Amprius (AMPX) CTO disposes 19,159 shares to cover RSU taxes at ~$6.82

Rhea-AI Filing Summary

Insider transaction summary: The Chief Technology Officer of Amprius Technologies, Inc. sold 19,159 shares of common stock on 08/21/2025 at an average price of $6.8162 per share. The filing states these sales were effected under non-discretionary, sell-to-cover arrangements required by the company to satisfy tax withholding obligations arising from the vesting of restricted stock units. After the reported disposition, the reporting person beneficially owns 846,975 shares, which include 637,953 restricted stock units that convert to one share each subject to vesting schedules. The Form 4 was signed on 08/25/2025.

Insights

Corporate Governance Expert

TL;DR: Routine sell-to-cover stock sales tied to RSU vesting; not indicative of discretionary insider trading.

The disclosure indicates the CTO executed a non-discretionary sell-to-cover to meet tax withholding when restricted stock units vested. Such transactions are common corporate practice to satisfy tax obligations and are typically pre-authorized or mandated by the issuer. The filing provides the number of shares sold, the average execution price range, and the sizeable RSU balance remaining, which underscores ongoing equity exposure aligned with employment incentives.

Securities Analyst

TL;DR: Insider sold 19,159 shares at ~$6.82 for tax withholding; substantial RSU holdings remain, leaving material ongoing equity exposure.

The reported average price of $6.8162 (range $6.78–$6.91) and the disposition of 19,159 shares reduced the reporting person's direct holdings to 846,975 shares, inclusive of 637,953 RSUs. The practitioner-disclosed sell-to-cover rationale limits interpretive risk about intentional liquidity-taking. The filing includes an offer to provide transaction-level detail upon request, which supports transparency for investors and regulators.

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

OMB APPROVAL

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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^*

Stefan Constantin Ionel

(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)

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

3. Date of Earliest Transaction (Month/Day/Year)
08/21/2025

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	08/21/2025		S(1)		19,159	D	$6.8162(2)	846,975(3)	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

Explanation of Responses:

1. This transaction was effected pursuant to non-discretionary, sell-to-cover arrangements mandated by the issuer to fund tax withholding obligations in connection with the vesting of restricted stock units.

2. The price reported in Column 4 is an average execution price. These shares were sold in multiple transactions at prices ranging from $6.78 to $6.91, 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. Includes 637,953 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.

Remarks:

	/s/ Sandra Wallach, attorney-in-fact on behalf of Constantin Ionel Stefan	08/25/2025
	** 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.
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FAQ

What did Amprius Technologies (AMPX) insider Constantin Ionel do on 08/21/2025?

The CTO sold 19,159 shares of common stock on 08/21/2025 at an average price of $6.8162 per share.

Why were the shares sold according to the Form 4 for AMPX?

The filing states the sales were non-discretionary sell-to-cover transactions mandated to fund tax withholding obligations from RSU vesting.

How many shares does the reporting person own after the transaction?

Following the reported transaction the reporting person beneficially owns 846,975 shares, which include 637,953 restricted stock units.

What price range were the shares sold at in the AMPX Form 4?

The filing reports an average price of $6.8162, with individual sale prices ranging from $6.78 to $6.91.

When was the Form 4 signed and filed?

The signature on the form is dated 08/25/2025 (signed by an attorney-in-fact on behalf of the reporting person).