Stefan Constantin Ionel — SEC Form 4 filings
SEC reporting owner CIK 1940928. 19 Form 4 filings on record with FilingPulse; latest filed 2026-08-25.
Transaction summary — filings shown
Covers all 19 filings on record, filed 2024-03-19 to 2026-08-25. Counts and totals are arithmetic on values as filed — descriptive data, not a recommendation.
- Open-market purchases (code P, non-derivative): none reported.
- Open-market sales (code S, non-derivative): 17 legs across 14 filings — 993,102 shares, $10,935,421 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 28.
- Largest priced transaction: sale of 492,827 shares @ $12.04 ($5,931,912) in Amprius Technologies, Inc., filed 2026-01-23.
By issuer — same filings
Open-market purchase/sale legs on non-derivative securities, grouped by issuer. Role is as filed on the newest filing for that issuer. Dollar totals cover priced legs only (shares × price as filed). Ordered by priced transaction value, largest first.
| Issuer | Role (as filed) | Filings | Purchases (P) | Sales (S) | Other legs |
|---|---|---|---|---|---|
| Amprius Technologies, Inc. (AMPX) | Chief Technology Officer | 19 | — | 17 legs · 993,102 sh · $10,935,421 | 28 |
Form 4 filings — Stefan Constantin Ionel
| Filed | Form | Issuer | Reported transactions | Source |
|---|---|---|---|---|
| 2026-08-25 | 4 | Amprius Technologies, Inc. (AMPX) | Sale (S): 29,681 @ $10.34 | EDGAR |
| 2026-05-28 | 4 | Amprius Technologies, Inc. (AMPX) | Sale (S): 3,208 @ $17.19 | EDGAR |
| 2026-05-26 | 4 | Amprius Technologies, Inc. (AMPX) | Sale (S): 28,812 @ $14.79 | EDGAR |
| 2026-03-06 | 4 | Amprius Technologies, Inc. (AMPX) | Grant/award (A): 110,000 @ $0 | EDGAR |
| 2026-02-24 | 4 | Amprius Technologies, Inc. (AMPX) | Sale (S): 25,366 @ $10.16 | EDGAR |
| 2026-01-30 | 4 | Amprius Technologies, Inc. (AMPX) | Option exercise (M): 90 @ $0.62 · Option exercise (M): 39,600 @ $0.05 · Sale (S): 39,690 @ $12.00 · Option exercise (M): 90 (derivative) @ $0 · Option exercise (M): 39,600 (derivative) @ $0 | EDGAR |
| 2026-01-23 | 4 | Amprius Technologies, Inc. (AMPX) | Option exercise (M): 41,563 @ $0.62 · Option exercise (M): 15,834 @ $0.05 · Option exercise (M): 15,883 @ $0.05 · Sale (S): 73,280 @ $12.00 · Option exercise (M): 253,928 @ $0.05 · Option exercise (M): 72,795 @ $0.45 · +11 more | EDGAR |
| 2025-12-15 | 4 | Amprius Technologies, Inc. (AMPX) | Option exercise (M): 125,000 @ $0.05 · Sale (S): 198,255 @ $10.51 · Option exercise (M): 125,000 (derivative) @ $0 | EDGAR |
| 2025-11-25 | 4 | Amprius Technologies, Inc. (AMPX) | Sale (S): 25,024 @ $10.08 | EDGAR |
| 2025-08-25 | 4 | Amprius Technologies, Inc. (AMPX) | Sale (S): 19,159 @ $6.82 | EDGAR |
| 2025-05-23 | 4 | Amprius Technologies, Inc. (AMPX) | Sale (S): 20,366 @ $2.43 | EDGAR |
| 2025-03-21 | 4 | Amprius Technologies, Inc. (AMPX) | Grant/award (A): 461,540 @ $0 | EDGAR |
| 2025-03-18 | 4 | Amprius Technologies, Inc. (AMPX) | Option exercise (M): 3,471 @ $0.98 · Option exercise (M): 3,471 (derivative) @ $0 | EDGAR |
| 2025-02-24 | 4 | Amprius Technologies, Inc. (AMPX) | Sale (S): 9,066 @ $3.13 | EDGAR |
| 2024-11-22 | 4 | Amprius Technologies, Inc. (AMPX) | Sale (S): 8,575 @ $1.96 | EDGAR |
| 2024-10-25 | 4 | Amprius Technologies, Inc. (AMPX) | Grant/award (A): 3,471 (derivative) · Grant/award (A): 41,653 (derivative) · Grant/award (A): 139,613 (derivative) | EDGAR |
| 2024-08-22 | 4 | Amprius Technologies, Inc. (AMPX) | Sale (S): 8,800 @ $1.04 | EDGAR |
| 2024-05-24 | 4 | Amprius Technologies, Inc. (AMPX) | Sale (S): 5,272 @ $1.33 · Sale (S): 4,121 @ $1.36 | EDGAR |
| 2024-03-19 | 4 | Amprius Technologies, Inc. (AMPX) | Grant/award (A): 374,570 @ $0 | EDGAR |
FilingPulse's Form 4 archive currently extends back to 2024-01-11 and is expanding backward through EDGAR history — earlier filings by this insider may not be indexed yet. Names and roles are shown as filed.
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