v3.26.1
Employee Benefit Plan, Fair Value and NAV - WESCO DISTRIBUTION, INC. RETIREMENT SAVINGS PLAN
 12 Months Ended
Dec. 31, 2025
EBP, Investment, Fair Value and NAV [Line Items]  
EBP, Investment, Fair Value and NAV Investments
The Plan's investments measured at fair value on a recurring basis within the fair value hierarchy level, as described in Note 2, "Summary of Significant Accounting Policies", were as follows:
December 31, 2025
Level 1Level 2Level 3Total
Shares of registered investment companies$238,982,904 $— $— $238,982,904 
Self-directed accounts51,179,570 — — 51,179,570 
Money market funds33,848,462 — — 33,848,462 
Wesco Stock Fund14,278,347 — — 14,278,347 
Total assets in the fair value hierarchy338,289,283 — — 338,289,283 
Investments measured at NAV per share practical expedient(1)
— — — 1,766,044,938 
Investments at fair value $338,289,283 $— $— $2,104,334,221 
December 31, 2024
Level 1Level 2Level 3Total
Shares of registered investment companies$198,696,818 $— $— $198,696,818 
Self-directed accounts35,737,562 — — 35,737,562 
Money market funds33,756,683 — — 33,756,683 
Wesco Stock Fund11,417,041 — — 11,417,041 
Total assets in the fair value hierarchy279,608,104 — — 279,608,104 
Investments measured at NAV per share practical expedient(1)
— — — 1,517,340,783 
Investments at fair value$279,608,104 $— $— $1,796,948,887 
(1)     These investments are comprised of various collective investment trust funds, which are measured at fair value using the NAV per share as a practical expedient, and therefore have not been classified in the fair value hierarchy as of December 31, 2025 and 2024. These funds include the Loomis Sayles Large Cap Growth Trust Class C fund, various Capital Group target date retirement funds, the Spartan 500 Index Pool Class C fund, the Spartan Mid Cap Index Pool Class C fund, the Spartan Small Cap Index Pool Class C fund, and the Spartan Total International Index Pool Class C fund. The fair value of these funds is presented in the table above to permit reconciliation of the fair value hierarchy to the Statements of Net Assets Available for Benefits.
EBP, Investment, Fair Value and NAV Investments
The Plan's investments measured at fair value on a recurring basis within the fair value hierarchy level, as described in Note 2, "Summary of Significant Accounting Policies", were as follows:
December 31, 2025
Level 1Level 2Level 3Total
Shares of registered investment companies$238,982,904 $— $— $238,982,904 
Self-directed accounts51,179,570 — — 51,179,570 
Money market funds33,848,462 — — 33,848,462 
Wesco Stock Fund14,278,347 — — 14,278,347 
Total assets in the fair value hierarchy338,289,283 — — 338,289,283 
Investments measured at NAV per share practical expedient(1)
— — — 1,766,044,938 
Investments at fair value $338,289,283 $— $— $2,104,334,221 
December 31, 2024
Level 1Level 2Level 3Total
Shares of registered investment companies$198,696,818 $— $— $198,696,818 
Self-directed accounts35,737,562 — — 35,737,562 
Money market funds33,756,683 — — 33,756,683 
Wesco Stock Fund11,417,041 — — 11,417,041 
Total assets in the fair value hierarchy279,608,104 — — 279,608,104 
Investments measured at NAV per share practical expedient(1)
— — — 1,517,340,783 
Investments at fair value$279,608,104 $— $— $1,796,948,887 
(1)     These investments are comprised of various collective investment trust funds, which are measured at fair value using the NAV per share as a practical expedient, and therefore have not been classified in the fair value hierarchy as of December 31, 2025 and 2024. These funds include the Loomis Sayles Large Cap Growth Trust Class C fund, various Capital Group target date retirement funds, the Spartan 500 Index Pool Class C fund, the Spartan Mid Cap Index Pool Class C fund, the Spartan Small Cap Index Pool Class C fund, and the Spartan Total International Index Pool Class C fund. The fair value of these funds is presented in the table above to permit reconciliation of the fair value hierarchy to the Statements of Net Assets Available for Benefits.