Amprius Technologies, Inc. (AMPX) Insider Ownership

Historic Insider Ownership Trends

Through the 90-day period concluding February 19, 2026, Amprius Technologies's top three insider stakeholders include TenPercentOwner Inc. Amprius, (2.50Mn shares), President Of Amprius Lab Jonathan Bornstein (1.46Mn shares), Director Kang Sun (1.40Mn shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
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.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
28 Jan, 2026 Constantin Ionel Stefan Common stock A 39,600 $0.05 788,386 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 90 $0.62 748,786 D M
23 Jan, 2026 Constantin Ionel Stefan Common stock D 1,600 $12.00 748,696 D S
23 Jan, 2026 Constantin Ionel Stefan Common stock A 1,600 $0.05 750,296 D M
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 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 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 15,834 $0.05 806,093 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 15,883 $0.05 821,976 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 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
16 Jan, 2026 Kang Sun Common stock D 950,548 $11.07 1,403,651 D S
12 Jan, 2026 Kang Sun Common stock A 180,802 $0.62 1,584,453 D M
12 Jan, 2026 Kang Sun Common stock A 117,201 $2.50 1,909,918 D M