ALNY Alnylam Pharmaceuticals Inc

NASDAQ
$237.10

Alnylam Pharmaceuticals Inc (ALNY) Hedge Fund Activity

This view isolates hedge funds from the broader institutional ownership shown on the Institutional tab. A pension fund tracking an index may have no view on a stock; when a hedge fund builds or exits a position, that decision can carry information. This page measures those changes. Positions as of June 30, 2026.

Based on quarterly 13F long-equity filings. Changes compare reported quarter-end positions; filings can be reported up to 45 days later and do not represent a fund's complete exposure.

Hedge fund breadth
-4.35
22 buyers / 24 sellers
MIXED
Funds compared
47
funds with comparable ALNY positions
44 current holders · 37 prior-quarter holders
Net share change
-240.3K
+1.90M added, -2.14M cut
Position activity
10 new 12 increased 21 reduced 3 exited

Most significant moves

Ranked by conviction, not size — how much of the fund's own book the position represents, how far it moved, and what kind of fund made it.

Fund Action Shares changed Change Est. value Portfolio wt. Score
Deep Track Capital Growth Healthcare New +825.0K — $248.3M 3.7% 86
Paradigm BioCapital Advisors Growth Healthcare New +480.0K — $144.5M 2.7% 81
Balyasny Asset Management L.P. New +89.5K — $26.9M 0.1% 61
CITADEL ADVISORS LLC Quant Increased +167.6K +715.8% $50.5M 0.0% 58
Soleus Capital Management Growth Healthcare Reduced -98.6K -74.9% $29.7M 0.3% 57
MARSHALL WACE, LLP Long/Short Reduced -839.5K -76.4% $252.7M 0.1% 57
J. Goldman & Co. Long/Short New +38.7K — $11.6M 0.5% 56
OrbiMed Advisors Growth Healthcare Reduced -102.0K -85.7% $30.7M 0.1% 56
Voloridge Investment Management Quant Reduced -184.7K -97.6% $55.6M 0.0% 54
Verition Fund Management Event Long/Short Sold Out -898 -100.0% $270.3K 0.0% 54

Most significant buyers

By move score, not size.

  • Deep Track Capital New · +825.0K
  • Paradigm BioCapital Advisors New · +480.0K
  • Balyasny Asset Management L.P. New · +89.5K
  • CITADEL ADVISORS LLC Increased · +167.6K
  • J. Goldman & Co. New · +38.7K

Most significant sellers

By move score, not size.

  • Soleus Capital Management Reduced · -98.6K
  • MARSHALL WACE, LLP Reduced · -839.5K
  • OrbiMed Advisors Reduced · -102.0K
  • Voloridge Investment Management Reduced · -184.7K
  • Verition Fund Management Sold Out · -898

