[Form 4] WESCO INTERNATIONAL INC Insider Trading Activity

Rhea-AI Filing Summary

Daniel J. Castillo, EVP & GM, EES of WESCO INTERNATIONAL INC (WCC), reported a Section 16 Form 4 disclosing receipt of 26.2703 dividend equivalent rights (DERs) on 09/30/2025. The DERs were credited in connection with restricted stock units and carry the economic equivalent of one share each, vesting on the same schedule as the underlying RSUs. The filing shows the DERs were recorded at a price of $0 and that the Reporting Person’s total beneficial ownership following the transaction is 12,271.2703 shares. The Form 4 was signed by an attorney-in-fact on 10/02/2025.

Positive

• 26.2703 dividend equivalent rights (DERs) credited to the reporting person on 09/30/2025
• Total beneficial ownership increased to 12,271.2703 shares following the transaction

Negative

• None.

Insights

Corporate Insider Reporting Specialist

Routine award-related crediting of DERs increased insider holdings slightly

The filing documents that 26.2703 dividend equivalent rights were credited to Daniel J. Castillo on 09/30/2025 tied to his restricted stock units. Each DER equals one share economically and vests with the underlying RSUs, indicating these are non-cash, compensation-related accruals rather than open-market purchases.

This matters because the reported change increases Castillo’s beneficial ownership to 12,271.2703 shares and is a recorded insider event that must be disclosed under Section 16; the filing lists a transaction price of $0, consistent with credited award treatment.

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).

1. Name and Address of Reporting Person^*

Castillo Daniel J

(Last) (First) (Middle)

225 WEST STATION SQUARE DRIVE

SUITE 700

(Street)

PITTSBURGH PA 15219-1122

(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 & GM, EES

3. Date of Earliest Transaction (Month/Day/Year)
09/30/2025

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	09/30/2025		A		26.2703(1)	A	$0	12,271.2703	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

Explanation of Responses:

1. Represents dividend equivalent rights ("DERs") in connection with the Issuer's quarterly dividend and accrued to the Reporting Person on restricted stock units ("RSUs") held by the Reporting Person. Each DER is the economic equivalent of one share of Issuer's common stock and vests on the same schedule as the underlying award.

	/s/ Michele Nelson, as Attorney-in-Fact	10/02/2025
	** Signature of Reporting Person	Date
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.

FAQ

What did Daniel J. Castillo report on the Form 4 for WCC?

The Form 4 reports that Daniel J. Castillo received 26.2703 dividend equivalent rights (DERs) credited on 09/30/2025, increasing his holdings to 12,271.2703 shares.

What are the dividend equivalent rights (DERs) reported on WESCO's Form 4?

The filing states each DER is the economic equivalent of one share of common stock and vests on the same schedule as the underlying restricted stock units (RSUs).

Was there any cash paid for the reported transaction on the Form 4?

No cash was paid; the transaction is recorded with a price of $0, consistent with award-related crediting.

When was the Form 4 signature dated for the WCC filing?

The Form 4 was signed by an attorney-in-fact on 10/02/2025.

What is Daniel Castillo's role at WESCO as listed on the Form 4?

The filing lists Daniel J. Castillo as an Officer with the title EVP & GM, EES.