v3.26.1
Interest in Master Trust (Tables)
 12 Months Ended
Dec. 31, 2025
EBP 003  
EBP, Master Trust [Line Items]  
Schedule of Master Trust Net Assets
The following tables summarize the assets and liabilities of the commingled funds held in the Master Trust and the Plan's interest in those assets and liabilities at December 31, 2025 and 2024:
December 31, 2025
Master Trust - Commingled FundsPlan's Interest in Master Trust Commingled Funds
Marsh Stock Fund
Marsh common stock at fair value$569,666,803 $521,848,602 
Short-term investment fund at fair value10,613,206 9,722,327 
Accrued interest receivable36,384 33,330 
Liability for expenses incurred(21,253)(19,469)
580,295,140 531,584,790 
Stable Value Fund
Security backed investment contracts at contract value512,986,091 456,475,130 
Short-term investment fund at fair value23,594,468 20,995,284 
Accrued interest receivable85,026 75,659 
Liability for expenses incurred(119,202)(106,070)
536,546,383 477,440,003 
Common collective trusts at fair value3,330,896,704 2,774,924,801 
Net assets of commingled investments held by Master Trust$4,447,738,227 $3,783,949,594 
December 31, 2024
Master Trust - Commingled FundsPlan's Interest in Master Trust Commingled Funds
Marsh Stock Fund
Marsh common stock at fair value$722,475,231 $660,838,115 
Short-term investment fund at fair value15,128,903 13,838,199 
Accrued interest receivable55,559 50,819 
Liability for expenses incurred (21,250)(19,437)
737,638,443 674,707,696 
Stable Value Fund
Security backed investment contracts at contract value517,049,326 466,095,480 
Short-term investment fund at fair value11,086,840 9,994,261 
Accrued interest receivable43,260 38,997 
Liability for expenses incurred(118,452)(106,779)
528,060,974 476,021,959 
Common collective trusts at fair value2,784,329,533 2,389,489,742 
Net assets of commingled investments held by Master Trust$4,050,028,950 $3,540,219,397 
The following table summarizes the net investment income of the commingled investments held in the Master Trust for the year ended December 31, 2025:
Investment income and expenses:
Net depreciation in fair value of Marsh common stock
$(82,925,232)
Net appreciation in fair value of common collective trusts
521,402,298 
Dividends
11,144,144 
Interest
16,703,838 
Expenses
(771,552)
Net investment income
$465,553,496 
Net investment income from commingled investments in Master Trust – By plan:
Marsh & McLennan Companies 401(k) Savings & Investment Plan
$386,029,994 
MMA Plan
$79,523,502