InsiderClue
Stocks · Technology · Miscellaneous Electrical Machinery, Equipment & Supplies

Amprius Technologies, Inc.

AMPX Clue Score50
United States Fiscal year ends December CIK 0001899287 Results filed 4 Aug 2026
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What the insiders did Net selling

Individual transactions

127
Insider
Date
Role
Action
Shares
Price
Amount
Thomas M Stepien
24 Aug 2026
Chief Executive Officer
Sell
8,000
$10.03
$80.24K
Thomas M Stepien
21 Aug 2026
Chief Executive Officer
Sell
23,529
$10.34
$243.31K
Constantin Ionel Stefan
21 Aug 2026
Chief Technology Officer
Sell
29,681
$10.34
$306.93K
Kang Sun
21 Aug 2026
Director
Sell
62,101
$10.34
$642.19K
Donald R Dixon
15 Jun 2026
Director
Sell indirect
85,000
$17.17
$1.46M
Donald R Dixon
9 Jun 2026
Director
Sell indirect
40,000
$19.13
$765.20K
Thomas M Stepien
4 Jun 2026
Chief Executive Officer
Sell
2,000
$20.97
$41.94K
Constantin Ionel Stefan
27 May 2026
Chief Technology Officer
Sell
3,208
$17.19
$55.16K
Thomas M Stepien
27 May 2026
Chief Executive Officer
Sell
4,375
$17.19
$75.22K
Kang Sun
27 May 2026
Director
Sell
356
$17.19
$6.12K
Donald R Dixon
26 May 2026
Director
Sell indirect
17,895
$17.90
$320.25K
Thomas M Stepien
21 May 2026
Chief Executive Officer
Sell
60,702
$14.79
$897.69K
Constantin Ionel Stefan
21 May 2026
Chief Technology Officer
Sell
28,812
$14.79
$426.08K
Kang Sun
21 May 2026
Director
Sell
67,796
$14.79
$1.00M
Kang Sun
1 Apr 2026
Director
Sold after exercise
249,037
$16.78
$4.18M
Kang Sun
1 Apr 2026
Director
Sold after exercise
1,250,963
$15.73
$19.68M
Kang Sun
23 Mar 2026
Director
Sell indirect
65,046
$19.06
$1.24M
Kang Sun
23 Mar 2026
Director
Sell indirect
152,823
$18.69
$2.86M
Steven Chu
12 Mar 2026
Director
Sold after exercise
5,565
$18.53
$103.15K
Steven Chu
12 Mar 2026
Director
Sold after exercise
50,000
$18.21
$910.74K
Steven Chu
12 Mar 2026
Director
Sold after exercise
100,000
$18.65
$1.86M
Wen Hsuan HSIEH
12 Mar 2026
Director
Sold after exercise
130,646
$18.22
$2.38M
Wen Hsuan HSIEH
12 Mar 2026
Director
Sold after exercise
282,500
$18.55
$5.24M
Steven Chu
10 Mar 2026
Director
Sold after exercise
166,632
$17.92
$2.99M
Constantin Ionel Stefan
23 Feb 2026
Chief Technology Officer
Sell
25,366
$10.16
$257.60K
Kang Sun
23 Feb 2026
Director
Sell
61,251
$10.16
$622.03K
Constantin Ionel Stefan
28 Jan 2026
Chief Technology Officer
Sold after exercise
39,690
$12.00
$476.35K
Constantin Ionel Stefan
23 Jan 2026
Chief Technology Officer
Sold after exercise
1,600
$12.00
$19.20K
Constantin Ionel Stefan
22 Jan 2026
Chief Technology Officer
Sold after exercise
492,827
$12.04
$5.93M
Constantin Ionel Stefan
21 Jan 2026
Chief Technology Officer
Sold after exercise
73,280
$12.00
$879.41K
Kang Sun
20 Jan 2026
Director
Sold after exercise
43,185
$11.03
$476.27K
Kang Sun
16 Jan 2026
Director
Sold after exercise
950,548
$11.07
$10.52M
Kang Sun
12 Jan 2026
Director
Sold after exercise
506,267
$10.10
$5.11M
Constantin Ionel Stefan
11 Dec 2025
Chief Technology Officer
Sold after exercise
198,255
$10.51
$2.08M
Kang Sun
21 Nov 2025
Chief Executive Officer
Sell
68,655
$10.08
$692.13K
Constantin Ionel Stefan
21 Nov 2025
Chief Technology Officer
Sell
25,024
$10.08
$252.27K
Kang Sun
17 Nov 2025
Chief Executive Officer
Sold after exercise
1,000,000
$10.60
$10.60M
Kang Sun
21 Aug 2025
Chief Executive Officer
Sell
65,654
$6.82
$447.51K
Sandra Wallach
21 Aug 2025
Chief Financial Officer
Sell
28,390
$6.82
$193.51K
Constantin Ionel Stefan
21 Aug 2025
Chief Technology Officer
Sell
19,159
$6.82
