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Amprius CEO Kang Sun files Form 4 for automatic share sale

Filing Impact
(Very High)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

Amprius Technologies (AMPX) CEO Kang Sun reported an automatic sale of company stock. On 11/21/2025, he disposed of 68,655 shares of Amprius common stock at an average price of $10.0813 per share in a transaction coded "S." The sale was carried out under a non-discretionary, sell-to-cover arrangement mandated by the company to fund tax withholding obligations tied to the vesting of restricted stock units, meaning the sale was for tax purposes rather than an open-market portfolio decision.

Following this transaction, Kang Sun beneficially owned 1,403,651 shares directly, which include 1,285,576 restricted stock units that may convert into common shares if vesting conditions are met. He also indirectly held 274,275 shares through the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST, where he and his spouse serve as co-trustees.

Positive

  • None.

Negative

  • None.
Insider Sun Kang
Role Chief Executive Officer
Sold 68,655 shs ($692K)
Type Security Shares Price Value
Sale Common stock 68,655 $10.0813 $692K
holding Common stock -- -- --
Holdings After Transaction: Common stock — 1,403,651 shares (Direct); Common stock — 274,275 shares (Indirect, See Footnote)
Footnotes (1)
  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. The price reported in Column 4 is an average execution price. These shares were sold in multiple transactions at prices ranging from $10.05 to $10.13, 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. 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. 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 →
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 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)
X Director 10% Owner
X Officer (give title below) Other (specify below)
Chief Executive Officer
3. Date of Earliest Transaction (Month/Day/Year)
11/21/2025
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 11/21/2025 S(1) 68,655 D $10.0813(2) 1,403,651(3) D
Common stock 274,275 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 $10.05 to $10.13, 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 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.
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 11/25/2025
** 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 insider transaction did Amprius Technologies (AMPX) report for CEO Kang Sun?

Amprius Technologies CEO Kang Sun reported the sale of 68,655 shares of common stock on 11/21/2025 in a transaction coded "S" on a Form 4.

At what price were the Amprius (AMPX) shares sold in Kang Sun's Form 4 filing?

The 68,655 shares of Amprius common stock were sold at an average price of $10.0813 per share, based on multiple trades between $10.05 and $10.13.

Why did Amprius CEO Kang Sun sell shares according to this Form 4?

The filing states the sale was made under non-discretionary, sell-to-cover arrangements mandated by the issuer to fund tax withholding obligations from the vesting of restricted stock units.

How many Amprius (AMPX) shares does Kang Sun own after the reported transaction?

After the transaction, Kang Sun beneficially owned 1,403,651 shares directly and 274,275 shares indirectly through the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST.

How many restricted stock units (RSUs) are included in Kang Sun's Amprius holdings?

The direct holdings include 1,285,576 restricted stock units, each representing a contingent right to receive one share of Amprius common stock, subject to vesting conditions.

What is the nature of Kang Sun's indirect ownership of Amprius (AMPX) shares?

The 274,275 indirectly held shares are owned by the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST, for which Kang Sun and his spouse serve as co-trustees.

What roles does Kang Sun hold at Amprius Technologies (AMPX)?

According to the filing, Kang Sun is both a Director and the Chief Executive Officer of Amprius Technologies, Inc.