Ying du is CEO & Chairman at Zai Lab Ltd (ZLAB). They have made 23 open-market trades across 1 company since 2021, most recently 2026-07-02.
CIK 0001731790
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 23 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| ZLAB | 1,221,401 | $28.3M |
Shares reported on the most recent Form 4, priced at the 2026-07-06 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| ZLAB | SELL | 2026-06-30 | 2026-07-01 | $18.53 | $130K | +0.1% | -5.3% | +34.3% |
| ZLAB | SELL | 2026-06-26 | 2026-06-29 | $17.46 | $429K | +10.9% | -0.9% | +38.8% |
| ZLAB | SELL · 10b5-1 | 2026-05-15 | 2026-05-19 | $19.87 | $2.0M | -6.3% | -0.4% | +40.7% |
| ZLAB | SELL · 10b5-1 | 2026-05-13 | 2026-05-15 | $20.03 | $2.0M | -3.9% | -7.8% | +35.2% |
| ZLAB | SELL | 2026-04-06 | 2026-04-08 | $20.45 | $54K | +19.3% | -12.2% | -8.6% |
| ZLAB | SELL | 2026-04-02 | 2026-04-03 | $20.39 | $114K | +13.9% | +4.0% | -6.3% |
| ZLAB | SELL | 2026-03-11 | 2026-03-12 | $19.08 | $20K | -7.3% | +13.2% | -8.4% |
| ZLAB | SELL | 2026-03-06 | 2026-03-10 | $19.22 | $1.9M | -5.9% | +7.9% | -14.2% |
| ZLAB | SELL | 2026-03-04 | 2026-03-06 | $19.19 | $1.9M | -2.0% | +6.7% | -9.6% |
| ZLAB | SELL · 10b5-1 | 2025-08-12 | 2025-08-14 | $35.04 | $5.0M | -3.5% | -10.2% | -38.4% |
| ZLAB | SELL · 10b5-1 | 2025-08-08 | 2025-08-12 | $34.69 | $3.5M | -0.3% | -7.5% | -37.7% |
| ZLAB | SELL | 2025-07-02 | 2025-07-03 | $35.23 | $498K | -1.1% | +6.1% | -3.9% |
| ZLAB | SELL | 2025-06-30 | 2025-07-01 | $35.52 | $491K | -2.6% | +7.4% | -6.4% |
| ZLAB | SELL | 2025-06-26 | 2025-06-27 | $36.13 | $1.7M | -6.0% | +6.7% | -12.8% |
| ZLAB | SELL · 10b5-1 | 2025-05-13 | 2025-05-15 | $28.34 | $5.5M | +3.2% | +38.5% | +21.5% |
| ZLAB | SELL · 10b5-1 | 2025-05-09 | 2025-05-13 | $29.53 | $5.9M | +8.4% | +48.9% | +19.9% |
| ZLAB | SELL | 2025-04-04 | 2025-04-07 | $33.11 | $195K | -3.1% | -4.7% | +19.2% |
| ZLAB | SELL | 2025-04-02 | 2025-04-03 | $35.89 | $417K | -11.5% | -9.8% | +3.4% |
| ZLAB | SELL · 10b5-1 | 2025-03-04 | 2025-03-06 | $34.48 | $6.6M | +5.4% | -20.0% | +0.3% |
| ZLAB | SELL · 10b5-1 | 2025-02-28 | 2025-03-04 | $33.45 | $6.6M | +8.9% | +4.6% | -11.1% |
| ZLAB | SELL | 2024-07-01 | 2024-07-02 | $17.48 | $245K | +3.2% | +5.7% | +38.4% |
| ZLAB | SELL | 2024-06-26 | 2024-06-27 | $17.90 | $857K | -0.5% | +9.7% | +18.7% |
| ZLAB | SELL | 2024-04-02 | 2024-04-03 | $16.15 | $93K | -9.7% | +3.3% | +10.4% |
| ZLAB | SELL | 2024-01-03 | 2024-01-03 | $26.12 | $438K | -7.9% | -14.9% | -39.3% |
| ZLAB | SELL | 2021-09-07 | 2021-09-08 | $150.73 | $8.9M | -14.8% | -29.7% | -51.6% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.