Amprius Technologies, Inc. (AMPX)
Amprius Technologies, Inc. (AMPX) Insider Trading
Directors, officers and holders of more than 10% of AMPX report their trades in its stock on SEC Form 4, within two business days. Each row below is one Form 4 transaction line. The one-letter code says what kind of transaction it was: only P (purchase) and S (sale) are open-market or private trades; awards, option exercises, tax withholding and gifts carry other codes.
Recent Form 4 transactions
The 50 most recent of 161 transactions on file: 0 with code P, 24 with code S and 26 with other codes.
| Date | Insider | Title | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 25, 2026 | Stepien Thomas M | Chief Executive Officer | G Gift | 346 | Not measured | Not measured |
| Aug 25, 2026 | Stepien Thomas M | Chief Executive Officer | G Gift | 5,000 | Not measured | Not measured |
| Aug 25, 2026 | Stepien Thomas M | Chief Executive Officer | G Gift | 5,000 | Not measured | Not measured |
| Aug 25, 2026 | Stepien Thomas M | Chief Executive Officer | G Gift | 5,000 | Not measured | Not measured |
| Aug 25, 2026 | Stepien Thomas M | Chief Executive Officer | A Award | 346 | Not measured | Not measured |
| Aug 24, 2026 | Stepien Thomas M | Chief Executive Officer | S Sale | 8,000 | $10.03 | $80,240 |
| Aug 21, 2026 | Stepien Thomas M | Chief Executive Officer | S Sale | 23,529 | $10.34 | $243,313 |
| Aug 21, 2026 | Stefan Constantin Ionel | Chief Technology Officer | S Sale | 29,681 | $10.34 | $306,931 |
| Aug 21, 2026 | Sun Kang | Director | S Sale | 62,101 | $10.34 | $642,186 |
| Jun 15, 2026 | DIXON DONALD R | Director | S Sale | 85,000 | $17.17 | $1,459,212 |
| Jun 12, 2026 | Chu Steven | Director | A Award | 10,423 | Not measured | Not measured |
| Jun 12, 2026 | DIXON DONALD R | Director | A Award | 10,423 | Not measured | Not measured |
| Jun 12, 2026 | SATTERTHWAITE LIVINGSTON | Director | A Award | 10,423 | Not measured | Not measured |
| Jun 12, 2026 | BAYLESS KATHLEEN A | Director | A Award | 10,423 | Not measured | Not measured |
| Jun 9, 2026 | DIXON DONALD R | Director | S Sale | 40,000 | $19.13 | $765,200 |
| Jun 4, 2026 | Stepien Thomas M | Chief Executive Officer | G Gift | 30,384 | Not measured | Not measured |
| Jun 4, 2026 | Stepien Thomas M | Chief Executive Officer | G Gift | 36,914 | Not measured | Not measured |
| Jun 4, 2026 | Stepien Thomas M | Chief Executive Officer | S Sale | 2,000 | $20.97 | $41,940 |
| Jun 4, 2026 | Stepien Thomas M | Chief Executive Officer | G Gift | 36,914 | Not measured | Not measured |
| May 27, 2026 | Stefan Constantin Ionel | Chief Technology Officer | S Sale | 3,208 | $17.19 | $55,157 |
| May 27, 2026 | Sun Kang | Director | S Sale | 356 | $17.19 | $6,121 |
| May 27, 2026 | Stepien Thomas M | Chief Executive Officer | S Sale | 4,375 | $17.19 | $75,222 |
| May 26, 2026 | DIXON DONALD R | Director | S Sale | 17,895 | $17.90 | $320,252 |
| May 21, 2026 | Stepien Thomas M | Chief Executive Officer | S Sale | 60,702 | $14.79 | $897,685 |
| May 21, 2026 | Sun Kang | Director | S Sale | 67,796 | $14.79 | $1,002,594 |
| May 21, 2026 | Stefan Constantin Ionel | Chief Technology Officer | S Sale | 28,812 | $14.79 | $426,083 |
| May 5, 2026 | Sun Kang | Director | A Award | 6,250 | Not measured | Not measured |
| Apr 1, 2026 | Sun Kang | Director | S Sale | 249,037 | $16.78 | $4,179,563 |
| Apr 1, 2026 | Sun Kang | Director | M Exercise | 187,495 | $3.68 | $689,982 |
| Apr 1, 2026 | Sun Kang | Director | M Exercise | 1,312,505 | $1.78 | $2,336,259 |
| Apr 1, 2026 | Sun Kang | Director | M Exercise | 187,495 | $3.68 | $689,982 |
| Apr 1, 2026 | Sun Kang | Director | S Sale | 1,250,963 | $15.73 | $19,681,151 |
| Apr 1, 2026 | Sun Kang | Director | M Exercise | 1,312,505 | $1.78 | $2,336,259 |
| Mar 23, 2026 | Sun Kang | Director | S Sale | 152,823 | $18.69 | $2,855,696 |
| Mar 23, 2026 | Sun Kang | Director | S Sale | 65,046 | $19.06 | $1,239,705 |
| Mar 12, 2026 | HSIEH Wen Hsuan | Director | S Sale | 282,500 | $18.55 | $5,239,245 |
| Mar 12, 2026 | HSIEH Wen Hsuan | Director | S Sale | 130,646 | $18.22 | $2,380,788 |
| Mar 12, 2026 | Chu Steven | Director | M Exercise | 86,143 | $2.61 | $224,833 |
| Mar 12, 2026 | Chu Steven | Director | M Exercise | 69,422 | $0.6200 | $43,042 |
| Mar 12, 2026 | Chu Steven | Director | S Sale | 5,565 | $18.53 | $103,145 |
| Mar 12, 2026 | Chu Steven | Director | M Exercise | 86,143 | $2.61 | $224,833 |
| Mar 12, 2026 | Chu Steven | Director | S Sale | 100,000 | $18.65 | $1,864,670 |
| Mar 12, 2026 | Chu Steven | Director | M Exercise | 69,422 | $0.6200 | $43,042 |
| Mar 12, 2026 | HSIEH Wen Hsuan | Director | M Exercise | 270,251 | $2.61 | $705,355 |
| Mar 12, 2026 | Chu Steven | Director | S Sale | 50,000 | $18.21 | $910,740 |
| Mar 12, 2026 | HSIEH Wen Hsuan | Director | M Exercise | 270,251 | $2.61 | $705,355 |
| Mar 10, 2026 | Chu Steven | Director | S Sale | 166,632 | $17.92 | $2,985,429 |
| Mar 10, 2026 | Chu Steven | Director | M Exercise | 104,132 | $0.6200 | $64,562 |
| Mar 10, 2026 | Chu Steven | Director | M Exercise | 104,132 | $0.6200 | $64,562 |
| Mar 4, 2026 | Stepien Thomas M | Chief Executive Officer | A Award | 150,000 | Not measured | Not measured |
The full Form 4 history is on the AMPX company page (Insider Trades card, View all).
Questions about this data
Which insider transactions are open-market trades?
Code P (open market or private purchase) and code S (open market or private sale). Code F is shares withheld to pay tax on vesting stock, A is an award from the company, M and X are option exercises and G is a gift. None of those is the insider choosing to buy or sell in the market.
How quickly are insider trades reported?
A Form 4 is due before the end of the second business day after the trade. The date shown is the transaction date from the form.
Who has to file Form 4?
Officers, directors and beneficial owners of more than 10% of a class of the company’s registered equity, under Section 16 of the Securities Exchange Act.
Look up any code in the Form 4 transaction code reference, or read Form 4 codes explained.