Ticker · CUSIP 58933Y105

MRK

MERCK & CO INC
Healthcare·Drug Manufacturers - General
···Share
Holders (tracked)
29
Combined shares
234,284,609
Combined value
$24.66B
Last close
$119.07
Quarter
2025Q4
Price · 1Y$119.07+43.80 (+58.20%)H $123.18 · L $70.89 · Avg Vol 13.3M
Congress buyCongress sell
$80.00$100.00$120.00VolJul 25Oct 25Jan 26Apr 26
Tracked holders · last 8 quarters
+5 vs previous quarter over the last 8.
29262024Q12025Q4
Price is +13.1% 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
    Position
  2. D.E. Shaw & Co. added2026-02-17
    +50,612 shares · 2025Q4
    Position
  3. T. Rowe Price added2026-02-17
    +5,152,069 shares · 2025Q4
    Position
  4. Wellington Management added2026-02-17
    +11,156,354 shares · 2025Q4
    Position
  5. Paul Tudor Jones (Tudor Investment) opened position2026-02-17
    +874,300 shares · 2025Q4
    Position
  6. Jeremy Grantham (GMO) added2026-02-17
    +244,795 shares · 2025Q4
    Position
  7. Bill Nygren (Harris / Oakmark) added2026-02-17
    +4,265,097 shares · 2025Q4
    Position
  8. Ken Griffin (Citadel Advisors) added2026-02-17
    +5,853,277 shares · 2025Q4
    Position
  9. Two Sigma Investments trimmed2026-02-17
    −1,894,276 shares · 2025Q4
    Position
  10. Izzy Englander (Millennium Mgmt) added2026-02-17
    +6,036,983 shares · 2025Q4
    Position
  11. Steve Cohen (Point72) added2026-02-17
    +75,696 shares · 2025Q4
    Position
  12. Dodge & Cox trimmed2026-02-13
    −16,070 shares · 2025Q4
    Position
  13. Ray Dalio (Bridgewater Associates) trimmed2026-02-13
    −203,722 shares · 2025Q4
    Position
  14. Norges Bank (Norway SWF) opened position2026-02-10
    +37,981,502 shares · 2025Q4
    Position
  15. Ken Fisher (Fisher Asset Mgmt) added2026-02-09
    +805,201 shares · 2025Q4
    Position
  16. Bill Smead (Smead Capital) trimmed2026-02-09
    −196,374 shares · 2025Q4
    Position
  17. Mario Gabelli (GAMCO) added2026-02-05
    +1,915 shares · 2025Q4
    Position
  18. AQR Capital Management added2025-11-14
    +1,870,827 shares · 2025Q3
    Position
  19. Izzy Englander (Millennium Mgmt) trimmed2025-11-14
    −226,426 shares · 2025Q3
    Position
  20. Steve Cohen (Point72) added2025-11-14
    +1,256,953 shares · 2025Q3
    Position
  21. Two Sigma Investments trimmed2025-11-14
    −469,247 shares · 2025Q3
    Position
  22. D.E. Shaw & Co. trimmed2025-11-14
    −6,899,937 shares · 2025Q3
    Position
  23. T. Rowe Price added2025-11-14
    +2,803,331 shares · 2025Q3
    Position
  24. Wellington Management trimmed2025-11-14
    −1,577,388 shares · 2025Q3
    Position
  25. Bill Nygren (Harris / Oakmark) added2025-11-14
    +692,290 shares · 2025Q3
    Position
  26. Ray Dalio (Bridgewater Associates) trimmed2025-11-13
    −636,779 shares · 2025Q3
    Position
  27. Jeremy Grantham (GMO) added2025-11-13
    +155,777 shares · 2025Q3
    Position
  28. Renaissance Technologies exited2025-11-13
    −139,820 shares · 2025Q3
    Position
  29. Norges Bank (Norway SWF) exited2025-11-13
    −36,111,289 shares · 2025Q3
    Position
  30. Dodge & Cox trimmed2025-11-13
    −3,025 shares · 2025Q3
    Position

