[Form 4] Amprius Technologies, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Amprius Technologies, Inc. (AMPX) filed a Form 4 reporting insider transactions by its Chief Executive Officer and director, Kang Sun, on 11/17/2025. Sun exercised multiple stock options for Amprius common stock at exercise prices of $0.98, $0.05, and $0.62 per share and then reported an open market sale of 1,000,000 shares at an average price of $10.5953 per share.

The filing states these option exercises and related sales were carried out under a Rule 10b5-1 trading plan adopted on August 18, 2025. After the reported transactions, Sun beneficially owned 1,472,306 shares directly, which includes 1,411,769 restricted stock units, and an additional 274,275 shares indirectly through a family trust where he and his spouse serve as co-trustees.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Sun Kang

(Last) (First) (Middle)

C/O AMPRIUS TECHNOLOGIES, INC.,

1180 PAGE AVENUE

(Street)

FREMONT CA 94538

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Amprius Technologies, Inc. [ AMPX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

3. Date of Earliest Transaction (Month/Day/Year)
11/17/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common stock	11/17/2025		M(1)		202,934	A	$0.98	1,675,240(2)	D
Common stock	11/17/2025		M(1)		727,950	A	$0.05	2,403,190(2)	D
Common stock	11/17/2025		M(1)		27,463	A	$0.62	2,430,653(2)	D
Common stock	11/17/2025		M(1)		41,653	A	$0.62	2,472,306(2)	D
Common stock	11/17/2025		S(1)		1,000,000	D	$10.5953(3)	1,472,306(2)	D
Common stock								274,275	I	See Footnote(4)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (right to buy)	$0.98	11/17/2025		M(1)			202,934	09/14/2022	12/14/2026	Common stock	202,934	$0	0	D
Stock Option (right to buy)	$0.05	11/17/2025		M(1)			727,950	09/14/2022	03/15/2027	Common stock	727,950	$0	0	D
Stock Option (right to buy)	$0.62	11/17/2025		M(1)			27,463	09/14/2022	12/12/2027	Common stock	27,463	$0	180,802	D
Stock Option (right to buy)	$0.62	11/17/2025		M(1)			41,653	09/14/2022	03/15/2027	Common stock	41,653	$0	0	D

Explanation of Responses:

1. 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.

2. 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.

3. 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.

4. 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

	/s/ Ricardo C. Rodriguez, attorney-in-fact on behalf of Kang Sun	11/19/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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