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Amprius Technologies, Inc.

AMPX Net selling

CIK 0001899287 #2254 in the set updated 17 Sep 2026

Bought (12 mo)

$0.00

out of their own pocket, the only kind of buying there is

Sold (12 mo)

$85.68M

$0.00 on a plan · $73.44M straight out of an exercise

Sold at will

$12.24M

20 of 37 sales

Net

−$85.68M

−$12.24M against sales at will

By person

12 insiders · 37 transactions

19.3×

Thomas M. Stepien holds 19.3 times base salary in stock. $6.18M of shares against $319.71K in salary for 2025.

Salary from the company's own proxy. The shares are what Thomas M. Stepien last reported holding, valued at $10.03, the price Common stock was last bought or sold at on the open market here, on 24 Aug 2026.

Insider

Role

Bought

Sold

Net

Holding

Of company

Worth

Change

Sun Kang

Director

—

$57.62M (13) scheduled

−$57.62M

1,274,803

0.8727%

$12.79M

−5.6%

Stefan Constantin Ionel

Chief Technology Officer

—

$10.69M (10) scheduled

−$10.69M

771,629

0.5282%

$7.74M

+75.7%

HSIEH Wen Hsuan

Director

—

$7.62M (2) scheduled

−$7.62M

44,444

0.0304%

$445.77K

−68.9%

Chu Steven

Director

—

$5.86M (4) scheduled

−$5.86M

137,762

0.0943%

$1.38M

−5.2%

DIXON DONALD R

Director

—

$2.54M (3)

−$2.54M

639,459

0.4377%

$6.41M

−12.1%

Stepien Thomas M

Chief Executive Officer

—

$1.34M (5)

−$1.34M

616,010

0.4217%

$6.18M

+6,060%

Amprius, Inc. entity

10% owner

—

2,500,071

1.71%

$25.08M

−96.2%

Bornstein Jonathan

President of Amprius Lab

—

1,463,618

1.00%

$14.68M

−10.8%

Wallach Sandra

Chief Financial Officer

—

1,005,275

0.6882%

$10.08M

+40.9%

RODRIGUEZ RICARDO C.

Chief Financial Officer

—

350,000

0.2396%

$3.51M

—

SATTERTHWAITE LIVINGSTON

Director

—

346,506

0.2372%

$3.48M

+18.8%

BAYLESS KATHLEEN A

Director

—

216,120

0.1479%

$2.17M

+34.0%

Individual transactions

Nothing of that kind in this period.

What was left out

Form 4 filings counted 36

Amendments (4/A) skipped 2

Filings about a different issuer 0

Unreadable filings 0

Joint filings 0

Sales on a Rule 10b5-1 plan 0

Sales straight out of an exercise 17

Sales at will 20

Transactions with no price 0

Shares from compensation/vesting 6,240,191

History held since 16 Sep 2022