13F Insight
DOSSIER · 13F Holders · Q2 2026
ALNY 1 09/15/27

ALNYLAM PHARMACEUTICALS INC

53 institutions still hold ALNYLAM PHARMACEUTICALS INC as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 02043QAB3·53 13F holders·last filed Jun 30, 2026
Market cap
—
13F value held
$430M
visible holders
Holders
53
filers reporting
Concentration
18.17%
STEELHEAD PARTNERS LLC #1
top holder share
AI Holders Summary · Q2 2026

53 institutions reported ALNY 1 09/15/27 in Q2 2026. STEELHEAD PARTNERS LLC leads at 18.2% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
STEELHEAD PARTNERS LLC
CIK 0001133521
$78M65.0M5.57%Q2 202602
BNP PARIBAS FINANCIAL MARKETS
CIK 0001166588
$51M42.3M0.02%Q2 202603
Boussard & Gavaudan Investment Management LLP
CIK 0001614986
$41M32K3.85%Q1 202604
Alberta Investment Management Corp
CIK 0001463559· Sovereign
$30M25.0M0.17%Q2 202605
BOUSSARD & GAVAUDAN GESTION SAS
CIK 0001569001
$30M25K1.49%Q2 202606
DeepCurrents Investment Group LLC
CIK 0001754535
$29M24.0M0.88%Q2 202607
BANK OF AMERICA CORP /DE/
CIK 0000070858
$23M18.8M0.00%Q2 202608
FMR LLC
CIK 0000315066
$21M17.1M0.00%Q2 202609
MACKAY SHIELDS LLC
CIK 0000061227
$18M14.8M0.60%Q2 202610
MANUFACTURERS LIFE INSURANCE COMPANY, THE
CIK 0000928047
$17M13.8M0.01%Q2 202611
Universal- Beteiligungs- und Servicegesellschaft mbH
CIK 0002057170
$13M10.5M0.02%Q2 202612
BNP Paribas Asset Management Holding S.A.
CIK 0001520354
$11M9.6M0.01%Q2 202613
STATE STREET CORP
CIK 0000093751
$11M9.3M0.00%Q2 202614
CSS LLC/IL
CIK 0001103646
$11M9.1M0.42%Q2 202615
AMERIPRISE FINANCIAL INC
CIK 0000820027
$11M8.9M0.00%Q2 202616
BlackRock, Inc.
CIK 0002012383
$10M8.0M0.00%Q2 202617
TORONTO DOMINION BANK
CIK 0000947263
$8M6.5M0.01%Q2 202618
CITIGROUP INC
CIK 0000831001
$8M6.3M0.00%Q2 202619
AXA Investment Managers S.A.
CIK 0001826635
$6M1.4M0.02%Q3 202520
ZAZOVE ASSOCIATES LLC
CIK 0001009012
$6M5.1M0.50%Q2 2026
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