Jack Y. Zhang
CIK 1611157 · CEO & CHIEF SCIENTIFIC OFFICER · last filed 2026-03-17
Jack Y. Zhang is a CEO & CHIEF SCIENTIFIC OFFICER who has filed 32 SEC Form 4 insider transactions across 1 company since 2015. The most recent filing shows the insider had shares withheld for taxes covering $461.5K of AMPH on Mar 17, 2026. Across all open-market trades the lifetime net is −$63.7M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $85.1M 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.
$85.08M
1
32
-$63.66M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| AMPH | CEO & CHIEF SCIENTIFIC OFFICER | 4,235,177 | $20.09 | $85.08M | -$63.66M | 32 | 2026-03-17 |
Recent Filings
32 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-03-17 | AMPH | Tax (F) | −25,384 | -$461.5K | EDGAR |
| 2026-03-11 | AMPH | Mixed | +467,572 | -$725.4K | EDGAR |
| 2026-03-10 | AMPH | Tax (F) | −21,700 | -$419.7K | EDGAR |
| 2025-03-18 | AMPH | Mixed | +150,990 | -$8.03M | EDGAR |
| 2025-03-12 | AMPH | Grant (A) | +330,444 | $0 | EDGAR |
| 2025-03-10 | AMPH | Tax (F) | −25,428 | -$720.1K | EDGAR |
| 2025-03-06 | AMPH | Tax (F) | −16,358 | -$451.8K | EDGAR |
| 2024-09-16 | AMPH | Exer (M) | +200,000 | $2.94M | EDGAR |
| 2024-06-11 | AMPH | Exer (M) | +200,000 | $2.94M | EDGAR |
| 2024-03-19 | AMPH | Mixed | +797,554 | -$28.86M | EDGAR |