Amprius CTO receives 110,000-share stock unit grant

Stefan Constantin Ionel reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Stefan Constantin Ionel reported acquisition or exercise transactions in this Form 4 filing.

Amprius Technologies, Inc. Chief Technology Officer Stefan Constantin Ionel reported an award of 110,000 shares of common stock in the form of restricted stock units at a price of $0.0000 per share. These RSUs vest 1/16 on May 20, 2026 and then quarterly on August 20, November 20, February 20 and May 20 until fully vested on February 20, 2030. Following this award, he directly holds 833,330 shares/units in total, including 643,440 restricted stock units subject to their respective vesting conditions.

Insider Trade Summary

Grant/Award: 110,000 shares

Grant/Award 1 txn

Insider Stefan Constantin Ionel

Role Chief Technology Officer

Type	Security	Shares	Price	Value
Grant/Award	Common stock	110,000	$0.00	$0.00

Holdings After Transaction: Common stock — 833,330 shares (Direct)

Footnotes (2)

1. F1. The securities are represented by restricted stock units. Each restricted stock unit represents the reporting person's right to receive one share of the issuer's common stock. 1/16th of shares subject to award will vest on May 20, 2026 and quarterly thereafter on each August 20, November 20, February 20 and May 20, subject to the reporting person's continued service on each such date, until the award is fully vested on February 20, 2030.
2. F2. Includes 643,440 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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Amprius (AMPX) report for its CTO?

Amprius reported its Chief Technology Officer received a 110,000-share restricted stock unit grant at $0.0000 per share. The award is a compensatory grant and increases his direct holdings to 833,330 shares and units combined, subject to applicable vesting schedules.

How do the new Amprius (AMPX) restricted stock units vest for the CTO?

The 110,000 restricted stock units vest over time. 1/16 of the award vests on May 20, 2026, then additional installments vest quarterly on August 20, November 20, February 20 and May 20 until the award fully vests on February 20, 2030.

What is the total Amprius (AMPX) share ownership now reported by the CTO?

After the award, the CTO reports direct ownership of 833,330 shares and units of Amprius common stock. This total includes 643,440 restricted stock units, each representing a contingent right to receive one share, subject to their individual vesting conditions and schedules.

What are restricted stock units in the Amprius (AMPX) Form 4 filing?

In this Form 4, restricted stock units are rights to receive one share of Amprius common stock per unit. They do not settle into shares until vesting conditions are met, tying executive compensation to continued service and the company’s long-term equity value performance.

Did the Amprius (AMPX) CTO pay cash for the 110,000 restricted stock units?

No cash changed hands for this grant. The 110,000 restricted stock units were awarded at a reported price of $0.0000 per share, reflecting an equity-based compensation award rather than an open-market purchase of Amprius common stock by the executive.

Over what period will the Amprius (AMPX) CTO’s new RSU award fully vest?

The award begins vesting on May 20, 2026 and continues quarterly. Vesting occurs each August 20, November 20, February 20 and May 20, with the restricted stock units scheduled to be fully vested by February 20, 2030, assuming continued service throughout.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 03/06/2026 - 05:46 PM Learn about SEC filing dates

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

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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)
03/04/2026

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	03/04/2026		A		110,000(1)	A	$0	833,330(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. Each restricted stock unit represents the reporting person's right to receive one share of the issuer's common stock. 1/16th of shares subject to award will vest on May 20, 2026 and quarterly thereafter on each August 20, November 20, February 20 and May 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 643,440 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/ Ricardo C. Rodriguez, attorney-in-fact on behalf of Constantin Ionel Stefan	03/06/2026
	** 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.