MRK Merck & Co., Inc.

NYSE
$143.93

Merck & Co., Inc. (MRK) 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
-17.39
19 buyers / 27 sellers
SELLING
Funds compared
49
funds with comparable MRK positions
42 current holders · 42 prior-quarter holders
Net share change
-8.95M
+2.30M added, -11.25M cut
Position activity
7 new 12 increased 20 reduced 7 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
MARSHALL WACE, LLP Long/Short Sold Out -2.78M -100.0% $357.0M 0.0% 68
Qube Research & Technologies Ltd Quant New +1.04M — $134.2M 0.2% 64
Bridgewater Associates Quant Macro New +30.3K — $3.9M 0.0% 63
Balyasny Asset Management L.P. Reduced -1.76M -96.9% $225.7M 0.0% 61
WORLDQUANT MILLENNIUM ADVISORS LLC Quant New +61.9K — $8.0M 0.0% 58
ExodusPoint Capital Management Long/Short Quant Sold Out -144.7K -100.0% $18.6M 0.0% 57
Weiss Asset Management Event Quant New +52.1K — $6.7M 0.1% 57
Capula Management Quant Macro Sold Out -220 -100.0% $28.3K 0.0% 56
Capital Fund Management Quant Macro New +11.4K — $1.5M 0.0% 55
Quadrature Capital Quant New +15.3K — $2.0M 0.0% 55

Most significant buyers

By move score, not size.

  • Qube Research & Technologies Ltd New · +1.04M
  • Bridgewater Associates New · +30.3K
  • WORLDQUANT MILLENNIUM ADVISORS LLC New · +61.9K
  • Weiss Asset Management New · +52.1K
  • Capital Fund Management New · +11.4K

Most significant sellers

By move score, not size.

  • MARSHALL WACE, LLP Sold Out · -2.78M
  • Balyasny Asset Management L.P. Reduced · -1.76M
  • ExodusPoint Capital Management Sold Out · -144.7K
  • Capula Management Sold Out · -220
  • Soleus Capital Management Reduced · -153.0K

Hedge fund positions

Fund Tier Shares Previous Change Change % Portfolio wt. Action Score
MARSHALL WACE, LLP 2 0 2.8M -2.78M -100.0% 0.0% Sold Out 68
Qube Research & Technologies Ltd 2 1.0M 0 +1.04M — 0.2% New 64
Bridgewater Associates 1 30.3K 0 +30.3K — 0.0% New 63
Balyasny Asset Management L.P. 2 56.0K 1.8M -1.76M -96.9% 0.0% Reduced 61
WORLDQUANT MILLENNIUM ADVISORS LLC 2 61.9K 0 +61.9K — 0.0% New 58
ExodusPoint Capital Management 3 0 144.7K -144.7K -100.0% 0.0% Sold Out 57
Weiss Asset Management 2 52.1K 0 +52.1K — 0.1% New 57
Capula Management 2 0 220 -220 -100.0% 0.0% Sold Out 56
Capital Fund Management 3 11.4K 0 +11.4K — 0.0% New 55
Quadrature Capital 3 15.3K 0 +15.3K — 0.0% New 55
Soleus Capital Management 2 50.0K 203.0K -153.0K -75.4% 0.2% Reduced 53
MILLENNIUM MANAGEMENT LLC 2 561.3K 2.0M -1.41M -71.5% 0.1% Reduced 53
Voleon Capital Management 3 295.5K 72.7K +222.8K +306.6% 0.7% Increased 52
Cinctive Capital Management 3 150.5K 16.7K +133.7K +800.6% 0.8% Increased 52
Hudson Bay Capital Management 3 2.2K 101.5K -99.3K -97.8% 0.0% Reduced 51
Boothbay Fund Management 4 0 25.2K -25.2K -100.0% 0.0% Sold Out 51
Y-Intercept 4 51.4K 0 +51.4K — 0.1% New 51
Lighthouse Investment Partners 3 0 2.7K -2.7K -100.0% 0.0% Sold Out 51
Point72 Asset Management, L.P. 1 380.1K 921.1K -541.0K -58.7% 0.1% Reduced 50
Verition Fund Management 2 53.6K 3.0K +50.6K +1681.4% 0.1% Increased 50
Walleye Capital 3 2.1K 174.7K -172.5K -98.8% 0.0% Reduced 50
LMR Partners 3 44.0K 3.0K +41.0K +1367.7% 0.1% Increased 49
CITADEL ADVISORS LLC 1 1.9M 3.8M -1.89M -49.4% 0.2% Reduced 49
Edgestream Partners 4 0 3.2K -3.2K -100.0% 0.0% Sold Out 49
Engineers Gate 4 0 3.9K -3.9K -100.0% 0.0% Sold Out 48
Farallon Capital Management 1 199.0K 361.0K -162.0K -44.9% 0.2% Reduced 46
Integral Health Asset Management 2 350.0K 425.0K -75.0K -17.6% 1.8% Reduced 45
Samlyn Capital 2 565.8K 726.5K -160.7K -22.1% 1.2% Reduced 44
D. E. Shaw & Co., Inc. 1 2.7M 3.4M -659.6K -19.4% 0.2% Reduced 39
ADAGE CAPITAL PARTNERS GP, L.L.C. 2 2.0M 2.7M -657.4K -24.5% 0.4% Reduced 39
Caption Management 3 11.4K 6.5K +4.9K +75.4% 0.1% Increased 38
Centiva Capital 4 5.4K 3.0K +2.4K +79.7% 0.0% Increased 37
Schonfeld Strategic Advisors 3 15.5K 34.7K -19.2K -55.2% 0.0% Reduced 36
Alyeska Investment Group, L.P. 2 2.5M 2.3M +175.0K +7.6% 0.9% Increased 35
Jain Global 3 25.0K 45.7K -20.7K -45.3% 0.0% Reduced 35
TWO SIGMA INVESTMENTS, LP 2 48.6K 64.3K -15.7K -24.4% 0.0% Reduced 34
Man Group 3 990.5K 793.2K +197.3K +24.9% 0.2% Increased 32
Capstone Investment Advisors 3 4.0K 6.5K -2.5K -38.1% 0.0% Reduced 31
Squarepoint Ops LLC 2 909.7K 830.9K +78.8K +9.5% 0.3% Increased 31
Holocene Advisors, LP 2 628.0K 572.5K +55.5K +9.7% 0.2% Increased 30
AQR Capital Management 3 8.1M 8.6M -494.2K -5.7% 0.4% Reduced 29
Woodline Partners LP 2 1.1M 1.1M +53.1K +5.0% 0.5% Increased 29
Gotham Asset Management, LLC 2 528.9K 506.6K +22.4K +4.4% 0.2% Increased 28
Chilton Investment Company 2 14.0K 14.2K -243 -1.7% 0.0% Reduced 24
Parallax Volatility Advisers 3 116.1K 117.7K -1.6K -1.4% 0.8% Reduced 23
Brevan Howard Capital Management 3 50.0K 55.0K -5.0K -9.1% 0.1% Reduced 21
OrbiMed Advisors 2 663.4K 663.4K 0 +0.0% 1.6% Unchanged 30
Systematic Alpha Investments 2 410.7K 410.7K 0 +0.0% 2.1% Unchanged 31
ADAR1 Capital Management 3 3.1K 3.1K 0 +0.0% 0.0% Unchanged 17

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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.