Company: HSDTW
Filing Date: 2025-05-02
Form Type: DEF 14A
Source: 0001104659-25-044128
Chunk: 1

Company: Solana Co
Filing Date: 2025-05-02
Form: DEF 14A
Chunk 1
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4: To approve an amendment to the Helius Medical Technologies, Inc. 2022 Equity Incentive Plan; and

•

Proposal 5: To authorize one or more adjournments of the Special Meeting to solicit additional proxies in the event there are insufficient votes to approve Proposals 1, 2, 3, or 4.

Our Board of Directors unanimously recommends that you vote

#### FOR
Proposals 1, 2, 3, 4, and 5.

The special meeting will be a completely virtual meeting conducted via live webcast. You will be able to attend the Special Meeting online, vote electronically and submit your questions during the Special Meeting by visiting www.virtualshareholdermeeting.com/HSDT2025SM and entering your 16-digit control number. You will not be able to attend the Special Meeting in person.

Even if you are planning on attending the Special Meeting online, please promptly submit your proxy vote via the Internet, by telephone, or by completing, dating, signing and returning the enclosed proxy card or voting instruction card, so your shares will be represented at the Special Meeting. Instructions on voting your shares are in the proxy materials you received for the Special Meeting.

Details regarding admission to the virtual Special Meeting and the business to be conducted at the Special Meeting are more fully described in the accompanying Notice of Special Meeting of Stockholders and proxy statement. You are entitled to vote at our Special Meeting and any adjournments or postponements thereof only if you were a stockholder as of April 25, 2025.

Your vote is important. Whether or not you plan to attend the Special Meeting online, please submit your proxy vote as soon as possible so that your shares can be voted at our Special Meeting in accordance with your instructions . If you attend the meeting, you may revoke your proxy in accordance with the procedures set forth in the accompanying proxy statement and vote in person.

Thank you for your continued support of Helius Medical Technologies.

Sincerely,

Dane C. Andreeff 
 President and Chief Executive Officer

TABLE OF CONTENTS

#### HELIUS MEDICAL TECHNOLOGIES, INC.
<div align='center'>642 Newtown Yardley Road, Suite 100 
 Newtown, Pennsylvania 18940</div>

### NOTICE OF SPECIAL MEETING OF STOCKHOLDERS

#### TO BE HELD ON MAY 23, 2025
Notice is hereby given that a special meeting of stockholders of Helius Medical Technologies, Inc. (the “Company,” “Helius,” “