Amprius CEO granted 200,000 AMPX shares

Stepien Thomas M reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Stepien Thomas M reported acquisition or exercise transactions in this Form 4 filing.

Amprius Technologies, Inc. reported that Chief Executive Officer Thomas M. Stepien received a grant of 200,000 shares of common stock at a price of $0.00 per share as a compensation-related award. Following this grant, he directly holds 760,000 shares of Amprius common stock.

The amended filing clarifies the vesting schedule for the underlying restricted stock units. 2/16 of the shares will vest on May 20, 2026, and 1/16 will vest quarterly on each August 20, November 20, February 20, and May 20, subject to his continued service, until the award is fully vested on November 20, 2029.

Insider Trade Summary

Grant/Award: 200,000 shares

Grant/Award 1 txn

Insider Stepien Thomas M

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Grant/Award	Common stock	200,000	$0.00	$0.00

Holdings After Transaction: Common stock — 760,000 shares (Direct)

Footnotes (1)

1. F1. This Form 4/A is filed solely to correct the vesting schedule of the restricted stock units of the reporting person reported in the original filing. 2/16th of the shares subject to the award will vest on May 20, 2026 and 1/16th of the shares subject to the award will vest 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 November 20, 2029.

Key Figures

Shares granted: 200,000 shares Grant price: $0.00 per share Shares held after grant: 760,000 shares +3 more

6 metrics

Shares granted 200,000 shares Common stock grant at $0.00 per share

Grant price $0.00 per share Price per share for the CEO equity award

Shares held after grant 760,000 shares CEO direct holdings following the reported transaction

Initial vesting tranche 2/16 of award Vests on May 20, 2026, subject to continued service

Ongoing vesting tranches 1/16 quarterly Vests each Aug 20, Nov 20, Feb 20, May 20

Final vesting date November 20, 2029 Date the award becomes fully vested

Key Terms

Form 4/A, restricted stock units, vesting schedule, grant, award, or other acquisition

4 terms

Form 4/A regulatory

"This Form 4/A is filed solely to correct the vesting schedule"

Form 4/A is an amended filing that corrects or updates an earlier Form 4, the mandatory report that insiders (like company executives, directors, or large shareholders) must file when their ownership stakes change. Think of it as an edited receipt showing who bought or sold stock and when; investors use it to track insider confidence, detect potential conflicts, and spot trading patterns that might signal future company prospects.

restricted stock units financial

"correct the vesting schedule of the restricted stock units of the reporting person"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

vesting schedule financial

"filed solely to correct the vesting schedule of the restricted stock units"

A vesting schedule is a timeline that determines when someone gains full ownership of certain benefits, such as company stock or retirement contributions. Think of it like earning the right to own a gift gradually over time, rather than receiving it all at once. It matters to investors because it affects when they can fully access or sell these benefits, influencing their financial planning and decision-making.

grant, award, or other acquisition financial

"transaction_code_description": "Grant, award, or other acquisition""

FAQ

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

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

Amprius Technologies reported that CEO Thomas M. Stepien received a grant of 200,000 shares of common stock at $0.00 per share. This is a compensation-related award rather than an open-market purchase or sale, reflecting equity-based executive compensation.

How many Amprius (AMPX) shares does the CEO hold after this Form 4/A?

After the reported grant, CEO Thomas M. Stepien directly holds 760,000 shares of Amprius common stock. This figure comes from the Form 4/A and reflects his position following the 200,000-share award described in the filing.

What vesting schedule applies to the CEO’s Amprius restricted stock units?

The filing states that 2/16 of the shares subject to the award vest on May 20, 2026. Thereafter, 1/16 of the shares vest quarterly on August 20, November 20, February 20, and May 20 until full vesting on November 20, 2029, subject to continued service.

Why was this Amprius Technologies (AMPX) Form 4/A filed as an amendment?

The Form 4/A was filed solely to correct the vesting schedule for the CEO’s restricted stock units. It clarifies how the award vests over time, without changing the reported 200,000-share grant amount or his post-transaction holdings of 760,000 shares.

Is the CEO’s Amprius (AMPX) share grant an open-market transaction?

No. The filing identifies the 200,000-share transaction as a grant or award acquisition at $0.00 per share. This means it is a compensation-related equity award from the company, not an open-market buy or sell in the public market.

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

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Accepted by SEC EDGAR 05/07/2026 - 04:53 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^*

Stepien Thomas M

(Last) (First) (Middle)

1180 PAGE AVE.

(Street)

FREMONT CALIFORNIA 94538

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

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

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

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

4. If Amendment, Date of Original Filed (Month/Day/Year)
12/22/2025

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	760,000	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 Form 4/A is filed solely to correct the vesting schedule of the restricted stock units of the reporting person reported in the original filing. 2/16th of the shares subject to the award will vest on May 20, 2026 and 1/16th of the shares subject to the award will vest 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 November 20, 2029.

Remarks:

	/s/ Ricardo C. Rodriguez, attorney-in-fact on behalf of Thomas M Stepien	05/07/2026
	** 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.
* Form 4: SEC 1474 (03-26)