Form S-8 ProMIS Neurosciences

As filed with the Securities and Exchange Commission on May 29, 2026

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Registration No. 333-         

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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FORM S-8

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

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PROMIS NEUROSCIENCES INC.

(Exact name of Registrant as specified in its charter)

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PROMIS NEUROSCIENCES INC. 2025 STOCK OPTION AND INCENTIVE PLAN

PROMIS NEUROSCIENCES INC. 2026 INDUCEMENT PLAN

(Full title of the plans)

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CT Corporation System

1015 15th Street N.W., Suite 1000

Washington, D.C., 20005

(Name and address of agent for service)

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(416) 847-6898

(Telephone number, including area code, of agent for service)

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Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Securities Exchange Act of 1934, as amended.

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If an emerging growth company, indicate by check mark if the Registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act of 1933, as amended.    ☐

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Explanatory Note

This Registration Statement on Form S-8 (this “Registration Statement”) is filed by ProMIS Neurosciences Inc., a corporation continued under the Business Corporations Act (Ontario) (the “Registrant”), to register the offer and sale of (i) an additional 900,000 common shares, no par value per share (“Common Shares”) to be issued under the Registrant’s 2025 Stock Option and Incentive Plan, as amended (the “2025 Plan”), which was approved by the Registrant’s Board of Directors (the “Board”) on April 2, 2026 and by its stockholders on May 20, 2026 pursuant to Amendment No. 1 to the 2025 Plan (the “2025 Plan Amendment”), (ii) an additional 111,354 Common Shares to be issued under the Registrant’s 2025 Plan and (iii) an additional 180,000 Common Shares that may be issued pursuant to the ProMIS Neurosciences Inc. 2026 Inducement Plan (the “Inducement Plan”).

Amendment No. 1 to the 2025 Plan

On April 2, 2026 the Board approved the 2025 Plan Amendment, which increased the total number of Common Shares currently reserved and available for grant by 900,000 Common Shares resulting in the increase of the number of shares of Common Shares reserved and available for grant under the 2025 Plan to 1,017,868. The 2025 Plan Amendment was approved by shareholders on May 20, 2026. The additional shares are of the same class as other securities relating to the 2025 Plan for which the Registrant’s registration statement on Form S-8, File No. 333-289579, filed by the Registrant with the Securities and Exchange Commission (the “SEC”) on August 13, 2025, is effective.

2025 Plan Evergreen Increase

The number of shares of common stock reserved and available for issuance under the 2025 Plan is subject to an automatic annual increase on each January 1 by an amount equal to five percent (5%) of the number of Common Shares issued and outstanding and the number of shares issuable pursuant to the exercise of any outstanding, pre-funded warrants on the immediately preceding December 31, 2025. Accordingly, on January 1, 2026, the number of Common Shares reserved and available for issuance under 2025 Plan increased by 111,354. This Registration Statement registers these additional 111,354 Common Shares. The additional shares are of the same class as other securities relating to the 2025 Plan for which the Registrant’s registration statement on Form S-8, File No. 333-289579, filed by the Registrant with the SEC on August 13, 2025, is effective.

2026 Inducement Plan

On May 28, 2026, the Board adopted the Inducement Plan, pursuant to which the Registrant reserved 180,000 Common Shares to be issued exclusively for grants of equity-based awards to individuals who were not previously employees or directors of the Registrant, as an inducement material to the individual's entry into employment with the Registrant within the meaning of Rule 5635(c)(4) of the Marketplace Rules of the Nasdaq Stock Market (“Rule 5635(c)(4)”). The Inducement Plan provides for the grant of equity-based awards in the form of non-qualified stock options, stock appreciation rights, restricted stock units, restricted stock awards, unrestricted stock awards, and dividend equivalent rights. The Inducement Plan was adopted by the Board without stockholder approval pursuant to Rule 5635(c)(4). This Registration Statement registers these 180,000 Common Shares.

Part I — Information Required in the Section 10(a) Prospectus

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The documents containing the information specified in “Item 1. Plan Information” of Form S-8 will be sent or given to participants, as specified by Rule 428(b)(1) under the Securities Act of 1933 (the “Securities Act”). Such documents are not required to be, and are not, filed with the SEC either as part of this registration statement or as a prospectus or prospectus supplement pursuant to Rule 424 under the Securities Act. These documents and the documents incorporated by reference in this registration statement pursuant to Item 3 of Part II of Form S-8, taken together, constitute a prospectus that meets the requirements of Section 10(a) of the Securities Act.

Item 2. Registrant Information and Employee Plan Annual Information.

The Registrant will furnish without charge to each person to whom the prospectus is delivered, upon the written or oral request of such person, a copy of any and all of the documents incorporated by reference in Item 3 of Part II of this

Registration Statement, other than exhibits to such documents (unless such exhibits are specifically incorporated by reference to the information that is incorporated) and any other documents required to be delivered pursuant to Rule 428 under the Securities Act. Those documents are incorporated by reference in the Section 10(a) prospectus. Requests should be directed to ProMIS Neurosciences Inc., Suite 200, 1920 Yonge Street, Toronto, Ontario M4S 3E2, Attention: Corporate Secretary, telephone number (416) 847-6898.

