Steven Chu
CIK 1296381 · last filed 2026-03-12
Steven Chu is a corporate insider who has filed 8 SEC Form 4 insider transactions across 2 companies since 2022. The most recent filing, for AMPX.WS, was dated Mar 12, 2026. Across all open-market trades the lifetime net is −$5.9M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $943.6K across reported positions.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
$943.6K
2
8
-$5.86M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| AMPX.WS | Director | 132,904 | $7.10 | $943.6K | -$5.86M | 5 | 2026-03-12 |
| Zymergen Inc. (ZY) Delisted | Director | 0 | $2.43 | $0 | $0 | 2 | 2022-10-19 |
Recent Filings
8 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-03-12 | AMPX.WS | Mixed | −62,500 | -$5.53M | EDGAR |
| 2025-06-17 | AMPX.WS | Grant (A) | +44,444 | $0 | EDGAR |
| 2024-10-25 | AMPX.WS | Grant (A) | — | $0 | EDGAR |
| 2024-06-07 | AMPX.WS | Grant (A) | +125,000 | $0 | EDGAR |
| 2023-06-12 | AMPX.WS | Grant (A) | +17,895 | $0 | EDGAR |
| 2022-10-19 | Zymergen Inc. (ZY) Delisted | Disp (D) | −50,000 | $0 | EDGAR |
| 2022-09-16 | — | Grant (A) | — | $0 | |
| 2022-06-06 | Zymergen Inc. (ZY) Delisted | Grant (A) | +50,000 | $0 | EDGAR |