Director Sun Kang sells 1.5M Amprius (AMPX) shares in 10b5-1 plan

Rhea-AI Filing Summary

Amprius Technologies director Sun Kang exercised stock options and sold shares in a pre-planned trade. On April 1, 2026, he exercised options for a total of 1,500,000 shares of common stock at strike prices of $1.78 and $3.68 per share, then sold 1,500,000 shares in open-market transactions at average prices of $15.7328 and $16.7829, with actual sale prices ranging from $15.37 to $17.31.

Following these transactions, he holds 1,342,400 shares directly and 56,406 shares indirectly through the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST. His holdings also include 1,159,385 restricted stock units, each representing a contingent right to one share. All reported trades were executed under a Rule 10b5-1 trading plan adopted on August 18, 2025, indicating they were pre-scheduled rather than discretionary.

Insights

Equity compensation and insider-trading specialist

Pre-planned option exercise and sale; net position remains sizable.

The filing shows Sun Kang exercising options for 1,500,000 shares at strike prices of $1.78 and $3.68, then selling 1,500,000 shares at average prices around $15.73 and $16.78. This is a classic exercise-and-sell pattern, converting option value into cash.

Importantly, the transactions were executed under a Rule 10b5-1 trading plan adopted on August 18, 2025, which means the timing was pre-arranged and not a reaction to recent information. After these trades, Kang still holds 1,342,400 shares directly, plus 56,406 indirectly through a family trust and 1,159,385 restricted stock units, so he maintains substantial exposure to Amprius Technologies.

Insider Trade Summary

Net Seller: 1,500,000 shares ($23,860,714)

Net Sell 7 txns

Insider Sun Kang

Role Director

Sold 1,500,000 shs ($23.86M)

Type	Security	Shares	Price	Value
Exercise	Stock Option (right to buy)	1,312,505	$1.78	$2.34M
Exercise	Stock Option (right to buy)	187,495	$3.68	$690K
Exercise	Common stock	1,312,505	$1.78	$2.34M
Exercise	Common stock	187,495	$3.68	$690K
Sale	Common stock	1,250,963	$15.7328	$19.68M
Sale	Common stock	249,037	$16.7829	$4.18M
holding	Common stock	--	--	--

Holdings After Transaction: Stock Option (right to buy) — 0 shares (Direct); Common stock — 2,654,905 shares (Direct); Common stock — 56,406 shares (Indirect, See Footnote)

Footnotes (1)

1. The transactions 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 1,159,385 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 $15.37 to $16.36, 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 $16.37 to $17.31, 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.

Key Figures

Options exercised: 1,500,000 shares Strike prices: $1.78 and $3.68 per share Shares sold: 1,500,000 shares +5 more

8 metrics

Options exercised 1,500,000 shares Total options exercised on April 1, 2026

Strike prices $1.78 and $3.68 per share Exercise prices of stock options

Shares sold 1,500,000 shares Total common shares sold in open market

Average sale prices $15.7328 and $16.7829 Average prices for two sale blocks

Direct holdings after trades 1,342,400 shares Common stock held directly post-transaction

Indirect holdings 56,406 shares Held by KANG & CECILLIA SUN FAMILY REVOCABLE TRUST

Restricted stock units 1,159,385 units RSUs each convertible into one common share

Net buy/sell direction 1,500,000 net shares sold transactionSummary netBuySellShares

Key Terms

Rule 10b5-1 trading plan, Stock Option (right to buy), restricted stock units, open-market sale, +1 more

5 terms

Rule 10b5-1 trading plan regulatory

"The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

Stock Option (right to buy) financial

"security_title: "Stock Option (right to buy)""

restricted stock units financial

"Includes 1,159,385 restricted stock units, each of which represents a contingent right"

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.

open-market sale financial

"transaction_action: "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

family revocable trust financial

"held directly by the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST, for which the reporting person"

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 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)
04/01/2026

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	04/01/2026		M(1)		1,312,505	A	$1.78	2,654,905(2)	D
Common stock	04/01/2026		M(1)		187,495	A	$3.68	2,842,400(2)	D
Common stock	04/01/2026		S(1)		1,250,963	D	$15.7328(3)	1,591,437(2)	D
Common stock	04/01/2026		S(1)		249,037	D	$16.7829(4)	1,342,400(2)	D
Common stock								56,406	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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (right to buy)	$1.78	04/01/2026		M(1)			1,312,505	09/14/2022	06/16/2031	Common stock	1,312,505	$1.78	0	D
Stock Option (right to buy)	$3.68	04/01/2026		M(1)			187,495	10/23/2024	12/15/2031	Common stock	187,495	$3.68	1,787,007	D

Explanation of Responses:

1. The transactions 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 1,159,385 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 $15.37 to $16.36, 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 $16.37 to $17.31, 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	04/02/2026
	** 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)

FAQ

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

Sun Kang exercised stock options for 1,500,000 Amprius shares, then sold 1,500,000 shares in open-market trades. The actions were executed under a pre-arranged Rule 10b5-1 trading plan adopted in August 2025, indicating routine portfolio management rather than ad hoc timing.

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

He sold 1,500,000 Amprius common shares in two blocks. One block of 1,250,963 shares averaged $15.7328 with prices from $15.37 to $16.36; another 249,037-share block averaged $16.7829 with prices from $16.37 to $17.31 across multiple trades.

What stock options did Sun Kang exercise in Amprius (AMPX)?

He exercised options covering 1,312,505 shares at a $1.78 strike and 187,495 shares at a $3.68 strike, totaling 1,500,000 shares. These exercises converted derivative awards into common stock, which was then sold in open-market transactions on the same date.

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

After the reported trades, Sun Kang directly holds 1,342,400 Amprius common shares. He also has indirect ownership of 56,406 shares through the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST, where he and his spouse serve as co-trustees, plus a large restricted stock unit position.

What is the significance of the Rule 10b5-1 trading plan in this Amprius (AMPX) Form 4?

The filing states all transactions were made under a Rule 10b5-1 plan adopted on August 18, 2025. Such plans pre-schedule trades, reducing the likelihood that sale timing reflects nonpublic information or short-term views, and often indicate routine diversification or liquidity management by insiders.

What restricted stock units does Sun Kang hold in Amprius (AMPX)?

He holds 1,159,385 restricted stock units, each representing a contingent right to receive one Amprius common share. These RSUs vest over time based on applicable schedules and conditions, meaning they may convert into additional shares in the future as those vesting requirements are satisfied.