Amprius CEO sells 4,375 shares for tax withholding

Amprius Technologies, Inc. Chief Executive Officer Thomas M. Stepien reported an open-market sale of 4,375 shares of common stock at an average price of $17.1935 per share.

Rhea-AI Filing Summary

Amprius Technologies, Inc. Chief Executive Officer Thomas M. Stepien reported an open-market sale of 4,375 shares of common stock at an average price of $17.1935 per share. According to the disclosure, this was a non-discretionary sell-to-cover transaction mandated by the company to fund tax withholding tied to vesting restricted stock units. After the sale, Stepien directly holds 694,923 shares, which the filing notes include 615,625 restricted stock units that may convert into common shares as their vesting conditions are met.

Insider Trade Summary

Net Seller: 4,375 shares

Net Sell 1 txn

Insider Stepien Thomas M

Role Chief Executive Officer

Sold 4,375 shs ($75K)

Type	Security	Shares	Price	Value
Sale	Common stock	4,375	$17.1935	$75K

Holdings After Transaction: Common stock — 694,923 shares (Direct)

Footnotes (3)

1. F1. 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. F2. The price reported in Column 4 is an average execution price. These shares were sold in multiple transactions at prices ranging from $17.13 to $17.3, 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. F3. Includes 615,625 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.

Key Figures

Shares sold: 4,375 shares Average sale price: $17.1935 per share Post-transaction holdings: 694,923 shares +2 more

5 metrics

Shares sold 4,375 shares Open-market sale on 2026-05-27 to fund tax withholding

Average sale price $17.1935 per share Reported average execution price for the 4,375 shares sold

Post-transaction holdings 694,923 shares Shares directly held by CEO after the transaction

Restricted stock units held 615,625 RSUs Each RSU represents a contingent right to one common share

Sale price range $17.13 to $17.30 Range of individual execution prices for the sold shares

Key Terms

sell-to-cover, restricted stock units, non-discretionary, tax withholding obligations, +1 more

5 terms

sell-to-cover financial

"non-discretionary, sell-to-cover arrangements mandated by the issuer to fund tax withholding obligations"

Sell-to-cover is when part of newly issued or exercised company stock is immediately sold to pay required taxes and fees, so the recipient keeps the remaining shares. For investors this matters because it reduces the number of shares insiders or employees actually hold after a grant, can create small, routine share sales that aren’t signal of cashing out, and slightly increases share supply on the market—like selling a portion of a paycheck to cover the tax bill.

restricted stock units financial

"Includes 615,625 restricted stock units, each of which represents a contingent right to receive one share"

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.

non-discretionary financial

"This transaction was effected pursuant to non-discretionary, sell-to-cover arrangements mandated by the issuer"

tax withholding obligations financial

"mandated by the issuer to fund tax withholding obligations in connection with the vesting of restricted stock units"

average execution price financial

"The price reported in Column 4 is an average execution price"

FAQ

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

What did Amprius Technologies (AMPX) CEO Thomas Stepien report in this Form 4?

Amprius Technologies CEO Thomas Stepien reported selling 4,375 common shares at an average price of $17.1935. The transaction was described as a mandated, non-discretionary sell-to-cover to fund tax withholding on vesting restricted stock units.

How many Amprius Technologies (AMPX) shares did the CEO sell and at what price?

The CEO sold 4,375 shares of Amprius Technologies common stock at an average price of $17.1935 per share. A footnote explains the shares were sold in multiple trades between $17.13 and $17.30 per share, with full trade details available on request.

Was the Amprius Technologies (AMPX) CEO’s sale a discretionary trade?

The sale was described as non-discretionary, executed under sell-to-cover arrangements mandated by Amprius Technologies. These arrangements funded tax withholding obligations arising from the vesting of restricted stock units, indicating a routine tax-related transaction rather than a voluntary open-market liquidation.

How many Amprius Technologies (AMPX) shares does the CEO hold after this transaction?

Following the reported sale, the CEO directly holds 694,923 shares of Amprius Technologies common stock. This amount includes 615,625 restricted stock units, each representing a contingent right to receive one share subject to applicable vesting schedules and conditions disclosed in the filing.

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

The filing states the CEO holds 615,625 restricted stock units, each tied to one Amprius Technologies common share. These RSUs represent contingent rights that may settle in shares over time, depending on meeting specified vesting schedules and conditions set by the company’s equity plan.

How significant is the CEO’s 4,375-share sale relative to his Amprius Technologies (AMPX) holdings?

After the transaction, the CEO holds 694,923 shares, so the 4,375 shares sold represent a small portion of his reported position. The sale is also described as a mandated sell-to-cover for taxes, suggesting a routine administrative event rather than a large discretionary reduction.

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

Form 4 Insider Transactions: What Each Field Means →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Accepted by SEC EDGAR 05/28/2026 - 06:22 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)
05/27/2026

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)

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	05/27/2026		S(1)		4,375	D	$17.1935(2)	694,923(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 $17.13 to $17.3, 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 615,625 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 Thomas M Stepien	05/28/2026
	** 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)