Former executive chairman files Form 4 in Cannabist Co (CBSTF)

Rhea-AI Filing Summary

Cannabist Co Holdings Inc. received a Form 4 insider ownership report related to its stock. The filing lists Michael Abbott as the sole reporting person, identified as the company’s Former Executive Chairman, and indicates the form is filed by one reporting person.

The document includes standard tables for non-derivative and derivative securities to show any shares acquired, disposed of, or beneficially owned, as well as a signature block executed by an attorney-in-fact on Abbott’s behalf. It records an earliest transaction date of 10/03/2025, but the excerpt does not show specific transaction line items.

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

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X

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^*

ABBOTT MICHAEL

(Last) (First) (Middle)

C/O CANNABIST CO HOLDINGS INC.

321 BILLERICA ROAD

(Street)

CHELMSFORD MA 01824

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Cannabist Co Holdings Inc. [ CBSTF ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

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

3. Date of Earliest Transaction (Month/Day/Year)
10/03/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

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

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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

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/ David Sirolly as attorney-in-fact for Michael Abbott	10/07/2025
	** 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.

FAQ

Who is the reporting person in the Cannabist Co (CBSTF) Form 4 filing?

The reporting person is Michael Abbott, identified as a Former Executive Chairman of Cannabist Co Holdings Inc. The Form 4 indicates it is filed by one reporting person, documenting his insider status in relation to the company’s securities.

What company is covered by this Form 4 related to CBSTF?

The Form 4 relates to Cannabist Co Holdings Inc., whose ticker symbol is listed as CBSTF. The filing documents insider ownership information and potential transactions involving the company’s securities by a former executive chairman.

What is the earliest transaction date shown in this Cannabist Co (CBSTF) Form 4?

The Form 4 identifies an earliest transaction date of 10/03/2025. This date marks the first relevant transaction covered by the report, even though the specific transaction line items are not included in the provided excerpt.

What types of securities are referenced in this Cannabist Co Form 4?

The filing includes standard tables for non-derivative securities (such as common shares) and derivative securities (like options or warrants). These tables are meant to show acquisitions, dispositions, and beneficial ownership tied to the reporting person.

Who signed the Cannabist Co (CBSTF) Form 4 filing?

The Form 4 is signed /s/ David Sirolly as attorney-in-fact for Michael Abbott. This indicates an authorized representative signed on Abbott’s behalf, a common practice when insiders grant power of attorney for SEC reporting.

How many reporting persons are included in this Cannabist Co Form 4?

The Form 4 is marked as filed by one reporting person. This means only Michael Abbott, the former executive chairman, is identified as a reporting person for the ownership and transaction information covered by this filing.