AMPX Insider Transactions
122 retained open-market purchase and sale rows from SEC Forms 3, 4 and 5, newest first. This page shows rows 1–100; provenance stays internal.
AMPX insiders transaction timeline
PurchaseSale
| Insider profile | Role | Date | Transaction | Shares | Price |
|---|---|---|---|---|---|
| Stepien Thomas M | Chief Executive Officer | 2026-08-24 | Sale | 8,000 | $10.03 |
| Stepien Thomas M | Chief Executive Officer | 2026-08-21 | Sale | 23,529 | $10.341 |
| Stefan Constantin Ionel | Chief Technology Officer | 2026-08-21 | Sale | 29,681 | $10.341 |
| Sun Kang | Director | 2026-08-21 | Sale | 62,101 | $10.341 |
| DIXON DONALD R | Director | 2026-06-15 | Sale | 85,000.0 | $17.17 |
| DIXON DONALD R | Director | 2026-06-09 | Sale | 40,000.0 | $19.13 |
| Stepien Thomas M | Chief Executive Officer | 2026-06-04 | Sale | 2,000.0 | $20.97 |
| Stepien Thomas M | Chief Executive Officer | 2026-05-27 | Sale | 4,375.0 | $17.19 |
| Stefan Constantin Ionel | Chief Technology Officer | 2026-05-27 | Sale | 3,208.0 | $17.19 |
| Sun Kang | Director | 2026-05-27 | Sale | 356.0 | $17.19 |
| DIXON DONALD R | Director | 2026-05-26 | Sale | 17,895.0 | $17.9 |
| Stepien Thomas M | Chief Executive Officer | 2026-05-21 | Sale | 60,702.0 | $14.79 |
| Stefan Constantin Ionel | Chief Technology Officer | 2026-05-21 | Sale | 28,812.0 | $14.79 |
| Sun Kang | Director | 2026-05-21 | Sale | 67,796.0 | $14.79 |
| Sun Kang | Director | 2026-04-01 | Sale | 249,037.0 | $16.78 |
| Sun Kang | Director | 2026-04-01 | Sale | 1,250,963.0 | $15.73 |
| Sun Kang | Director | 2026-03-23 | Sale | 65,046.0 | $19.06 |
| Sun Kang | Director | 2026-03-23 | Sale | 152,823.0 | $18.69 |
| HSIEH Wen Hsuan | Director | 2026-03-12 | Sale | 130,646.0 | $18.22 |
| HSIEH Wen Hsuan | Director | 2026-03-12 | Sale | 282,500.0 | $18.55 |
| Chu Steven | Director | 2026-03-12 | Sale | 5,565.0 | $18.53 |
| Chu Steven | Director | 2026-03-12 | Sale | 50,000.0 | $18.21 |
| Chu Steven | Director | 2026-03-12 | Sale | 100,000.0 | $18.65 |
| Chu Steven | Director | 2026-03-10 | Sale | 166,632.0 | $17.92 |
| Stefan Constantin Ionel | Chief Technology Officer | 2026-02-23 | Sale | 25,366.0 | $10.16 |
| Sun Kang | Director | 2026-02-23 | Sale | 61,251.0 | $10.16 |
| Stefan Constantin Ionel | Chief Technology Officer | 2026-01-28 | Sale | 39,690.0 | $12.0 |
| Stefan Constantin Ionel | Chief Technology Officer | 2026-01-23 | Sale | 1,600.0 | $12.0 |
| Stefan Constantin Ionel | Chief Technology Officer | 2026-01-22 | Sale | 492,827.0 | $12.04 |
| Stefan Constantin Ionel | Chief Technology Officer | 2026-01-21 | Sale | 73,280.0 | $12.0 |
| Sun Kang | Director | 2026-01-20 | Sale | 43,185.0 | $11.03 |
| Sun Kang | Director | 2026-01-16 | Sale | 950,548.0 | $11.07 |
