officer | Sale | 2,000 | $42K | Jun 5 | SEC ↗ | |
| Director | Sale | 356 | $6K | May 28 | SEC ↗ | |
| Chief Executive Officer | Sale | 4,375 | $75K | May 28 | SEC ↗ | |
| Chief Technology Officer | Sale | 3,208 | $55K | May 28 | SEC ↗ | |
DIXON DONALD RFirst filing | Director | Sale | 17,895 | $320K | May 28 | SEC ↗ |
| Director | Sale | 67,796 | $1.0M | May 26 | SEC ↗ | |
Stepien Thomas MFirst filing | Chief Executive Officer | Sale | 60,702 | $898K | May 26 | SEC ↗ |
Stefan Constantin IonelFirst in 3 months | Chief Technology Officer | Sale | 28,812 | $426K | May 26 | SEC ↗ |
| Director | Sale | 1,500,000 | $23.9M | Apr 2 | SEC ↗ | |
| Director | Sale | 217,869 | $4.1M | Mar 24 | SEC ↗ | |
HSIEH Wen HsuanFirst filing | Director | Sale | 413,146 | $7.6M | Mar 13 | SEC ↗ |
Chu StevenFirst filing | Director | Sale | 166,632 | $3.0M | Mar 12 | SEC ↗ |
Chu StevenFirst filing | Director | Sale | 155,565 | $2.9M | Mar 12 | SEC ↗ |
| Director | Sale | 61,251 | $622K | Feb 24 | SEC ↗ | |
| Chief Technology Officer | Sale | 25,366 | $258K | Feb 24 | SEC ↗ | |
| Chief Technology Officer | Sale | 39,690 | $476K | Jan 30 | SEC ↗ | |
| Chief Technology Officer | Sale | 73,280 | $879K | Jan 23 | SEC ↗ | |
| Chief Technology Officer | Sale | 492,827 | $5.9M | Jan 23 | SEC ↗ | |
| Chief Technology Officer | Sale | 1,600 | $19K | Jan 23 | SEC ↗ | |
| Director | Sale | 950,548 | $10.5M | Jan 20 | SEC ↗ | |
| Director | Sale | 43,185 | $476K | Jan 20 | SEC ↗ | |
| Director | Sale | 506,267 | $5.1M | Jan 14 | SEC ↗ | |
| Chief Technology Officer | Sale | 198,255 | $2.1M | Dec 15 | SEC ↗ | |
Stefan Constantin IonelFirst filing | Chief Technology Officer | Sale | 25,024 | $252K | Nov 25 | SEC ↗ |
| Chief Executive Officer | Sale | 68,655 | $692K | Nov 25 | SEC ↗ | |
Sun KangFirst filing | Chief Executive Officer | Sale | 1,000,000 | $10.6M | Nov 19 | SEC ↗ |
Related companies
Amprius Technologies, Inc. is in the Manufacturing sector.