$AMPX insider trading
Over the last 12 months, Amprius Technologies insiders reported no purchases and 27 sales totaling $85.7M across SEC Form 4 filings. 30% of those filings were made under pre-arranged 10b5-1 trading plans.
- Bought · 12m
- — 0 events
- Sold · 12m
- $85.7M 27 events
- Events · 12m
- 27 Form 4 filings, grouped
- Insiders · 12m
- 6 distinct reporters
- 10b5-1 share
- 30% of events, not dollars
All insider trades
Scroll the table sideways for price, value and marks.
| Date | Insider | Type | Shares | Avg price | Value | Δ stake | Marks |
|---|---|---|---|---|---|---|---|
| Aug 24, 2026 | Stepien Thomas MChief Executive Officer · O·D | ▼ Sale | 31,529 | $10.26 | $324K | -5% | 2 tranches |
| Aug 21, 2026 | Sun KangD | ▼ Sale | 62,101 | $10.34 | $642K | -4.8% | — |
| Aug 21, 2026 | Stefan Constantin IonelChief Technology Officer · O | ▼ Sale | 29,681 | $10.34 | $307K | -3.7% | — |
| Jun 15, 2026 | DIXON DONALD RD | ▼ Sale | 85,000 | $17.17 | $1.5M | -19.1% | indirect |
| Jun 9, 2026 | DIXON DONALD RD | ▼ Sale | 40,000 | $19.13 | $765K | -8.3% | indirect |
| Jun 4, 2026 | Stepien Thomas MChief Executive Officer · O·D | ▼ Sale | 2,000 | $20.97 | $42K | -0.3% | — |
| May 27, 2026 | Stepien Thomas MChief Executive Officer · O·D | ▼ Sale | 4,375 | $17.19 | $75K | -0.6% | — |
| May 27, 2026 | Stefan Constantin IonelChief Technology Officer · O | ▼ Sale | 3,208 | $17.19 | $55K | -0.4% | — |
| May 27, 2026 | Sun KangD | ▼ Sale | 356 | $17.19 | $6K | — | — |
| May 26, 2026 | DIXON DONALD RD | ▼ Sale | 17,895 | $17.9 | $320K | -3.6% | indirect |
| May 21, 2026 | Sun KangD | ▼ Sale | 67,796 | $14.79 | $1.0M | -5% | — |
| May 21, 2026 | Stefan Constantin IonelChief Technology Officer · O | ▼ Sale | 28,812 | $14.79 | $426K | -3.5% | — |
| May 21, 2026 | Stepien Thomas MChief Executive Officer · O·D | ▼ Sale | 60,702 | $14.79 | $898K | -8% | — |
| Apr 1, 2026 | Sun KangD | ▼ Sale | 1,500,000 | $15.91 | $23.9M | -52.8% | plan · 2 tranches |
| Mar 23, 2026 | Sun KangD | ▼ Sale | 217,869 | $18.8 | $4.1M | -79.4% | plan · 2 tranches · indirect |
| Mar 12, 2026 | HSIEH Wen HsuanD | ▼ Sale | 413,146 | $18.44 | $7.6M | -90.3% | 2 tranches |
| Mar 12, 2026 | Chu StevenD | ▼ Sale | 322,197 | $18.2 | $5.9M | -71.7% | 4 tranches |
| Feb 23, 2026 | Stefan Constantin IonelChief Technology Officer · O | ▼ Sale | 25,366 | $10.16 | $258K | -3.4% | — |
| Feb 23, 2026 | Sun KangD | ▼ Sale | 61,251 | $10.16 | $622K | -4.4% | — |
| Jan 28, 2026 | Stefan Constantin IonelChief Technology Officer · O | ▼ Sale | 39,690 | $12 | $476K | -5% | plan |
| Jan 23, 2026 | Stefan Constantin IonelChief Technology Officer · O | ▼ Sale | 567,707 | $12.03 | $6.8M | -43.1% | plan · 3 tranches |
| Jan 20, 2026 | Sun KangD | ▼ Sale | 993,733 | $11.06 | $11.0M | -41.5% | plan · 2 tranches |
| Jan 12, 2026 | Sun KangD | ▼ Sale | 506,267 | $10.1 | $5.1M | -26.5% | plan |
| Dec 11, 2025 | Stefan Constantin IonelChief Technology Officer · O | ▼ Sale | 198,255 | $10.51 | $2.1M | -20.9% | plan |
| Nov 21, 2025 | Stefan Constantin IonelChief Technology Officer · O | ▼ Sale | 25,024 | $10.08 | $252K | -3% | — |
| Nov 21, 2025 | Sun KangChief Executive Officer · O·D | ▼ Sale | 68,655 | $10.08 | $692K | -4.7% | — |
| Nov 17, 2025 | Sun KangChief Executive Officer · O·D | ▼ Sale | 1,000,000 | $10.6 | $10.6M | -40.4% | plan |
| Aug 21, 2025 | Stefan Constantin IonelChief Technology Officer · O | ▼ Sale | 19,159 | $6.82 | $131K | -2.2% | — |
| Aug 21, 2025 | Wallach SandraChief Financial Officer · O | ▼ Sale | 28,390 | $6.82 | $194K | -2.7% | — |
| Aug 21, 2025 | Sun KangChief Executive Officer · O·D | ▼ Sale | 65,654 | $6.82 | $448K | -4.3% | — |
Every $AMPX filing on this page is one API call away
The same Form 4 data over REST or MCP, already grouped into events with the plan flag and the dollar value read. A free key does 100 calls a day and needs no card. Prefer email? Amprius Technologies filings can reach your inbox instead.
Corporate insiders — officers, directors and 10%+ owners — must report their trades to the SEC on Form 4 within two business days. This page shows open-market activity: purchases (code P), sales (S) and dispositions back to the issuer (D). Scheduled compensation events such as stock grants and option exercises are also filed on Form 4 but carry no trading signal, so they are not shown and counts here can be lower than the raw EDGAR filing total. We group each filing's transactions into one economic event (a laddered 10b5-1 sale is one event, not 25 rows), flag pre-arranged plans and late filings, and link every event to its AI-scored article in the $AMPX feed.