EXTREME NETWORKS INC

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 14A

(RULE 14a-101)

INFORMATION REQUIRED IN PROXY STATEMENT

SCHEDULE 14A INFORMATION

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:

Extreme Networks, Inc.

(Name of Registrant as Specified in Its Charter)

N/A

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

September 18, 2026

Dear Stockholder:

You are cordially invited to attend the 2026 Annual Meeting of Stockholders of Extreme Networks, Inc. to be held on Wednesday, November 4, 2026, at 11:00 a.m. Eastern Time. This year’s Annual Meeting of Stockholders will be a virtual, live audio meeting of stockholders. We are pleased to continue to conduct the Annual Meeting of Stockholders virtually, as it allows verified stockholders to participate with the same meeting rights and opportunities as an in-person meeting, without the obligation to travel and appear in-person. All references herein to our “Annual Meeting of Stockholders” or “Annual Meeting” refer to our virtual 2026 Annual Meeting of Stockholders.

Details of business to be conducted at the Annual Meeting are described in the Notice of Annual Meeting of Stockholders and Proxy Statement. Accompanying this Proxy Statement is the Company’s 2026 Annual Report to Stockholders.

We are pleased to continue to take advantage of Securities and Exchange Commission rules that allow companies to furnish proxy materials to stockholders over the Internet. We believe these rules allow us to provide our stockholders with the information they need, while lowering the costs of delivery. On or about September 18, 2026, we mailed to our stockholders a Notice of Internet Availability of Proxy Materials (“Notice”) and provided access to our proxy materials over the Internet. The Notice also provides instructions on how to vote online or by telephone and includes instructions on how to receive a paper copy of the proxy materials by mail.

Whether or not you plan to attend our Annual Meeting, you can ensure that your shares are represented at the meeting by promptly voting and submitting your proxy online, by telephone, or, if you have received a paper copy of your proxy materials by mail, by completing, signing, dating, and returning your proxy card in the envelope provided.

If you have any further questions concerning the Annual Meeting or any of the proposals, please contact Stan Kovler, our SVP of Finance & Corporate Development, at (919) 595-4196. We look forward to your attendance at the Annual Meeting.

Sincerely,

Edward B. Meyercord

President and Chief Executive Officer

2026 PROXY STATEMENT

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

To Be Held November 4, 2026

September 18, 2026

Morrisville, North Carolina

TO THE STOCKHOLDERS:

Notice is hereby given that the 2026 Annual Meeting of Stockholders of Extreme Networks, Inc. will be held on Wednesday, November 4, 2026, at 11:00 a.m. Eastern Time. This year’s Annual Meeting of Stockholders will be a virtual, live audio meeting of stockholders. To participate online, you must register before the meeting atwww.proxyvote.com, or during the meeting atwww.virtualshareholdermeeting.com/EXTR2026, with the 16-digit control number printed in the box marked by the arrow on your proxy materials and follow the on-screen instructions. Once registered, you will be able to attend the meeting online where you will be able to listen to the meeting live and vote.

The following proposals will be presented at the meeting, as well as the transaction of such other business as may properly come before the meeting or any adjournments or postponements thereof:

Stockholders of record at the close of business on September 9, 2026, are entitled to notice of, and to vote at, this meeting and any adjournment or postponement thereof. Commencing ten days prior to the meeting, a complete list of stockholders entitled to attend and vote at the meeting will be available for review by any stockholder during normal business hours at our offices located at 2121 RDU Center Drive, Suite 300, Morrisville, North Carolina 27560.

BY ORDER OF THE BOARD OF DIRECTORS,

Katayoun (“Katy”) Motiey

EVP, Chief Legal, Administrative & Sustainability Officer, and Corporate Secretary

YOUR VOTE IS IMPORTANT: Please vote your shares online or by telephone, as described in the accompanying materials, to assure that your shares are represented at the meeting, or, if you received a paper copy of the proxy card by mail, you may mark, sign, and date the proxy card and return it in the enclosed postage-paid envelope. If you attend the meeting, you may choose to vote online at the virtual meeting even if you have previously voted your shares.

IMPORTANT NOTICE REGARDING THE AVAILABILITY OF PROXY MATERIALS: This Proxy Statement and our 2026 Annual Report to Stockholders are available atwww.proxyvote.com.

2026 PROXY STATEMENT

TABLE OF CONTENTS

PROXY STATEMENT