Amprius (NYSE: AMPX) director Kang Sun logs major option exercises and stock sales

Q: What did Amprius Technologies (AMPX) director Kang Sun report in this Form 4 filing?

The Form 4 shows that Kang Sun , a director of Amprius Technologies, Inc. (AMPX) , exercised stock options and sold shares of the company’s common stock on January 16, 2026 and January 20, 2026. These transactions involved both acquiring shares through option exercises and selling shares in the open market.

Q: How many Amprius (AMPX) shares did Kang Sun sell and at what prices?

On January 16, 2026, Kang Sun sold 950,548 shares of Amprius common stock at an average price of $11.0659 per share, with individual trades executed between $11.00 and $11.20. On January 20, 2026, he sold 43,185 shares at an average price of $11.0287 per share, with trades between $11.00 and $11.10.

Q: Were Kang Sun’s Amprius (AMPX) trades made under a Rule 10b5-1 trading plan?

Yes. The footnotes state that the exercises and sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Kang Sun on August 18, 2025. Rule 10b5-1 plans are pre-arranged trading programs designed to allow insiders to trade shares according to set instructions.

Q: What indirect Amprius (AMPX) holdings does the trust associated with Kang Sun report?

The Form 4 shows an indirect holding of 274,275 Amprius common shares held by the Kang & Cecillia Sun Family Revocable Trust . According to the footnote, Kang Sun and his spouse are co-trustees of this trust.

Filing Impact

(Very High)

Filing Sentiment

(Very Negative)

Form Type

Rhea-AI Filing Summary

Amprius Technologies director Kang Sun reported option exercises and share sales under a pre-arranged trading plan. On January 16, 2026, he exercised stock options for 850,338 shares at $2.5 per share and 100,210 shares at $1.78 per share, then sold 950,548 shares of common stock at an average price of $11.0659 per share. On January 20, 2026, he exercised options for 43,185 shares at $1.78 per share and sold the same number of shares at an average price of $11.0287 per share.

Following these transactions, Sun directly beneficially owned 1,403,651 shares of Amprius common stock, including 1,285,576 restricted stock units, and indirectly held 274,275 shares through the Kang & Cecillia Sun Family Revocable Trust, where he and his spouse are co-trustees. The filing states that the exercises and sales were effected pursuant to a Rule 10b5-1 trading plan adopted on August 18, 2025.

Insider Trade Summary

Net Seller: 993,733 shares ($10,994,944)

Net Sell 9 txns

Insider Sun Kang

Role Director

Sold 993,733 shs ($10.99M)

Type	Security	Shares	Price	Value
Exercise	Stock Option (right to buy)	43,185	$0.00	--
Exercise	Common stock	43,185	$1.78	$77K
Sale	Common stock	43,185	$11.0287	$476K
Exercise	Stock Option (right to buy)	850,338	$0.00	--
Exercise	Stock Option (right to buy)	100,210	$0.00	--
Exercise	Common stock	850,338	$2.50	$2.13M
Exercise	Common stock	100,210	$1.78	$178K
Sale	Common stock	950,548	$11.0659	$10.52M
holding	Common stock	--	--	--

Holdings After Transaction: Stock Option (right to buy) — 1,312,505 shares (Direct); Common stock — 1,446,836 shares (Direct); Common stock — 274,275 shares (Indirect, See Footnote)

Footnotes (1)

The exercises and sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 18, 2025. Includes 1,285,576 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. The price reported in Column 4 is an average execution price. These shares were sold in multiple transactions at prices ranging from $11.00 to $11.20, 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. The price reported in Column 4 is an average execution price. These shares were sold in multiple transactions at prices ranging from $11.00 to $11.10, 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. These securities are held directly by the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST, for which the reporting person and his spouse are co-trustees.

Form 4 Insider Transactions: What Each Field Means →

01/20/2026 - 05:33 PM

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

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
	Officer (give title below)	Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
01/16/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common stock	01/16/2026		M⁽¹⁾		850,338	A	$2.5	2,253,989⁽²⁾	D
Common stock	01/16/2026		M⁽¹⁾		100,210	A	$1.78	2,354,199⁽²⁾	D
Common stock	01/16/2026		S⁽¹⁾		950,548	D	$11.0659⁽³⁾	1,403,651⁽²⁾	D
Common stock	01/20/2026		M⁽¹⁾		43,185	A	$1.78	1,446,836⁽²⁾	D
Common stock	01/20/2026		S⁽¹⁾		43,185	D	$11.0287⁽⁴⁾	1,403,651⁽²⁾	D
Common stock								274,275	I	See Footnote⁽⁵⁾

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Stock Option (right to buy)	$2.5	01/16/2026		M⁽¹⁾			850,338	10/23/2024	09/17/2030	Common stock	850,338	$0	0	D
Stock Option (right to buy)	$1.78	01/16/2026		M⁽¹⁾			100,210	09/14/2022	06/16/2031	Common stock	100,210	$0	1,355,690	D
Stock Option (right to buy)	$1.78	01/20/2026		M⁽¹⁾			43,185	09/14/2022	06/16/2031	Common stock	43,185	$0	1,312,505	D

Explanation of Responses:

1. The exercises and sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 18, 2025.

2. Includes 1,285,576 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.

3. The price reported in Column 4 is an average execution price. These shares were sold in multiple transactions at prices ranging from $11.00 to $11.20, 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.

4. The price reported in Column 4 is an average execution price. These shares were sold in multiple transactions at prices ranging from $11.00 to $11.10, 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.

5. 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	01/20/2026
	** 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.

Source: View Original Filing on SEC EDGAR

FAQ

What did Amprius Technologies (AMPX) director Kang Sun report in this Form 4 filing?

The Form 4 shows that Kang Sun, a director of Amprius Technologies, Inc. (AMPX), exercised stock options and sold shares of the company’s common stock on January 16, 2026 and January 20, 2026. These transactions involved both acquiring shares through option exercises and selling shares in the open market.

How many Amprius (AMPX) shares did Kang Sun sell and at what prices?

On January 16, 2026, Kang Sun sold 950,548 shares of Amprius common stock at an average price of $11.0659 per share, with individual trades executed between $11.00 and $11.20. On January 20, 2026, he sold 43,185 shares at an average price of $11.0287 per share, with trades between $11.00 and $11.10.

What option exercises did Kang Sun report for Amprius Technologies (AMPX)?

The filing reports that on January 16, 2026, Kang Sun exercised stock options to acquire 850,338 shares of Amprius common stock at an exercise price of $2.5 per share and 100,210 shares at $1.78 per share. On January 20, 2026, he exercised options for an additional 43,185 shares at $1.78 per share.

How many Amprius (AMPX) shares does Kang Sun beneficially own after these transactions?

After the reported transactions, Kang Sun directly beneficially owned 1,403,651 shares of Amprius common stock, which includes 1,285,576 restricted stock units. He also indirectly held 274,275 shares through the Kang & Cecillia Sun Family Revocable Trust, for which he and his spouse serve as co-trustees.

Were Kang Sun’s Amprius (AMPX) trades made under a Rule 10b5-1 trading plan?

Yes. The footnotes state that the exercises and sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Kang Sun on August 18, 2025. Rule 10b5-1 plans are pre-arranged trading programs designed to allow insiders to trade shares according to set instructions.

What indirect Amprius (AMPX) holdings does the trust associated with Kang Sun report?

The Form 4 shows an indirect holding of 274,275 Amprius common shares held by the Kang & Cecillia Sun Family Revocable Trust. According to the footnote, Kang Sun and his spouse are co-trustees of this trust.