Who owns ZLAB
98 institutions reported holding ZLAB for 2026Q1, fewer than the 125 a quarter earlier.
98
Institutions reporting a position · as of 2026Q1 · down from 125 the quarter before
- Shares held by institutions
- 28.2M
Shares held by institutions · long US equity positions only, as reported on Form 13F
- Reported value
- $531M
Reported value · at 2026-03-31 prices, not today's
- Opened vs closed
- 17 / 44
Opened vs closed · new positions against positions exited in the latest quarter
Details›
- Reporting quarter2026-03-31
- 2026Q1
- Quarters on record
- 35
- New positions
- 17
- Positions exited
- 44
- Added to
- 23
- Reduced
- 42
| Quarter | Filers | Shares | Reported value |
|---|---|---|---|
| 2026Q1 | 98 | 28.2M | $531M |
| 2025Q4 | 125 | 28.9M | $510M |
| 2025Q3 | 137 | 35.2M | $1.19B |
| 2025Q2 | 155 | 42.6M | $1.49B |
| 2025Q1 | 159 | 56.5M | $1.97B |
| 2024Q4 | 130 | 56.4M | $1.48B |
| 2024Q3 | 103 | 45.3M | $1.09B |
| 2024Q2 | 104 | 40.5M | $702M |
| 2024Q1 | 114 | 41.2M | $660M |
| 2023Q4 | 121 | 41.1M | $1.12B |
| 2023Q3 | 120 | 39.4M | $972M |
| 2023Q2 | 136 | 42.8M | $1.21B |
| 2023Q1 | 159 | 53.0M | $1.78B |
| 2022Q4 | 163 | 58.2M | $1.80B |
| 2022Q3 | 167 | 59.3M | $2.04B |
| 2022Q2 | 161 | 60.2M | $2.09B |
| Holder | Shares | % of company | Value |
|---|---|---|---|
| RTW INVESTMENTS, LP | 6.6M | n/a | $124M |
| RA CAPITAL MANAGEMENT, L.P. | 5.7M | n/a | $107M |
| Frazier Life Sciences Management, L.P. | 1.9M | n/a | $36M |
| CITADEL ADVISORS LLC | 1.7M | n/a | $32M |
| BAMCO INC /NY/ | 1.7M | n/a | $31M |
| ADAR1 Capital Management, LLC | 1.4M | n/a | $27M |
| FMR LLC | 1.3M | n/a | $24M |
| BlackRock Inc. | 0.9M | n/a | $16M |
| Rock Springs Capital Management LP | 0.8M | n/a | $15M |
| C WorldWide Group Holding A/S | 0.5M | n/a | $9.6M |
SEC Form 13F data sets (DERA bulk files). 13F is quarterly, filed up to 45 days late, and covers long US equity positions only, no shorts, no derivatives, nothing held below the reporting threshold.
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