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 each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.
InvestorFirst inCost basisReturnPosition value today
Dodge & Cox2016Q1$53.03+124.5%$16.5M
Mario Gabelli (GAMCO)2016Q1$78.62+51.5%$7.7M
Prem Watsa (Fairfax Financial)2020Q4$80.44+48.0%$20.6M
Ken Fisher (Fisher Asset Mgmt)2016Q1$81.42+46.2%$2.96B
Bill Smead (Smead Capital)2016Q1$83.35+42.9%$338.0M
AQR Capital Management2016Q1$88.05+35.2%$1.34B
Ray Dalio (Bridgewater Associates)2016Q1$88.96+33.8%$36.9M
Ken Griffin (Citadel Advisors)2016Q1$89.65+32.8%$464.4M
Ken Griffin (Citadel Advisors)2016Q1$89.65+32.8%$464.4M
Ken Griffin (Citadel Advisors)2016Q1$89.65+32.8%$464.4M
Jeremy Grantham (GMO)2016Q3$92.37+28.9%$818.0M
Wellington Management2016Q1$92.56+28.6%$10.29B
T. Rowe Price2016Q1$93.44+27.4%$2.23B
Paul Tudor Jones (Tudor Investment)2016Q1$96.83+23.0%$76.5M
Paul Tudor Jones (Tudor Investment)2016Q1$96.83+23.0%$76.5M
Bill Nygren (Harris / Oakmark)2024Q3$100.16+18.9%$1.68B
D.E. Shaw & Co.2016Q1$101.06+17.8%$418.9M
D.E. Shaw & Co.2016Q1$101.06+17.8%$418.9M
D.E. Shaw & Co.2016Q1$101.06+17.8%$418.9M
Izzy Englander (Millennium Mgmt)2016Q1$104.21+14.3%$147.8M
Izzy Englander (Millennium Mgmt)2016Q1$104.21+14.3%$147.8M
Izzy Englander (Millennium Mgmt)2016Q1$104.21+14.3%$147.8M
Steve Cohen (Point72)2016Q3$104.27+14.2%$77.6M
Steve Cohen (Point72)2016Q3$104.27+14.2%$77.6M
Steve Cohen (Point72)2016Q3$104.27+14.2%$77.6M
Two Sigma Investments2016Q1$105.93+12.4%$595K
Two Sigma Investments2016Q1$105.93+12.4%$595K
Two Sigma Investments2016Q1$105.93+12.4%$595K
Norges Bank (Norway SWF)2016Q1$614.42-80.6%$4.52B

Who moved on this name in 2025Q4

Position changes 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
$29.07B
2022Q4
29
$40.96B
2023Q1
29
$39.25B
2023Q2
28
$43.33B
2023Q3
30
$31.43B
2023Q4
27
$33.61B
2024Q1
26
$53.67B
2024Q2
32
$48.80B
2024Q3
30
$21.53B
2024Q4
27
$11.24B
2025Q1
27
$15.82B
2025Q2
27
$16.45B
2025Q3
24
$13.99B
2025Q4
29
$24.66B
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
$24.66B
% 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
4T. Rowe Price18.75M$1.97B
5Bill Nygren
Harris / Oakmark
14.09M$1.48B
6AQR Capital Management11.25M$1.18B
7Jeremy Grantham
GMO
6.87M$723M
8Ken Griffin
Citadel Advisors
6.82M$718M
9Izzy Englander
Millennium Mgmt
6.80M$716M
10Ken Griffin
Citadel Advisors
3.90M$411M
11D.E. Shaw & Co.3.52M$370M
12Ken Griffin
Citadel Advisors
3.38M$356M
13Bill Smead
Smead Capital
2.84M$299M
14Steve Cohen
Point72
1.34M$141M
15Izzy Englander
Millennium Mgmt
1.24M$131M
16D.E. Shaw & Co.723.7K$76M
17D.E. Shaw & Co.689.7K$73M
18Steve Cohen
Point72
652.1K$69M
19Paul Tudor Jones
Tudor Investment
642.2K$68M
20Izzy Englander
Millennium Mgmt
414.9K$44M
21Ray Dalio
Bridgewater Associates
310.2K$33M
22Paul Tudor Jones
Tudor Investment
232.1K$24M
23Prem Watsa
Fairfax Financial
172.9K$18M
24Dodge & Cox138.2K$15M
25Two Sigma Investments74.8K$8M
26Mario Gabelli
GAMCO
65.0K$7M
27Steve Cohen
Point72
61.8K$7M
28Two Sigma Investments13.7K$1M
29Two Sigma Investments5.0K$526K

Recent moves

20 transactions
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