Diane Lazzaris - Jul 2, 2021 Form 4 Insider Report for WESCO INTERNATIONAL INC (WCC)

Role: EVP and General Counsel
Signature: /s/ Diane E. Lazzaris
Stock symbol: WCC
Transactions as of: Jul 2, 2021
Transactions value $: -$420,562
Form type: 4
Date filed: 7/7/2021, 05:04 PM
Previous filing: May 17, 2021
Next filing: Aug 27, 2021

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	WCC	Common Stock	Options Exercise	$0	+9.32K	+48.41%	$0.00	28.6K	Jul 2, 2021	Direct	F1
transaction	WCC	Common Stock	Tax liability	-$421K	-4.05K	-14.18%	$103.74	24.5K	Jul 2, 2021	Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	WCC	Restricted Stock Units	Options Exercise	$0	-9.32K	-30%	$0.00	21.8K	Jul 2, 2021	Common Stock	9.32K		Direct	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Each restricted stock unit ("RSU") represents a contingent right to acquire one share of Issuer's common stock.
F2	On July 2, 2020, the Reporting Person was granted 31,075 RSUs that vest as follows: 30% on each of the first and second anniversaries of the grant date and 40% on the third anniversary of the grant date.