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:

(Name of Registrant as Specified in Its Charter)

N/A

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

September 26, 2025

Dear Stockholder:

You are cordially invited to attend the 2025 Annual Meeting of Stockholders of Extreme Networks, Inc. to be held on Wednesday, November 12, 2025 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 validated 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” refers to our virtual 2025 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 2025 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 26, 2025, you were provided with 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.

Yours Truly,

Edward B. Meyercord

President and Chief Executive Officer

YOUR VOTE IS VERY IMPORTANT. Whether or not you plan to attend the Annual Meeting of Stockholders, we urge you to vote and submit your proxy online, by telephone, or by mail to ensure the presence of a quorum. If you attend the meeting and do not hold your shares through an account with a brokerage firm, bank or other nominee, you will have the right to revoke the proxy and vote your shares in person. If you hold your shares through an account with a brokerage firm, bank or other nominee, please follow the instructions you receive from them to vote your shares and revoke your vote, if necessary.

2025 PROXY STATEMENT

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

To Be Held November 12, 2025

TO THE STOCKHOLDERS:

Notice is hereby given that the 2025 Annual Meeting of Stockholders of Extreme Networks, Inc. will be held on Wednesday, November 12, 2025 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/EXTR2025, with the 16-digit code 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 17, 2025 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

Morrisville, North Carolina

September 26, 2025

2025 PROXY STATEMENT

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 FOR THE ANNUAL MEETING OF STOCKHOLDERS TO BE HELD ON NOVEMBER 12, 2025: This Proxy Statement and the financial and other information concerning Extreme Networks contained in our Annual Report to Stockholders for the fiscal year ended June 30, 2025 are available on the Internet and may be viewed atwww.proxyvote.com, where you may also cast your vote.

2025 PROXY STATEMENT

TABLE OF CONTENTS

PROXY STATEMENT