v3.26.1
Master Trust (Tables)
 12 Months Ended
Dec. 31, 2025
EBP 001  
EBP, Master Trust [Line Items]  
Schedule of master trust net assets
The net assets of the Master Trust and the Plan's interest are as follows:
2025
(in thousands)Master TrustMerck US Savings Plan Interest
Registered investment companies (mutual funds)$97,747 $91,946 
Common/collective trusts12,677,091 12,108,089 
Equity securities2,307,397 2,189,256 
Fixed income securities406,994 386,758 
Self-directed brokerage accounts459,800 435,989 
Merck common stock907,977 812,041 
Accrued interest and dividends15,877 14,659 
Other net assets8,648 8,233 
$16,881,531 $16,046,971 
2024
(in thousands)Master TrustMerck US Savings Plan Interest
Registered investment companies (mutual funds)$500,106 $474,904 
Common/collective trusts11,107,463 10,620,120 
Equity securities2,244,340 2,130,066 
Fixed income securities386,182 367,820 
Self-directed brokerage accounts368,784 352,416 
Merck common stock1,026,831 926,902 
Accrued interest and dividends17,180 15,934 
Other net assets4,994 4,747 
$15,655,880$14,892,909
Total investment income (loss) of the Master Trust for the year ended December 31, 2025, is as follows:
2025
Master Trust
(in thousands)
Investment income
    Net appreciation$2,354,281 
    Interest and dividends157,490 
        Total investment income$2,511,771