Ticker · CUSIP 58933Y105

MRK

MERCK & CO INC
Healthcare·Drug Manufacturers - General
···Share
Holders (tracked)
29
Combined shares
234,284,609
Combined value
$22.69B
Last close
$115.46
Quarter
2025Q4
Tracked holders · last 8 quarters
+5 vs previous quarter over the last 8.
29262024Q12025Q4
Price is +19.2% vs the avg quarter-end implied price across tracked holders.

SEC event timeline

30 events
  1. AQR Capital Management added2026-02-17
    +591,264 shares · 2025Q4
    13F
  2. D.E. Shaw & Co. added2026-02-17
    +50,612 shares · 2025Q4
    13F
  3. T. Rowe Price added2026-02-17
    +5,152,069 shares · 2025Q4
    13F
  4. Wellington Management added2026-02-17
    +11,156,354 shares · 2025Q4
    13F
  5. Paul Tudor Jones (Tudor Investment) opened position2026-02-17
    +874,300 shares · 2025Q4
    13F
  6. Jeremy Grantham (GMO) added2026-02-17
    +244,795 shares · 2025Q4
    13F
  7. Bill Nygren (Harris / Oakmark) added2026-02-17
    +4,265,097 shares · 2025Q4
    13F
  8. Ken Griffin (Citadel Advisors) added2026-02-17
    +5,853,277 shares · 2025Q4
    13F
  9. Two Sigma Investments trimmed2026-02-17
    −1,894,276 shares · 2025Q4
    13F
  10. Izzy Englander (Millennium Mgmt) added2026-02-17
    +6,036,983 shares · 2025Q4
    13F
  11. Steve Cohen (Point72) added2026-02-17
    +75,696 shares · 2025Q4
    13F
  12. Dodge & Cox trimmed2026-02-13
    −16,070 shares · 2025Q4
    13F
  13. Ray Dalio (Bridgewater Associates) trimmed2026-02-13
    −203,722 shares · 2025Q4
    13F
  14. Norges Bank (Norway SWF) opened position2026-02-10
    +37,981,502 shares · 2025Q4
    13F
  15. Ken Fisher (Fisher Asset Mgmt) added2026-02-09
    +805,201 shares · 2025Q4
    13F
  16. Bill Smead (Smead Capital) trimmed2026-02-09
    −196,374 shares · 2025Q4
    13F
  17. Mario Gabelli (GAMCO) added2026-02-05
    +1,915 shares · 2025Q4
    13F
  18. AQR Capital Management added2025-11-14
    +1,870,827 shares · 2025Q3
    13F
  19. Izzy Englander (Millennium Mgmt) trimmed2025-11-14
    −226,426 shares · 2025Q3
    13F
  20. Steve Cohen (Point72) added2025-11-14
    +1,256,953 shares · 2025Q3
    13F
  21. Two Sigma Investments trimmed2025-11-14
    −469,247 shares · 2025Q3
    13F
  22. D.E. Shaw & Co. trimmed2025-11-14
    −6,899,937 shares · 2025Q3
    13F
  23. T. Rowe Price added2025-11-14
    +2,803,331 shares · 2025Q3
    13F
  24. Wellington Management trimmed2025-11-14
    −1,577,388 shares · 2025Q3
    13F
  25. Bill Nygren (Harris / Oakmark) added2025-11-14
    +692,290 shares · 2025Q3
    13F
  26. Ray Dalio (Bridgewater Associates) trimmed2025-11-13
    −636,779 shares · 2025Q3
    13F
  27. Jeremy Grantham (GMO) added2025-11-13
    +155,777 shares · 2025Q3
    13F
  28. Renaissance Technologies exited2025-11-13
    −139,820 shares · 2025Q3
    13F
  29. Norges Bank (Norway SWF) exited2025-11-13
    −36,111,289 shares · 2025Q3
    13F
  30. Dodge & Cox trimmed2025-11-13
    −3,025 shares · 2025Q3
    13F

