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Merck & Co., Inc.

MRK
Exchange
NYSE
Industry
Pharmaceutical Preparations
SEC CIK
0000310158

In the last 90 days, Merck & Co., Inc. insiders filed 0 open-market purchases and 7 sales; 3,855 institutions reported holding it in 13F filings for Q2 2026, worth $254.3B in total; 4 superinvestors hold it, including Harris Associates (Oakmark) and Fairfax Financial.

13F holders, Q4 2025

Institutional positions in Merck & Co., Inc. as of Dec 31, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works

Institutional holders
3,675
+428 vs. Q3 2025
Shares held
1.96B
+60.6M (+3.2%) vs. Q3 2025
Total value
$206.6B
+$47.2B (+29.6%) vs. Q3 2025
New holders
555
1,380 more added
Sold out
127
1,404 more reduced

73 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q3 2025: new holders, sold out and not filed yet

Holders and value by quarter

Institutions reporting MRK on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.

Institutional holdersQ4 2025: 3,675 institutions
Q1 2021: 2,693 institutionsQ2 2021: 2,684 institutionsQ3 2021: 2,658 institutionsQ4 2021: 2,910 institutionsQ1 2022: 2,962 institutionsQ2 2022: 3,020 institutionsQ3 2022: 2,997 institutionsQ4 2022: 3,244 institutionsQ1 2023: 3,188 institutionsQ2 2023: 3,262 institutionsQ3 2023: 3,222 institutionsQ4 2023: 3,444 institutionsQ1 2024: 3,547 institutionsQ2 2024: 3,558 institutionsQ3 2024: 3,502 institutionsQ4 2024: 3,619 institutionsQ1 2025: 3,460 institutionsQ2 2025: 3,338 institutionsQ3 2025: 3,320 institutionsQ4 2025: 3,675 institutionsQ1 2026: 3,813 institutionsQ2 2026: 3,855 institutions
Value heldQ4 2025: $206.6B
Q1 2021: $143.2BQ2 2021: $144.3BQ3 2021: $138.8BQ4 2021: $142.2BQ1 2022: $152.1BQ2 2022: $171.5BQ3 2022: $162.7BQ4 2022: $212.2BQ1 2023: $205.1BQ2 2023: $222.8BQ3 2023: $197.7BQ4 2023: $211.6BQ1 2024: $256.9BQ2 2024: $242.3BQ3 2024: $221.8BQ4 2024: $196.9BQ1 2025: $177.7BQ2 2025: $155.9BQ3 2025: $159.8BQ4 2025: $206.6BQ1 2026: $231.9BQ2 2026: $254.3B
Institutions holding MRK and their total value by quarter
QuarterHoldersValue
Q2 20263,855$254.3B
Q1 20263,813$231.9B
Q4 20253,675$206.6B
Q3 20253,320$159.8B
Q2 20253,338$155.9B
Q1 20253,460$177.7B
Q4 20243,619$196.9B
Q3 20243,502$221.8B
Q2 20243,558$242.3B
Q1 20243,547$256.9B
Q4 20233,444$211.6B
Q3 20233,222$197.7B
Q2 20233,262$222.8B
Q1 20233,188$205.1B
Q4 20223,244$212.2B
Q3 20222,997$162.7B
Q2 20223,020$171.5B
Q1 20222,962$152.1B
Q4 20212,910$142.2B
Q3 20212,658$138.8B
Q2 20212,684$144.3B
Q1 20212,693$143.2B

Institutions, Q4 2025

Shares, value and share of portfolio for each institution holding Merck & Co., Inc.; share changes are against Q3 2025.

