Mark Sullivan files to sell 10,702 shares

Mark Sullivan reports intent to sell 10,702 shares of Common Stock on 03/25/2026.

Rhea-AI Filing Summary

Mark Sullivan reports intent to sell 10,702 shares of Common Stock on 03/25/2026. The filing lists the shares as restricted stock vesting under a registered plan and identifies the transaction as involving the issuer. The filing also discloses a prior sale of 11,276 shares on 12/26/2025.

Insights

Securities Compliance Counsel

Rule 144 notice for a restricted stock vesting and planned sale.

The filing shows 10,702 shares of Common Stock listed for sale on 03/25/2026, described as restricted stock vesting under a registered plan. The method is identified as "Issuer" in the excerpt.

Past activity includes a sale of 11,276 shares on 12/26/2025. Transaction timing and precise cash‑flow treatment beyond the aggregate values shown are not provided in the excerpt.

FAQ

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

What does the Form 144 for DFTX disclose about planned sales?

The Form 144 states the intention to sell 10,702 shares of Common Stock on 03/25/2026. It characterizes the shares as restricted stock vesting under a registered plan and lists the seller method as Issuer.

Did the filer report any recent sales before this Form 144?

Yes. The excerpt reports a prior sale of 11,276 shares of Common Stock on 12/26/2025. An aggregate dollar amount of $148,244.00 is shown for that past sale in the excerpt.

What is the aggregate value shown for the planned sale on 03/25/2026?

The excerpt shows an aggregate amount of $197,665.94 associated with a line that includes 10,702 shares and the date 03/25/2026. The filing ties the dollar figure to the securities line in the excerpt.

How are the shares described in the Form 144?

The shares are described as restricted stock vesting under a registered plan and the filing lists the transaction method as Issuer. The excerpt ties the vesting description to the planned sale date 03/25/2026.

Who is named as the selling or reporting party in the excerpt?

The excerpt lists Mark Sullivan with an address at One World Trade Center, Suite 8500, New York, NY. That name appears alongside the past sale entry dated 12/26/2025.

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

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Accepted by SEC EDGAR 03/25/2026 - 05:39 PM EDT 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	0001331843
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	DEFINIUM THERAPEUTICS, INC.
SEC File Number	001-40360
Address of Issuer	ONE WORLD TRADE CENTER SUITE 8500 NEW YORK NEW YORK 10007
Phone	212-220-6633
Name of Person for Whose Account the Securities are To Be Sold	MARK SULLIVAN
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	10702	197665.94	99698129	03/25/2026	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	03/25/2026	Restricted stock vesting under a registered plan	Issuer			10702	03/25/2026	Services Rendered

* 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
Mark Sullivan ONE WORLD TRADE CENTER SUITE 8500 NEW YORK NY 10007	Common	12/26/2025	11276	148244.00

144: Remarks and Signature

Remarks
Date of Notice	03/25/2026
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/ Mark Sullivan
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)