W.W. GRAINGER, INC.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A​

Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934 (Amendment No. )

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

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Preliminary Proxy Statement

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Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

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Definitive Proxy Statement

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Definitive Additional Materials

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Soliciting Material Pursuant to §240.14a-12

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W.W. Grainger, Inc.

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(Name of registrant as specified in its charter)

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(Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)

Payment of Filing Fee (Check the appropriate box):

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No fee required.

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Fee paid previously with preliminary materials.

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Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

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A Message from Our Chairman of the Board and

Chief Executive Officer

March 10, 2026

Dear Grainger Shareholders:

We are pleased to invite you to attend the 2026 annual meeting of shareholders of W.W. Grainger, Inc. on Wednesday, April 29, 2026, at 8:00 a.m. Central Time. This year’s annual meeting will be held virtually with no in-person attendance.

The meeting will include a report on our operations and other matters of current interest. Shareholders will also vote on the matters described in the accompanying Notice of 2026 Annual Meeting of Shareholders and Proxy Statement, and any other matters, properly brought before the meeting.

To provide shareholders with the information they need efficiently, while at the same time conserving natural resources and lowering the cost of delivery, we have elected to deliver our proxy materials electronically. On the following pages in the Notice of 2026 Annual Meeting of Shareholders and Proxy Statement, you will find instructions on how to:

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vote by internet, by telephone or by mail; and

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receive a paper copy of the proxy materials by mail.

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We hope you will take the time to carefully read the Notice of 2026 Annual Meeting of Shareholders and Proxy Statement. Regardless of whether you plan to attend the meeting, please ensure that your shares are represented by giving us your proxy. You can do so by telephone, by internet, or, for those electing to receive a paper copy, by signing and dating the proxy form and returning it promptly in the envelope provided.

We look forward to your participation.

Sincerely,

D.G. Macpherson​

Chairman of the Board and Chief Executive Officer

100 Grainger Parkway

Lake Forest, Illinois

60045-5201

(847) 535-1000

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Notice of 2026 Annual Meeting of Shareholders

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For additional information about our 2026 annual meeting of shareholders (the “2026 Annual Meeting”), see Questions and Answers beginning on page 78.

We will also consider any other matters that may properly be brought before the 2026 Annual Meeting (and any postponements or adjournments of the meeting).

Virtual Meeting

We will hold the 2026 Annual Meeting virtually. We believe hosting a virtual annual meeting enables shareholders to attend and participate fully and equally, improves meeting efficiency and our ability to effectively communicate and engage with shareholders regardless of their holdings, resources or physical location and provides cost savings to W.W. Grainger, Inc. (the “Company”). To virtually attend the 2026 Annual Meeting, visitwww.virtualshareholdermeeting.com/GWW2026 (the “Annual Meeting Website”) and enter the 16-digit control number found on your proxy card or voting instruction form (“Control Number”). You may vote your shares and submit your questions prior to the 2026 Annual Meeting. We will answer questions germane to the Company at the 2026 Annual Meeting.

Proxy Materials

This 2026 Notice of Annual Meeting of Shareholders, the following proxy statement and the accompanying proxy card were first distributed or made available to shareholders on or about March 10, 2026.

By order of the Board of Directors,

Paul J. Stanukinas

Vice President, Corporate Secretary

Admission

Shareholders of W.W. Grainger, Inc. (“Grainger” or the “Company”), as of March 2, 2026 (the “Record Date”), may attend the 2026 Annual Meeting virtually, via webcast format, on April 29, 2026 at 8:00 a.m., Central Time.

Voting

Regardless of whether you plan to attend the 2026 Annual Meeting, we hope you will vote as soon as possible. You may vote your shares prior to the 2026 Annual Meeting electronically or by telephone. If you received a paper copy of a proxy or a voting instruction card by mail, you may submit your proxy or voting instruction card before the 2026 Annual Meeting by completing, signing, dating and returning your proxy or voting instruction card in the pre-addressed envelope provided. For specific instructions on voting, see Questions and Answers—Voting Information beginning on page 79.

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Or until 10:59 p.m. CT on April 26, 2026, if your shares are held in the W.W. Grainger, Inc. Retirement Savings Plan (the “Retirement Savings Plan”), the W.W. Grainger, Inc. 401(k) Plan or the Company’s Employee Stock Purchase Plan.

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Electronic Delivery of Proxy Materials

We encourage all shareholders to voluntarily elect to receive all proxy materials electronically. This helps reduce the paper materials mailed to you and supports our goal of minimizing our environmental footprint.

Important Notice Regarding the Availability of Proxy Materials for the 2026 Annual Meeting of Shareholders to be Held Virtually on April 29, 2026.

This Notice of 2026 Annual Meeting of Shareholders, the following proxy statement, the accompanying proxy card and our 2025 Annual Report on Form 10-K are available under “Financials” in the Investor Relations section of our website athttps://invest.grainger.com and also may be obtained free of charge on written request to the Office of the Corporate Secretary at Grainger’s headquarters, at 100 Grainger Parkway, Lake Forest, Illinois 60045-5201.