Stock Ownership/ALNY

Alnylam Pharmaceuticals (ALNY): Ownership & Insider Activity

Hedge funds and institutional managers reporting a position in ALNY · Health Care. Based on the most recent 13F filing from each holder, sourced from SEC EDGAR.

Reported Holders
30
13F filers
Aggregate Value
$3.6B
Across holders
Last Price
$236.01
2026-08-24
Sector
Health Care
GICS
Quarterly fund activity13 increased16 reduced1 exited
Full exits: Verition Fund Management LLC
Institutional Holders of ALNY
↗
30 holders
Manager⇅Type⇅Shares⇅Market Value▼% of Total⇅% of Portfolio⇅Action⇅QoQ Change⇅Quarter⇅
BAILLIE GIFFORD & CO
CIK 0001088875
Institutional Manager2.44M$734.5M20.2%0.7%Reduced+$17.3MQ2 2026
DODGE & COX
CIK 0000200217
Institutional Manager1.96M$588.6M16.2%0.3%Added+$7.9MQ2 2026
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
Hedge Fund1.88M$564.7M15.5%0.4%Reduced$-35.1MQ2 2026
Clearbridge Investments, LLC
CIK 0001348883
Hedge Fund1.26M$379.1M10.4%0.3%Reduced$-29.1MQ2 2026
SHAW D E & CO INC
CIK 0001009207
Hedge Fund1.10M$332.4M9.1%0.2%Added+$328.5MQ2 2026
Qube Research & Technologies Ltd
CIK 0001729829
Hedge Fund799K$240.4M6.6%0.2%Reduced$-11.9MQ2 2026
AQR CAPITAL MANAGEMENT LLC
CIK 0001167557
Hedge Fund728K$219.0M6.0%0.1%Reduced+$219.0MQ2 2026
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
Hedge Fund316K$95.1M2.6%0.0%Reduced+$88.3MQ2 2026
MARSHALL WACE, LLP
CIK 0001318757
Hedge Fund260K$78.2M2.1%0.1%Reduced$-367.6MQ2 2026
Woodline Partners LP
CIK 0001784547
Hedge Fund246K$74.1M2.0%0.2%Added+$722KQ2 2026
BAILLIE GIFFORD & COReduced
Institutional Manager
$734.5M· 20.2% of total· 0.7% port· 2.44M sh· +$17.3M QoQ· Q2 2026
DODGE & COXAdded
Institutional Manager
$588.6M· 16.2% of total· 0.3% port· 1.96M sh· +$7.9M QoQ· Q2 2026
TWO SIGMA INVESTMENTS, LPReduced
Hedge Fund
$564.7M· 15.5% of total· 0.4% port· 1.88M sh· $-35.1M QoQ· Q2 2026
Clearbridge Investments, LLCReduced
Hedge Fund
$379.1M· 10.4% of total· 0.3% port· 1.26M sh· $-29.1M QoQ· Q2 2026
SHAW D E & CO INCAdded
Hedge Fund
$332.4M· 9.1% of total· 0.2% port· 1.10M sh· +$328.5M QoQ· Q2 2026
Qube Research & Technologies LtdReduced
Hedge Fund
$240.4M· 6.6% of total· 0.2% port· 799K sh· $-11.9M QoQ· Q2 2026
AQR CAPITAL MANAGEMENT LLCReduced
Hedge Fund
$219.0M· 6.0% of total· 0.1% port· 728K sh· +$219.0M QoQ· Q2 2026
MILLENNIUM MANAGEMENT LLCReduced
Hedge Fund
$95.1M· 2.6% of total· 0.0% port· 316K sh· +$88.3M QoQ· Q2 2026
MARSHALL WACE, LLPReduced
Hedge Fund
$78.2M· 2.1% of total· 0.1% port· 260K sh· $-367.6M QoQ· Q2 2026
Woodline Partners LPAdded
Hedge Fund
$74.1M· 2.0% of total· 0.2% port· 246K sh· +$722K QoQ· Q2 2026
Squarepoint Ops LLCReduced
Hedge Fund
$70.4M· 1.9% of total· 0.1% port· 234K sh· +$49.6M QoQ· Q2 2026
CITADEL ADVISORS LLCAdded
Hedge Fund
$57.5M· 1.6% of total· 0.0% port· 191K sh· +$35.1M QoQ· Q2 2026
Man Group plcReduced
Hedge Fund
$51.4M· 1.4% of total· 0.1% port· 171K sh· $-29.3M QoQ· Q2 2026
Hudson Bay Capital Management LPAdded
Hedge Fund
$44.8M· 1.2% of total· 0.1% port· 149K sh· +$20.7M QoQ· Q2 2026
Bridgewater Associates, LPReduced
Hedge Fund
$30.0M· 0.8% of total· 0.1% port· 100K sh· $-2.1M QoQ· Q2 2026
BALYASNY ASSET MANAGEMENT LLCAdded
Hedge Fund
$26.9M· 0.7% of total· 0.0% port· 90K sh· — QoQ· Q2 2026
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPAdded
Hedge Fund
$14.9M· 0.4% of total· 0.0% port· 50K sh· — QoQ· Q2 2026
Gotham Asset Management, LLCReduced
Hedge Fund
$12.7M· 0.3% of total· 0.0% port· 42K sh· $-499K QoQ· Q2 2026
Schonfeld Strategic Advisors LLCReduced
Hedge Fund
$9.4M· 0.3% of total· 0.0% port· 31K sh· $-12.2M QoQ· Q2 2026
ORBIMED ADVISORS LLCReduced
Hedge Fund
$5.1M· 0.1% of total· 0.1% port· 17K sh· $-30.7M QoQ· Q2 2026
FRED ALGER MANAGEMENT, LLCUnchanged
Hedge Fund
$3.8M· 0.1% of total· 0.0% port· 13K sh· +$0 QoQ· Q2 2026
Fisher Asset Management, LLCAdded
Institutional Manager
$1.9M· 0.1% of total· 0.0% port· 6K sh· +$62K QoQ· Q2 2026
Rockefeller Capital Management L.P.Reduced
Hedge Fund
$1.9M· 0.1% of total· 0.0% port· 6K sh· $-75K QoQ· Q2 2026
VOLORIDGE INVESTMENT MANAGEMENT, LLCReduced
Hedge Fund
$1.4M· 0.0% of total· 0.0% port· 5K sh· $-55.6M QoQ· Q2 2026
Walleye Capital LLCAdded
Hedge Fund
$950K· 0.0% of total· 0.0% port· 3K sh· $-826K QoQ· Q2 2026
TCW GROUP INCAdded
Hedge Fund
$673K· 0.0% of total· 0.0% port· 2K sh· +$40K QoQ· Q2 2026
CAPSTONE INVESTMENT ADVISORS, LLCAdded
Hedge Fund
$572K· 0.0% of total· 0.0% port· 2K sh· +$345K QoQ· Q2 2026
Brevan Howard Capital Management LPReduced
Hedge Fund
$338K· 0.0% of total· 0.0% port· 1K sh· $-1.1M QoQ· Q2 2026
PineBridge Investments, L.P.Added
Hedge Fund
$300K· 0.0% of total· 0.0% port· 657 sh· — QoQ· Q3 2025
CAXTON ASSOCIATES LLPAdded
Hedge Fund
$287K· 0.0% of total· 0.0% port· 952 sh· — QoQ· Q2 2026
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