Amprius director sells 62K shares for tax bill

Amprius Technologies, Inc. (AMPX) director Sun Kang reported a sale of 62,101 shares of common stock on August 21, 2026.

Rhea-AI Filing Summary

Amprius Technologies, Inc. (AMPX) director Sun Kang reported a sale of 62,101 shares of common stock on August 21, 2026. The transaction was effected pursuant to non-discretionary, issuer-mandated sell-to-cover arrangements to fund tax withholding obligations upon vesting of restricted stock units. The average execution price was $10.341 per share, with actual sale prices ranging from $10.10 to $10.48. Following this transaction, Kang directly held 1,218,397 shares, including 911,688 restricted stock units, and indirectly held 56,406 shares through the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST, for which he and his spouse are co-trustees.

Insider Trade Summary

Net Seller: 62,101 shares

Net Sell 2 txns

Insider Sun Kang

Role Director

Sold 62,101 shs ($642K)

Type	Security	Shares	Price	Value
Sale	Common stock F1, F2, F3	62,101	$10.341	$642K
holding	Common stock F4	--	--	--

Holdings After Transaction: Common stock — 1,218,397 shares (Direct); Common stock — 56,406 shares (Indirect, See Footnote)

Footnotes (4)

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 $10.10 to $10.48, 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 911,688 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.
4. F4. These securities are held directly by the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST, for which the reporting person and his spouse are co-trustees.

Key Figures

Shares sold: 62,101 shares of common stock Average execution price: $10.341 per share Sale price range: $10.10 to $10.48 per share +3 more

6 metrics

Shares sold 62,101 shares of common stock Sale on August 21, 2026 to fund tax withholding via sell-to-cover

Average execution price $10.341 per share Average price for the 62,101 shares sold

Sale price range $10.10 to $10.48 per share Range of prices for multiple sale transactions on August 21, 2026

Direct holdings after transaction 1,218,397 shares Total direct common stock holdings following the reported sale

Restricted stock units included 911,688 restricted stock units RSUs included within the direct holdings after the transaction

Indirect holdings after transaction 56,406 shares Shares held by the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST

Key Terms

sell-to-cover arrangements, restricted stock units, non-discretionary, revocable trust

4 terms

sell-to-cover arrangements financial

"transaction was effected pursuant to non-discretionary, sell-to-cover arrangements"

restricted stock units financial

"vesting of restricted stock units"

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

"transaction was effected pursuant to non-discretionary, sell-to-cover arrangements"

revocable trust financial

"held directly by the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST"

A revocable trust is a legal arrangement where the person who creates it keeps control and can change or cancel the trust at any time, while naming who will manage and receive the assets later. Think of it like a flexible folder for your investments and property that can be relabeled or reworked as circumstances change; it matters to investors because it determines how ownership is recorded, how easily assets transfer on incapacity or death, and whether holdings bypass public probate proceedings.

FAQ

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

What insider transaction did AMPX director Sun Kang report on this Form 4?

Sun Kang reported a sale of 62,101 shares of Amprius Technologies, Inc. common stock on August 21, 2026. The filing states the sale was made under non-discretionary, issuer-mandated sell-to-cover arrangements to satisfy tax withholding obligations related to vesting restricted stock units.

What was the sale price range for the AMPX shares sold by Sun Kang?

The filing reports an average execution price of $10.341 per share, with the sale prices ranging from $10.10 to $10.48 per share, inclusive. The Form 4 notes that the shares were sold in multiple transactions within this price range.

How many AMPX shares does Sun Kang hold after this reported transaction?

After the transaction, Sun Kang directly held 1,218,397 shares of Amprius Technologies, Inc. common stock, which includes 911,688 restricted stock units. In addition, he indirectly held 56,406 shares through the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST.

Were the AMPX share sales by Sun Kang discretionary trades?

The Form 4 states that the sale was effected under non-discretionary, sell-to-cover arrangements mandated by the issuer. These arrangements were used to fund tax withholding obligations arising from the vesting of restricted stock units.

How many restricted stock units in AMPX does Sun Kang have after the transaction?

The filing states that Sun Kang’s direct holdings include 911,688 restricted stock units. Each restricted stock unit represents a contingent right to receive one share of Amprius Technologies, Inc. common stock, subject to the applicable vesting schedule and conditions.

How are some of Sun Kang’s AMPX shares held indirectly?

According to the filing, 56,406 shares are held indirectly by the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST. Sun Kang and his spouse serve as co-trustees of this trust, and these holdings are reported as indirect ownership.

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

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Available on EDGAR 08/25/2026 - 05:23 PM EDT Accepted by SEC EDGAR 08/25/2026 - 05:22 PM EDT 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^*

Sun Kang

(Last) (First) (Middle)

C/O AMPRIUS TECHNOLOGIES, INC.,

1180 PAGE AVENUE

(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
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/21/2026

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	08/21/2026		S(1)		62,101	D	$10.341(2)	1,218,397(3)	D
Common stock								56,406	I	See Footnote(4)

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 $10.10 to $10.48, 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 911,688 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.

4. These securities are held directly by the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST, for which the reporting person and his spouse are co-trustees.

Remarks:

	/s/ Ricardo C. Rodriguez, attorney-in-fact on behalf of Kang Sun	08/25/2026
	** 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)