ProMIS Neurosciences director buys 1,316 shares

Eugene Williams’ direct PMN holdings stood at 13,713 common shares after the reported purchase.

Available on EDGAR 11/03/2026 - 08:28 AM EST Accepted by SEC EDGAR 11/03/2026 - 08:28 AM EST Learn about SEC filing dates

Rhea-AI Filing Summary

ProMIS Neurosciences Inc. (PMN) director Eugene Williams purchased 1,316 common shares on October 30, 2026, at $3.99 per share. The transaction was reported as a purchase in the open market or a private transaction, and his direct holdings following it were 13,713 common shares. The Rule 10b5-1 plan box was unchecked.

Insider Trade Summary

Net Buyer: 1,316 shares

Net Buy 1 txn

Insider Williams Eugene

Role Director

Bought 1,316 shs ($5K)

Increase in Position 10.6%

Type	Security	Shares	Price	Value
Purchase	Common Shares	1,316	$3.99	$5K

Holdings After Transaction: Common Shares — 13,713 shares (Direct)

Holdings Before and After: Common Shares, 12,397 to 13,713 shares (Direct)

Other Insiders: 1 other insider reported open-market purchases of this stock in the 30 days up to this filing.

Key Figures

Shares purchased: 1,316 common shares Purchase price per share: $3.99 per share Direct holdings after purchase: 13,713 common shares

3 metrics

Shares purchased 1,316 common shares October 30, 2026

Purchase price per share $3.99 per share October 30, 2026 purchase

Direct holdings after purchase 13,713 common shares Following the October 30, 2026 purchase

Key Terms

Common Shares, direct ownership, Rule 10b5-1 plan

3 terms

Common Shares financial

"purchased 1,316 common shares"

Common shares are the basic units of ownership in a company that give holders a claim on profits and a right to vote on key matters, like electing the board. Think of them as membership cards in a club: they let you share in successes and losses, but in a bankruptcy or liquidation they are paid after creditors and preferred shareholders, so their value can swing more and matters for assessing risk and potential return.

direct ownership financial

"his direct holdings following it"

Rule 10b5-1 plan regulatory

"Rule 10b5-1 plan box was unchecked"

A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many PMN shares did director Eugene Williams buy?

Eugene Williams purchased 1,316 common shares on October 30, 2026, at $3.99 per share. His direct holdings after the purchase were 13,713 common shares. The transaction was described as a purchase in the open market or a private transaction, and the Rule 10b5-1 plan box was unchecked.

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

Form 4 Insider Transactions: What Each Field Means →

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SEC Form 4

FORM 4

UNITED 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^*

Williams Eugene

(Last) (First) (Middle)

C/O PROMIS NEUROSCIENCES INC.

SUITE 200, 1920 YONGE STREET

(Street)

TORONTO M4S 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)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/30/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form 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)
			Code	V	Amount	(A) or (D)	Price
Common Shares	10/30/2026		P		1,316	A	$3.99	13,713	D

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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

	/s/ Max A. Milbury, Attorney in Fact for Eugene Williams	11/03/2026
	** Signature of Reporting Person	Date
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)