Definium holder plans $718K Rule 144 share sale

Shareholder Robert B. Barrow files a Rule 144 notice to sell 19,023 DFTX shares valued at about $718,000 after recent equity compensation and prior sales.

Rhea-AI Filing Summary

Definium Therapeutics, Inc. (DFTX) is the subject of a notice that shareholder Robert B. Barrow intends to sell 19,023 shares of common stock under Rule 144 through Morgan Stanley Smith Barney LLC, with an aggregate market value of $718,144.88 as of the planned sale date of September 3, 2026.

These shares are tied to Performance Stock Units acquired from the issuer as compensation for services rendered on September 3, 2026, and follow a prior sale of 29,208 shares for $1,230,533.04 during the past three months.

Key Figures

Shares to be sold under Rule 144: 19,023 shares Aggregate market value of planned sale: $718,144.88 Shares outstanding: 134,366,950 shares +4 more

7 metrics

Shares to be sold under Rule 144 19,023 shares Planned sale of Definium Therapeutics, Inc. common stock

Aggregate market value of planned sale $718,144.88 Value of 19,023 shares of DFTX common stock

Shares outstanding 134,366,950 shares Definium Therapeutics, Inc. common stock outstanding

Shares sold in prior 3 months 29,208 shares Sale on June 25, 2026 by Robert B. Barrow

Aggregate value of prior 3‑month sale $1,230,533.04 Value of 29,208 DFTX shares sold on June 25, 2026

Date acquired for current block September 3, 2026 Acquisition date of Performance Stock Units underlying 19,023 shares

Approximate date of sale September 3, 2026 Planned sale date for 19,023 shares under Rule 144

Key Terms

Rule 144, Performance Stock Units, aggregate market value, services rendered

4 terms

Rule 144 regulatory

"See the 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.

Performance Stock Units financial

"Common | 09/03/2026 | Performance Stock Units | Issuer"

Performance stock units are a type of company award that grants employees shares of stock only if certain performance goals are met. They motivate employees to work toward specific company achievements, aligning their interests with those of shareholders. For investors, they can influence a company's future stock supply and reflect management’s confidence in reaching key targets.

aggregate market value financial

"Common | Morgan Stanley Smith Barney LLC ... | 19023 | 718144.88"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

services rendered financial

"19023 | 09/03/2026 | Services Rendered"

FAQ

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

What does the Form 144 filing disclose for Definium Therapeutics, Inc. (DFTX)?

It discloses that Robert B. Barrow plans to sell 19,023 shares of DFTX common stock under Rule 144 through Morgan Stanley Smith Barney LLC, with an aggregate market value of $718,144.88, based on information as of September 3, 2026.

How many Definium Therapeutics (DFTX) shares is Robert B. Barrow planning to sell?

Robert B. Barrow plans to sell 19,023 shares of Definium Therapeutics, Inc. common stock under Rule 144, with an indicated aggregate market value of $718,144.88 at the time of the notice.

What type of securities are covered in this DFTX Form 144 filing?

The filing covers common stock of Definium Therapeutics, Inc. related to Performance Stock Units acquired from the issuer on September 3, 2026 as services rendered compensation.

What prior sales by Robert B. Barrow in DFTX stock are disclosed?

The notice reports that during the past three months, on June 25, 2026, Robert B. Barrow sold 29,208 shares of DFTX common stock for an aggregate value of $1,230,533.04.

How many Definium Therapeutics (DFTX) shares are stated as outstanding in the filing?

The filing lists 134,366,950 shares of Definium Therapeutics, Inc. common stock as outstanding, providing context for the planned Rule 144 sale of 19,023 shares.

Which broker is handling the planned Rule 144 sale for DFTX shares?

The planned sale of 19,023 DFTX shares is to be executed through Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, New York, NY, as identified in the notice.

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

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Available on EDGAR 09/03/2026 - 05:50 PM EDT Accepted by SEC EDGAR 09/03/2026 - 04:28 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	0001897557
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	ROBERT B BARROW
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
Relationship to Issuer	Director

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	19023	718144.88	134366950	09/03/2026	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	09/03/2026	Performance Stock Units	Issuer			19023	09/03/2026	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
ROBERT B BARROW ONE WORLD TRADE CENTER SUITE 8500 NEW YORK NY 10007	Common	06/25/2026	29208	1230533.04

144: Remarks and Signature

Remarks
Date of Notice	09/03/2026
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/ Robert Barrow
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)