MRK Merck & Co., Inc.

NYSE
$143.93

Merck & Co., Inc. (MRK) Institutional Ownership

What the institutions did with MRK last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.

Managers compared
3,885
filed both this quarter and last
Managers holding
3,773
+43 on the quarter
Buyers
1,787
155 opened new
Sellers
1,607
112 sold out entirely
Buyer share
52.7%
of managers who traded it
Breadth
+5.3
net buyers, as a share of those trading

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

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Ownership map

Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.

Cut Unchanged Added Color saturates at ±50%.

Largest holders

Manager Shares % of reported
BlackRock, Inc. 227.0M 11.4%
VANGUARD CAPITAL MANAGEMENT LLC 161.3M 8.1%
STATE STREET CORP 120.4M 6.1%
WELLINGTON MANAGEMENT GROUP LLP 86.2M 4.4%
VANGUARD PORTFOLIO MANAGEMENT LLC 67.7M 3.4%
GEODE CAPITAL MANAGEMENT, LLC 60.7M 3.1%
CHARLES SCHWAB INVESTMENT MANAGEMENT INC 54.4M 2.7%
MORGAN STANLEY 48.6M 2.5%
FMR LLC 45.4M 2.3%
JPMORGAN CHASE & CO 43.9M 2.2%
Fisher Asset Management, LLC 38.5M 1.9%
NORGES BANK 37.0M 1.9%
BANK OF AMERICA CORP /DE/ 30.5M 1.5%
NORTHERN TRUST CORP 26.3M 1.3%
GOLDMAN SACHS GROUP INC 22.1M 1.1%
FRANKLIN RESOURCES INC 19.5M 1.0%
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 19.5M 1.0%
Legal & General Group Plc 18.9M 1.0%
Invesco Ltd. 18.6M 0.9%
PRICE T ROWE ASSOCIATES INC /MD/ 18.5M 0.9%
Bank of New York Mellon Corp 18.3M 0.9%
DIMENSIONAL FUND ADVISORS LP 17.5M 0.9%
AMERIPRISE FINANCIAL INC 17.4M 0.9%
Capital International Investors 15.4M 0.8%
ROYAL BANK OF CANADA 14.3M 0.7%

Largest changes

Manager Action Previous Current Change
Capital International Investors Increased 870.3K 15.4M +14.5M
Fisher Asset Management, LLC Increased 26.4M 38.5M +12.1M
JPMORGAN CHASE & CO Reduced 53.0M 43.9M -9.1M
NORDEA INVESTMENT MANAGEMENT AB Reduced 8.5M 3.5M -5.0M
Assenagon Asset Management S.A. Increased 743.2K 5.4M +4.7M
CHARLES SCHWAB INVESTMENT MANAGEMENT INC Increased 49.8M 54.4M +4.6M
PRICE T ROWE ASSOCIATES INC /MD/ Reduced 23.0M 18.5M -4.5M
JENNISON ASSOCIATES LLC Reduced 6.2M 2.7M -3.5M
FRANKLIN RESOURCES INC Increased 16.3M 19.5M +3.3M
Invesco Ltd. Reduced 21.9M 18.6M -3.2M
MARSHALL WACE, LLP Sold Out 2.8M 0 -2.8M
DIAMANT ASSET MANAGEMENT, INC. Reduced 2.1M 16.4K -2.1M
DIMENSIONAL FUND ADVISORS LP Increased 15.5M 17.5M +2.0M
California Public Employees Retirement System Reduced 7.4M 5.4M -2.0M
GOLDMAN SACHS GROUP INC Increased 20.1M 22.1M +1.9M
WELLINGTON MANAGEMENT GROUP LLP Increased 84.3M 86.2M +1.9M
CITADEL ADVISORS LLC Reduced 3.8M 1.9M -1.9M
FIRST TRUST ADVISORS LP Reduced 4.5M 2.6M -1.9M
ALLIANCEBERNSTEIN L.P. Increased 11.3M 13.1M +1.8M
Balyasny Asset Management L.P. Reduced 1.8M 56.0K -1.8M
Amundi Reduced 13.8M 12.3M -1.4M
LAZARD ASSET MANAGEMENT LLC Reduced 3.3M 1.8M -1.4M
MILLENNIUM MANAGEMENT LLC Reduced 2.0M 561.3K -1.4M
SG Americas Securities, LLC Increased 1.7M 3.1M +1.4M
Employees Provident Fund Board Reduced 1.9M 535.5K -1.4M
VOYA INVESTMENT MANAGEMENT LLC Increased 5.2M 6.5M +1.3M
GEODE CAPITAL MANAGEMENT, LLC Increased 59.6M 60.7M +1.2M
BlackRock, Inc. Increased 225.8M 227.0M +1.2M
AMERIPRISE FINANCIAL INC Increased 16.3M 17.4M +1.1M
ROYAL BANK OF CANADA Increased 13.2M 14.3M +1.1M
STATE STREET CORP Increased 119.3M 120.4M +1.1M
OMERS ADMINISTRATION Corp Reduced 1.6M 547.6K -1.1M
Qube Research & Technologies Ltd New 0 1.0M +1.0M
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP Increased 2.9M 4.0M +1.0M
MORGAN STANLEY Increased 47.6M 48.6M +1.0M
Artisan Partners Limited Partnership Reduced 1.1M 87.2K -974.6K
Beutel, Goodman & Co Ltd. Reduced 3.0M 2.1M -956.7K
BNP PARIBAS FINANCIAL MARKETS Increased 2.2M 3.1M +924.7K
FMR LLC Increased 44.5M 45.4M +924.3K
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC Reduced 20.4M 19.5M -867.6K
CITIGROUP INC Increased 2.8M 3.6M +835.8K
MUFG Securities EMEA plc Increased 101.8K 926.7K +824.9K
Temasek Holdings (Private) Ltd New 0 816.1K +816.1K
NORTHERN TRUST CORP Reduced 27.1M 26.3M -814.3K
JANE STREET GROUP, LLC Increased 351.1K 1.1M +769.9K
BARCLAYS PLC Reduced 7.6M 6.8M -763.6K
Ensign Peak Advisors, Inc Increased 2.6M 3.4M +751.8K
BANK OF MONTREAL /CAN/ Increased 4.8M 5.6M +734.6K
BANK OF NOVA SCOTIA Increased 1.5M 2.2M +734.5K
Swedbank AB Reduced 7.1M 6.4M -731.1K
SCHRODER INVESTMENT MANAGEMENT GROUP Increased 1.8M 2.5M +699.4K
Susquehanna Portfolio Strategies, LLC Reduced 791.7K 97.5K -694.3K
AMERICAN CENTURY COMPANIES INC Reduced 5.5M 4.9M -681.9K
Legal & General Group Plc Reduced 19.5M 18.9M -665.2K
D. E. Shaw & Co., Inc. Reduced 3.4M 2.7M -659.6K
BI Asset Management Fondsmaeglerselskab A/S Reduced 1.1M 468.6K -659.1K
ADAGE CAPITAL PARTNERS GP, L.L.C. Reduced 2.7M 2.0M -657.4K
HRT FINANCIAL LP Increased 142.7K 800.0K +657.3K
Caisse de depot et placement du Quebec Increased 3.8M 4.4M +648.7K
NEW YORK STATE COMMON RETIREMENT FUND Reduced 3.5M 2.9M -606.2K

13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.