Form 4 for AMPX Amprius Technologies, Inc.
Accepted 2026-08-25 17:21:20 ET · period of report 2026-08-21 · accession 0002067233-26-000019 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| M | 2026-08-25 17:21 | 2026-08-21+ | AMPX | Stepien Thomas M | CEO, Dir | S - Sale | $10.26 | -31.5K | 594.1K | -5% | -$323.6K |
| M | 2026-08-25 17:21 | 2026-08-25 | AMPX | Stepien Thomas M | CEO, Dir | G - Gift | $0.00 | -15.3K | 578.8K | -3% | $0 |
| I | 2026-08-25 17:21 | 2026-08-25 | AMPX | Stepien Thomas M | CEO, Dir | A - Grant | $0.00 | +346 | 37.3K | +0.9% | $0 |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Common stock | 2026-08-21 | S | D | 23,529 | $10.34 | 602,096 | D | — | — | (F1) This transaction was effected pursuant to non-discretionary, sell-to-cover arrangements mandated by the issuer to fund tax withholding obligations in connection with the vesting of restricted stock units. (F2) The price reported in Column 4 is an average execution price. These shares were sold in multiple transactions at prices ranging from $10.10 to $10.48, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above. (F3) Includes 568,750 restricted stock units, each of which represents a contingent right to receive one share of the issuer's common stock, subject to the applicable vesting schedule and conditions of each restricted stock unit. |
| 2 | Common | Common stock | 2026-08-24 | S | D | 8,000 | $10.03 | 594,096 | D | — | — | (F3) Includes 568,750 restricted stock units, each of which represents a contingent right to receive one share of the issuer's common stock, subject to the applicable vesting schedule and conditions of each restricted stock unit. |
| 3 | Common | Common stock | 2026-08-25 | G | D | 5,000 | $0.00 | 589,096 | D | — | — | (F4) These transfers were made on the same date as bona fide gifts. (F3) Includes 568,750 restricted stock units, each of which represents a contingent right to receive one share of the issuer's common stock, subject to the applicable vesting schedule and conditions of each restricted stock unit. |
| 4 | Common | Common stock | 2026-08-25 | G | D | 5,000 | $0.00 | 584,096 | D | — | — | (F4) These transfers were made on the same date as bona fide gifts. (F3) Includes 568,750 restricted stock units, each of which represents a contingent right to receive one share of the issuer's common stock, subject to the applicable vesting schedule and conditions of each restricted stock unit. |
| 5 | Common | Common stock | 2026-08-25 | G | D | 5,000 | $0.00 | 579,096 | D | — | — | (F4) These transfers were made on the same date as bona fide gifts. (F3) Includes 568,750 restricted stock units, each of which represents a contingent right to receive one share of the issuer's common stock, subject to the applicable vesting schedule and conditions of each restricted stock unit. |
| 6 | Common | Common stock | 2026-08-25 | G | D | 346 | $0.00 | 578,750 | D | — | — | (F5) These securities were transferred by the reporting person to the Rogers Stepien Family Revocable Trust, for which the reporting person and his spouse are co-trustees. (F3) Includes 568,750 restricted stock units, each of which represents a contingent right to receive one share of the issuer's common stock, subject to the applicable vesting schedule and conditions of each restricted stock unit. |
| 7 | Common | Common stock | 2026-08-25 | A | A | 346 | $0.00 | 37,260 | I See Footnote | — | — | (F5) These securities were transferred by the reporting person to the Rogers Stepien Family Revocable Trust, for which the reporting person and his spouse are co-trustees. (F6) These securities are held by the Rogers Stepien Family Revocable Trust, for which the reporting person and his spouse are co-trustees. |