| Sun Kang | Director | 2026-01-12 | Sale | 506,267.0 | $10.1 |
| Stefan Constantin Ionel | Chief Technology Officer | 2025-12-11 | Sale | 198,255.0 | $10.51 |
| Stefan Constantin Ionel | Chief Technology Officer | 2025-11-21 | Sale | 25,024.0 | $10.08 |
| Sun Kang | Chief Executive Officer | 2025-11-21 | Sale | 68,655.0 | $10.08 |
| Sun Kang | Chief Executive Officer | 2025-11-17 | Sale | 1,000,000.0 | $10.6 |
| Stefan Constantin Ionel | Chief Technology Officer | 2025-08-21 | Sale | 19,159.0 | $6.82 |
| Wallach Sandra | Chief Financial Officer | 2025-08-21 | Sale | 28,390.0 | $6.82 |
| Sun Kang | Chief Executive Officer | 2025-08-21 | Sale | 65,654.0 | $6.82 |
| Stefan Constantin Ionel | Chief Technology Officer | 2025-05-21 | Sale | 20,366.0 | $2.43 |
| Wallach Sandra | Chief Financial Officer | 2025-05-21 | Sale | 27,595.0 | $2.43 |
| Sun Kang | Chief Executive Officer | 2025-05-21 | Sale | 69,786.0 | $2.43 |
| Bornstein Jonathan | President of Amprius Lab | 2025-02-21 | Sale | 13,527.0 | $3.13 |
| Stefan Constantin Ionel | Chief Technology Officer | 2025-02-21 | Sale | 9,066.0 | $3.13 |
| Wallach Sandra | Chief Financial Officer | 2025-02-21 | Sale | 18,142.0 | $3.13 |
| Sun Kang | Chief Executive Officer | 2025-02-21 | Sale | 34,353.0 | $3.13 |
| Bornstein Jonathan | President of Amprius Lab | 2024-11-21 | Sale | 18,170.0 | $1.96 |
| Bornstein Jonathan | President of Amprius Lab | 2024-11-21 | Sale | 15,000.0 | $1.96 |
| Stefan Constantin Ionel | Chief Technology Officer | 2024-11-21 | Sale | 8,575.0 | $1.96 |
| Wallach Sandra | Chief Financial Officer | 2024-11-21 | Sale | 17,158.0 | $1.96 |
| Sun Kang | Chief Executive Officer | 2024-11-21 | Sale | 33,779.0 | $1.96 |
| Bornstein Jonathan | President of Amprius Lab | 2024-11-20 | Sale | 133,536.0 | $1.92 |
| MIRRO JUSTIN E | Director | 2024-09-05 | Sale | 140,000.0 | $0.81 |
| MIRRO JUSTIN E | Director | 2024-09-05 | Sale | 110,000.0 | $0.81 |
| MIRRO JUSTIN E | Director | 2024-09-04 | Sale | 175,000.0 | $0.94 |
| MIRRO JUSTIN E | Director | 2024-09-04 | Sale | 150,000.0 | $0.94 |
| Amprius, Inc. | TenPercentOwner | 2024-09-04 | Sale | 13,255.0 | $0.95 |
| MIRRO JUSTIN E | Director | 2024-09-03 | Sale | 75,000.0 | $1.0 |
| MIRRO JUSTIN E | Director | 2024-09-03 | Sale | 60,000.0 | $1.0 |
| Amprius, Inc. | TenPercentOwner | 2024-09-03 | Sale | 6,300.0 | $1.0 |
| Wallach Sandra | Chief Financial Officer | 2024-08-21 | Sale | 17,606.0 | $1.04 |
| Bornstein Jonathan | President of Amprius Lab | 2024-08-21 | Sale | 18,644.0 | $1.04 |
| Sun Kang | Chief Executive Officer | 2024-08-21 | Sale | 33,333.0 | $1.04 |
| Stefan Constantin Ionel | Chief Technology Officer | 2024-08-21 | Sale | 8,800.0 | $1.04 |
