Squires Nelson John III 4

4 · WESCO INTERNATIONAL INC · Filed Aug 15, 2025

Form 4

Period: 2025-08-13

EVP & GM, EES

Transactions

Exercise/Conversion
Stock Appreciation Rights
2025-08-13−12,107→ 0 total
Exercise: $71.65Exp: 2027-02-16→ Common Stock (12,107 underlying)
Tax Payment
Common Stock
2025-08-13$215.42/sh−5,024$1,082,270→ 59,717.864 total
Sale
Common Stock
2025-08-14$210.29/sh−5,493$1,155,123→ 54,224.864 total
Disposition to Issuer
Common Stock
2025-08-13$215.42/sh−4,027$867,496→ 56,704.864 total
Exercise/Conversion
Common Stock
2025-08-13$62.80/sh+16,305$1,023,954→ 69,495.864 total
Sale
Common Stock
2025-08-14$211.52/sh−5,600$1,184,512→ 48,624.864 total
Exercise/Conversion
Common Stock
2025-08-13$71.65/sh+12,107$867,467→ 60,731.864 total
Tax Payment
Common Stock
2025-08-13$215.42/sh−3,514$756,986→ 53,190.864 total
Disposition to Issuer
Common Stock
2025-08-13$215.42/sh−4,754$1,024,107→ 64,741.864 total
Exercise/Conversion
Stock Appreciation Rights
2025-08-13−16,305→ 0 total
Exercise: $62.80Exp: 2028-02-13→ Common Stock (16,305 underlying)

Footnotes (4)

[F1]Represents weighted average sale price. These shares were sold in multiple transactions at prices ranging from $209.35 to $210.29. Upon request by the SEC, the Issuer or a stockholder of the Issuer, complete information regarding the number of shares sold at each price within the range will be provided.
[F2]Represents weighted average sale price. These shares were sold in multiple transactions at prices ranging from $210.54 to $211.52. Upon request by the SEC, the Issuer or a stockholder of the Issuer, complete information regarding the number of shares sold at each price within the range will be provided.
[F3]The Stock Appreciation Rights became exercisable in three (3) equal, annual installments beginning on the first anniversary of the February 16, 2017 grant date.
[F4]The Stock Appreciation Rights became exercisable in three (3) equal, annual installments beginning on the first anniversary of the February 13, 2018 grant date.

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