AMPRIUS TECHNOLOGIES INC (AMPX) — insider trading
Industrials · NYSE
AMPRIUS TECHNOLOGIES INC (AMPX) has 28 reported SEC Form 4 insider transactions in our data, including 14 open-market sales among the most recent 28 (latest 2026-08-25).
Recent Form 4 transactions
| Date | Insider | Role | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| 2026-08-25 | Stepien Thomas M | Director, Officer (Chief Executive Officer) | Grant / award / vesting | 346 | — | $0 | Form 4 |
| 2026-08-25 | Stepien Thomas M | Director, Officer (Chief Executive Officer) | Bona fide gift | 346 | — | $0 | Form 4 |
| 2026-08-25 | Stepien Thomas M | Director, Officer (Chief Executive Officer) | Bona fide gift | 5,000 | — | $0 | Form 4 |
| 2026-08-25 | Stepien Thomas M | Director, Officer (Chief Executive Officer) | Bona fide gift | 5,000 | — | $0 | Form 4 |
| 2026-08-25 | Stepien Thomas M | Director, Officer (Chief Executive Officer) | Bona fide gift | 5,000 | — | $0 | Form 4 |
| 2026-08-24 | Stepien Thomas M | Director, Officer (Chief Executive Officer) | Open-market sale | 8,000 | $10.03 | $80.2K | Form 4 |
| 2026-08-21 | Stepien Thomas M | Director, Officer (Chief Executive Officer) | Open-market sale | 23,529 | $10.34 | $243.3K | Form 4 |
| 2026-08-21 | Stefan Constantin Ionel | Officer (Chief Technology Officer) | Open-market sale | 29,681 | $10.34 | $306.9K | Form 4 |
| 2026-08-21 | Sun Kang | Director | Open-market sale | 62,101 | $10.34 | $642.2K | Form 4 |
| 2026-06-15 | DIXON DONALD R | Director | Open-market sale | 85,000 | $17.17 | $1.46M | Form 4 |
| 2026-06-12 | Chu Steven | Director | Grant / award / vesting | 10,423 | — | $0 | Form 4 |
| 2026-06-12 | DIXON DONALD R | Director | Grant / award / vesting | 10,423 | — | $0 | Form 4 |
| 2026-06-12 | SATTERTHWAITE LIVINGSTON | Director | Grant / award / vesting | 10,423 | — | $0 | Form 4 |
| 2026-06-12 | BAYLESS KATHLEEN A | Director | Grant / award / vesting | 10,423 | — | $0 | Form 4 |
| 2026-06-09 | DIXON DONALD R | Director | Open-market sale | 40,000 | $19.13 | $765.2K | Form 4 |
| 2026-06-04 | Stepien Thomas M | Director, Officer (Chief Executive Officer) | Open-market sale | 2,000 | $20.97 | $41.9K | Form 4 |
| 2026-06-04 | Stepien Thomas M | Director, Officer (Chief Executive Officer) | Bona fide gift | 36,914 | — | $0 | Form 4 |
| 2026-06-04 | Stepien Thomas M | Director, Officer (Chief Executive Officer) | Bona fide gift | 36,914 | — | $0 | Form 4 |
| 2026-06-04 | Stepien Thomas M | Director, Officer (Chief Executive Officer) | Bona fide gift | 30,384 | — | $0 | Form 4 |
| 2026-05-27 | Stefan Constantin Ionel | Officer (Chief Technology Officer) | Open-market sale | 3,208 | $17.19 | $55.2K | Form 4 |
| 2026-05-27 | Stepien Thomas M | Director, Officer (Chief Executive Officer) | Open-market sale | 4,375 | $17.19 | $75.2K | Form 4 |
| 2026-05-27 | Sun Kang | Director | Open-market sale | 356 | $17.19 | $6.1K | Form 4 |
| 2026-05-26 | DIXON DONALD R | Director | Open-market sale | 17,895 | $17.90 | $320.3K | Form 4 |
| 2026-05-21 | Stepien Thomas M | Director, Officer (Chief Executive Officer) | Open-market sale | 60,702 | $14.79 | $897.7K | Form 4 |
| 2026-05-21 | Stefan Constantin Ionel | Officer (Chief Technology Officer) | Open-market sale | 28,812 | $14.79 | $426.1K | Form 4 |
| 2026-05-21 | Sun Kang | Director | Open-market sale | 67,796 | $14.79 | $1.00M | Form 4 |
| 2026-05-05 | Sun Kang | Director | Grant / award / vesting | 6,250 | — | $0 | Form 4 |
| 2025-12-19 | Stepien Thomas M | Director, Officer (Chief Executive Officer) | Grant / award / vesting | 200,000 | — | $0 | Form 4/A |
Ask the chat about AMPX's insider activity →
Transaction types are the SEC Form 4 codes: open-market purchases (P) and sales (S) are the only rows that reflect open-market conviction. Awards/vesting (A), option exercises (M/X/C), shares withheld for taxes (F) and gifts (G) are compensation or mechanical, not buying or selling on the open market. Sales may be planned and non-discretionary (e.g. a Rule 10b5-1 plan); open-market buying is not a recommendation to buy. Informational only — not financial advice.
Source: SEC EDGAR Form 3/4/5. See the full company profile: AMPRIUS TECHNOLOGIES INC (AMPX).
Last updated 2026-08-25 (most recent filing date).
Informational only — NOT financial advice. Insider filings are sourced from SEC EDGAR and shown with their reported dates.