AI Holders Summary · Q1 2026

143 institutions reported PSNL in Q1 2026. Merck & Co., Inc. leads at 19.1% of the visible book.

Top holders

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

Hide index funds / market makers / custodians(3 on this page)

#HolderValueShares% port.Quarter

Merck & Co., Inc.

CIK 0000310158

$89M14.0M25.60%Q1 2026 02

Lightspeed Management Company, L.L.C.

CIK 0001702122

$52M8.2M5.26%Q1 2026 03

ARK Investment Management LLC

CIK 0001697748

$51M7.9M0.39%Q1 2026 04

AMERIPRISE FINANCIAL INC

CIK 0000820027

$48M7.6M0.01%Q1 2026 05

BlackRock, Inc.

CIK 0002012383

$34M5.4M0.00%Q1 2026 06

T. Rowe Price Investment Management, Inc.

CIK 0001897612

$30M4.8M0.02%Q1 2026 07

Aberdeen Group plc

CIK 0001716774

$22M3.5M0.04%Q1 2026 08

Deep Track Capital, LP

CIK 0001856083

$19M3.0M0.31%Q1 2026 09

AIGH Capital Management LLC

CIK 0001835943

$18M2.9M2.52%Q1 2026 10

VANGUARD CAPITAL MANAGEMENT LLC

CIK 0002100119· Index

$18M2.9M0.00%Q1 2026 11

KENNEDY CAPITAL MANAGEMENT LLC

CIK 0000884589

$14M2.2M0.29%Q1 2026 12

Blue Water Life Science Advisors, LP

CIK 0001789778

$11M1.7M8.56%Q1 2026 13

PRICE T ROWE ASSOCIATES INC /MD/

CIK 0000080255

$11M1.7M0.00%Q1 2026 14

Casdin Capital, LLC

CIK 0001534261

$10M1.6M0.77%Q1 2026 15

GEODE CAPITAL MANAGEMENT, LLC

CIK 0001214717· Index

$8M1.3M0.00%Q1 2026 16

HOWLAND CAPITAL MANAGEMENT LLC

CIK 0001079112

$7M556K0.27%Q2 2026 17

STATE STREET CORP

CIK 0000093751

$7M1.1M0.00%Q1 2026 18

DIMENSIONAL FUND ADVISORS LP

CIK 0000354204· Quasi-passive

$7M1.1M0.00%Q1 2026 19

PFM Health Sciences, LP

CIK 0001442756

$6M870K0.51%Q1 2026 20

GOLDMAN SACHS GROUP INC

CIK 0000886982

$5M737K0.00%Q1 2026

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