Dudediligence.

Amprius Technologies, Inc

AMPXNYSE · Miscellaneous Electrical Machinery, Equipment & Supplies
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Last 12 months

Sales planned on beside the trades reported on , and whether each names a .

Planned ·

$87.2M

27 notices · 6,482,525 sh

Oct 2025 to Oct 2026

Reported ·

$84.4M

33 sales · 0 buys

Oct 2025 to Jun 2026

The two figures cover different periods.

None of the 33 reported sales carry the 10b5-1 box. Together they are 4.28% of the shares on issue.

PLANNED · FORM 144Oct 2025 to Oct 2026REPORTED · FORM 4Oct 2025 to Jun 2026N2025DJ2026FMAMJJASO2026-08-21: THOMAS M STEPIEN, Form 1442026-08-21: Constantin Ionel Stefan, Form 1442026-08-21: KANG SUN, Form 1442026-08-24: THOMAS M STEPIEN, Form 1442026-06-08: DIXON DONALD R, Form 1442026-06-04: THOMAS M STEPIEN, Form 1442026-05-27: Thomas M. Stepien, Form 1442026-05-27: Constantin Ionel Stefan, Form 1442026-05-27: KANG SUN, Form 1442026-05-21: Thomas M. Stepien, Form 1442026-05-26: DIXON DONALD R, Form 1442026-05-21: Stefan Constantin Ionel, Form 1442026-05-21: KANG SUN, Form 1442026-04-01: KANG SUN, Form 1442026-03-23: KANG SUN, Form 1442026-03-12: STEVEN CHU, Form 1442026-03-12: WEN HSUAN HSIEH, Form 1442026-03-10: STEVEN CHU, Form 1442026-02-23: Stefan Constantin Ionel, Form 1442026-02-23: KANG SUN, Form 1442026-01-21: Stefan Constantin Ionel, Form 1442026-01-16: KANG SUN, Form 1442026-01-12: KANG SUN, Form 1442025-12-11: Stefan Constantin Ionel, Form 1442025-11-21: Stefan Constantin Ionel, Form 1442025-11-21: Kang Sun, Form 1442025-11-17: KANG SUN, Form 1442025-11-17: Sun Kang, sold2025-11-21: Sun Kang, sold2025-11-21: Stefan Constantin Ionel, sold2025-12-11: Stefan Constantin Ionel, sold2026-01-12: Sun Kang, sold2026-01-16: Sun Kang, sold2026-01-21: Stefan Constantin Ionel, sold2026-01-28: Stefan Constantin Ionel, sold2026-02-23: Sun Kang, sold2026-02-23: Stefan Constantin Ionel, sold2026-03-10: Chu Steven, sold2026-03-12: HSIEH Wen Hsuan, sold2026-03-23: Sun Kang, sold2026-04-01: Sun Kang, sold2026-05-21: Sun Kang, sold2026-05-21: Stefan Constantin Ionel, sold2026-05-21: Stepien Thomas M, sold2026-05-26: DIXON DONALD R, sold2026-05-27: Sun Kang, sold2026-05-27: Stefan Constantin Ionel, sold2026-05-27: Stepien Thomas M, sold2026-06-04: Stepien Thomas M, sold2026-06-09: DIXON DONALD R, sold2026-06-15: DIXON DONALD R, sold
under a no plan named▼ salesize is dollars

