Who
Constantin Ionel Stefan
Chief Technology Officer
Company insider
Files Form 4 as: Chief Technology Officer, Amprius Technologies.
In numbers
- Trades disclosed
- 84
- Buys
- 0
- Sells
- 19
- Bought
- $0
- Sold
- $19.6M
- Companies
- 1
- Companies where not an officer
- 0
- First trade
- 14 Sep 2022
- Last trade
- 21 Aug 2026
- Last filed
- 25 Aug 2026
Companies traded
Activity over time
1 Nov 2024 – 1 Oct 2026
Buys above the line, sells below, each month.
Every trade
| Traded | Company | What | Amount | |
|---|---|---|---|---|
| 21 Aug 2026filed 25 Aug 2026 | AMPX Amprius TechnologiesElectronic Components & EMS | SEC FORM 4 Sold | $307K29,681 at $10.34 | filing |
| 21 Aug 2026filed 25 Aug 2026 | AMPX Amprius TechnologiesElectronic Components & EMS | SEC FORM 4 Sold | $307K29,681 at $10.34 | filing |
| 27 May 2026filed 28 May 2026 | AMPX Amprius TechnologiesElectronic Components & EMS | SEC FORM 4 Sold | $55K3,208 at $17.19 | filing |
| 27 May 2026filed 28 May 2026 | AMPX Amprius TechnologiesElectronic Components & EMS | SEC FORM 4 Sold | $55K3,208 at $17.19 | filing |
| 21 May 2026filed 26 May 2026 | AMPX Amprius TechnologiesElectronic Components & EMS | SEC FORM 4 Sold | $426K28,812 at $14.79 | filing |
| 21 May 2026filed 26 May 2026 | AMPX Amprius TechnologiesElectronic Components & EMS | SEC FORM 4 Sold | $426K28,812 at $14.79 | filing |
| 4 Mar 2026filed 6 Mar 2026 | AMPX Amprius TechnologiesElectronic Components & EMS | SEC FORM 4 Code A | —110,000 at $0.00 | filing |
| 4 Mar 2026filed 6 Mar 2026 | AMPX Amprius TechnologiesElectronic Components & EMS | SEC FORM 4 Code A | —110,000 at $0.00 | filing |
| 23 Feb 2026filed 24 Feb 2026 | AMPX Amprius TechnologiesElectronic Components & EMS | SEC FORM 4 Sold | $258K25,366 at $10.16 | filing |
| 23 Feb 2026filed 24 Feb 2026 | AMPX Amprius TechnologiesElectronic Components & EMS | SEC FORM 4 Sold | $258K25,366 at $10.16 | filing |
| 28 Jan 2026filed 30 Jan 2026 | AMPX Amprius TechnologiesElectronic Components & EMS | SEC FORM 4 Code M | $5690 at $0.62 | filing |
| 28 Jan 2026filed 30 Jan 2026 | AMPX Amprius TechnologiesElectronic Components & EMS | SEC FORM 4 Code M | $1,98039,600 at $0.05 | filing |
| 28 Jan 2026filed 30 Jan 2026 | AMPX Amprius TechnologiesElectronic Components & EMS | SEC FORM 4 Sold | $476K39,690 at $12.00 | filing |
| 28 Jan 2026filed 30 Jan 2026 | AMPX Amprius Technologiesoption or derivative · Electronic Components & EMS | SEC FORM 4 Code M | —90 at $0.00 | filing |
| 28 Jan 2026filed 30 Jan 2026 | AMPX Amprius Technologiesoption or derivative · Electronic Components & EMS | SEC FORM 4 Code M | —39,600 at $0.00 | filing |
| 28 Jan 2026filed 30 Jan 2026 | AMPX Amprius Technologiesoption or derivative · Electronic Components & EMS | SEC FORM 4 Code M | —90 at $0.00 | filing |
| 28 Jan 2026filed 30 Jan 2026 | AMPX Amprius Technologiesoption or derivative · Electronic Components & EMS | SEC FORM 4 Code M | —39,600 at $0.00 | filing |
| 28 Jan 2026filed 30 Jan 2026 | AMPX Amprius TechnologiesElectronic Components & EMS | SEC FORM 4 Code M | $5690 at $0.62 | filing |
| 28 Jan 2026filed 30 Jan 2026 | AMPX Amprius TechnologiesElectronic Components & EMS | SEC FORM 4 Code M | $1,98039,600 at $0.05 | filing |
| 28 Jan 2026filed 30 Jan 2026 | AMPX Amprius TechnologiesElectronic Components & EMS | SEC FORM 4 Sold | $476K39,690 at $12.00 | filing |
News
No headline names them, or the companies they trade most, lately.