Amprius Technologies, Inc. (AMPX) Insider Ownership

Historic Insider Ownership Trends

Amprius Technologies's three largest insider shareholders as of May 23, 2026 are Inc. Amprius, (TenPercentOwner, 2.50Mn shares), Justin E Mirro (Director, 2.39Mn shares), Kang Sun (Chief Executive Officer, 1.34Mn shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Kang Sun Chief Executive Officer 1,342,400 0 02 Apr, 2026
Livingston Satterthwaite - 336,083 0 17 Jun, 2025
Justin E Mirro - 0 2,393,042 25 Jul, 2024
Sandra Wallach Chief Financial Officer 1,005,275 0 25 Aug, 2025
Wen Hsuan Hsieh - 44,444 0 13 Mar, 2026
Ricardo C. Rodriguez Chief Financial Officer 350,000 0 13 Mar, 2026
Constantin Ionel Stefan Chief Technology Officer 833,330 0 06 Mar, 2026
Jonathan Bornstein President Of Amprius Lab 0 1,040,950 22 Nov, 2024
Inc. Amprius, - 2,500,071 0 25 Oct, 2024
Thomas M Stepien Chief Executive Officer 760,000 0 06 Mar, 2026

* 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
01 Apr, 2026 Kang Sun Common stock A 1,312,505 $1.78 2,654,905 D M
01 Apr, 2026 Kang Sun Common stock A 1,312,505 $1.78 2,654,905 D M
01 Apr, 2026 Kang Sun Common stock A 187,495 $3.68 2,842,400 D M
01 Apr, 2026 Kang Sun Common stock A 187,495 $3.68 2,842,400 D M
01 Apr, 2026 Kang Sun Common stock D 1,250,963 $15.73 1,591,437 D S
01 Apr, 2026 Kang Sun Common stock D 1,250,963 $15.73 1,591,437 D S
01 Apr, 2026 Kang Sun Common stock D 249,037 $16.78 1,342,400 D S
01 Apr, 2026 Kang Sun Common stock D 249,037 $16.78 1,342,400 D S
01 Apr, 2026 Kang Sun Stock Option (right to buy) D 1,312,505 $1.78 0 D M
01 Apr, 2026 Kang Sun Stock Option (right to buy) D 1,312,505 $1.78 0 D M
01 Apr, 2026 Kang Sun Stock Option (right to buy) D 187,495 $3.68 1,787,007 D M
01 Apr, 2026 Kang Sun Stock Option (right to buy) D 187,495 $3.68 1,787,007 D M
23 Mar, 2026 Kang Sun Common stock D 152,823 $18.69 121,452 I S
23 Mar, 2026 Kang Sun Common stock D 152,823 $18.69 121,452 I S
23 Mar, 2026 Kang Sun Common stock D 65,046 $19.06 56,406 I S
23 Mar, 2026 Kang Sun Common stock D 65,046 $19.06 56,406 I S
04 Mar, 2026 Ricardo C. Rodriguez Common stock A 150,000 $0.00 350,000 D A
12 Mar, 2026 Wen Hsuan Hsieh Common stock A 270,251 $2.61 457,590 D M
04 Mar, 2026 Ricardo C. Rodriguez Common stock A 150,000 $0.00 350,000 D A
12 Mar, 2026 Wen Hsuan Hsieh Common stock D 282,500 $18.55 175,090 D S