According to recent filings covering the 90 days ending February 15, 2026, the three most significant insider holders at Amprius Technologies are TenPercentOwner Inc. Amprius, (2.50Mn shares), President Of Amprius Lab Jonathan Bornstein (1.46Mn shares), Director Kang Sun (1.40Mn shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Inc. Amprius, | 2,500,071 | 25 Oct, 2024 | |
| Jonathan Bornstein | President Of Amprius Lab | 1,463,618 | 12 Mar, 2025 |
| Kang Sun | 1,403,651 | 20 Jan, 2026 | |
| Justin E Mirro | 1,337,895 | 07 Jun, 2024 | |
| Sandra Wallach | Chief Financial Officer | 1,005,275 | 25 Aug, 2025 |
| Constantin Ionel Stefan | Chief Technology Officer | 748,696 | 30 Jan, 2026 |
| Thomas M Stepien | President | 610,000 | 22 Dec, 2025 |
| Donald R Dixon | 394,656 | 17 Jun, 2025 | |
| Livingston Satterthwaite | 336,083 | 17 Jun, 2025 | |
| Kathleen A Bayless | 205,697 | 17 Jun, 2025 | |
| Ricardo C. Rodriguez | Chief Financial Officer | 200,000 | 08 Oct, 2025 |
| Steven Chu | 189,839 | 17 Jun, 2025 | |
| Wen Hsuan Hsieh | 187,339 | 17 Jun, 2025 | |
| Mary Gustanski | 146,396 | 07 Jun, 2024 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 28 Jan, 2026 | Constantin Ionel Stefan | Common stock | A | 90 | $0.62 | 748,786 | D | M |
| 28 Jan, 2026 | Constantin Ionel Stefan | Common stock | D | 39,690 | $12.00 | 748,696 | D | S |
| 28 Jan, 2026 | Constantin Ionel Stefan | Common stock | A | 39,600 | $0.05 | 788,386 | D | M |
| 23 Jan, 2026 | Constantin Ionel Stefan | Common stock | A | 1,600 | $0.05 | 750,296 | D | M |
| 23 Jan, 2026 | Constantin Ionel Stefan | Common stock | D | 1,600 | $12.00 | 748,696 | D | S |
| 22 Jan, 2026 | Constantin Ionel Stefan | Common stock | A | 72,795 | $0.45 | 1,075,419 | D | M |
| 22 Jan, 2026 | Constantin Ionel Stefan | Common stock | D | 492,827 | $12.04 | 748,696 | D | S |
| 22 Jan, 2026 | Constantin Ionel Stefan | Common stock | A | 253,928 | $0.05 | 1,002,624 | D | M |
| 22 Jan, 2026 | Constantin Ionel Stefan | Common stock | A | 166,104 | $0.05 | 1,241,523 | D | M |
| 21 Jan, 2026 | Constantin Ionel Stefan | Common stock | D | 73,280 | $12.00 | 748,696 | D | S |
| 21 Jan, 2026 | Constantin Ionel Stefan | Common stock | A | 15,883 | $0.05 | 821,976 | D | M |
| 21 Jan, 2026 | Constantin Ionel Stefan | Common stock | A | 41,563 | $0.62 | 790,259 | D | M |
| 21 Jan, 2026 | Constantin Ionel Stefan | Common stock | A | 15,834 | $0.05 | 806,093 | D | M |
| 20 Jan, 2026 | Kang Sun | Common stock | D | 43,185 | $11.03 | 1,403,651 | D | S |
| 20 Jan, 2026 | Kang Sun | Common stock | A | 43,185 | $1.78 | 1,446,836 | D | M |
| 16 Jan, 2026 | Kang Sun | Common stock | D | 950,548 | $11.07 | 1,403,651 | D | S |
| 16 Jan, 2026 | Kang Sun | Common stock | A | 100,210 | $1.78 | 2,354,199 | D | M |
| 16 Jan, 2026 | Kang Sun | Common stock | A | 850,338 | $2.50 | 2,253,989 | D | M |
| 12 Jan, 2026 | Kang Sun | Common stock | A | 117,201 | $2.50 | 1,909,918 | D | M |
| 12 Jan, 2026 | Kang Sun | Common stock | A | 180,802 | $0.62 | 1,584,453 | D | M |