[Form 4] WESCO INTERNATIONAL INC Insider Trading Activity

Rhea-AI Filing Summary

Nagarajan Sundaram, a director of Wesco International, reported two non-cash acquisitions on 09/30/2025. He received 13.3691 dividend equivalent rights (DERs) tied to restricted stock units and 147.754 deferred share units (DSUs) credited under the company’s non-employee director deferred compensation plan.

The DERs were recorded at a $0 transaction price as they represent accrued dividend equivalents on existing RSUs. The DSUs are economic equivalents of common stock and show a price column of $211.5 in the filing; the combined holdings after these entries total 6,393.9882 shares beneficially owned by the reporting person. The Form 4 was signed by an attorney-in-fact on 10/02/2025.

Positive

• Director compensation recorded as non-cash DERs and DSUs, indicating alignment with long-term equity incentives
• Beneficial ownership increased to 6,393.9882 shares following the credited units

Negative

• None.

Insights

Corporate Governance / Insider Reporting Specialist

Director recorded non-cash accruals: 13.3691 DERs and 147.754 DSUs on 09/30/2025.

The filing shows non‑cash awards rather than open‑market trades: DERs are dividend equivalents tied to existing RSUs and vest with those awards, and DSUs were credited under the director deferred compensation plan.

This changes the reporting person’s beneficial ownership to 6,393.9882 shares. The Form 4 was executed by counsel on 10/02/2025, consistent with routine director compensation reporting.

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

OMB APPROVAL

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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^*

NAGARAJAN SUNDARAM

(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)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

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		13.3691(1)	A	$0	6,246.2342	D
Common Stock	09/30/2025		A		147.754(2)	A	$211.5	6,393.9882	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.

2. Represents deferred share units ("DSUs") credited to the Reporting Person's deferred compensation account pursuant to the Issuer's Deferred Compensation Plan for Non-Employee Directors (the "Plan"). Each DSU is the economic equivalent of one share of Issuer's common stock and is eligible for distribution in the form of Issuer's common stock based on the schedule elected by the Reporting Person in accordance with the Plan.

	/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 WESCO director Nagajaran Sundaram report on Form 4 (WCC)?

The Form 4 reports the acquisition on 09/30/2025 of 13.3691 dividend equivalent rights (DERs) and 147.754 deferred share units (DSUs).

Do the reported DERs and DSUs represent cash purchases?

No. The DERs are dividend equivalents on existing RSUs recorded at $0, and the DSUs were credited under the deferred compensation plan as non‑cash awards.

How many shares does the reporting person beneficially own after the transactions?

The filing shows total beneficial ownership of 6,393.9882 shares following the reported transactions.

When was the Form 4 signed and filed?

The signature on the Form 4 was provided by an attorney‑in‑fact, Michele Nelson, on 10/02/2025.

What is the economic nature of DSUs and DERs in this filing?

The filing states each DER and DSU is the economic equivalent of one share of common stock, with DERs vesting with underlying RSUs and DSUs distributed per the elected schedule under the plan.