X0609 4 2026-04-01 0 0001899287 Amprius Technologies, Inc. AMPX 0001476220 Sun Kang false C/O AMPRIUS TECHNOLOGIES, INC., 1180 PAGE AVENUE FREMONT CA 94538 1 0 0 0 0 Common stock 2026-04-01 4 M 0 1312505 1.78 A 2654905 D Common stock 2026-04-01 4 M 0 187495 3.68 A 2842400 D Common stock 2026-04-01 4 S 0 1250963 15.7328 D 1591437 D Common stock 2026-04-01 4 S 0 249037 16.7829 D 1342400 D Common stock 56406 I See Footnote Stock Option (right to buy) 1.78 2026-04-01 4 M 0 1312505 1.78 D 2022-09-14 2031-06-16 Common stock 1312505 0 D Stock Option (right to buy) 3.68 2026-04-01 4 M 0 187495 3.68 D 2024-10-23 2031-12-15 Common stock 187495 1787007 D The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 18, 2025. Includes 1,159,385 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. The price reported in Column 4 is an average execution price. These shares were sold in multiple transactions at prices ranging from $15.37 to $16.36, 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. The price reported in Column 4 is an average execution price. These shares were sold in multiple transactions at prices ranging from $16.37 to $17.31, 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. These securities are held directly by the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST, for which the reporting person and his spouse are co-trustees. /s/ Ricardo C. Rodriguez, attorney-in-fact on behalf of Kang Sun 2026-04-02