Stefan Constantin Ionel
SEC insider (Form 3/4/5 filer). CIK 0001940928. Chief Technology Officer at Amprius Technologies, Inc. (AMPX). 30 reported Form 4/5 transactions since Sep 2024; latest on Aug 21, 2026. Located in FREMONT, CA.
Companies Stefan Constantin Ionel has filed insider reports for
- Amprius Technologies, Inc. (AMPX): Officer, Chief Technology Officer
Stefan Constantin Ionel
CIK: 0001940928
Transaction Breakdown
High conviction signal
Position reduction
Derivative conversions
Compensation grants
Gifts, tax withholding, conversions, dispositions to the issuer and other codes
Companies & Roles (1)
Amprius Technologies, Inc.
Discretionary Trading P&L
Holdings
Transaction History (30 total)
- Aug 21, 2026AMPX
Amprius Technologies, Inc.
SaleDirect29.7K shares at avg. $10.34$307K - May 27, 2026AMPX
Amprius Technologies, Inc.
SaleDirect3.2K shares at avg. $17.19$55K - May 21, 2026AMPX
Amprius Technologies, Inc.
SaleDirect28.8K shares at avg. $14.79$426K - Mar 4, 2026AMPX
Amprius Technologies, Inc.
AwardDirect110K shares- - Feb 23, 2026AMPX
Amprius Technologies, Inc.
SaleDirect25.4K shares at avg. $10.16$258K - Jan 28, 2026AMPX
Amprius Technologies, Inc.
ExerciseDirect90 shares at avg. $0.62$55.8 - Jan 28, 2026AMPX
Amprius Technologies, Inc.
ExerciseDirect39.6K shares at avg. $0.05$2K - Jan 28, 2026AMPX
Amprius Technologies, Inc.
SaleDirect39.7K shares at avg. $12.00$476K - Jan 23, 2026AMPX
Amprius Technologies, Inc.
ExerciseDirect1.6K shares at avg. $0.05$80 - Jan 23, 2026AMPX
Amprius Technologies, Inc.
SaleDirect1.6K shares at avg. $12.00$19K
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Aug 21, 2026 | AMPX Amprius Technologies, Inc. | Sale | 29,681 | $10.34 | $306,931 | Direct |
| May 27, 2026 | AMPX Amprius Technologies, Inc. | Sale | 3,208 | $17.19 | $55,157 | Direct |
| May 21, 2026 | AMPX Amprius Technologies, Inc. | Sale | 28,812 | $14.79 | $426,083 | Direct |
| Mar 4, 2026 | AMPX Amprius Technologies, Inc. | Award | 110,000 | - | $0 | Direct |
| Feb 23, 2026 | AMPX Amprius Technologies, Inc. | Sale | 25,366 | $10.16 | $257,604 | Direct |
| Jan 28, 2026 | AMPX Amprius Technologies, Inc. | Exercise | 90 | $0.62 | $56 | Direct |
| Jan 28, 2026 | AMPX Amprius Technologies, Inc. | Exercise | 39,600 | $0.05 | $1,980 | Direct |
| Jan 28, 2026 | AMPX Amprius Technologies, Inc. | Sale | 39,690 | $12.00 | $476,351 | Direct |
| Jan 23, 2026 | AMPX Amprius Technologies, Inc. | Exercise | 1,600 | $0.05 | $80 | Direct |
| Jan 23, 2026 | AMPX Amprius Technologies, Inc. | Sale | 1,600 | $12.00 | $19,200 | Direct |
1-10 of 30 transactions