Part II — Information Required in the Registration Statement

This Registration Statement incorporates by reference the documents set forth below that have been previously filed with the SEC:

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All documents filed by the Registrant pursuant to Section 13(a) or 15(d) of the United States Securities Exchange Act of 1934, as amended (the “Exchange Act”), subsequent to the date of this Registration Statement and prior to the filing of a post-effective amendment to this Registration Statement which indicates that all securities offered hereby have been sold or which deregisters all securities then remaining unsold, shall be deemed to be incorporated by reference into this registration statement and to be a part hereof commencing on the respective dates on which such documents are filed.

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    Not applicable.

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    Not applicable.

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Under the Business Corporations Act (Ontario) (the “OBCA”), the Registrant may indemnify its current or former directors or officers or another individual who acts or acted at its request as a director or officer, or an individual acting in a similar capacity, of another entity, against all costs, charges and expenses, including an amount paid to settle an action or satisfy a judgment, reasonably incurred by the individual in respect of any civil, criminal, administrative, investigative or other proceeding in which the individual is involved because of his or her association with the Registrant or another entity. The OBCA also provides that the Registrant may advance money to a director, officer or other individual for costs, charges and expenses reasonably incurred in connection with such a proceeding; provided that such individual shall repay the money if the individual does not fulfill the conditions described below.

However, indemnification is prohibited under the OBCA unless the individual:

The Registrant’s by-laws provide it may indemnify, subject to the OBCA, each of its current directors or officers or former directors or officers of the Registrant or of a corporation of which the Registration is or was a shareholder or creditor and the heirs and legal representatives of any such person against all costs, charges and expenses, including an amount paid to settle an action or satisfy a judgment, reasonably incurred by him or them in respect of any civil, criminal or administrative action or proceeding to which he is or they are made a party by reason of his being or having been a director or officer of the Registrant or a director or officer of such corporation, including any action brought by the Registrant or any such corporation.

The Registrant maintains insurance policies relating to certain liabilities that its directors and officers may incur in such capacity.

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    Not applicable.

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*Filed herewith

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(a) The undersigned Registrant hereby undertakes:

(1)To file, during any period in which offers or sales are being made, a post-effective amendment to this Registration Statement:

(i)            To include any prospectus required by Section 10(a)(3) of the Securities Act;

(ii)           To reflect in the prospectus any facts or events arising after the effective date of the Registration Statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the Registration Statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with the SEC pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no more than 20% change in the maximum aggregate offering price set forth in the “Calculation of Registration Fee” table in the effective Registration Statement; and

(iii)          To include any material information with respect to the plan of distribution not previously disclosed in the Registration Statement or any material change to such information in the Registration Statement; Provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the Registration Statement is on Form S-8 and the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the SEC by the Registrant pursuant to Section 13 or Section 15(d) of the Exchange Act that are incorporated by reference in the Registration Statement.

(2) That, for the purpose of determining any liability under the Securities Act, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof; and

(3) To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.

(b) The undersigned Registrant hereby undertakes that, for purposes of determining any liability under the Securities Act, each filing of the Registrant’s annual report pursuant to Section 13(a) or Section 15(d) of the Exchange Act (and, where applicable, each filing of an employee benefit plan’s annual report pursuant to Section 15(d) of the Exchange Act) that is incorporated by reference in the Registration Statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

(c) Insofar as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers and controlling persons of the Registrant pursuant to the foregoing provisions, or otherwise, the Registrant has been advised that in the opinion of the SEC such indemnification is against public policy as expressed in the Securities Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the Registrant of expenses incurred or paid by a director, officer or controlling person of the Registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the Registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act and will be governed by the final adjudication of such issue.

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SIGNATURES

Pursuant to the requirements of the Securities Act, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in Toronto, Ontario, Canada on May 29, 2026.

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Each person whose signature appears below constitutes and appoints Neil Warma, Daniel E. Geffken, and Max A. Milbury, or any of them, as his or her true and lawful attorneys-in-fact and agents, each of whom may act alone, with full powers of substitution and resubstitution, for him or her and in his name, place and stead, in any and all capacities, to sign any or all amendments to this registration statement, including post-effective amendments to this registration statement, registration statements filed pursuant to Rule 429 under the Securities Act, and any related registration statements necessary to register additional securities, and to file the same, with all exhibits thereto, and other documents and in connection therewith, with the Commission, granting unto said attorneys-in-fact and agents, and each of them the full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he or she might or could do in person, and hereby ratifies and confirms all his or her said attorneys-in-fact and agents or any of them or his or her substitute or substitutes may lawfully do or cause to be done by virtue hereof.

This Power of Attorney may be executed in multiple counterparts, each of which shall be deemed an original, but which taken together shall constitute one instrument.

Pursuant to the requirements of the Securities Act, this registration statement has been signed by the following persons in the capacities indicated on May 29, 2026.

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AUTHORIZED REPRESENTATIVE

Pursuant to the requirements of Section 6(a) of the Securities Act of 1933, as amended, the undersigned has signed this Form S-8, solely in its capacity as duly authorized representative of ProMIS Neurosciences Inc. in the United States, on May 29, 2026.

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