Stefan Constantin Ionel insider trades
Stefan Constantin Ionel has filed 24 Form 4s with the SEC that we hold, all for Amprius Technologies, Inc. (AMPX), as Chief Technology Officer. Across all of them we count 0 purchases worth $0 and 19 sales worth $11.2M reported on Form 4. In the last 12 months: 0 purchases ($0) and 10 sales ($10.7M). The largest single trade was a sale of 492,827 shares of Amprius Technologies, Inc. worth $5.9M, dated 2026-01-22. Of 1 sale filed since we began reading the 10b5-1 checkbox, 0 (0%) were marked as made under a 10b5-1 trading plan. The first filing on our record is dated 2022-09-16 and the latest 2026-08-25.
Amprius Technologies, Inc. (AMPX)
| Trade date | Code | Shares | Value as filed | Filed |
|---|---|---|---|---|
| 2023-09-14 | S, sale reported on Form 4 | 46,370 | $169.7K | 2023-09-18 |
| 2023-09-15 | S, sale reported on Form 4 | 33,630 | $130.8K | 2023-09-18 |
| 2024-05-21 | S, sale reported on Form 4 | 5,272 | $7.0K | 2024-05-24 |
| 2024-05-22 | S, sale reported on Form 4 | 4,121 | $5.6K | 2024-05-24 |
| 2024-08-21 | S, sale reported on Form 4 | 8,800 | $9.2K | 2024-08-22 |
| 2024-11-21 | S, sale reported on Form 4 | 8,575 | $16.8K | 2024-11-22 |
| 2025-02-21 | S, sale reported on Form 4 | 9,066 | $28.4K | 2025-02-24 |
| 2025-05-21 | S, sale reported on Form 4 | 20,366 | $49.5K | 2025-05-23 |
| 2025-08-21 | S, sale reported on Form 4 | 19,159 | $130.7K | 2025-08-25 |
| 2025-11-21 | S, sale reported on Form 4 | 25,024 | $252.2K | 2025-11-25 |
| 2025-12-11 | S, sale reported on Form 4 | 198,255 | $2.1M | 2025-12-15 |
| 2026-01-21 | S, sale reported on Form 4 | 73,280 | $879.4K | 2026-01-23 |
| 2026-01-22 | S, sale reported on Form 4 | 492,827 | $5.9M | 2026-01-23 |
| 2026-01-23 | S, sale reported on Form 4 | 1,600 | $19.2K | 2026-01-23 |
| 2026-01-28 | S, sale reported on Form 4 | 39,690 | $476.3K | 2026-01-30 |
| 2026-02-23 | S, sale reported on Form 4 | 25,366 | $257.7K | 2026-02-24 |
| 2026-05-21 | S, sale reported on Form 4 | 28,812 | $426.1K | 2026-05-26 |
| 2026-05-27 | S, sale reported on Form 4 | 3,208 | $55.1K | 2026-05-28 |
| 2026-08-21 | S, sale reported on Form 4 | 29,681 | $306.9K | 2026-08-25 |
Counted from the Form 4 filings this reporting owner (SEC CIK 1940928) filed on EDGAR. Values are the transaction values as filed. See every filing on EDGAR, or browse insider buying and today's insider purchases.
Source: U.S. Securities and Exchange Commission (EDGAR) and other official
government data · Updated 2026-10-12 ·
For informational purposes only, not investment advice.
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