Form 144 notices, newest first

2026-08-24THOMAS M STEPIEN, Chief Executive Officer$80,240
8,000 shno plan dateForm 4s on file end Jun 23144 ↗
2026-08-21THOMAS M STEPIEN, Chief Executive Officer$243,313
23,529 shno plan dateForm 4s on file end Jun 23144 ↗
2026-08-21Constantin Ionel Stefan, Chief Technology Officer$306,930
29,681 shplan 2025-09-11Form 4s on file end Jun 23144 ↗
2026-08-21KANG SUN, Director$642,184
62,101 shno plan dateForm 4s on file end Jun 23144 ↗
2026-06-08DIXON DONALD R, Director$2,356,250
125,000 shno plan date144 ↗
Form 4, 2026-06-11: sold 40,000 at $19.13 Form 4 ↗
2026-06-04THOMAS M STEPIEN, Chief Executive Officer$41,940
2,000 shno plan date144 ↗
Form 4, 2026-06-05: sold 2,000 at $20.97 Form 4 ↗
2026-05-27Thomas M. Stepien, Chief Executive Officer$75,222
4,375 shno plan date144 ↗
Form 4, 2026-05-28: sold 4,375 at $17.19 Form 4 ↗
2026-05-27Constantin Ionel Stefan, Chief Technology Officer$55,157
3,208 shplan 2025-09-11144 ↗
Form 4, 2026-05-28: sold 3,208 at $17.19 Form 4 ↗
2026-05-27KANG SUN, Director$6,121
356 shplan 2025-08-18144 ↗
Form 4, 2026-05-28: sold 356 at $17.19 Form 4 ↗
2026-05-26DIXON DONALD R, Director$315,847
17,895 shno plan date144 ↗
Form 4, 2026-05-28: sold 17,895 at $17.90 Form 4 ↗
2026-05-21Thomas M. Stepien, Chief Executive Officer$897,685
60,702 shno plan date144 ↗
Form 4, 2026-05-26: sold 60,702 at $14.79 Form 4 ↗
2026-05-21Stefan Constantin Ionel, Chief Technology Officer$426,083
28,812 shplan 2025-09-11144 ↗
Form 4, 2026-05-26: sold 28,812 at $14.79 Form 4 ↗
2026-05-21KANG SUN, Director$1,002,594
67,796 shplan 2025-08-18144 ↗
Form 4, 2026-05-26: sold 67,796 at $14.79 Form 4 ↗
2026-04-01KANG SUN, Director, Officer$25.3M
1,500,000 shplan 2025-08-18144 ↗
Form 4, 2026-04-02: sold 1,500,000 at $15.90 Form 4 ↗
2026-03-23KANG SUN, Director$3,507,631
192,727 shplan 2025-08-18144 ↗
Form 4, 2026-03-24: sold 217,869 at $18.80 Form 4 ↗
2026-03-12STEVEN CHU, Board Seat$2,870,174
155,565 shno plan dateno Form 4 on file144 ↗
2026-03-12WEN HSUAN HSIEH, Officer, Director$7,618,412
413,146 shno plan date144 ↗
Form 4, 2026-03-13: sold 413,146 at $18.45 Form 4 ↗
2026-03-10STEVEN CHU, Board Seat$2,985,429
166,632 shno plan date144 ↗
Form 4, 2026-03-12: sold 322,197 at $18.20 Form 4 ↗
2026-02-23Stefan Constantin Ionel, Chief Technology Officer$257,719
25,366 shplan 2025-09-11144 ↗
Form 4, 2026-02-24: sold 25,366 at $10.16 Form 4 ↗
2026-02-23KANG SUN, Director$622,035
61,251 shplan 2025-08-18144 ↗
Form 4, 2026-02-24: sold 61,251 at $10.16 Form 4 ↗
2026-01-21Stefan Constantin Ionel, Chief Technology Officer$8,012,319
717,307 shplan 2025-09-11144 ↗
Form 4, 2026-01-23: sold 567,707 at $12.03 Form 4 ↗
2026-01-16KANG SUN, Director, Officer$10.3M
1,018,875 shplan 2025-08-18144 ↗
Form 4, 2026-01-20: sold 993,733 at $11.07 Form 4 ↗
2026-01-12KANG SUN, Director, Officer$4,799,411
506,267 shplan 2025-08-18144 ↗
Form 4, 2026-01-14: sold 506,267 at $10.10 Form 4 ↗
2025-12-11Stefan Constantin Ionel, Chief Technology Officer$2,188,735
198,255 shplan 2025-09-11144 ↗
Form 4, 2025-12-15: sold 198,255 at $10.51 Form 4 ↗
2025-11-21Stefan Constantin Ionel, Chief Technology Officer$252,274
25,024 shplan 2025-09-11144 ↗
Form 4, 2025-11-25: sold 25,024 at $10.08 Form 4 ↗
2025-11-21Kang Sun, Officer, Director$692,132
68,655 shplan 2025-08-18144 ↗
Form 4, 2025-11-25: sold 68,655 at $10.08 Form 4 ↗
2025-11-17KANG SUN, Director, Officer$11.3M
1,000,000 shplan 2025-08-18144 ↗
Form 4, 2025-11-19: sold 1,000,000 at $10.60 Form 4 ↗