Jack Y. Zhang
CIK 1611157 · CEO & CHIEF SCIENTIFIC OFFICER · last filed 2026-03-17
"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.
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Disclosed Exposure
$85.08M
Companies
1
Total Filings
32
Lifetime Open-Market Net
-$63.66M
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
| 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 · Page 3 of 4
32 filingsForm 4 transactions across all companies, newest first.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2018-03-16 | AMPH | Grant (A) | +279,432 | $0 | EDGAR |
| 2017-12-19 | AMPH | Mixed | +365,172 | -$7.69M | EDGAR |
| 2017-09-15 | AMPH | Mixed | −1,180,010 | -$15.98M | EDGAR |
| 2017-05-25 | AMPH | Exer (M) | +1,294,686 | $14.90M | EDGAR |
| 2017-03-28 | AMPH | Tax (F) | −130,508 | -$1.83M | EDGAR |
| 2016-09-22 | AMPH | Mixed | — | -$3.80M | EDGAR |
| 2016-03-29 | AMPH | Tax (F) | −113,824 | -$1.36M | EDGAR |
| 2016-03-21 | AMPH | Grant (A) | +527,802 | $0 | EDGAR |
| 2016-02-03 | AMPH | — | — | $0 | EDGAR |
| 2015-12-11 | AMPH | Sell (S) | −126,600 | -$1.80M | EDGAR |
Codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.