$130.59K
Kang Sun
21 May 2025
Chief Executive Officer
Sell
69,786
$2.43
$169.72K
Sandra Wallach
21 May 2025
Chief Financial Officer
Sell
27,595
$2.43
$67.11K
Constantin Ionel Stefan
21 May 2025
Chief Technology Officer
Sell
20,366
$2.43
$49.53K
Constantin Ionel Stefan
14 Mar 2025
Chief Technology Officer
Exercised, kept
3,471
$0.98
$3.40K
Jonathan Bornstein
10 Mar 2025
President of Amprius Lab
Exercised, kept
3,471
$0.98
$3.40K
Jonathan Bornstein
21 Feb 2025
President of Amprius Lab
Sell
13,527
$3.13
$42.38K
Constantin Ionel Stefan
21 Feb 2025
Chief Technology Officer
Sell
9,066
$3.13
$28.41K
Sandra Wallach
21 Feb 2025
Chief Financial Officer
Sell
18,142
$3.13
$56.84K
Kang Sun
21 Feb 2025
Chief Executive Officer
Sell
34,353
$3.13
$107.63K
Constantin Ionel Stefan
21 Nov 2024
Chief Technology Officer
Sell
8,575
$1.96
$16.85K
Sandra Wallach
21 Nov 2024
Chief Financial Officer
Sell
17,158
$1.96
$33.71K
Jonathan Bornstein
21 Nov 2024
President of Amprius Lab
Sell
18,170
$1.96
$35.70K
Jonathan Bornstein
21 Nov 2024
President of Amprius Lab
Sell indirect
15,000
$1.96
$29.44K
Kang Sun
21 Nov 2024
Chief Executive Officer
Sell
33,779
$1.96
$66.36K
Jonathan Bornstein
20 Nov 2024
President of Amprius Lab
Sell indirect
133,536
$1.92
$256.88K
Justin E Mirro
5 Sep 2024
Director
Sell indirect
140,000
$0.81
$112.71K
Justin E Mirro
5 Sep 2024
Director
Sell indirect
110,000
$0.81
$88.55K
Amprius, Inc.
4 Sep 2024
10% owner
Sell
13,255
$0.95
$12.59K
Justin E Mirro
4 Sep 2024
Director
Sell indirect
175,000
$0.94
$164.78K
Justin E Mirro
4 Sep 2024
Director
Sell indirect
150,000
$0.94
$140.97K
Amprius, Inc.
3 Sep 2024
10% owner
Sell
6,300
$1.00
$6.30K
Justin E Mirro
3 Sep 2024
Director
Sell indirect
75,000
$1.00
$74.78K
Justin E Mirro
3 Sep 2024
Director
Sell indirect
60,000
$1.00
$60.05K
Constantin Ionel Stefan
21 Aug 2024
Chief Technology Officer
Sell
8,800
$1.04
$9.15K
Kang Sun
21 Aug 2024
Chief Executive Officer
Sell
33,333
$1.04
$34.67K
Jonathan Bornstein
21 Aug 2024
President of Amprius Lab
Sell
18,644
$1.04
$19.39K
Sandra Wallach
21 Aug 2024
Chief Financial Officer
Sell
17,606
$1.04
$18.31K
Justin E Mirro
14 Jun 2024
Director
Sell indirect
65,000
$1.13
$73.52K
Justin E Mirro
14 Jun 2024
Director
Sell indirect
195,000
$1.13
$220.55K
Justin E Mirro
13 Jun 2024
Director
Sell indirect
65,000
$1.22
$79.06K
Justin E Mirro
13 Jun 2024
Director
Sell indirect
195,000
$1.21
$236.59K
Justin E Mirro
12 Jun 2024
Director
Sell indirect
70,000
$1.30
$90.90K
Justin E Mirro
12 Jun 2024
Director
Sell indirect
210,000
$1.30
$272.60K
Sandra Wallach
22 May 2024
Chief Financial Officer
Sell
8,245
$1.36
$11.18K
Jonathan Bornstein
22 May 2024
President of Amprius Lab
Sell
8,731
$1.36
$11.84K
Kang Sun
22 May 2024
See Remarks
Sell
15,611
$1.36
$21.17K
Constantin Ionel Stefan
22 May 2024
Chief Technology Officer
Sell
4,121
$1.36
$5.59K
Sandra Wallach
21 May 2024
Chief Financial Officer
Sell
10,549
$1.33
$14.00K
Jonathan Bornstein
21 May 2024
President of Amprius Lab
Sell
11,171
$1.33
$14.83K
Kang Sun
21 May 2024
See Remarks
Sell
19,973
$1.33
$26.52K
Constantin Ionel Stefan
21 May 2024
Chief Technology Officer
Sell
5,272
$1.33
$7.00K
Jonathan Bornstein
12 Apr 2024
President of Amprius Lab
Exercised, kept
1,007,867
$0.05
$50.39K
Jonathan Bornstein
2 Apr 2024
President of Amprius Lab
Sold after exercise
125,983
$2.38
$299.61K
Jonathan Bornstein
6 Mar 2024
President of Amprius Lab
Sold after exercise
40,200
$2.78
$111.58K
Jonathan Bornstein
5 Mar 2024
President of Amprius Lab
Sold after exercise
109,800
