Immix Biopharma, 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:

IMMIX BIOPHARMA, INC.

(Name of Registrant as Specified In Its Charter)

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

Payment of Filing Fee (Check all boxes that apply):

IMMIX BIOPHARMA, INC.

11400 West Olympic Blvd., Suite 200

Los Angeles, CA 90064

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

To Be Held on May 22, 2026

Dear Stockholders:

You are cordially invited to attend the 2026 Annual Meeting of Stockholders (the “Annual Meeting”) of Immix Biopharma, Inc. (the “Company,” “we,” “us”, or “our”) to consider and act upon the following matters:

The Company’s Board of Directors has fixed the close of business on March 31, 2026 as the record date (the “Record Date”) for the determination of stockholders entitled to notice of, and to vote at, the Annual Meeting and any adjournments or postponements thereof.

The Notice of Internet Availability of Proxy Materials will be mailed to our stockholders on or about April 6, 2026. If you previously requested electronic or paper delivery of the proxy materials, you will be sent the proxy statement, the accompanying proxy card and our 2025 Annual Report to Stockholders on or about April 10, 2026. The Notice of Internet Availability of Proxy Materials contains instructions on how to access an electronic copy of our proxy materials.

If You Plan to Attend the Annual Meeting

Please note that space limitations make it necessary to limit attendance at the Annual Meeting to our stockholders. Registration and seating will begin at 11:30 a.m. ET (8:30 a.m. PT). Shares of common stock can be voted at the Annual Meeting only if the holder thereof is present in person or represented by a valid proxy.

For admission to the Annual Meeting, each stockholder may be asked to present valid picture identification, such as a driver’s license or passport, and proof of stock ownership as of the Record Date, such as the enclosed proxy card or a brokerage statement reflecting stock ownership. Cameras, recording devices and other electronic devices will not be permitted at the Annual Meeting. If you do not plan on attending the Annual Meeting, please vote, electronically over the Internet or, if you receive a paper copy of the proxy card or voting instruction form by mail, by dating, signing and returning the proxy card or voting instruction form in the business envelope provided. Even if you do plan to attend the Annual Meeting, we recommend that you vote your shares promptly in order to ensure your representation at the Annual Meeting. Your vote is very important.

Important Notice Regarding the Availability of Proxy Materials for the Annual Meeting to Be Held on May 22, 2026 at 12:00 p.m. ET (9:00 a.m. PT) at the Company’s principal office located at 11400 West Olympic Blvd., Suite 200, Los Angeles, CA 90064.

**The Company’s proxy statement and 2025 Annual Report to Stockholders are available at

http://www.annualgeneralmeetings.com/immx2026

By the Order of the Board of Directors

/s/ Ilya Rachman

Ilya Rachman

Chairman of the Board of Directors, Chief Executive Officer and Chief Scientific Officer

Dated: April 6, 2026

Whether or not you expect to attend the Annual Meeting in person, we urge you to read the proxy statement and to submit your proxy or voting instructions as soon as possible. This will ensure the presence of a quorum at the Annual Meeting. Promptly voting your shares will save the Company the expenses and extra work of additional solicitation. For information on how to vote your shares, please refer to the section of the proxy statement entitled “Questions and Answers About this Proxy Statement and Voting” and to the instructions provided in your proxy card, voting instruction card or Notice of Internet Availability of Proxy Materials. Please vote or provide instructions electronically over the Internet or, if you receive a paper copy of the proxy card or voting instruction form by mail, by dating, signing and returning the proxy card or voting instruction form in the business envelope provided. Submitting your proxy now will not prevent you from voting your shares at the Annual Meeting if you desire to do so, as your proxy is revocable at your option. Your vote is important, so please act today!

TABLE OF CONTENTS

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IMMIX BIOPHARMA, INC.

11400 West Olympic Blvd., Suite 200

Los Angeles, CA 90064

PROXY STATEMENT FOR THE

2026 ANNUAL MEETING OF STOCKHOLDERS

TO BE HELD ON may 22, 2026