Company: HSDTW
Filing Date: 2025-04-22
Form Type: PRE 14A
Source: 0001104659-25-037535
Chunk: 3

Company: Solana Co
Filing Date: 2025-04-22
Form: PRE 14A
Chunk 3
---
 sign, date and return the proxy card or voting instruction card. If you received this notice and the accompanying proxy statement in the mail, a return envelope is enclosed for your convenience. This will not prevent you from voting at the Special Meeting since you may revoke your proxy at any time prior to the Special Meeting or vote electronically at the Special Meeting, but submitting your proxy will help to ensure the presence of a quorum at the Special Meeting and avoid added proxy solicitation costs.

By Order of the Board of Directors,

Jeffrey S. Mathiesen 
 Chief Financial Officer, Treasurer and Secretary

Newtown, Pennsylvania 
 , 2025

<div align='center'>**Important Notice Regarding the Availability of Proxy Materials for the 
 Helius Medical Technologies, Inc. Special Meeting of Stockholders to be Held on May 23, 2025:

The Notice of Special Meeting of Stockholders, accompanying proxy statement and annual report to**</div>

#### stockholders are available at www.proxyvote.com.
**TABLE OF CONTENTS

TABLE OF CONTENTS**

| ​ | QUESTIONS AND ANSWERS ABOUT THE SPECIAL MEETING | ​ | ​ | ​ | ​ |  1 | ​ | ​ |
| ​ | PROPOSAL 1 — REVERSE STOCK SPLIT                | ​ | ​ | ​ | ​ |  4 | ​ | ​ |
| ​ | PROPOSAL 2 — INCREASE OF AUTHORIZED SHARES      | ​ | ​ | ​ | ​ | 12 | ​ | ​ |
| ​ | PROPOSAL 3 — POTENTIAL FINANCING ISSUANCES      | ​ | ​ | ​ | ​ | 14 | ​ | ​ |
| ​ | PROPOSAL 4 — ADJOURNMENT OF SPECIAL MEETING     | ​ | ​ | ​ | ​ | 15 | ​ | ​ |
| ​ | ADDITIONAL MATTERS                              | ​ | ​ | ​ | ​ | 18 | ​ | ​ |

i

TABLE OF CONTENTS

#### HELIUS MEDICAL TECHNOLOGIES, INC.PROXY STATEMENT

#### 2025 SPECIAL MEETING OF STOCKHOLDERSMay 23, 2025

### QUESTIONS AND ANSWERS ABOUT THE SPECIAL MEETING

#### Who is soliciting my vote?
The Board of Directors (the “

#### Board
”) of Helius Medical Technologies, Inc. (the “

#### Company
”, “

#### we
”