Disc Medicine holder to sell 912 shares

Disc Medicine, Inc. (IRON) received a notice that Atlas Venture Opportunity Fund I plans to sell 912 shares of its common stock under Rule 144 through Merrill Lynch.

Rhea-AI Filing Summary

Disc Medicine, Inc. (IRON) received a notice that Atlas Venture Opportunity Fund I plans to sell 912 shares of its common stock under Rule 144 through Merrill Lynch. The shares were acquired in a private placement from the issuer on May 1, 2020 for cash.

The planned sale has an aggregate market value of $72,385.44. As context, 38,392,844 shares of Disc Medicine common stock were outstanding as of September 4, 2026; this is a baseline figure, not the amount being offered.

Key Figures

Shares to be sold under Rule 144: 912 shares Aggregate market value: $72,385.44 Shares outstanding: 38,392,844 shares +2 more

5 metrics

Shares to be sold under Rule 144 912 shares Planned sale of Disc Medicine, Inc. common stock by Atlas Venture Opportunity Fund I

Aggregate market value $72,385.44 Value of 912 Disc Medicine, Inc. shares covered by the Rule 144 notice

Shares outstanding 38,392,844 shares Disc Medicine, Inc. common stock outstanding as of September 4, 2026

Acquisition date of shares May 1, 2020 Date the 912 shares were acquired in a private placement from the issuer

Date of Rule 144 notice September 4, 2026 Date the notice of proposed sale was given

Key Terms

Rule 144, aggregate market value, Private Placement, common stock

4 terms

Rule 144 regulatory

"plans to sell 912 shares of its common stock under 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.

aggregate market value financial

"The planned sale has an aggregate market value of $72,385.44"

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.

Private Placement financial

"The shares were acquired in a private placement from the issuer"

A private placement is a sale of securities directly to a selected group of investors, typically institutions or accredited investors, instead of through a public offering. It lets a company raise money faster and with fewer regulatory steps; for existing shareholders it matters because the newly issued shares, often sold at a discount, increase the share count and can dilute their ownership.

common stock financial

"912 shares of its common stock under Rule 144"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

FAQ

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

What does the Form 144 notice report for Disc Medicine (IRON)?

It reports that Atlas Venture Opportunity Fund I plans to sell 912 shares of Disc Medicine, Inc. common stock under Rule 144, with an aggregate market value of $72,385.44, through Merrill Lynch.

How many Disc Medicine (IRON) shares are covered by this Rule 144 notice?

The notice covers a proposed sale of 912 shares of Disc Medicine, Inc. common stock. These shares were previously acquired in a private placement from the issuer on May 1, 2020 for cash.

What is the aggregate market value of the Disc Medicine (IRON) shares in this Form 144?

The Rule 144 notice states an aggregate market value of $72,385.44 for the 912 shares of Disc Medicine, Inc. common stock that Atlas Venture Opportunity Fund I plans to sell.

How many Disc Medicine (IRON) shares were outstanding as context in the notice?

The notice lists 38,392,844 shares of Disc Medicine, Inc. common stock as outstanding as of September 4, 2026. This figure is provided for context and is not the number of shares being sold under Rule 144.

Through which broker and market will the Disc Medicine (IRON) shares be sold?

The notice identifies Merrill Lynch, located at One Bryant Park in New York, as the broker, and lists Nasdaq as the market on which the 912 shares of Disc Medicine, Inc. common stock are to be sold.

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

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Available on EDGAR 09/04/2026 - 04:35 PM EDT Accepted by SEC EDGAR 09/04/2026 - 04:34 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	0001759241
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	Disc Medicine, Inc.
SEC File Number	001-39438
Address of Issuer	321 ARSENAL STREET, SUITE 101 WATERTOWN MASSACHUSETTS 02472
Phone	617-674-9274
Name of Person for Whose Account the Securities are To Be Sold	Atlas Venture Opportunity Fund I, LP
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	Shareholder

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 Stock	Merrill Lynch One Bryant Park New York NY 10036	912	72385.44	38392844	09/04/2026	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 Stock	05/01/2020	Private Placement	Issuer			912	05/01/2020	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

Nothing to Report

144: Remarks and Signature

Remarks	See attached Table II for sales of securities over the last three months.
Date of Notice	09/04/2026
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	Ommer Chohan
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)