Amprius Technologies Inc (AMPX): Congress and insider trades
Who in Congress and inside the company traded AMPX, when each filing appeared, and what buying after each one would have earned against the S&P 500.
Key Facts
- Amprius Technologies Inc (AMPX) is a listed stock on NYSE.
- Insiders filed 0 open market buys worth $0 and 16 sells worth $34M, the latest filed 2026-08-25 (25 August 2026).
- Data as of 2026-09-29 (29 September 2026).
Insider trades in AMPX
as of 2026-08-25| Filed | Insider | Type | Shares | Price | Value | 90 day vs S&P |
|---|---|---|---|---|---|---|
| 25 Aug 2026 | Stepien Thomas M | sell | 23,529 | $10.34 | $243K | n/a |
| 25 Aug 2026 | Stepien Thomas M | sell | 8,000 | $10.03 | $80.2K | n/a |
| 25 Aug 2026 | Sun Kang | sell | 62,101 | $10.34 | $642K | n/a |
| 25 Aug 2026 | Stefan Constantin Ionel | sell | 29,681 | $10.34 | $307K | n/a |
| 16 Jun 2026 | DIXON DONALD R | sell | 85,000 | $17.17 | $1.5M | n/a |
| 11 Jun 2026 | DIXON DONALD R | sell | 40,000 | $19.13 | $765K | n/a |
| 5 Jun 2026 | Stepien Thomas M | sell | 2,000 | $20.97 | $41.9K | n/a |
| 28 May 2026 | Sun Kang | sell | 356 | $17.19 | $6.1K | n/a |
| 28 May 2026 | Stepien Thomas M | sell | 4,375 | $17.19 | $75.2K | n/a |
| 28 May 2026 | DIXON DONALD R | sell | 17,895 | $17.90 | $320K | n/a |
| 28 May 2026 | Stefan Constantin Ionel | sell | 3,208 | $17.19 | $55.2K | n/a |
| 26 May 2026 | Stefan Constantin Ionel | sell | 28,812 | $14.79 | $426K | n/a |
| 26 May 2026 | Stepien Thomas M | sell | 60,702 | $14.79 | $898K | n/a |
| 26 May 2026 | Sun Kang | sell | 67,796 | $14.79 | $1.0M | n/a |
| 2 Apr 2026 | Sun Kang | sell | 1,500,000 | $15.91 | $24M | n/a |
| 24 Mar 2026 | Sun Kang | sell | 217,869 | $18.80 | $4.1M | n/a |
Nothing matches that search.
Related pages
Frequently asked questions
Who has bought AMPX?
0 Congress buys by 0 members and 0 insider buys are on file. The tables on this page list every one.
Did buying AMPX after a disclosure beat the market?
No disclosed buy of this stock has matured 90 days yet. A single stock is a small sample.
Sources: Congressional trades: STOCK Act disclosures, collected from CapitolTrades. Insider trades: SEC Form 4 filings, collected from Finviz. Prices: Yahoo Finance daily adjusted closes. Data as of 2026-09-29 (29 September 2026). About these sources.
Not investment advice. Past disclosed trades do not predict future returns. Disclosures are published late, so the trades shown are ones you could only have copied after the fact. Talk to a licensed adviser before you invest.