Institutions holding MRK in Q4 2025
InstitutionSharesValue% of portfolioChange in sharesAction
Flagship Capital Management Inc.3,071$323.3K0.23%+3,071New
Vista Investment Partners II, LLC3,072$323.3K0.14%+331+12.1%Added
Agp Franklin, LLC3,072$323.4K0.15%−131−4.1%Reduced
TBH Global Asset Management, LLC3,074$323.6K0.06%+3,074New
Range Advisory, LLC3,074$323.6K0.08%+3,074New
Paragon Financial Partners, Inc.3,081$324.3K0.20%+10.0%Added
Tarbox Family Office, Inc.3,084$324.6K0.05%−999−24.5%Reduced
Five Oceans Advisors3,085$324.7K0.11%+520+20.3%Added
TrustBank3,086$324.8K0.14%+3,086New
LeConte Wealth Management, LLC3,087$324.9K0.21%+309+11.1%Added
Comprehensive Financial Consultants Institutional, Inc.3,090$325.3K0.10%−325−9.5%Reduced
Baker Boyer National Bank3,090$325.3K0.10%+3,090New
Salomon & Ludwin, LLC3,033$325.9K0.03%+745+32.6%Added
Knollwood Investment Advisory, LLC3,100$326.3K0.03%00.0%Unchanged
Opal Capital LLC2,830$326.7K0.08%+2,830New
Elm Partners Management LLC3,108$327.2K0.01%+3,108New
Buckhead Capital Management LLC3,115$327.9K0.12%+118+3.9%Added
Rainier Family Wealth Inc3,119$328.3K0.25%+3,119New
Flaharty Asset Management, LLC3,120$328.4K0.04%+214+7.4%Added
Byrne Asset Management LLC3,122$328.6K0.18%−30−1.0%Reduced
Piscataqua Savings Bank3,135$330.0K0.23%00.0%Unchanged
Bluedoor Private Wealth, LLC3,140$330.5K0.15%+3,140New
ELCO Management Co., LLC3,140$330.5K0.21%+303+10.7%Added
Objective Capital Management, LLC3,143$330.8K0.34%00.0%Unchanged
Collective Family Office LLC3,146$331.1K0.08%−145−4.4%Reduced
Westside Investment Management, Inc.3,142$331.3K0.05%+93+3.1%Added
Berman McAleer LLC3,158$332.4K0.05%−386−10.9%Reduced
Milestones Private Investment Advisors LLC3,159$332.5K0.23%00.0%Unchanged
TD Capital Management LLC3,160$332.7K0.03%+338+12.0%Added
BKM Wealth Management, LLC3,164$333.0K0.12%−118−3.6%Reduced
Regimen Wealth, LLC3,167$333.3K0.10%+24+0.8%Added
Retirement Guys Formula LLC3,178$334.6K0.15%−7,228−69.5%Reduced
truNorth Financial Services, Inc.3,180$334.8K0.36%+3,180New
Seeds Investor LLC3,182$334.9K0.06%+3,182New
DRW Securities, LLC3,194$335.2K0.03%+3,194New
PTM Wealth Management, LLC3,124$335.7K0.19%+3,124New
Invera Wealth Advisors, LLC3,190$335.8K0.21%−45−1.4%Reduced
Cura Wealth Advisors, LLC3,197$336.6K0.13%+491+18.1%Added
Schrum Private Wealth Management LLC3,202$336.9K0.25%−46−1.4%Reduced
Bolthouse Investments, LLC3,202$337.0K0.30%00.0%Unchanged
Hoese & Co LLP3,202$337.0K0.24%00.0%Unchanged
Wiregrass Investment Management LLC3,208$337.7K0.28%+3,208New
Wealth Quarterback LLC3,212$338.1K0.12%+2+0.1%Added
Ewa, LLC3,212$338.1K0.08%+582+22.1%Added
Fortress Financial Group, LLC3,219$338.8K0.25%+29+0.9%Added
Kennedy Investment Group3,221$339.1K0.13%−195−5.7%Reduced
Bond & Devick Financial Network, Inc.3,227$339.7K0.10%00.0%Unchanged
Smallwood Wealth Investment Management, LLC3,232$340.3K0.18%−540−14.3%Reduced
Paragon Private Wealth Management, LLC3,241$341.1K0.10%+170+5.5%Added
