Director Kirwin’s entity buys 4,000 ProMIS (PMN) shares at $11.33

Rhea-AI Filing Summary

ProMIS Neurosciences Inc. director Patrick D. Kirwin reported an open-market purchase of Common Shares through an associated professional corporation. The entity bought 4,000 shares at $11.33 per share, and now holds 4,653 shares indirectly. Kirwin also holds 5,135 shares directly and 305 shares indirectly through his spouse.

Insider Trade Summary

Net Buyer: 4,000 shares ($45,320)

Net Buy 3 txns

Insider Kirwin Patrick D.

Role null

Bought 4,000 shs ($45K)

Type	Security	Shares	Price	Value
Purchase	Common Shares	4,000	$11.33	$45K
holding	Common Shares	--	--	--
holding	Common Shares	--	--	--

Holdings After Transaction: Common Shares — 4,653 shares (Indirect, By Patrick D. Kirwin Professional Corp); Common Shares — 5,135 shares (Direct, null)

Footnotes (1)

Key Figures

Open-market purchase size: 4,000 shares Purchase price: $11.33 per share Indirect holdings via professional corporation: 4,653 shares +2 more

5 metrics

Open-market purchase size 4,000 shares Common Shares bought in open market (code P)

Purchase price $11.33 per share Price for 4,000 Common Shares

Indirect holdings via professional corporation 4,653 shares Total Common Shares after purchase

Direct holdings 5,135 shares Common Shares held directly after transactions

Indirect holdings via spouse 305 shares Common Shares held indirectly by spouse

Key Terms

open-market purchase, Common Shares, indirect, transaction code, +1 more

5 terms

open-market purchase financial

"transaction_action": "open-market purchase""

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

Common Shares financial

""security_title": "Common Shares" for each transaction"

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.

indirect financial

""ownership_type": "indirect" for certain holdings"

transaction code financial

""transaction_code_description": "Purchase in open market or private transaction""

net-buy financial

""netBuySellDirection": "net-buy" in transactionSummary"

Form 4 Insider Transactions: What Each Field Means →

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^*

Kirwin Patrick D.

(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)
04/22/2026

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	04/22/2026		P		4,000	A	$11.33	4,653	I	By Patrick D. Kirwin Professional Corp
Common Shares								305	I	By his spouse
Common Shares								5,135	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 Patrick Kirwin	04/23/2026
	** 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)

FAQ

What insider transaction did ProMIS Neurosciences (PMN) report for Patrick D. Kirwin?

ProMIS Neurosciences reported that director Patrick D. Kirwin, through Patrick D. Kirwin Professional Corp, completed an open-market purchase of 4,000 Common Shares. The filing classifies this as a non-derivative transaction coded as a purchase in the open market.

How many ProMIS Neurosciences (PMN) shares did the entity associated with Patrick D. Kirwin buy and at what price?

An entity associated with Patrick D. Kirwin purchased 4,000 Common Shares of ProMIS Neurosciences at $11.33 per share. This transaction is identified as an open-market purchase and increased that entity’s indirect holdings to 4,653 shares following the transaction.

What are Patrick D. Kirwin’s direct and indirect ProMIS Neurosciences (PMN) holdings after the reported transactions?

After the reported transactions, Patrick D. Kirwin directly holds 5,135 Common Shares of ProMIS Neurosciences. Indirectly, he has 4,653 shares held by Patrick D. Kirwin Professional Corp and 305 shares held by his spouse, as disclosed in the Form 4 filing.

How is indirect ownership disclosed for Patrick D. Kirwin in the ProMIS Neurosciences (PMN) Form 4?

Indirect ownership is disclosed in two ways: 4,653 shares are held "By Patrick D. Kirwin Professional Corp," and 305 shares are held "By his spouse." The filing classifies these as indirect holdings, separate from his direct ownership position.

Does the ProMIS Neurosciences (PMN) Form 4 show any insider share sales by Patrick D. Kirwin?

The Form 4 for ProMIS Neurosciences shows no reported sales by Patrick D. Kirwin. The transaction summary indicates one open-market purchase totaling 4,000 shares and no sell transactions, resulting in a net-buy position for this filing.