Sec Form 4 Filing - Porwal Hemant @ WESCO INTERNATIONAL INC - 2021-02-22

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL OMB Number: 3235-0287 Expires: November 30, 2011 Estimated average burden hours per response... 0.5

1. Name and Address of Reporting Person Porwal Hemant 2. Issuer Name and Ticker or Trading Symbol WESCO INTERNATIONAL INC [ WCC] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) EVP Supply Chain & Operations (Last) (First) (Middle) 225 W STATION SQUARE DRIVE, SUITE 700 3. Date of Earliest Transaction (MM/DD/YY) 02/22/2021 (Street) PITTSBURGH, PA15219 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price WESCO International Common Stock 02/22/2021 S( 1 ) 3,961 D $ 80.93 ( 2 ) 2,658 D WESCO International Common Stock 02/22/2021 M( 3 ) 3,458 A $ 81.53 6,116 D WESCO International Common Stock 02/22/2021 D 2,983 D $ 80.63 3,133 D WESCO International Common Stock 02/22/2021 F 131 D $ 80.63 3,002 D WESCO International Common Stock 02/22/2021 M( 4 ) 11,684 A $ 81.53 14,686 D WESCO International Common Stock 02/22/2021 D 6,150 D $ 80.63 8,536 D WESCO International Common Stock 02/22/2021 F 1,577 D $ 80.63 6,959 D WESCO International Common Stock 02/23/2021 S( 5 ) 4,301 D $ 79.5 ( 6 ) 2,658 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Stock Appreciation Right $ 80.63 02/22/2021 M 3,458 ( 3 ) 02/17/2025 Common Stock 3,458 $ 0 0 D Stock Appreciation Right $ 80.63 02/22/2021 M 11,684 ( 4 ) 02/16/2026 Common Stock 11,684 $ 0 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Porwal Hemant 225 W STATION SQUARE DRIVE SUITE 700 PITTSBURGH, PA15219 EVP Supply Chain & Operations Signatures /s/ Diane E. Lazzaris, as Attorney-In-Fact 02/24/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The shares being sold were acquired through the vesting of restricted stock units and performance stock units granted to the Reporting Person. The vesting schedules of these units were determined at the time of grant. ( 2 )This is the weighted average for sale prices ranging from $80.92 to $81.04. Upon request of the SEC staff, WESCO International, Inc., or a shareholder of WESCO International, Inc., full information regarding the number of shares sold at each separate price will be provided. ( 3 )The Stock Appreciation Right ("SAR") became exercisable in three (3) equal, annual installments beginning on February 17, 2016. This is an exercise and sell transaction. The SARs have a February 17, 2025 expiration date. ( 4 )The Stock Appreciation Right ("SAR") became exercisable in three (3) equal, annual installments beginning on February 16, 2017. This is an exercise and sell transaction. The SARs have a February 16, 2026 expiration date. ( 5 )The shares being sold were acquired by the Reporting Person through the exercise of Stock Appreciation Rights granted to the Reporting Person in 2015 and 2016. See footnotes 3 and 4 for additional details about these grants. ( 6 )This is the weighted average for sale prices ranging from $79.50 to $79.52. Upon request of the SEC staff, WESCO International, Inc., or a shareholder of WESCO International, Inc., full information regarding the number of shares sold at each separate price will be provided.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.