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ProMIS Neurosciences’ Neil Cashman buys 10,000 shares

The reported holdings also include 4,122 shares held by Research Capital Corporation and 664 shares held by his spouse.

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Form Type
4

Rhea-AI Filing Summary

ProMIS Neurosciences Inc. (PMN) Chief Scientific Officer and director Neil Cashman purchased 10,000 common shares on November 2, 2026, at $3.86 per share. Afterward, he reported direct holdings of 14,532 shares. Separate indirect holdings reported were 4,122 shares by Research Capital Corporation and 664 shares by his spouse. No Rule 10b5-1 plan is reported.

Insider Cashman Neil
Role Chief Scientific Officer
Bought 10,000 shs ($39K)
Increase in Position 220.7%
Type Security Shares Price Value
Purchase Common Shares 10,000 $3.86 $39K
Holding Common Shares -- -- --
Holding Common Shares -- -- --
Holdings After Transaction: Common Shares — 14,532 shares (Direct); Common Shares — 4,122 shares (Indirect, By Research Capital Corporation); Common Shares — 664 shares (Indirect, By his spouse)
Holdings Before and After: Common Shares, 4,532 to 14,532 shares (Direct)
Other Insiders: 1 other insider reported open-market purchases of this stock in the 30 days up to this filing.
Common shares purchased 10,000 shares November 2, 2026
Purchase price $3.86 per share November 2, 2026
Direct holdings after purchase 14,532 shares Reported November 2, 2026
Indirect holdings by Research Capital Corporation 4,122 shares Reported November 2, 2026
Indirect holdings by spouse 664 shares Reported November 2, 2026

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How many PMN shares did Neil Cashman buy?

Neil Cashman, ProMIS Neurosciences' Chief Scientific Officer and a director, purchased 10,000 common shares on November 2, 2026, at $3.86 per share. He reported 14,532 shares directly after the purchase; no Rule 10b5-1 plan is reported.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Cashman Neil

(Last)(First)(Middle)
C/O PROMIS NEUROSCIENCES INC.
SUITE 200, 1920 YONGE STREET

(Street)
TORONTOM4S 3E2

(City)(State)(Zip)

ONTARIO, CANADA

(Country)
2. Issuer Name and Ticker or Trading Symbol
ProMIS Neurosciences Inc. [ PMN ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
XOfficer (give title below)Other (specify below)
Chief Scientific Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
11/02/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Common Shares11/02/2026P10,000A$3.8614,532D
Common Shares4,122IBy Research Capital Corporation
Common Shares664IBy his spouse
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
/s/ Max A. Milbury, Attorney in Fact for Neil Cashman11/03/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

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