Stefan Constantin Ionel
- SEC CIK
- 0001940928
In the past year, 8 open-market sale filings worth $10.7M and no purchases.
Current role at each company
- AMPX Amprius Technologies, Inc.Chief Technology Officeras of Aug 25, 2026
Open-market trades in the past year
Open-market purchases (P) and sales (S) filed in the last 365 days, not counting derivative securities or duplicate filings. Values leave out price outliers.
- Bought
- –
- 0 filings
- Sold
- $10.7M
- 8 filings
- Net
- −$10.7M
- Bought minus sold
- Companies
- 1
- With open-market trades
Trades
Every Form 4 that lists Stefan Constantin Ionel as a reporting owner, including filings made jointly with others, grouped by company. Each row adds up one type of transaction in one filing. Only open-market purchases (P) and sales (S) are shown by default.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Aug 25, 2026 (view filing)5:22 PM ET | Aug 21 | 4 days | Stefan Constantin IonelChief Technology Officer | SSale | −29.7K | $10.34 | −$306.9K | −3.7%771.6K after | |
| May 28, 2026 (view filing) | May 27 | 1 day | Stefan Constantin IonelChief Technology Officer | SSale | −3.21K | $17.19 | −$55.1K | −0.4%801.3K after | |
| May 26, 2026 (view filing) | May 21 | 5 days | Stefan Constantin IonelChief Technology Officer | SSale | −28.8K | $14.79 | −$426.1K | −3.5%804.5K after | |
| Feb 24, 2026 (view filing) | Feb 23 | 1 day | Stefan Constantin IonelChief Technology Officer | SSale | −25.4K | $10.16 | −$257.7K | −3.4%723.3K after | |
| Jan 30, 2026 (view filing)6:02 PM ET | Jan 28 | 2 days | Stefan Constantin IonelChief Technology Officer | SSale | −39.7K | $12.00 | −$476.4K | −5.0%748.7K after | |
| Jan 23, 2026 (view filing)5:36 PM ET | Jan 21-23 | 2 days | Stefan Constantin IonelChief Technology Officer | SSale | −567.7K | $12.03 | −$6.83M | −43.1%748.7K after | 3 lots |
| Dec 15, 2025 (view filing)6:25 PM ET | Dec 11 | 4 days | Stefan Constantin IonelChief Technology Officer | SSale | −198.3K | $10.51 | −$2.08M | −20.9%748.7K after | |
| Nov 25, 2025 (view filing) | Nov 21 | 4 days | Stefan Constantin IonelChief Technology Officer | SSale | −25.0K | $10.08 | −$252.2K | −3.0%822.0K after | |
| Aug 25, 2025 (view filing) | Aug 21 | 4 days | Stefan Constantin IonelChief Technology Officer | SSale | −19.2K | $6.82 | −$130.7K | −2.2%847.0K after | |
| May 23, 2025 (view filing) | May 21 | 2 days | Stefan Constantin IonelChief Technology Officer | SSale | −20.4K | $2.43 | −$49.5K | −2.3%866.1K after | |
| Feb 24, 2025 (view filing) | Feb 21 | 3 days | Stefan Constantin IonelChief Technology Officer | SSale | −9.07K | $3.13 | −$28.4K | −2.1%421.5K after | |
| Nov 22, 2024 (view filing) | Nov 21 | 1 day | Stefan Constantin IonelChief Technology Officer | SSale | −8.57K | $1.96 | −$16.8K | −2.0%430.6K after | |
| Aug 22, 2024 (view filing) | Aug 21 | 1 day | Stefan Constantin IonelChief Technology Officer | SSale | −8.80K | $1.04 | −$9.15K | −2.2%386.2K after | |
| May 24, 2024 (view filing) | May 21-22 | 3 daysLate | Stefan Constantin IonelChief Technology Officer | SSale | −9.39K | $1.34 | −$12.6K | −2.3%395.0K after | 2 lots |
| Sep 18, 2023 (view filing) | Sep 14-15 | 4 days | Stefan Constantin IonelChief Technology Officer | SSale | −80.0K | $3.76 | −$300.5K | −72.9%29.8K after | 2 lots |