Insider activity

No insider transactions in the last 30 days.
View full insider history for MRK →
Follow-the-investor returns
If you'd copied each holder of MRK…
Cost basis inferred from 13F share-delta history. Sorted by % return on the position they're still holding.
InvestorFirst inCost basisReturnPosition value today
T. Rowe Price2016Q1$20.30+468.8%$2.17B
Dodge & Cox2016Q1$53.03+117.7%$16.0M
Mario Gabelli (GAMCO)2016Q1$78.62+46.9%$7.5M
Prem Watsa (Fairfax Financial)2020Q4$80.44+43.5%$20.0M
Ken Fisher (Fisher Asset Mgmt)2016Q1$80.80+42.9%$2.87B
Bill Smead (Smead Capital)2016Q1$82.34+40.2%$327.7M
Ray Dalio (Bridgewater Associates)2016Q1$87.21+32.4%$35.8M
AQR Capital Management2016Q1$88.05+31.1%$1.30B
Ken Griffin (Citadel Advisors)2016Q1$89.65+28.8%$450.4M
Ken Griffin (Citadel Advisors)2016Q1$89.65+28.8%$450.4M
Ken Griffin (Citadel Advisors)2016Q1$89.65+28.8%$450.4M
Jeremy Grantham (GMO)2016Q3$92.37+25.0%$793.2M
Wellington Management2016Q1$92.56+24.7%$9.98B
Paul Tudor Jones (Tudor Investment)2016Q1$96.83+19.2%$74.1M
Paul Tudor Jones (Tudor Investment)2016Q1$96.83+19.2%$74.1M
Bill Nygren (Harris / Oakmark)2024Q3$100.16+15.3%$1.63B
D.E. Shaw & Co.2016Q1$101.06+14.2%$406.2M
D.E. Shaw & Co.2016Q1$101.06+14.2%$406.2M
D.E. Shaw & Co.2016Q1$101.06+14.2%$406.2M
Izzy Englander (Millennium Mgmt)2016Q1$104.21+10.8%$143.3M
Izzy Englander (Millennium Mgmt)2016Q1$104.21+10.8%$143.3M
Izzy Englander (Millennium Mgmt)2016Q1$104.21+10.8%$143.3M
Steve Cohen (Point72)2016Q3$104.27+10.7%$75.3M
Steve Cohen (Point72)2016Q3$104.27+10.7%$75.3M
Steve Cohen (Point72)2016Q3$104.27+10.7%$75.3M
Two Sigma Investments2016Q1$105.53+9.4%$577K
Two Sigma Investments2016Q1$105.53+9.4%$577K
Two Sigma Investments2016Q1$105.53+9.4%$577K
Norges Bank (Norway SWF)2016Q1$614.42-81.2%$4.39B

Who moved on this name in 2025Q4

13F transactions reported for the latest quarter, grouped by direction.
New positions2
Added to11
Trimmed4
Exited0
—

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.
QuarterHoldersCombined value
2022Q1
27
$1.93T
2022Q2
26
$2.16T
2022Q3
29
$2.09B
2022Q4
29
$36.11B
2023Q1
29
$35.72B
2023Q2
28
$39.83B
2023Q3
30
$28.38B
2023Q4
27
$30.32B
2024Q1
26
$49.73B
2024Q2
32
$45.74B
2024Q3
30
$18.98B
2024Q4
27
$9.99B
2025Q1
27
$14.76B
2025Q2
27
$15.59B
2025Q3
24
$12.85B
2025Q4
29
$22.69B
Congress members trading this stock
DateMemberTypeAmount rangeFiling
2026-02-04Josh GottheimerBuy$1K – $15KPDF ↗
2025-12-19Gilbert CisnerosBuy$1K – $15KPDF ↗
2025-12-18Julie JohnsonSell$1K – $15KPDF ↗
2025-11-18Gilbert CisnerosBuy$1K – $15KPDF ↗
2025-11-13Julie JohnsonSell (P)$1K – $15KPDF ↗
2025-09-23Valerie HoyleSell$1K – $15KPDF ↗
2025-08-28Marjorie Taylor GreeneBuy$1K – $15KPDF ↗
2025-08-14Julie JohnsonSell (P)$1K – $15KPDF ↗
2025-08-05Gilbert CisnerosBuy$1K – $15KPDF ↗
2025-08-04Lisa McClainSell$1K – $15KPDF ↗
2025-07-11Ritchie John TorresSell$1K – $15KPDF ↗
2025-06-24Lisa McClainBuy$1K – $15KPDF ↗

Who owns MRK

29 super-investors · 2025Q4
Tracked stake
234.28M
shares
Combined value
$22.69B
% of shares outstanding
—
shares-out unknown
Quarter action mix
New3Added19Trim6Held1
#ManagerSharesValue
1Wellington Management86.44M$9.10B
2Norges Bank
Norway SWF
37.98M$4.00B
3Ken Fisher
Fisher Asset Mgmt
24.87M$2.62B
4Bill Nygren
Harris / Oakmark
14.09M$1.48B
5AQR Capital Management11.25M$1.18B
6Jeremy Grantham
GMO
6.87M$723M
7Ken Griffin
Citadel Advisors
6.82M$718M
8Izzy Englander
Millennium Mgmt
6.80M$716M
9Ken Griffin
Citadel Advisors
3.90M$411M
10D.E. Shaw & Co.3.52M$370M
11Ken Griffin
Citadel Advisors
3.38M$356M
12Bill Smead
Smead Capital
2.84M$299M
13Steve Cohen
Point72
1.34M$141M
14Izzy Englander
Millennium Mgmt
1.24M$131M
15D.E. Shaw & Co.723.7K$76M
16D.E. Shaw & Co.689.7K$73M
17Steve Cohen
Point72
652.1K$69M
18Paul Tudor Jones
Tudor Investment
642.2K$68M
19Izzy Englander
Millennium Mgmt
414.9K$44M
20Ray Dalio
Bridgewater Associates
310.2K$33M
21Paul Tudor Jones
Tudor Investment
232.1K$24M
22Prem Watsa
Fairfax Financial
172.9K$18M
23Dodge & Cox138.2K$15M
24Two Sigma Investments74.8K$8M
25Mario Gabelli
GAMCO
65.0K$7M
26Steve Cohen
Point72
61.8K$7M
27T. Rowe Price18.75M$2M
28Two Sigma Investments13.7K$1M
29Two Sigma Investments5.0K$526K

Recent moves

20 transactions
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