Constantin Ionel Stefan - Nov 21, 2025 Form 4 Insider Report for Amprius Technologies, Inc. (AMPX)

Signature
/s/ Ricardo C. Rodriguez, attorney-in-fact on behalf of Constantin Ionel Stefan
Stock symbol
AMPX
Transactions as of
Nov 21, 2025
Transactions value $
-$252,274
Form type
4
Date filed
11/25/2025, 06:55 PM
Previous filing
Aug 25, 2025

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Stefan Constantin Ionel Chief Technology Officer C/O AMPRIUS TECHNOLOGIES, INC.,, 1180 PAGE AVENUE, FREMONT /s/ Ricardo C. Rodriguez, attorney-in-fact on behalf of Constantin Ionel Stefan 2025-11-25 0001940928

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction AMPX Common stock Sale -$252K -25K -2.95% $10.08 822K Nov 21, 2025 Direct F1, F2, F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 This transaction was effected pursuant to non-discretionary, sell-to-cover arrangements mandated by the issuer to fund tax withholding obligations in connection with the vesting of restricted stock units.
F2 The price reported in Column 4 is an average execution price. These shares were sold in multiple transactions at prices ranging from $10.05 to $10.13, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.
F3 Includes 585,697 restricted stock units, each of which represents a contingent right to receive one share of the issuer's common stock, subject to the applicable vesting schedule and conditions of each restricted stock unit.

Remarks:

Exhibit 24-Power of Attorney