Amprius Technologies, Inc. AMPX
CIK 0001899287
Form 4 transactions dated Sep 1, 2023 to Sep 25, 2026, as reported to the SEC.
Insider purchases & sales
- Purchased
- $0.00
- Sold
- $97.47M
Sep 1, 2023 – Aug 25, 2026
Available records · partial months are marked ·
| Date | Insider | Activity | Trade value (USD) | % of prior holding | |
|---|---|---|---|---|---|
| 2026-08-24 | Stepien Thomas M Chief Executive Officer · Director | Sale | $80.24K 8,000 shares sold | 1.33% sold Direct holding | ▾ |
| 2026-08-21 | Stepien Thomas M Chief Executive Officer · Director | Sale | $243.31K 23,529 shares sold | 3.76% sold Direct holding | ▾ |
| 2026-08-21 | Stefan Constantin Ionel Chief Technology Officer | Sale | $306.93K 29,681 shares sold | 3.70% sold Direct holding | ▾ |
| 2026-08-21 | Sun Kang Director | Sale | $642.19K 62,101 shares sold | 4.85% sold Direct holding | ▾ |
| 2026-06-15 | DIXON DONALD R Director | Sale | $1.46M 85,000 shares sold | 19.13% sold Indirect holding | ▾ |
| 2026-06-09 | DIXON DONALD R Director | Sale | $765.20K 40,000 shares sold | 8.26% sold Indirect holding | ▾ |
| 2026-06-04 | Stepien Thomas M Chief Executive Officer · Director | Sale | $41.94K 2,000 shares sold | 0.32% sold Direct holding | ▾ |
| 2026-05-27 | Stepien Thomas M Chief Executive Officer · Director | Sale | $75.22K 4,375 shares sold | 0.63% sold Direct holding | ▾ |
| 2026-05-27 | Stefan Constantin Ionel Chief Technology Officer | Sale | $55.16K 3,208 shares sold | 0.40% sold Direct holding | ▾ |
| 2026-05-27 | Sun Kang Director | Sale | $6.12K 356 shares sold | 0.03% sold Direct holding | ▾ |
Showing 28 / 28 record groups in 2026. The complete set is available through the API.
Follow the people behind the trades.
Sign in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and reach other datasets through the Akkru API.
- Download CSV
- Earlier filings
- Advanced screening & filtering
- API & AI access
＋ New accounts get free API credits to explore data beyond ownership filings.
For AI agents & developers
The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. For the year shown, this page lists 28 of 28 purchase / sale groups and 30 of 44 other groups; the totals and the monthly series cover the whole window.
Without an account: the last 3 years, with the row caps stated on the page. A free account opens all history on file on these pages and the CSV of what a page shows. Rows beyond the caps and bulk retrieval go through the authenticated API / MCP.
MCP https://api.akkrudata.ai/mcp
list_insider_transactions
{"ticker":"AMPX","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}Connect to MCP with OAuth and follow the returned pagination. Credits and usage limits depend on the account.
- MCP endpoint
- https://api.akkrudata.ai/mcp
- API / MCP documentation
- /documents
- llms.txt
- /llms.txt
Sources, coverage & how to read this data
Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.