[Form 4] WESCO INTERNATIONAL INC Insider Trading Activity

Rhea-AI Filing Summary

WESCO International executive Diane Lazzaris reported a series of insider transactions involving company common stock. In mid-February 2026, she exercised stock options and stock appreciation rights and then carried out open-market sales and share dispositions related to option exercises and taxes.

Overall, she sold 20,041 shares of WESCO common stock through multiple open-market transactions at prices around $300 per share, while also surrendering shares to cover taxes and exercise costs. After these moves, she reported direct ownership of 29,597.8255 WESCO common shares.

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Lazzaris Diane

(Last) (First) (Middle)

225 WEST STATION SQUARE DRIVE

SUITE 700

(Street)

PITTSBURGH PA 15219

(City) (State) (Zip)

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 and General Counsel

3. Date of Earliest Transaction (Month/Day/Year)
02/16/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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
Common Stock	02/16/2026		F		235.8715(1)	D	$307.1	45,171.8255	D
Common Stock	02/17/2026		S		8,655	D	$304.64(2)	36,516.8255	D
Common Stock	02/17/2026		S		6,737	D	$305.51(3)	29,779.8255	D
Common Stock	02/17/2026		S		645	D	$306.23(4)	29,134.8255	D
Common Stock	02/17/2026		M		6,051	A	$76.8	35,185.8255	D
Common Stock	02/17/2026		D		1,544	D	$300.92	33,640.8255	D
Common Stock	02/17/2026		F		1,960	D	$300.92	31,680.8255	D
Common Stock	02/17/2026		M		3,324	A	$171.96	32,458.8255	D
Common Stock	02/17/2026		M		1,329	A	$152.07	33,787.8255	D
Common Stock	02/17/2026		F		3,466	D	$303.64	30,321.8255	D
Common Stock	02/17/2026		S		1,001	D	$304.22(5)	29,320.8255	D
Common Stock	02/17/2026		S		185	D	$304.82(6)	29,135.8255	D
Common Stock	02/17/2026		S		71	D	$300.07(7)	29,064.8255	D
Common Stock	02/18/2026		S		1,623	D	$301.5(8)	29,988.8255	D
Common Stock	02/18/2026		S		391	D	$302.18(9)	29,597.8255	D
Common Stock	02/18/2026		S		733	D	$305.28(10)	28,864.8255	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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (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: 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 Rights	$76.8	02/17/2026		M			6,051	(11)	02/11/2031	Common Stock	6,051	$0	0	D
Stock Options (Right to Buy)	$171.96	02/17/2026		M			3,324	(12)	02/16/2033	Common Stock	3,324	$0	0	D
Stock Options (Right to Buy)	$152.07	02/17/2026		M			1,329	(13)	03/01/2034	Common Stock	1,329	$0	2,661	D

Explanation of Responses:

1. Represents tax withholding on the vesting of RSUs that were granted February 16, 2023.

2. Represents weighted average sale price. These shares were sold in multiple transactions at prices ranging from $304.14 - $305.13. 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.

3. Represents weighted average sale price. These shares were sold in multiple transactions at prices ranging from $305.15 - $306.12. 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.

4. Represents weighted average sale price. These shares were sold in multiple transactions at prices ranging from $306.15 - $306.45. 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.

5. Represents weighted average sale price. These shares were sold in multiple transactions at prices ranging from $303.82 - $304.77. 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.

6. Represents weighted average sale price. These shares were sold in multiple transactions at prices ranging from $304.82 - $304.83. 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.

7. Represents weighted average sale price. These shares were sold in multiple transactions at prices ranging from $299.87 - $300.14. 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.

8. Represents weighted average sale price. These shares were sold in multiple transactions at prices ranging from $301.03 - $302.00. 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.

9. Represents weighted average sale price. These shares were sold in multiple transactions at prices ranging from $302.10 - $302.65. 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.

10. Represents weighted average sale price. These shares were sold in multiple transactions at prices ranging from $305.16 - $305.60. 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.

11. The stock appreciation rights became exercisable in three equal annual installments beginning on the first anniversary of the February 11, 2021 grant date.

12. The stock options became exercisable in three equal annual installments beginning on the first anniversary of the February 16, 2023 grant date.

13. The stock options became exercisable in three equal annual installments beginning on the first anniversary of the March 1, 2024 grant date.

	/s/ Michele Nelson, as Attorney-in-Fact	02/18/2026
	** Signature of Reporting Person	Date
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