Amprius Technologies (AMPX) president awarded 200,000 restricted stock units

Rhea-AI Filing Summary

Amprius Technologies, Inc. disclosed that a director and officer serving as President received an equity award in the form of restricted stock units. On December 19, 2025, the reporting person acquired 200,000 shares of common stock at a price of $0, as noted in a footnote describing these shares as restricted stock units granted on that date, with a vesting commencement date of January 1, 2026.

Each restricted stock unit represents the right to receive one share of Amprius common stock. One quarter of the award will vest on February 20, 2027, and the remaining units will vest in equal quarterly installments over the following three years on May 20, August 20, November 20 and February 20, until fully vested on February 20, 2030, subject to continued service. After this transaction, the reporting person beneficially owns 610,000 shares, including 600,000 restricted stock units subject to their respective vesting schedules and conditions.

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^*

Stepien Thomas M

(Last) (First) (Middle)

1180 PAGE AVE.

(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)
	President

3. Date of Earliest Transaction (Month/Day/Year)
12/19/2025

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	12/19/2025		A		200,000(1)	A	$0	610,000(2)	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. The securities are represented by restricted stock units granted on December 19, 2025, with a vesting commencement date of January 1, 2026. Each restricted stock unit represents the reporting person's right to receive one share of the issuer's common stock. 1/4th of the restricted stock units subject to the award will vest on February 20, 2027 and the remainder will vest quarterly over three years thereafter, on each May 20, August 20, November 20 and February 20, subject to the reporting person's continued service on each such date, until the award is fully vested on February 20, 2030.

2. Includes 600,000 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:

Exhibit 24-Power of Attorney

	/s/ Ricardo C. Rodriguez, attorney-in-fact on behalf of Thomas M Stepien	12/22/2025
	** 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 insider transaction did Amprius Technologies (AMPX) report in this filing?

Amprius Technologies reported that a director and officer serving as President acquired 200,000 shares of common stock on December 19, 2025. These shares are described in a footnote as restricted stock units granted on that date, with no cash price paid (reported price of $0).

How many Amprius Technologies (AMPX) shares does the reporting person beneficially own after this transaction?

Following the reported transaction, the insider beneficially owns 610,000 shares of Amprius common stock, as disclosed in Table I. This total includes 600,000 restricted stock units, each representing a contingent right to receive one share of common stock, subject to applicable vesting schedules and conditions.

What are the vesting terms of the 200,000 restricted stock units at Amprius Technologies (AMPX)?

The 200,000 restricted stock units were granted on December 19, 2025 with a vesting commencement date of January 1, 2026. According to the explanation, 1/4 of the units will vest on February 20, 2027. The remaining units will vest quarterly over three years on May 20, August 20, November 20 and February 20, until the award is fully vested on February 20, 2030, subject to continued service.

How are the restricted stock units structured for the Amprius Technologies (AMPX) insider?

Each restricted stock unit granted to the insider represents the right to receive one share of Amprius common stock. The units are subject to service-based vesting, meaning the insider must continue in service through the specified vesting dates for the units to settle into shares, as described in the vesting schedule.

What roles does the reporting person hold at Amprius Technologies (AMPX)?

The reporting person is disclosed as both a Director and an Officer of Amprius Technologies, with the officer title listed as President. The form indicates it is filed by one reporting person.

Does this Amprius Technologies (AMPX) insider transaction involve direct or indirect ownership?

The filing identifies the 610,000 shares beneficially owned after the transaction as held with direct ownership, as shown in the ownership form column marked "D" in Table I.