ZLAB insider buying and SEC filings, explained
Zai Lab Ltd · CIK 1704292
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$0
Insiders who bought
0
Sold (not marked 10b5-1)
$1.7M
Planned sales (10b5-1)
$9.2M
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Aug 19, 2026 | Planned (10b5-1) | Yajing Chen (CFO) sold 260 shares at $27.00 ($7K), marked as a 10b5-1 plan trade. Holdings down 1% to 35,635 shares. | SEC filing Filed Aug 21, 2026 |
| Aug 12, 2026 | Planned (10b5-1) | William Lis (Director) sold 8,506 shares at $25.00 ($213K), marked as a 10b5-1 plan trade. Holdings down 17% to 41,931 shares. | SEC filing Filed Aug 13, 2026 |
| Aug 11, 2026 | Planned (10b5-1) | Yajing Chen (CFO) sold 619 shares at $25.00 ($15K), marked as a 10b5-1 plan trade. Holdings down 2% to 35,072 shares. | SEC filing Filed Aug 13, 2026 |
| Jul 1, 2026 | Purchase (code P) | Richard Gaynor (Director) bought 1,736 shares at $19.05 ($33K), reported as a purchase (code P). Holdings up 2% to 80,737 shares. | SEC filing Filed Jul 6, 2026 |
| Jun 30, 2026 | Sale | Ying Du (CEO and Director) sold 7,026 shares at $18.53 ($130K). Holdings down 1% to 1,203,784 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jul 1, 2026 |
| Jun 26, 2026 | Sale | Frazor Titus Edmondson III (Chief Legal Officer) sold 4,103 shares at $17.46 ($72K). Holdings down 12% to 30,346 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jun 29, 2026 |
| Jun 26, 2026 | Sale | Ying Du (CEO and Director) sold 24,543 shares at $17.46 ($429K). Holdings down 2% to 1,192,840 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jun 29, 2026 |
| Jun 26, 2026 | Sale | Yajing Chen (CFO) sold 2,264 shares at $17.46 ($40K). Holdings down 6% to 35,691 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jun 29, 2026 |
| Jun 22, 2026 | Planned (10b5-1) | William Lis (Director) sold 7,040 shares at $18.09 ($127K), marked as a 10b5-1 plan trade. Holdings down 12% to 50,437 shares. | SEC filing Filed Jun 24, 2026 |
| May 15–18, 2026 | Planned (10b5-1) | Ying Du (CEO and Director) sold 100,000 shares between May 15 and May 18 at about $19.87 ($2.0M), marked as a 10b5-1 plan trade. Holdings down 8% to 1,122,626 shares. | SEC filing Filed May 19, 2026 |
| May 14, 2026 | Planned (10b5-1) | Frazor Titus Edmondson III (Chief Legal Officer) sold 3,517 shares at $20.19 ($71K), marked as a 10b5-1 plan trade. Holdings down 15% to 19,849 shares. | SEC filing Filed May 15, 2026 |
| May 13–14, 2026 | Planned (10b5-1) | Ying Du (CEO and Director) sold 100,000 shares between May 13 and May 14 at about $20.03 ($2.0M), marked as a 10b5-1 plan trade. Holdings down 8% to 1,122,626 shares. | SEC filing Filed May 15, 2026 |
| Apr 6, 2026 | Sale | Joshua L Smiley (President / COO) sold 3,017 shares at $20.45 ($62K). Holdings down 3% to 117,602 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Apr 8, 2026 |
| Apr 6, 2026 | Sale | Frazor Titus Edmondson III (Chief Legal Officer) sold 1,224 shares at $20.45 ($25K). Holdings down 5% to 23,366 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Apr 8, 2026 |
| Apr 6, 2026 | Sale | Ying Du (CEO and Director) sold 2,653 shares at $20.45 ($54K). Holdings down <1% to 1,122,626 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Apr 8, 2026 |
| Apr 6, 2026 | Sale | Yajing Chen (CFO) sold 853 shares at $20.45 ($17K). Holdings down 3% to 31,705 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Apr 8, 2026 |
| Apr 6, 2026 | Sale | Rafael Amado (President / COO) sold 2,739 shares at $20.45 ($56K). Holdings down 5% to 57,022 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Apr 8, 2026 |
