Cullinan Therapeutics officer proposes $50K share sale

Jennifer Michaelson's prior 10b5-1 sales included 8,000 shares on September 8 and 30,000 shares on August 13, 2026.

Available on EDGAR 11/05/2026 - 04:32 PM EST Accepted by SEC EDGAR 11/05/2026 - 04:29 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Cullinan Therapeutics, Inc. (CGEM) officer Jennifer Michaelson reported a proposed sale of 4,000 common shares, with an aggregate market value of $49,960 and an approximate sale date of November 5, 2026. Morgan Stanley Smith Barney LLC is listed as broker, and the issuer information gives 64,354,694 shares outstanding. The reported prior 10b5-1 sales were 8,000 shares on September 8, 2026, and 30,000 shares on August 13, 2026.

Key Figures

Common shares proposed for sale: 4,000 shares Aggregate market value of proposed sale: $49,960 Shares outstanding: 64,354,694 shares +2 more

5 metrics

Common shares proposed for sale 4,000 shares Approximate sale date November 5, 2026

Aggregate market value of proposed sale $49,960 Proposed sale of common shares

Shares outstanding 64,354,694 shares Issuer information

Prior common shares sold 8,000 shares September 8, 2026; listed aggregate market value $172,547.20

Prior common shares sold 30,000 shares August 13, 2026; listed aggregate market value $607,800.00

Key Terms

Rule 144, 10b5-1 Sales, Exercise of Stock Options, Employee Stock Purchase Plan

4 terms

Rule 144 regulatory

"definition of "person" in paragraph (a) of Rule 144"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

10b5-1 Sales regulatory

"10b5-1 Sales for Jennifer Michaelson"

10b5-1 sales are pre-arranged stock-trading plans that let company insiders automatically buy or sell shares according to a fixed schedule or formula, even if they later learn confidential information. Think of it as setting up an automatic thermostat for trades: it creates a clear, documented path that can protect insiders from insider-trading accusations and gives investors a signal about predictable insider activity—though it can also simply be a way for insiders to diversify or raise cash.

Exercise of Stock Options financial

"Exercise of Stock Options"

Employee Stock Purchase Plan financial

"Employee Stock Purchase Plan"

An employee stock purchase plan is a company program that lets workers buy shares through small payroll deductions, often at a discount to the market price and after a set offering period. Think of it like a workplace savings plan that turns into ownership: it encourages employees to share in the company’s success and can create predictable buying or selling of stock that investors watch because it affects supply, demand and employee incentives.

FAQ

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

How many CGEM shares does officer Jennifer Michaelson propose to sell?

Officer Jennifer Michaelson's proposed sale is 4,000 common shares, with an aggregate market value of $49,960 and an approximate sale date of November 5, 2026.

What prior CGEM sales are listed for Jennifer Michaelson?

The reported prior sales were 8,000 common shares on September 8, 2026, with a listed aggregate market value of $172,547.20, and 30,000 common shares on August 13, 2026, with a listed aggregate market value of $607,800.00. Both appear under the 10b5-1 sales listing for Jennifer Michaelson.

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

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001838061
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	CULLINAN THERAPEUTICS, INC.
SEC File Number	001-39856
Address of Issuer	One Main Street Suite 1350 Cambridge MASSACHUSETTS 02142
Phone	6174104650
Name of Person for Whose Account the Securities are To Be Sold	JENNIFER MICHAELSON
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	4000	49960.00	64354694	11/05/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	11/05/2026	Exercise of Stock Options	Issuer			3805	11/05/2026	Cash
Common	06/28/2024	Employee Stock Purchase Plan	Issuer			195	06/28/2024	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for JENNIFER MICHAELSON One Main Street Suite 1350 Cambridge MA 02142	Common	09/08/2026	8000	172547.20
10b5-1 Sales for JENNIFER MICHAELSON One Main Street Suite 1350 Cambridge MA 02142	Common	08/13/2026	30000	607800.00

144: Remarks and Signature

Remarks
Date of Notice	11/05/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	08/07/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Jennifer Michaelson
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)