Constantin Ionel Stefan serves as Executive at Amprius Technologies, Inc., where they oversee executive responsibilities. Since joining the company, Constantin Ionel Stefan has executed 13 insider transactions totaling $2.8M, demonstrating a bearish approach to their equity position. Their most recent transaction on Dec 11, 2025 involved selling 198,255 shares valued at $2.1M.
Constantin Ionel Stefan currently holds 748,696 shares of Amprius Technologies, Inc. (AMPX), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, Constantin Ionel Stefan has been a net seller of AMPX stock. They have purchased $0 and sold $2.8M worth of shares.
Constantin Ionel Stefan's most recent insider trade was on Dec 11, 2025, when they sold 198,255 shares at $10.51 per share.
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| $0.05 |
| Discretionary |
| Nov 21, 2025 | AMPX | $252.2K | Sale | 25,024 | $10.08 | Discretionary |
| Aug 21, 2025 | AMPX | $130.7K | Sale | 19,159 | $6.82 | Discretionary |
| Aug 21, 2024 | AMPX | $9.2K | Sale | 8,800 | $1.04 | Discretionary |
| May 22, 2024 | AMPX | $5.6K | Sale | 4,121 | $1.36 | Discretionary |
| May 21, 2024 | AMPX | $7.0K | Sale | 5,272 | $1.33 | Discretionary |
| Mar 19, 2024 | AMPX | $0 | Award | 374,570 | $N/A | Discretionary |
| Sep 15, 2023 | AMPX | $130.8K | Sale | 33,630 | $3.89 | Discretionary |
| Sep 14, 2023 | AMPX | $169.7K | Sale | 46,370 | $3.66 | Discretionary |
| Sep 9, 2023 | AMPX | $4.0K | Option Exercise | 80,000 | $0.05 | Discretionary |
| Dec 14, 2022 | AMPX | $1.5K | Payment | 209 | $7.20 | Discretionary |
| Dec 14, 2022 | AMPX | $1.5K | Option Exercise | 30,000 | $0.05 | Discretionary |