Form 144: Notice to Resell 10,035 Common Shares

Daniel Rollings Karlin submitted a notice under Form 144 relating to Common stock held with Morgan Stanley Smith Barney LLC Executive Financial Services.

Rhea-AI Filing Summary

Daniel Rollings Karlin submitted a notice under Form 144 relating to Common stock held with Morgan Stanley Smith Barney LLC Executive Financial Services. The notice lists 10,035 shares tied to restricted stock vesting under a registered plan with a 06/25/2026 date. The filing also records 8,018 shares sold during the past three months on 03/25/2026.

Insights

Equity Securities Counsel

Form 144 notice for planned resale of vested restricted shares.

The filing lists 10,035 shares associated with restricted stock vesting under a registered plan dated 06/25/2026. It also records a prior sale of 8,018 shares on 03/25/2026, which is a factual background item required by the form.

Timing and transfer mechanics are governed by the vesting event and any plan terms; the filing shows the method as "Restricted Stock Vesting Under a Registered Plan" and identifies the broker/agent. Subsequent public-sale activity will depend on compliance with applicable resale conditions and plan limitations.

Key Figures

Shares tied to vesting: 10,035 shares Shares sold in past 3 months: 8,018 shares Dollar amount associated with 8,018 sale line: $148,092.46 +1 more

4 metrics

Shares tied to vesting 10,035 shares Restricted Stock Vesting Under a Registered Plan on 06/25/2026

Shares sold in past 3 months 8,018 shares Sale date 03/25/2026

Dollar amount associated with 8,018 sale line $148,092.46 Listed alongside the 8,018-share entry for 03/25/2026

Dollar figure in securities header $422,774.55 Value appearing in the securities information header

Key Terms

Form 144, Restricted Stock Vesting Under a Registered Plan, Broker/Dealer (Morgan Stanley Smith Barney LLC)

3 terms

Form 144 regulatory

"144: Filer Information"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Restricted Stock Vesting Under a Registered Plan financial

"Securities To Be Sold | Restricted Stock Vesting Under a Registered Plan"

Broker/Dealer (Morgan Stanley Smith Barney LLC) financial

"Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza"

FAQ

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

What does the Form 144 for DFTX report?

The Form 144 reports a notice of proposed resale of Common stock by Daniel Rollings Karlin. It lists 10,035 shares tied to restricted stock vesting and a prior sale of 8,018 shares on 03/25/2026.

How many shares are tied to the restricted stock vesting noted in the filing for DFTX?

The filing lists 10,035 shares associated with "Restricted Stock Vesting Under a Registered Plan" dated 06/25/2026. The entry is presented as the vesting-related quantity in the notice.

Did the filer sell any DFTX shares recently?

Yes. The Form 144 records 8,018 shares sold during the past three months, with the sale date shown as 03/25/2026. That sale is disclosed as prior activity on the form.

Who is the broker or agent listed on the DFTX Form 144?

The broker/agent named is Morgan Stanley Smith Barney LLC Executive Financial Services at 1 New York Plaza, 8th Floor, New York, NY. That firm is identified in the securities-to-be-sold section.

What sale method is indicated for the shares in this DFTX filing?

The filing describes the shares as resulting from "Restricted Stock Vesting Under a Registered Plan." The statement indicates the vesting event as the source of the shares to be sold.

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

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Accepted by SEC EDGAR 06/25/2026 - 04:07 PM 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	0001897618
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	DANIEL ROLLINGS KARLIN
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	10035	422774.55	109066783	06/25/2026	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	06/25/2026	Restricted Stock Vesting Under a Registered Plan	Issuer			10035	06/25/2026	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
DANIEL ROLLINGS KARLIN ONE WORLD TRADE CENTER SUITE 8500 NEW YORK NY 10007	Common	03/25/2026	8018	148092.46

144: Remarks and Signature

Remarks
Date of Notice	06/25/2026
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/ Daniel Rollings Karlin
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)