AI Holders Summary · Q1 2026

109 institutions reported ZLAB in Q1 2026. RTW INVESTMENTS, LP leads at 25.4% of the visible book.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

Hide index funds / market makers / custodians(1 on this page)

#HolderValueShares% port.Quarter

RTW INVESTMENTS, LP

CIK 0001493215

$124M6.6M1.23%Q1 2026 02

RA CAPITAL MANAGEMENT, L.P.

CIK 0001346824

$107M5.7M1.14%Q1 2026 03

Frazier Life Sciences Management, L.P.

CIK 0001892134

$36M1.9M0.92%Q1 2026 04

BAMCO INC /NY/

CIK 0001017918

$31M1.7M0.09%Q1 2026 05

CITADEL ADVISORS LLC

CIK 0001423053

$31M1.7M0.00%Q4 2025 06

ADAR1 Capital Management, LLC

CIK 0001940272

$27M1.4M1.58%Q1 2026 07

FMR LLC

CIK 0000315066

$24M1.3M0.00%Q1 2026 08

BlackRock, Inc.

CIK 0002012383

$16M865K0.00%Q1 2026 09

Rock Springs Capital Management LP

CIK 0001595725

$15M815K0.90%Q1 2026 10

C WorldWide Group Holding A/S

CIK 0001625244

$10M510K0.21%Q1 2026 11

UBS Group AG

CIK 0001610520

$9M504K0.00%Q1 2026 12

JANE STREET GROUP, LLC

CIK 0001595888· Market maker

$9M467K0.00%Q1 2026 13

B Group, Inc.

CIK 0002043476

$8M451K6.28%Q1 2026 14

SCHRODER INVESTMENT MANAGEMENT GROUP

CIK 0001086619

$7M393K0.01%Q1 2026 15

NAN FUNG TRINITY (HK) Ltd

CIK 0001781880

$7M346K0.65%Q2 2026 16

TWO SIGMA INVESTMENTS, LP

CIK 0001179392

$6M310K0.00%Q1 2026 17

PRICE T ROWE ASSOCIATES INC /MD/

CIK 0000080255

$5M292K0.00%Q1 2026 18

SUPERSTRING CAPITAL MANAGEMENT LP

CIK 0001931118

$5M276K3.71%Q1 2026 19

AMERIPRISE FINANCIAL INC

CIK 0000820027

$5M244K0.00%Q1 2026 20

Aberdeen Group plc

CIK 0001716774

$4M238K0.01%Q1 2026

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