WESCO (WCC) EVP Daniel Castillo receives RSU and stock option grants

Rhea-AI Filing Summary

Castillo Daniel J reported acquisition or exercise transactions in this Form 4 filing.

WESCO International executive Daniel J. Castillo received new equity awards. On March 2, 2026, he was granted stock options for 3,827 shares at a price of $0.00 per share, which become exercisable in three equal annual installments beginning on the first anniversary of the grant date.

On the same date, he also received a grant of 1,606 restricted stock units (RSUs), each representing a contingent right to one share of common stock. These RSUs vest in three equal installments beginning on the first anniversary of the grant date, increasing his directly owned common stock to 13,900.03 shares.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Castillo Daniel J

Role EVP & GM, EES

Type	Security	Shares	Price	Value
Grant/Award	Stock Options (Right to Buy)	3,827	$0.00	--
Grant/Award	Common Stock	1,606	$0.00	--

Holdings After Transaction: Stock Options (Right to Buy) — 3,827 shares (Direct); Common Stock — 13,900.03 shares (Direct)

Footnotes (1)

1. Represents a grant of RSUs. Each RSU represents a contingent right to acquire one share of Issuer's common stock. The RSUs vest in three equal installments beginning on the first anniversary of the date of grant. The stock options become exercisable in three equal annual installments beginning on the first anniversary of the date of grant.

Form 4 Insider Transactions: What Each Field Means →

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

OMB Number:			3235-0287
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hours per response:			0.5

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^*

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)
03/02/2026

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	03/02/2026		A		1,606(1)	A	$0	13,900.03	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 Options (Right to Buy)	$295.84	03/02/2026		A		3,827		(2)	03/02/2036	Common Stock	3,827	$0	3,827	D

Explanation of Responses:

1. Represents a grant of RSUs. Each RSU represents a contingent right to acquire one share of Issuer's common stock. The RSUs vest in three equal installments beginning on the first anniversary of the date of grant.

2. The stock options become exercisable in three equal annual installments beginning on the first anniversary of the date of grant.

	/s/ Michele Nelson, as Attorney-in-Fact	03/03/2026
	** 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 insider transactions did WESCO (WCC) executive Daniel J. Castillo report?

Daniel J. Castillo reported equity award acquisitions, not open-market trades. He received 3,827 stock options and 1,606 RSUs on March 2, 2026, both granted at $0.00 per share as part of his executive compensation package.

How many RSUs were granted to WESCO (WCC) executive Daniel J. Castillo?

Daniel J. Castillo was granted 1,606 restricted stock units (RSUs). Each RSU represents a contingent right to receive one share of WESCO common stock, vesting in three equal installments beginning on the first anniversary of the March 2, 2026 grant date.

What stock options did WESCO (WCC) grant to Daniel J. Castillo?

WESCO granted Daniel J. Castillo 3,827 stock options with a stated price of $0.00 per share. These options become exercisable in three equal annual installments starting on the first anniversary of the March 2, 2026 grant date, reflecting a time-based vesting schedule.

How did the March 2, 2026 grants affect Daniel J. Castillo’s WESCO (WCC) share holdings?

Following the common stock grant, Daniel J. Castillo directly owned 13,900.03 shares of WESCO common stock. This total reflects the addition of 1,606 awarded shares on March 2, 2026, as reported in the Form 4 insider filing.

What roles does Daniel J. Castillo hold at WESCO (WCC) related to this Form 4 filing?

Daniel J. Castillo is reported as an officer of WESCO, serving as EVP & GM, EES. The Form 4 reflects equity awards he received in that capacity, including stock options and restricted stock units granted on March 2, 2026.

How do the RSUs granted to WESCO (WCC) executive Daniel J. Castillo vest?

The 1,606 RSUs granted to Daniel J. Castillo vest in three equal installments. Vesting begins on the first anniversary of the March 2, 2026 grant date, with each installment delivering shares of WESCO common stock upon satisfaction of the time-based vesting conditions.