Zai Lab (ZLAB): RTW Investments, LP added to its stake +628K shares

3.14M

Shares reported · +628K vs prior quarter

1.7%

Disclosed portfolio weight

$113M

Reported value

Holdings as of

Mar 31, 2025

Filed

May 15, 2025

The story around this disclosure

Every dated public record OQRO holds about the company from 60 days before to 120 days after, oldest first. It shows what was going on; none of it is a stated reason for the trade.

1. Mar 17, 2025InsiderOfficer sold ~$115K of ZLAB shares in the open market
2. Apr 2, 2025Insider · 5 peopleInsiders: 5 sales (~$1.2M)
3. Apr 4, 2025Insider · 5 peopleInsiders: 5 sales (~$401K)
4. May 9, 2025Insider · 2 peopleInsiders: 3 sales (~$2.2M)
5. May 12, 2025Insider · 1 personInsiders: 2 sales (~$1.5M)
6. May 13, 2025Insider · 1 personInsiders: 2 sales (~$1.4M)
7. May 14, 2025Insider · 1 personInsiders: 2 sales (~$1.3M)

What came next

1. Jun 2, 2025InsiderCFO sold ~$289K of ZLAB shares in the open market
2. Jun 20, 2025InsiderDirector sold ~$493K of ZLAB shares in the open market
3. Jun 26, 2025Insider · 3 peopleInsiders: 3 sales (~$1.2M)
4. Jun 30, 2025InsiderCEO sold ~$246K of ZLAB shares in the open market
5. Jul 2, 2025InsiderCEO sold ~$249K of ZLAB shares in the open market
6. Aug 8, 2025Insider · 3 peopleInsiders: 3 sales (~$2.0M)
7. Aug 11, 2025InsiderCEO sold ~$1.73M of ZLAB shares in the open market
8. Aug 12, 2025InsiderCEO sold ~$1.71M of ZLAB shares in the open market
9. Aug 13, 2025InsiderCEO sold ~$1.65M of ZLAB shares in the open market
10. Aug 15, 2025Insider · 1 personInsiders: 2 sales (~$51K)
11. Aug 18, 2025Insider · 2 peopleInsiders: 2 sales (~$309K)
12. Sep 10, 2025Insider · First insider buy since May 2024Officer purchased ~$289K of ZLAB shares in the open market

How to read SEC Form 13F-HR

Form 13F is the quarterly report in which investment managers that oversee $100 million or more list the US-listed stocks and some other securities they held on the last day of the quarter.

Full guide: What is an SEC Form 13F?

What else is on file for Zai Lab

For Zai Lab, OQRO holds 1 insider filing (SEC Form 4 or Form 144) dated in the last 90 days.

These are records OQRO holds, counted by their date, not a measure of how much trading took place. Routine paperwork such as option exercises and tax withholding is left out. Everything for the company is on its ZLAB page.

How this filing works

• SEC Form 13F

Other disclosures at Zai Lab

• SEC Form 4Nov 13, 2026
• SEC Form 13F-HRMay 15, 2026
• SEC Form 13F-HRMay 15, 2026
• SEC Form 13F-HRFeb 17, 2026
• SEC Form 13F-HRFeb 13, 2026
• SEC Form 13F-HRNov 14, 2025

Everything OQRO holds on this company is on its ZLAB page.