$2.92
$320.46K
Jonathan Bornstein
6 Feb 2024
President of Amprius Lab
Sold after exercise
150,000
$4.43
$663.81K
Jonathan Bornstein
2 Jan 2024
President of Amprius Lab
Sold after exercise
25,366
$5.05
$128.08K
Jonathan Bornstein
2 Jan 2024
President of Amprius Lab
Sold after exercise
124,634
$4.32
$538.18K
Amprius, Inc.
15 Dec 2023
10% owner
Sell
100,000
$3.54
$353.60K
Justin E Mirro
14 Dec 2023
Director
Sell indirect
85,000
$3.56
$302.37K
Justin E Mirro
14 Dec 2023
Director
Sell indirect
170,000
$3.56
$605.08K
Amprius, Inc.
14 Dec 2023
10% owner
Sell
100,000
$3.55
$354.80K
Justin E Mirro
13 Dec 2023
Director
Sell indirect
30,000
$3.68
$110.34K
Justin E Mirro
13 Dec 2023
Director
Sell indirect
60,000
$3.68
$220.78K
Amprius, Inc.
13 Dec 2023
10% owner
Sell
100,000
$3.62
$361.69K
Justin E Mirro
12 Dec 2023
Director
Sell indirect
20,000
$3.81
$76.21K
Justin E Mirro
12 Dec 2023
Director
Sell indirect
40,000
$3.81
$152.58K
Jonathan Bornstein
7 Dec 2023
President of Amprius Lab
Sold after exercise
54,477
$3.88
$211.34K
Justin E Mirro
7 Dec 2023
Director
Sell indirect
10,000
$3.88
$38.81K
Justin E Mirro
7 Dec 2023
Director
Sell indirect
20,000
$3.88
$77.63K
Jonathan Bornstein
6 Dec 2023
President of Amprius Lab
Sold after exercise
47,767
$4.02
$192.24K
Justin E Mirro
6 Dec 2023
Director
Sell indirect
10,000
$4.05
$40.49K
Justin E Mirro
6 Dec 2023
Director
Sell indirect
20,000
$4.05
$80.93K
Jonathan Bornstein
5 Dec 2023
President of Amprius Lab
Sold after exercise
47,756
$4.28
$204.50K
Justin E Mirro
5 Dec 2023
Director
Sell indirect
10,000
$4.31
$43.07K
Justin E Mirro
5 Dec 2023
Director
Sell indirect
20,000
$4.33
$86.65K
Justin E Mirro
30 Nov 2023
Director
Sell indirect
15,000
$4.18
$62.77K
Justin E Mirro
30 Nov 2023
Director
Sell indirect
30,000
$4.19
$125.59K
Justin E Mirro
29 Nov 2023
Director
Sell indirect
20,000
$4.01
$80.11K
Justin E Mirro
29 Nov 2023
Director
Sell indirect
40,000
$4.01
$160.34K
Justin E Mirro
28 Nov 2023
Director
Sell indirect
15,000
$3.70
$55.55K
Justin E Mirro
28 Nov 2023
Director
Sell indirect
30,000
$3.71
$111.39K
Jonathan Bornstein
20 Nov 2023
President of Amprius Lab
Sold after exercise
27,631
$3.84
$106.11K
Jonathan Bornstein
9 Nov 2023
President of Amprius Lab
Sold after exercise
49,508
$2.82
$139.65K
Jonathan Bornstein
8 Nov 2023
President of Amprius Lab
Sold after exercise
48,052
$3.05
$146.66K
Jonathan Bornstein
7 Nov 2023
President of Amprius Lab
Sold after exercise
24,809
$3.24
$80.42K
Jonathan Bornstein
12 Oct 2023
President of Amprius Lab
Sold after exercise
22,969
$3.90
$89.69K
Jonathan Bornstein
11 Oct 2023
President of Amprius Lab
Sold after exercise
56,702
$4.16
$236.16K
Jonathan Bornstein
10 Oct 2023
President of Amprius Lab
Sold after exercise
70,329
$4.36
$306.54K
Jonathan Bornstein
20 Sep 2023
President of Amprius Lab
Sold after exercise
6,484
$4.23
$27.40K
Jonathan Bornstein
19 Sep 2023
President of Amprius Lab
Sold after exercise
143,516
$4.37
$627.16K
Constantin Ionel Stefan
15 Sep 2023
Chief Technology Officer
Sell
33,630
$3.89
$130.73K
Constantin Ionel Stefan
14 Sep 2023
Chief Technology Officer
Sell
46,370
$3.66
$169.49K
Constantin Ionel Stefan
9 Sep 2023
Chief Technology Officer
Exercised, kept
80,000
$0.05
$4.00K
Justin E Mirro
15 Jun 2023
Director
Sell indirect
61,000
$8.85
$540.13K
Justin E Mirro
14 Jun 2023
Director
Sell indirect
50,000
$9.50
$474.92K
Constantin Ionel Stefan
14 Dec 2022
Chief Technology Officer
Exercised, kept
30,000
$0.05
$1.50K

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