Data from public SEC 13F & STOCK Act filings, delayed up to ~45 days, partial holdings only — for research, not investment advice.
MRK
MERCK & CO. INC.Data as of 2026 Q1 (03-31) · 13F snapshot
Summary
MERCK & CO. INC. (MRK) is held by 12 tracked hedge-fund managers, a combined reported value of ~$3.25B; the largest are Warren Buffett, Ken Griffin, Ken Griffin. This quarter: 1 added, 3 trimmed, 1 closed. 20 members of Congress have disclosed STOCK Act trades. Data as of 2026 Q1, from public SEC 13F filings, delayed up to ~45 days.
Attention · HighThis quarter · Cooling
Gurus holding12
Congress trades20
Price$119.05vs quarter-end-1.03%
Sectors1
This quarter's moves
Top holderWarren BuffettNew0
Added1
Trimmed / sold4
Value $667.83M— of portfolio5,551,8002026 Q1
Ken GriffinTrim
Value $459.66M0.3% of portfolio3,821,2272026 Q1
Value $450.27M— of portfolio3,743,2002026 Q1
Dan LoebTrim
Value $212.04M3.3% of portfolio2,775,0002018 Q4
Value $187.24M— of portfolio1,556,6002026 Q1
Value $38.28M— of portfolio318,2002026 Q1
George SorosHold
Value $34.07M1.0% of portfolio300,0002024 Q3
Value $19.76M— of portfolio164,3002026 Q1
Value $8.26M— of portfolio68,7002026 Q1
Value $4.38M0.1% of portfolio35,3742024 Q2
| Investor | Value | % of portfolio | Action |
|---|---|---|---|
| Ken GriffinCALL | $667.83M | — | — |
| Ken Griffin | $459.66M | 0.3% | Trim |
| Ken GriffinPUT | $450.27M | — | — |
| Dan Loeb | $212.04M | 3.3% | Trim |
| Izzy EnglanderPUT | $187.24M | — | — |
| Izzy EnglanderCALL | $38.28M | — | — |
| George Soros | $34.07M | 1.0% | Hold |
| Steven CohenCALL | $19.76M | — | — |
| Steven CohenPUT | $8.26M | — | — |
| Greenwoods Asset Management | $4.38M | 0.1% | Hold |