| Apr 2, 2026 | Sale | Joshua L Smiley (President / COO) sold 9,614 shares at $20.39 ($196K). Holdings down 7% to 120,619 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Apr 3, 2026 |
| Apr 2, 2026 | Sale | Yajing Chen (CFO) sold 5,199 shares at $20.39 ($106K). Holdings down 14% to 32,558 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Apr 3, 2026 |
| Apr 2, 2026 | Sale | Rafael Amado (President / COO) sold 9,910 shares at $20.39 ($202K). Holdings down 14% to 59,761 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Apr 3, 2026 |
| Mar 17, 2026 | Purchase (code P) | Richard Gaynor (Director) bought 1,731 shares at $18.91 ($33K), reported as a purchase (code P). Holdings up 3% to 56,630 shares. | SEC filing Filed Mar 19, 2026 |
| Mar 13, 2026 | Sale | Joshua L Smiley (President / COO) sold 1,966 shares at $18.63 ($37K). Holdings down 2% to 91,026 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 16, 2026 |
| Mar 13, 2026 | Sale | Frazor Titus Edmondson III (Chief Legal Officer) sold 1,281 shares at $18.63 ($24K). Holdings down 16% to 6,494 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 16, 2026 |
| Mar 13, 2026 | Sale | Yajing Chen (CFO) sold 1,703 shares at $18.63 ($32K). Holdings down 8% to 19,999 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 16, 2026 |
| Mar 13, 2026 | Sale | Rafael Amado (President / COO) sold 2,957 shares at $18.63 ($55K). Holdings down 6% to 44,757 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 16, 2026 |
| Mar 11, 2026 | Planned (10b5-1) | Ying Du (CEO and Director) sold 1,067 shares at $19.08 ($20K), marked as a 10b5-1 plan trade. Holdings down <1% to 1,109,905 shares. | SEC filing Filed Mar 12, 2026 |
| Mar 6–9, 2026 | Planned (10b5-1) | Ying Du (CEO and Director) sold 100,000 shares between Mar 6 and Mar 9 at about $19.23 ($1.9M), marked as a 10b5-1 plan trade. Holdings down 9% to 964,161 shares. | SEC filing Filed Mar 10, 2026 |
| Mar 5, 2026 | Planned (10b5-1) | Frazor Titus Edmondson III (Chief Legal Officer) sold 15,569 shares at $19.06 ($297K), marked as a 10b5-1 plan trade. Holdings down 82% to 3,517 shares. | SEC filing Filed Mar 6, 2026 |
| Mar 4–5, 2026 | Planned (10b5-1) | Ying Du (CEO and Director) sold 100,000 shares between Mar 4 and Mar 5 at about $19.19 ($1.9M), marked as a 10b5-1 plan trade. Holdings down 9% to 964,161 shares. | SEC filing Filed Mar 6, 2026 |
| Mar 3, 2026 | Planned (10b5-1) | Rafael Amado (President / COO) sold 10,000 shares at $17.38 ($174K), marked as a 10b5-1 plan trade. Holdings down 19% to 42,391 shares. | SEC filing Filed Mar 5, 2026 |
| Dec 31, 2025 | Sale | Rafael Amado (President / COO) sold 10,787 shares at $17.43 ($188K). Holdings down 17% to 52,391 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jan 2, 2026 |
| Dec 16, 2025 | Planned (10b5-1) | Frazor Titus Edmondson III (Chief Legal Officer) sold 8,651 shares at $17.14 ($148K), marked as a 10b5-1 plan trade. Holdings down 31% to 19,086 shares. | SEC filing Filed Dec 18, 2025 |
| Nov 21, 2025 | Planned (10b5-1) | Frazor Titus Edmondson III (Chief Legal Officer) sold 14,328 shares at $19.78 ($283K), marked as a 10b5-1 plan trade. Holdings down 34% to 27,737 shares. | SEC filing Filed Nov 25, 2025 |
| Nov 3, 2025 | Sale | Yajing Chen (CFO) sold 240 shares at $26.83 ($6K). Holdings down 1% to 17,444 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 4, 2025 |
38 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
No cluster buys in the last 12 months.
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
Follow ZLAB in the Insider Ledger app
Get the appA plain-English brief of insider purchases, 8-Ks and red flags at the companies you pick. No account needed.