WESCO exec has 1,618 shares withheld for taxes

EVP & GM, EES Daniel J. Castillo reported a tax-withholding share disposition tied to RSU vesting, with direct holdings remaining after the event.

Rhea-AI Filing Summary

WESCO INTERNATIONAL INC (WCC) reported that executive officer Daniel J. Castillo, EVP & GM, EES, had 1,618.0105 shares of common stock withheld on September 11, 2026 to satisfy tax liabilities upon the vesting of previously granted restricted stock units. The shares were disposed of at a price of $356.32 per share for tax-withholding purposes, and Castillo now directly holds 14,687.305 shares of WESCO common stock. The RSUs that vested were originally granted on September 11, 2025, and no Rule 10b5-1 trading plan is reported for this transaction.

Insider Trade Summary

Tax Withholding: 1,618.0105 shares

Tax Withholding 1 txn

Insider Castillo Daniel J

Role EVP & GM, EES

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	1,618.0105	$356.32	$577K

Holdings After Transaction: Common Stock — 14,687.305 shares (Direct)

Footnotes (1)

1. F1. Represents tax withholding on the vesting of restricted stock units ("RSUs") that were granted on 09/11/2025.

Key Figures

Shares disposed for tax withholding: 1,618.0105 shares Transaction price per share: $356.32 per share Shares held after transaction: 14,687.305 shares +2 more

5 metrics

Shares disposed for tax withholding 1,618.0105 shares Common stock withheld on September 11, 2026 to pay tax liability on RSU vesting

Transaction price per share $356.32 per share Valuation used for the tax-withholding disposition on September 11, 2026

Shares held after transaction 14,687.305 shares Direct holdings of WESCO common stock by Daniel J. Castillo following the event

RSU grant date September 11, 2025 Date the restricted stock units that vested were originally granted

Transaction type code Code F Payment of tax liability by delivering or withholding securities

Key Terms

restricted stock units ("RSUs"), tax withholding, vesting, Payment of tax liability by delivering or withholding securities

4 terms

restricted stock units ("RSUs") financial

"Represents tax withholding on the vesting of restricted stock units ("RSUs")"

Restricted stock units (RSUs) are a company promise to give an employee shares of stock (or cash equivalent) in the future, but only after certain conditions—usually staying with the company for a set time or hitting performance goals—are met. Investors watch RSUs because when they vest they increase the number of shares outstanding and can lead insiders to sell shares, affecting share price, company dilution and the true cost of employee pay.

tax withholding financial

"Represents tax withholding on the vesting of restricted stock units"

Tax withholding is the practice of taking a portion of a payment—such as wages, dividends, or sale proceeds—before it reaches the recipient and sending that portion to the tax authority as an advance on the recipient’s eventual tax bill. For investors it matters because withholding reduces immediate cash received and affects after‑tax returns, estimated tax payments, and whether you may owe more or receive a refund when taxes are finally calculated, like having a small automatic savings set aside for your tax bill.

vesting financial

"tax withholding on the vesting of restricted stock units ("RSUs")"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

Payment of tax liability by delivering or withholding securities financial

"transaction code description indicates Payment of tax liability by delivering"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did WESCO INTERNATIONAL INC (WCC) report for Daniel J. Castillo?

The company reported that 1,618.0105 shares of WESCO common stock were withheld on September 11, 2026 to cover tax liabilities arising from the vesting of restricted stock units granted on September 11, 2025.

Was the WCC insider transaction by Daniel J. Castillo an open-market sale?

No. The filing describes the event as payment of tax liability by delivering or withholding securities upon RSU vesting, rather than an open-market purchase or sale, and it is coded as a tax-withholding disposition.

How many WCC shares does Daniel J. Castillo hold after this Form 4 transaction?

After the tax-withholding transaction, Daniel J. Castillo directly holds 14,687.305 shares of WESCO INTERNATIONAL INC common stock, as reported in the filing’s post-transaction holdings figure.

What was the price used for the WCC tax-withholding shares on September 11, 2026?

The 1,618.0105 shares withheld for taxes were valued at $356.32 per share for the transaction, according to the Form 4 data for WESCO INTERNATIONAL INC.

Were Daniel J. Castillo’s WCC transactions under a Rule 10b5-1 trading plan?

No. The filing’s Rule 10b5-1 checkbox is not marked as being under a plan, and the footnote describes the event solely as tax withholding on the vesting of RSUs granted on September 11, 2025.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/15/2026 - 05:31 PM Accepted by SEC EDGAR 09/15/2026 - 05:31 PM Learn about SEC filing dates

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
Estimated average burden
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 PENNSYLVANIA 15219-1122

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/11/2026

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

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

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

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	09/11/2026		F		1,618.0105(1)	D	$356.32	14,687.305	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 tax withholding on the vesting of restricted stock units ("RSUs") that were granted on 09/11/2025.

	/s/ Michele Nelson, as Attorney-in-Fact	09/15/2026
	** 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.
* Form 4: SEC 1474 (03-26)