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  4. [Form 4] Amprius Technologies, Inc. Insider Trading Activity

Sun Kang trades options, sells 506,267 Amprius Technologies (AMPX) shares

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

Rhea-AI Filing Summary

Amprius Technologies director Sun Kang reported multiple option exercises and a share sale. On January 12, 2026, he exercised three stock option grants for 180,802 shares at $0.62, 208,264 shares at $2.44, and 117,201 shares at $2.50 per share, receiving the same number of common shares in each case. He then sold 506,267 shares of common stock at an average price of $10.0964 under a Rule 10b5-1 trading plan adopted on August 18, 2025.

After these transactions, Sun directly beneficially owned 1,403,651 shares of common stock, which includes 1,285,576 restricted stock units, and held 850,338 stock options directly. In addition, 274,275 shares are held indirectly by the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST, for which he and his spouse serve as co-trustees.

Positive

  • None.

Negative

  • None.
Insider Sun Kang
Role Director
Sold 506,267 shs ($5.11M)
Type Security Shares Price Value
Exercise Stock Option (right to buy) 180,802 $0.00 --
Exercise Stock Option (right to buy) 208,264 $0.00 --
Exercise Stock Option (right to buy) 117,201 $0.00 --
Exercise Common stock 180,802 $0.62 $112K
Exercise Common stock 208,264 $2.44 $508K
Exercise Common stock 117,201 $2.50 $293K
Sale Common stock 506,267 $10.0964 $5.11M
holding Common stock -- -- --
Holdings After Transaction: Stock Option (right to buy) — 0 shares (Direct); Common stock — 1,584,453 shares (Direct); Common stock — 274,275 shares (Indirect, See Footnote)
Footnotes (1)
  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 $10.00 to $10.25, 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 →
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
Officer (give title below) Other (specify below)
3. Date of Earliest Transaction (Month/Day/Year)
01/12/2026
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)
Code V Amount (A) or (D) Price
Common stock 01/12/2026 M(1) 180,802 A $0.62 1,584,453(2) D
Common stock 01/12/2026 M(1) 208,264 A $2.44 1,792,717(2) D
Common stock 01/12/2026 M(1) 117,201 A $2.5 1,909,918(2) D
Common stock 01/12/2026 S(1) 506,267 D $10.0964(3) 1,403,651(2) 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
Stock Option (right to buy) $0.62 01/12/2026 M(1) 180,802 09/14/2022 12/12/2027 Common stock 180,802 $0 0 D
Stock Option (right to buy) $2.44 01/12/2026 M(1) 208,264 10/23/2024 01/02/2029 Common stock 208,264 $0 0 D
Stock Option (right to buy) $2.5 01/12/2026 M(1) 117,201 10/23/2024 09/17/2030 Common stock 117,201 $0 850,338 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 $10.00 to $10.25, 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. 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 01/14/2026
** 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 insider transactions did Amprius Technologies (AMPX) director Sun Kang report?

Sun Kang reported exercising three stock option grants on January 12, 2026 for 180,802, 208,264, and 117,201 shares of Amprius Technologies common stock, and selling 506,267 shares of common stock.

At what prices did Sun Kang exercise and sell Amprius Technologies (AMPX) shares?

He exercised options at $0.62, $2.44, and $2.50 per share, and sold 506,267 common shares at an average price of $10.0964, with individual trades ranging from $10.00 to $10.25 per share.

How many Amprius Technologies (AMPX) shares does Sun Kang own after the reported Form 4 transactions?

Following the transactions, Sun Kang directly beneficially owned 1,403,651 shares of common stock, including 1,285,576 restricted stock units, and indirectly held 274,275 shares through the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST.

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

Yes. The filing states that the option exercises and share sales were effected pursuant to a Rule 10b5-1 trading plan adopted by Sun Kang on August 18, 2025.

What stock options in Amprius Technologies (AMPX) does Sun Kang still hold after these trades?

After exercising several grants, Sun Kang beneficially owned 850,338 stock options (rights to buy common stock) directly as of the reported date.

How are some of Sun Kang’s Amprius Technologies (AMPX) shares held indirectly?

The Form 4 notes that 274,275 shares are held by the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST, for which Sun Kang and his spouse are co-trustees.