Hedge fund positions

Fund Tier Shares Previous Change Change % Portfolio wt. Action Score
Deep Track Capital 1 825.0K 0 +825.0K — 3.7% New 86
Paradigm BioCapital Advisors 1 480.0K 0 +480.0K — 2.7% New 81
Balyasny Asset Management L.P. 2 89.5K 0 +89.5K — 0.1% New 61
CITADEL ADVISORS LLC 1 191.0K 23.4K +167.6K +715.8% 0.0% Increased 58
Soleus Capital Management 2 33.1K 131.7K -98.6K -74.9% 0.3% Reduced 57
MARSHALL WACE, LLP 2 259.8K 1.1M -839.5K -76.4% 0.1% Reduced 57
J. Goldman & Co. 3 38.7K 0 +38.7K — 0.5% New 56
OrbiMed Advisors 2 17.0K 119.0K -102.0K -85.7% 0.1% Reduced 56
Voloridge Investment Management 2 4.5K 189.2K -184.7K -97.6% 0.0% Reduced 54
Verition Fund Management 2 0 898 -898 -100.0% 0.0% Sold Out 54
Caxton Associates 3 952 0 +952 — 0.0% New 53
Hudson Bay Capital Management 3 148.7K 40.0K +108.7K +271.8% 0.3% Increased 53
CenterBook Partners 4 12.2K 0 +12.2K — 0.2% New 51
Edgestream Partners 4 0 5.8K -5.8K -100.0% 0.0% Sold Out 51
Boothbay Fund Management 4 6.2K 0 +6.2K — 0.0% New 51
Winton Group 4 7.9K 0 +7.9K — 0.1% New 51
Cinctive Capital Management 3 3.3K 0 +3.3K — 0.0% New 50
Graham Capital Management 3 2.3K 0 +2.3K — 0.0% New 49
LMR Partners 3 134.2K 74.7K +59.6K +79.8% 0.5% Increased 48
Capstone Investment Advisors 3 1.9K 753 +1.1K +152.2% 0.0% Increased 47
Quadrature Capital 3 22.7K 85.2K -62.6K -73.4% 0.1% Reduced 46
Quantbot Technologies 4 0 45 -45 -100.0% 0.0% Sold Out 45
Squarepoint Ops LLC 2 234.0K 426.7K -192.7K -45.2% 0.2% Reduced 43
Voleon Capital Management 3 5.2K 24.1K -18.9K -78.4% 0.0% Reduced 42
Brevan Howard Capital Management 3 1.1K 4.6K -3.5K -75.7% 0.0% Reduced 39
Schonfeld Strategic Advisors 3 31.1K 71.8K -40.7K -56.6% 0.1% Reduced 39
WORLDQUANT MILLENNIUM ADVISORS LLC 2 62.2K 42.2K +20.0K +47.5% 0.1% Increased 39
MILLENNIUM MANAGEMENT LLC 2 316.0K 447.9K -131.9K -29.4% 0.1% Reduced 38
Bridgewater Associates 1 99.6K 106.6K -7.0K -6.6% 0.1% Reduced 35
TWO SIGMA INVESTMENTS, LP 2 1.9M 2.0M -116.6K -5.9% 0.5% Reduced 34
Rock Springs Capital Management 3 66.8K 74.0K -7.3K -9.8% 1.0% Reduced 34
D. E. Shaw & Co., Inc. 1 1.1M 1.1M +45.0K +4.3% 0.2% Increased 33
Aquatic Capital Management 4 15.5K 31.1K -15.6K -50.2% 0.2% Reduced 33
Man Group 3 170.9K 232.4K -61.5K -26.5% 0.1% Reduced 32
AQR Capital Management 3 728.0K 913.1K -185.1K -20.3% 0.1% Reduced 31
Qube Research & Technologies Ltd 2 798.7K 838.2K -39.5K -4.7% 0.3% Reduced 31
Tremblant Capital Group 2 92.9K 94.6K -1.6K -1.7% 0.8% Reduced 30
Y-Intercept 4 6.6K 11.4K -4.8K -42.2% 0.0% Reduced 30
Capital Fund Management 3 155.9K 140.1K +15.8K +11.3% 0.3% Increased 29
Jain Global 3 55.7K 48.0K +7.7K +16.1% 0.2% Increased 28
Trexquant Investment 3 48.2K 61.8K -13.6K -22.0% 0.1% Reduced 28
Capula Management 2 13.2K 13.1K +88 +0.7% 0.1% Increased 25
Walleye Capital 3 3.2K 2.6K +516 +19.6% 0.0% Increased 25
Woodline Partners LP 2 246.3K 243.9K +2.4K +1.0% 0.2% Increased 25
Gotham Asset Management, LLC 2 42.1K 43.7K -1.7K -3.8% 0.0% Reduced 25
Engineers Gate 4 33.5K 32.5K +967 +3.0% 0.1% Increased 18
Deerfield Management 1 67.9K 67.9K 0 +0.0% 0.3% Unchanged 26

Every fund above opens. Subscribers can see any manager's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.

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Hedge funds are identified from their 13F filings, which are due 45 days after quarter end and cover long U.S.-listed equity positions only. A fund's short book never appears, so a reduced position can mean a changed view or a changed hedge — the filing doesn't say which.