Kang Sun - 17 Nov 2025 Form 4 Insider Report for Amprius Technologies, Inc. (AMPX)

Role
Chief Executive Officer, Director
Signature
/s/ Ricardo C. Rodriguez, attorney-in-fact on behalf of Kang Sun
Issuer symbol
AMPX
Transactions as of
17 Nov 2025
Net transactions value
-$10,317,175
Form type
4
Filing time
19 Nov 2025, 17:49:54 UTC
Previous filing
25 Aug 2025
Next filing
25 Nov 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Sun Kang Chief Executive Officer, Director C/O AMPRIUS TECHNOLOGIES, INC.,, 1180 PAGE AVENUE, FREMONT /s/ Ricardo C. Rodriguez, attorney-in-fact on behalf of Kang Sun 19 Nov 2025 0001476220

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction AMPX Common stock Options Exercise $198,875 +202,934 +14% $0.9800 1,675,240 17 Nov 2025 Direct F1, F2
transaction AMPX Common stock Options Exercise $36,398 +727,950 +43% $0.0500 2,403,190 17 Nov 2025 Direct F1, F2
transaction AMPX Common stock Options Exercise $17,027 +27,463 +1.1% $0.6200 2,430,653 17 Nov 2025 Direct F1, F2
transaction AMPX Common stock Options Exercise $25,825 +41,653 +1.7% $0.6200 2,472,306 17 Nov 2025 Direct F1, F2
transaction AMPX Common stock Sale $10,595,300 -1,000,000 -40% $10.60 1,472,306 17 Nov 2025 Direct F1, F2, F3
holding AMPX Common stock 274,275 17 Nov 2025 See Footnote F4

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction AMPX Stock Option (right to buy) Options Exercise $0 -202,934 -100% $0.000000 0 17 Nov 2025 Common stock 202,934 $0.9800 Direct F1
transaction AMPX Stock Option (right to buy) Options Exercise $0 -727,950 -100% $0.000000 0 17 Nov 2025 Common stock 727,950 $0.0500 Direct F1
transaction AMPX Stock Option (right to buy) Options Exercise $0 -27,463 -13% $0.000000 180,802 17 Nov 2025 Common stock 27,463 $0.6200 Direct F1
transaction AMPX Stock Option (right to buy) Options Exercise $0 -41,653 -100% $0.000000 0 17 Nov 2025 Common stock 41,653 $0.6200 Direct F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The exercises and sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 18, 2025.
F2 Includes 1,411,769 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.
F3 The price reported in Column 4 is an average execution price. These shares were sold in multiple transactions at prices ranging from $10.19 to $11.30, 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.
F4 These securities are held directly by the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST, for which the reporting person and his spouse are co-trustees.

Remarks:

Exhibit 24-Power of Attorney