Kang Sun - 16 Jan 2026 Form 4 Insider Report for Amprius Technologies, Inc. (AMPX)

Role
Director
Signature
/s/ Ricardo C. Rodriguez, attorney-in-fact on behalf of Kang Sun
Issuer symbol
AMPX
Transactions as of
16 Jan 2026
Net transactions value
-$8,613,855
Form type
4
Filing time
20 Jan 2026, 17:33:00 UTC
Previous filing
14 Jan 2026
Next filing
24 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Sun Kang Director C/O AMPRIUS TECHNOLOGIES, INC.,, 1180 PAGE AVENUE, FREMONT /s/ Ricardo C. Rodriguez, attorney-in-fact on behalf of Kang Sun 20 Jan 2026 0001476220

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction AMPX Common stock Options Exercise $2,125,845 +850,338 +61% $2.50 2,253,989 16 Jan 2026 Direct F1, F2
transaction AMPX Common stock Options Exercise $178,374 +100,210 +4.4% $1.78 2,354,199 16 Jan 2026 Direct F1, F2
transaction AMPX Common stock Sale $10,518,669 -950,548 -40% $11.07 1,403,651 16 Jan 2026 Direct F1, F2, F3
transaction AMPX Common stock Options Exercise $76,869 +43,185 +3.1% $1.78 1,446,836 20 Jan 2026 Direct F1, F2
transaction AMPX Common stock Sale $476,274 -43,185 -3% $11.03 1,403,651 20 Jan 2026 Direct F1, F2, F4
holding AMPX Common stock 274,275 16 Jan 2026 See Footnote F5

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 -850,338 -100% $0.000000 0 16 Jan 2026 Common stock 850,338 $2.50 Direct F1
transaction AMPX Stock Option (right to buy) Options Exercise $0 -100,210 -6.9% $0.000000 1,355,690 16 Jan 2026 Common stock 100,210 $1.78 Direct F1
transaction AMPX Stock Option (right to buy) Options Exercise $0 -43,185 -3.2% $0.000000 1,312,505 20 Jan 2026 Common stock 43,185 $1.78 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 1,285,576 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 $11.00 to $11.20, 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 The price reported in Column 4 is an average execution price. These shares were sold in multiple transactions at prices ranging from $11.00 to $11.10, 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.
F5 These securities are held directly by the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST, for which the reporting person and his spouse are co-trustees.