AMPX
Amprius Technologies, Inc. · Manufacturing · Market cap $1.2B
Insiders sold $4.0M net in the last 90 days ·4 sellers, 0 buyers· latest Form 4 filed Aug 25, 2026
Insider Buying
$0
reported purchases (SEC code P)
Insider Selling
$85.7M
reported sales (SEC code S)
Unique Insiders
6
in the rolling window
Latest filing
Aug 25, 2026
Sun Kang
Amprius Technologies, Inc. (AMPX) has 37 SEC Form 4 filings (82 transaction rows) in the rolling window, disclosed by 6 distinct insiders. Most recent filing: Aug 25, 2026.
Inside the rolling window, 6 insiders at Amprius Technologies, Inc. reported no open-market purchases and 32 open-market sales totaling $85.7M. The most active filer is Director Sun Kang with 11 filings. Insiders have net sold $47.8M over the trailing 6 months. The most recent open-market filing is a sale of 62,101 shares by Director Sun Kang, dated Aug 21, 2026, worth $642K.
- Industry:Electrical Equipment & Parts
- CEO:Thomas Michael Stepien
- Employees:97
- HQ:Fremont, CA, US
- IPO:2022-09-15
| Source | |||||||
|---|---|---|---|---|---|---|---|
| Director | Sale | 62,101 | $642K | Aug 25 | -18.4% | SEC ↗ | |
| Chief Executive Officer | Sale | 23,529 | $243K | Aug 25 | -18.4% | SEC ↗ | |
| Chief Executive Officer | Sale | 8,000 | $80K | Aug 25 | -18.4% | SEC ↗ | |
| Chief Technology Officer | Sale | 29,681 | $307K | Aug 25 | -18.4% | SEC ↗ | |
| Director | Sale | 85,000 | $1.5M | Jun 16 | -46.4% | SEC ↗ | |
| Director | Sale | 40,000 | $765K | Jun 11 | -51.4% | SEC ↗ | |
| Chief Executive Officer | Sale | 2,000 | $42K | Jun 5 | -57.8% | SEC ↗ | |
| Director | Sale | 356 | $6K | May 28 | -60.1% | SEC ↗ | |
| Chief Executive Officer | Sale | 4,375 | $75K | May 28 | -60.1% | SEC ↗ | |
| Chief Technology Officer | Sale | 3,208 | $55K | May 28 | -60.1% | 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 ↗ |
Earnings: last 7 quarters
Frequently asked questions
How many SEC Form 4 insider filings does AMPX have?
Amprius Technologies, Inc. (AMPX) has 37 SEC Form 4 filings (82 transaction rows) in the rolling 365-day window, disclosed by 6 distinct insiders. Most recent filing: Aug 25, 2026.
When was the most recent SEC Form 4 filing for AMPX?
The most recent Form 4 filing for AMPX on Tracefour is dated Aug 25, 2026.
Who is the most active insider at AMPX?
The most active SEC Form 4 filer at AMPX in the rolling window is Director Sun Kang, with 11 filings.
What is the net insider flow at AMPX over the last 6 months?
Over the trailing 180 days, insiders at AMPX have net sold $47.8M based on SEC Form 4 disclosures.
What is the total insider buy and sell value at AMPX in the current window?
Inside the rolling window, insiders at AMPX bought $0 and sold $85.7M based on SEC Form 4 filings.
Can I get alerts for AMPX insider trading?
Yes. Tracefour sends a free email when a new SEC Form 4 purchase or sale is filed at Amprius Technologies, Inc. (AMPX). Alerts are set per company from the page itself, there is no paid tier, and each email links to the original filing on SEC EDGAR.
Related companies
Amprius Technologies, Inc. is in the Manufacturing sector.