Amprius Technologies (AMPX) director exercises options and sells common shares

Rhea-AI Filing Summary

Amprius Technologies director Wen Hsuan Hsieh reported an exercise-and-sell transaction in company stock. Hsieh exercised stock options for 270,251 shares of common stock at $2.61 per share, converting a derivative award into directly held shares.

On the same date, Hsieh then sold 282,500 shares of common stock at an average price of $18.546 per share and a further 130,646 shares at an average price of $18.2232 per share in open-market transactions. After these trades, Hsieh reported ownership of 44,444 shares, all in the form of restricted stock units that represent the right to receive common shares if vesting conditions are met.

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^*

HSIEH Wen Hsuan

(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
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
03/12/2026

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	03/12/2026		M		270,251	A	$2.61	457,590(1)	D
Common stock	03/12/2026		S		282,500	D	$18.546(2)	175,090(1)	D
Common stock	03/12/2026		S		130,646	D	$18.2232(3)	44,444(1)	D

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)	$2.61	03/12/2026		M			270,251	09/14/2022	04/13/2032	Common stock	270,251	$2.61	0	D

Explanation of Responses:

1. Includes 44,444 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.

2. The price reported in Column 4 is an average execution price. These shares were sold in multiple transactions at prices ranging from $18.45 to $18.78, 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.

3. The price reported in Column 4 is an average execution price. These shares were sold in multiple transactions at prices ranging from $18.12 to $18.39, 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.

Remarks:

Exhibit 24-Power of Attorney

	/s/Ricardo C. Rodriguez, attorney-in-fact on behalf of Wen Hsieh	03/13/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transactions did AMPX director Wen Hsuan Hsieh report?

Director Wen Hsuan Hsieh exercised options for 270,251 Amprius Technologies shares, then sold 282,500 and 130,646 common shares in separate open-market transactions. These trades converted an option award into stock and then reduced his directly held common share position.

How many Amprius Technologies (AMPX) shares did the director sell?

Hsieh reported selling 282,500 Amprius Technologies common shares at an average price of $18.546 and another 130,646 shares at an average price of $18.2232. Both transactions were coded as open-market or private sales under SEC transaction code S.

What stock options did the AMPX director exercise in this Form 4?

Hsieh exercised a stock option for 270,251 shares of Amprius Technologies common stock at an exercise price of $2.61 per share. The option, originally exercisable from April 2022 and expiring in April 2032, was fully converted, leaving no remaining derivative position reported.

What are the director’s remaining Amprius Technologies (AMPX) holdings after these trades?

Following the reported transactions, Hsieh listed beneficial ownership of 44,444 Amprius Technologies shares. These are restricted stock units, each representing a contingent right to receive one common share if the applicable vesting schedule and conditions for the award are satisfied over time.

Were the Amprius Technologies (AMPX) insider sales made in multiple trades?

Yes. The Form 4 states the reported average prices reflect multiple executions. One sale ranged from $18.45 to $18.78 per share, and the other from $18.12 to $18.39. The insider offered to provide detailed trade-by-trade pricing information upon request.

Does the AMPX director still hold stock options after this Form 4?

The filing shows Hsieh exercised 270,251 stock options and reports zero derivative securities remaining afterward. Combined with an empty derivative position summary, this indicates the reported option grant was fully exercised in this transaction sequence.