PCB Capital LLC3,242$341.2K0.55%+3,242New
Targeted Financial Services LLC3,242$341.3K0.29%+3,242New
IFC Advisors LLC3,242$341.3K0.05%+3,242New
Harrell Investment Partners, LLC3,243$341.4K0.08%+7+0.2%Added
Liberty Wealth Management LLC3,244$341.5K0.04%+173+5.6%Added
GWN Securities Inc.3,249$342.1K0.07%−1,566−32.5%Reduced
Brookwood Investment Group LLC3,253$342.4K0.04%−665−17.0%Reduced
Platt Wealth Management LLC3,266$343.0K0.34%+3,266New
Oakmont Advisory Group, LLC3,280$345.3K0.37%+3,280New
Oxbow Advisors, LLC3,283$345.6K0.03%+400+13.9%Added
Cauble & Harre Wealth Management, Inc.3,262$346.1K0.29%+3,262New
Chelsea Counsel Co3,260$346.1K0.15%−250−7.1%Reduced
Highlander Partners, L.P.3,300$347.4K0.12%00.0%Unchanged
Veratis Advisors, Inc.2,878$349.7K0.28%+2,878New
Pzena Investment Management LLC3,324$349.9K0.00%00.0%Unchanged
Stronghold Wealth Management L.L.C.3,345$352.1K0.52%+3,345New
Genesis Wealth Advisors, LLC3,349$352.5K0.24%00.0%Unchanged
Trust Investment Advisors3,353$353.0K0.19%+3,353New
Koss-Olinger Consulting, LLC3,349$353.0K0.03%−1,340−28.6%Reduced
Hall Capital Management Co Inc3,358$353.5K0.14%−295−8.1%Reduced
Rise Advisors, LLC3,360$353.7K0.13%−380−10.2%Reduced
55 North Private Wealth, LLC3,368$354.5K0.09%+3,368New
Revisor Wealth Management LLC3,261$355.2K0.10%+87+2.7%Added
Bell Bank3,375$355.3K0.02%−294−8.0%Reduced
D.B. Root & Company, LLC3,380$355.7K0.09%+339+11.1%Added
Purkiss Capital Advisors LLC3,380$355.8K0.17%−327−8.8%Reduced
South Street Advisors LLC3,393$357.1K0.05%+706+26.3%Added
TFB Advisors LLC3,397$357.6K0.10%−237−6.5%Reduced
Post Resch Tallon Group Inc.3,399$357.8K0.30%−13−0.4%Reduced
Pathway Financial Advisors LLC3,287$357.8K0.04%00.0%Unchanged
Security National Bank of Sioux City Iowa3,402$358.1K0.23%00.0%Unchanged
Hansen & Associates Financial Group, Inc.3,059$358.3K0.20%+3,059New
Braun-Bostich & Associates Inc.3,407$358.6K0.22%+312+10.1%Added
Mainstay Capital Management LLC3,414$359.3K0.03%00.0%Unchanged
Connecticut Capital Management Group, LLC3,417$359.7K0.34%+3,417New
Dumont & Blake Investment Advisors LLC3,416$360.0K0.09%−116−3.3%Reduced
Security Financial Services, INC.3,424$360.4K0.06%+206+6.4%Added
Viawealth, LLC3,426$360.6K0.20%−1,079−24.0%Reduced
Excelsior Advisor Network LLC3,428$360.8K0.18%+3,428New
MBE Wealth Management, LLC3,431$361.1K0.15%+41+1.2%Added
Mainsail Asset Management, LLC3,438$361.9K0.16%+3,438New
Laraway Financial Inc3,443$362.4K0.24%00.0%Unchanged
Discipline Wealth Solutions, LLC3,445$362.6K0.07%+528+18.1%Added
Ballast, Inc.3,454$363.6K0.09%+6+0.2%Added
Elevatus Welath Management3,455$363.6K0.10%+3,455New
Values Added Financial LLC3,456$363.8K0.15%+79+2.3%Added
Colonial River Wealth Management, LLC3,463$364.5K0.13%+360+11.6%Added
Groesbeck Investment Management Corp3,472$365.0K0.69%−1,488−30.0%Reduced
DV Equities, LLC3,468$365.0K0.07%+3,468New
Persistent Asset Partners Ltd3,471$365.4K0.18%+3,471New
Flynn Zito Capital Management, LLC3,472$365.4K0.13%+292+9.2%Added