| MIRRO JUSTIN E | Director | 2024-06-14 | Sale | 65,000.0 | $1.13 |
| MIRRO JUSTIN E | Director | 2024-06-14 | Sale | 195,000.0 | $1.13 |
| MIRRO JUSTIN E | Director | 2024-06-13 | Sale | 65,000.0 | $1.22 |
| MIRRO JUSTIN E | Director | 2024-06-13 | Sale | 195,000.0 | $1.21 |
| MIRRO JUSTIN E | Director | 2024-06-12 | Sale | 70,000.0 | $1.3 |
| MIRRO JUSTIN E | Director | 2024-06-12 | Sale | 210,000.0 | $1.3 |
| Bornstein Jonathan | President of Amprius Lab | 2024-05-22 | Sale | 8,731.0 | $1.36 |
| Stefan Constantin Ionel | Chief Technology Officer | 2024-05-22 | Sale | 4,121.0 | $1.36 |
| Wallach Sandra | Chief Financial Officer | 2024-05-22 | Sale | 8,245.0 | $1.36 |
| Sun Kang | See Remarks | 2024-05-22 | Sale | 15,611.0 | $1.36 |
| Bornstein Jonathan | President of Amprius Lab | 2024-05-21 | Sale | 11,171.0 | $1.33 |
| Stefan Constantin Ionel | Chief Technology Officer | 2024-05-21 | Sale | 5,272.0 | $1.33 |
| Wallach Sandra | Chief Financial Officer | 2024-05-21 | Sale | 10,549.0 | $1.33 |
| Sun Kang | See Remarks | 2024-05-21 | Sale | 19,973.0 | $1.33 |
| Bornstein Jonathan | President of Amprius Lab | 2024-04-02 | Sale | 125,983.0 | $2.38 |
| Bornstein Jonathan | President of Amprius Lab | 2024-03-06 | Sale | 40,200.0 | $2.78 |
| Bornstein Jonathan | President of Amprius Lab | 2024-03-05 | Sale | 109,800.0 | $2.92 |
| Bornstein Jonathan | President of Amprius Lab | 2024-02-06 | Sale | 150,000.0 | $4.43 |
| Bornstein Jonathan | President of Amprius Lab | 2024-01-02 | Sale | 25,366.0 | $5.05 |
| Bornstein Jonathan | President of Amprius Lab | 2024-01-02 | Sale | 124,634.0 | $4.32 |
| Amprius, Inc. | TenPercentOwner | 2023-12-15 | Sale | 100,000.0 | $3.54 |
| Amprius, Inc. | TenPercentOwner | 2023-12-14 | Sale | 100,000.0 | $3.55 |
| MIRRO JUSTIN E | Director | 2023-12-14 | Sale | 85,000.0 | $3.56 |
| MIRRO JUSTIN E | Director | 2023-12-14 | Sale | 170,000.0 | $3.56 |
| Amprius, Inc. | TenPercentOwner | 2023-12-13 | Sale | 100,000.0 | $3.62 |
| MIRRO JUSTIN E | Director | 2023-12-13 | Sale | 30,000.0 | $3.68 |
| MIRRO JUSTIN E | Director | 2023-12-13 | Sale | 60,000.0 | $3.68 |
| MIRRO JUSTIN E | Director | 2023-12-12 | Sale | 20,000.0 | $3.81 |
| MIRRO JUSTIN E | Director | 2023-12-12 | Sale | 40,000.0 | $3.81 |
| Bornstein Jonathan | President of Amprius Lab | 2023-12-07 | Sale | 54,477.0 | $3.88 |
| MIRRO JUSTIN E | Director | 2023-12-07 | Sale | 10,000.0 | $3.88 |
| MIRRO JUSTIN E | Director | 2023-12-07 | Sale | 20,000.0 | $3.88 |
| Bornstein Jonathan | President of Amprius Lab | 2023-12-06 | Sale | 47,767.0 | $4.02 |
| MIRRO JUSTIN E | Director | 2023-12-06 | Sale | 10,000.0 | $4.05 |
| MIRRO JUSTIN E | Director | 2023-12-06 | Sale | 20,000.0 | $4.05 |