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Amprius Technologies, Inc.

AMPX Net selling
CIK 0001899287 #2254 in the set updated 17 Sep 2026
Bought (120 mo)
$0.00
out of their own pocket, the only kind of buying there is
Sold (120 mo)
$98.48M
$0.00 on a plan · $77.87M straight out of an exercise
Sold at will
$20.62M
87 of 122 sales
Net
−$98.48M
−$20.62M against sales at will

By person

15 insiders · 127 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
—
$58.50M (20) scheduled
−$58.50M
1,274,803
0.8727%
$12.79M
—
Stefan Constantin Ionel
Chief Technology Officer
—
$11.24M (19) scheduled
−$11.24M
771,629
0.5282%
$7.74M
+1,357%
HSIEH Wen Hsuan
Director
—
$7.62M (2) scheduled
−$7.62M
44,444
0.0304%
$445.77K
—
Chu Steven
Director
—
$5.86M (4) scheduled
−$5.86M
137,762
0.0943%
$1.38M
+5,410%
MIRRO JUSTIN E
Director
—
$5.06M (32)
−$5.06M
1,337,895
0.9159%
$13.42M
+12.0%
Bornstein Jonathan
President of Amprius Lab
—
$4.84M (25) scheduled
−$4.84M
1,463,618
1.00%
$14.68M
+1,205%
DIXON DONALD R
Director
—
$2.54M (3)
−$2.54M
639,459
0.4377%
$6.41M
+9.4%
Stepien Thomas M
Chief Executive Officer
—
$1.34M (5)
−$1.34M
616,010
0.4217%
$6.18M
+6,060%
Amprius, Inc. entity
10% owner
—
$1.09M (5)
−$1.09M
2,500,071
1.71%
$25.08M
−96.2%
Wallach Sandra
Chief Financial Officer
—
$394.67K (7)
−$394.67K
1,005,275
0.6882%
$10.08M
—
RODRIGUEZ RICARDO C.
Chief Financial Officer
—
—
—
350,000
0.2396%
$3.51M
—
SATTERTHWAITE LIVINGSTON
Director
—
—
—
346,506
0.2372%
$3.48M
+3,920%
BAYLESS KATHLEEN A
Director
—
—
—
216,120
0.1479%
$2.17M
—
Gustanski Mary
Director
—
—
—
146,396
0.1002%
$1.47M
—
Kensington Capital Sponsor IV LLC entity
Former 10% holder (see ftn 2)
—
—
—
0
0.0000%
$0.00
−100.0%

Individual transactions

35
Insider
Date
Role
Action
Shares
Price
Amount
Sun Kang
1 Apr 2026
Director
Sold after exercise
249,037
$16.78
$4.18M
Sun Kang
1 Apr 2026
Director
Sold after exercise
1,250,963
$15.73
$19.68M
Chu Steven
12 Mar 2026
Director
Sold after exercise
5,565
$18.53
$103.15K
Chu Steven
12 Mar 2026
Director
Sold after exercise
50,000
$18.21
$910.74K
Chu Steven
12 Mar 2026
Director
Sold after exercise
100,000
$18.65
$1.86M
HSIEH Wen Hsuan
12 Mar 2026
Director
Sold after exercise
130,646
$18.22
$2.38M
HSIEH Wen Hsuan
12 Mar 2026
Director
Sold after exercise
282,500
$18.55
$5.24M
Chu Steven
10 Mar 2026
Director
Sold after exercise
166,632
$17.92
$2.99M
Stefan Constantin Ionel
28 Jan 2026
Chief Technology Officer
Sold after exercise
39,690
$12.00
$476.35K
Stefan Constantin Ionel
23 Jan 2026
Chief Technology Officer
Sold after exercise
1,600
$12.00
$19.20K
Stefan Constantin Ionel
22 Jan 2026
Chief Technology Officer
Sold after exercise
492,827
$12.04
$5.93M
Stefan Constantin Ionel
21 Jan 2026
Chief Technology Officer
Sold after exercise
73,280
$12.00
$879.41K
Sun Kang
20 Jan 2026
Director
Sold after exercise
43,185
$11.03
$476.27K
Sun Kang
16 Jan 2026
Director
Sold after exercise
950,548
$11.07
$10.52M
Sun Kang
12 Jan 2026
Director
Sold after exercise
506,267
$10.10
$5.11M
Stefan Constantin Ionel
11 Dec 2025
Chief Technology Officer
Sold after exercise
198,255
$10.51
$2.08M
Sun Kang
17 Nov 2025
Chief Executive Officer
Sold after exercise
1,000,000
$10.60
$10.60M
Bornstein Jonathan
2 Apr 2024
President of Amprius Lab
Sold after exercise
125,983
$2.38
$299.61K
Bornstein Jonathan
6 Mar 2024
President of Amprius Lab
Sold after exercise
40,200
$2.78
$111.58K
Bornstein Jonathan
5 Mar 2024
President of Amprius Lab
Sold after exercise
109,800
$2.92
$320.46K
Bornstein Jonathan
6 Feb 2024
President of Amprius Lab
Sold after exercise
150,000
$4.43
$663.81K
Bornstein Jonathan
2 Jan 2024
President of Amprius Lab
Sold after exercise
25,366
$5.05
$128.08K
Bornstein Jonathan
2 Jan 2024
President of Amprius Lab
Sold after exercise
124,634
$4.32
$538.18K
Bornstein Jonathan
7 Dec 2023
President of Amprius Lab
Sold after exercise
54,477
$3.88
$211.34K
Bornstein Jonathan
6 Dec 2023
President of Amprius Lab
Sold after exercise
47,767
$4.02
$192.24K
Bornstein Jonathan
5 Dec 2023
President of Amprius Lab
Sold after exercise
47,756
$4.28
$204.50K
Bornstein Jonathan
20 Nov 2023
President of Amprius Lab
Sold after exercise
27,631
$3.84
$106.11K
Bornstein Jonathan
9 Nov 2023
President of Amprius Lab
Sold after exercise
49,508
$2.82
$139.65K
Bornstein Jonathan
8 Nov 2023
President of Amprius Lab
Sold after exercise
48,052
$3.05
$146.66K
Bornstein Jonathan
7 Nov 2023
President of Amprius Lab
Sold after exercise
24,809
$3.24
$80.42K
Bornstein Jonathan
12 Oct 2023
President of Amprius Lab
Sold after exercise
22,969
$3.90
$89.69K
Bornstein Jonathan
11 Oct 2023
President of Amprius Lab
Sold after exercise
56,702
$4.16
$236.16K
Bornstein Jonathan
10 Oct 2023
President of Amprius Lab
Sold after exercise
70,329
$4.36
$306.54K
Bornstein Jonathan
20 Sep 2023
President of Amprius Lab
Sold after exercise
6,484
$4.23
$27.40K
Bornstein Jonathan
19 Sep 2023
President of Amprius Lab
Sold after exercise
143,516
$4.37
$627.16K
Show all 127 transactions →

What was left out

Form 4 filings counted 124
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 35
Sales at will 87
Transactions with no price 0
Shares from compensation/vesting 129,066,266
History held since 16 Sep 2022