Insider 10b5-1 Sales by Jennifer Michaelson

Jennifer Michaelson reported multiple 10b5-1 sales of common stock under Form 144, covering transactions from 12/12/2025 through 02/23/2026.

Rhea-AI Filing Summary

Jennifer Michaelson reported multiple 10b5-1 sales of common stock under Form 144, covering transactions from 12/12/2025 through 02/23/2026. The filing lists several dispositions, including 8,000 shares on 02/20/2026 and 1,752 shares on 02/23/2026.

Insights

Insider Transactions Analyst

Planned 10b5-1 sales by an insider across multiple dates; routine disclosure.

The filing lists sequential dispositions of common stock by Jennifer Michaelson under a 10b5-1 arrangement, with executed trades between 12/12/2025 and 02/23/2026

These entries are transactional records; cash‑flow recipients are the selling person. Subsequent filings may report further executions or settlement details.

Corporate Governance Specialist

Disclosure aligns with routine insider-sale reporting obligations, not a corporate action.

The entries document dispositions and dates, showing the mechanism as 10b5-1 sales. The filing does not state any company-directed sale or corporate issuance.

Review future Forms 4/144 for additional volumes or changes to trading plans.

FAQ

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

What did Jennifer Michaelson report in the Form 144 for CGEM?

The Form 144 reports multiple 10b5-1 sales of common stock by Jennifer Michaelson. The listed transactions span 12/12/2025 to 02/23/2026, showing executed dispositions on specific trade dates and share counts.

How many shares are shown in the largest individual sale listed?

The largest single sale shown in the excerpt is 8,000 shares on 02/20/2026. The filing itemizes individual trade dates and share counts rather than an aggregated total for all transactions.

Were these sales made under a trading plan or as open market trades?

The excerpt identifies the transactions as 10b5-1 sales, indicating they were executed under a prearranged trading plan. The filing lists each trade date and share amount tied to that plan.

Does the Form 144 show proceeds received by the company?

No. The entries record insider dispositions of common stock; they list share counts and trade dates. The filing does not state any proceeds being received by the issuer or changes to company capital accounts.

What date range do the reported transactions cover in this filing?

The reported transactions in the excerpt cover trade dates from 12/12/2025 through 02/23/2026, with multiple discrete sales recorded on those dates.

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

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Accepted by SEC EDGAR 02/25/2026 - 04:33 PM EST Learn about SEC filing dates

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	1780	25400.60	59076259	02/25/2026	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	02/22/2026	Restricted Stock Units	Issuer			1780	02/22/2026	N/A

* 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	02/23/2026	1752	24515.56
10b5-1 Sales for JENNIFER MICHAELSON One Main Street Suite 1350 Cambridge MA 02142	Common	02/20/2026	8000	114400.00
JENNIFER MICHAELSON One Main Street Suite 1350 Cambridge MA 02142	Common	02/12/2026	416	5004.48
10b5-1 Sales for JENNIFER MICHAELSON One Main Street Suite 1350 Cambridge MA 02142	Common	01/22/2026	4000	49200.00
10b5-1 Sales for JENNIFER MICHAELSON One Main Street Suite 1350 Cambridge MA 02142	Common	12/19/2025	1345	13458.34
JENNIFER MICHAELSON One Main Street Suite 1350 Cambridge MA 02142	Common	12/18/2025	2898	28023.66
10b5-1 Sales for JENNIFER MICHAELSON One Main Street Suite 1350 Cambridge MA 02142	Common	12/15/2025	995	11840.50
JENNIFER MICHAELSON One Main Street Suite 1350 Cambridge MA 02142	Common	12/12/2025	2148	26592.24

144: Remarks and Signature

Remarks
Date of Notice	02/25/2026
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)