Steven Chu - 10 Mar 2026 Form 4 Insider Report for Amprius Technologies, Inc. (AMPX)

Reporting relationship: Director
Issuer ticker: AMPX
Reported as of: 10 Mar 2026
Net transaction value: -$5,863,984
SEC form: 4
Accepted by SEC: 12 Mar 2026, 19:25:27 UTC
Prior SEC filing: 17 Jun 2025
Next SEC filing: 16 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Ricardo C. Rodriguez, attorney-in-fact on behalf of Steven Chu

Key filing fact

Steven Chu filed Form 4 for Amprius Technologies, Inc. (AMPX) on 12 Mar 2026.

Key facts

This page summarizes Steven Chu's Form 4 filing for Amprius Technologies, Inc. (AMPX).
10 reported transactions and 3 derivative rows are listed below.
Accepted by SEC: 12 Mar 2026, 19:25.

Change

Previous filing in this sequence was filed on 17 Jun 2025.
Current net transaction value: -$5,863,984.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001296381 Primary reporting owner

Chu Steven

Relationship: Director
Address: C/O AMPRIUS TECHNOLOGIES, INC.,, 1180 PAGE AVENUE, FREMONT
Signature: /s/ Ricardo C. Rodriguez, attorney-in-fact on behalf of Steven Chu
Signature date: 12 Mar 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

AMPX transaction

Common stock

Options Exercise

Transaction value
Shares: +104,132
Change %: +55%
Price: $0.6200^*
Shares after: 293,971
Date: 10 Mar 2026
Ownership: Direct
Footnotes: F1

AMPX transaction

Common stock

Sale

Transaction value: $2,985,429
Shares: -166,632
Change %: -57%
Price: $17.92
Shares after: 127,339
Date: 10 Mar 2026
Ownership: Direct
Footnotes: F1, F2

AMPX transaction

Common stock

Options Exercise

Transaction value
Shares: +86,143
Change %: +68%
Price: $2.61^*
Shares after: 213,482
Date: 12 Mar 2026
Ownership: Direct
Footnotes: F1

AMPX transaction

Common stock

Options Exercise

Transaction value
Shares: +69,422
Change %: +33%
Price: $0.6200^*
Shares after: 282,904
Date: 12 Mar 2026
Ownership: Direct
Footnotes: F1

AMPX transaction

Common stock

Sale

Transaction value: $1,864,670
Shares: -100,000
Change %: -35%
Price: $18.65
Shares after: 182,904
Date: 12 Mar 2026
Ownership: Direct
Footnotes: F1, F3

AMPX transaction

Common stock

Sale

Transaction value: $910,740
Shares: -50,000
Change %: -27%
Price: $18.21
Shares after: 132,904
Date: 12 Mar 2026
Ownership: Direct
Footnotes: F1, F4

AMPX transaction

Common stock

Sale

Transaction value: $103,145
Shares: -5,565
Change %: -4.2%
Price: $18.53
Shares after: 127,339
Date: 12 Mar 2026
Ownership: Direct
Footnotes: F1, F5

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

AMPX transaction Derivative

Stock Option (right to buy)

Options Exercise

Transaction value
Shares: -104,132
Change %: -60%
Price: $0.6200^*
Shares after: 69,422
Date: 10 Mar 2026
Ownership: Direct
Underlying class: Common stock
Underlying amount: 104,132
Exercise price: $0.6200

AMPX transaction Derivative

Stock Option (right to buy)

Options Exercise

Transaction value
Shares: -86,143
Change %: -32%
Price: $2.61^*
Shares after: 184,108
Date: 12 Mar 2026
Ownership: Direct
Underlying class: Common stock
Underlying amount: 86,143
Exercise price: $2.61

AMPX transaction Derivative

Stock Option (right to buy)

Options Exercise

Transaction value
Shares: -69,422
Change %: -100%
Price: $0.6200^*
Shares after: 0
Date: 12 Mar 2026
Ownership: Direct
Underlying class: Common stock
Underlying amount: 69,422
Exercise price: $0.6200

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote F1

Includes 44,444 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.

Footnote F2

The price reported in Column 4 is an average execution price. These shares were sold in multiple transactions at prices ranging from $17.90 to $18.00, 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.

Footnote F3

The price reported in Column 4 is an average execution price. These shares were sold in multiple transactions at prices ranging from $18.60 to $18.78, 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.

Footnote F4

The price reported in Column 4 is an average execution price. These shares were sold in multiple transactions at prices ranging from $18.20 to $18.26, 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.

Footnote F5

The price reported in Column 4 is an average execution price. These shares were sold in multiple transactions at prices ranging from $18.50 to $18.61, 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.

SEC remarks

Exhibit 24-Power of Attorney