X0508 4 2026-01-28 0 0001899287 Amprius Technologies, Inc. AMPX 0001940928 Stefan Constantin Ionel C/O AMPRIUS TECHNOLOGIES, INC., 1180 PAGE AVENUE FREMONT CA 94538 0 1 0 0 Chief Technology Officer 0 Common stock 2026-01-28 4 M 0 90 0.62 A 748786 D Common stock 2026-01-28 4 M 0 39600 0.05 A 788386 D Common stock 2026-01-28 4 S 0 39690 12.0018 D 748696 D Stock Option (right to buy) 0.62 2026-01-28 4 M 0 90 0 D 2024-10-23 2027-03-15 Common stock 90 0 D Stock Option (right to buy) 0.05 2026-01-28 4 M 0 39600 0 D 2022-09-14 2027-03-15 Common stock 39600 0 D 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 September 11, 2025. 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. The price reported in Column 4 is an average execution price. These shares were sold in multiple transactions at prices ranging from $12.00 to $12.02, 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. /s/ Ricardo C. Rodriguez, attorney-in-fact on behalf of Constantin Ionel Stefan 2026-01-30