Disc Medicine holder may sell 6,822 shares

Atlas Venture Fund X has filed to potentially sell 6,822 IRON common shares originally acquired in a 2020 private placement.

Rhea-AI Filing Summary

Disc Medicine, Inc. (IRON) is the subject of a Form 144 notice filed for the account of Atlas Venture Fund X covering a proposed sale of 6,822 shares of common stock through Merrill Lynch on Nasdaq. The shares were acquired in a May 1, 2020 private placement for cash. A figure of 38,392,844 shares is listed for Disc Medicine’s common stock as of September 3, 2026; this is a baseline figure, not the amount being sold.

Key Figures

Shares covered by Form 144: 6,822 shares Aggregate market value of securities: $546,101.10 Listed Disc Medicine common shares: 38,392,844 shares +2 more

5 metrics

Shares covered by Form 144 6,822 shares Common stock potentially to be sold for the account of Atlas Venture Fund X

Aggregate market value of securities $546,101.10 Figure listed on the common stock securities information line

Listed Disc Medicine common shares 38,392,844 shares Share count shown in the securities information section dated September 3, 2026

Date of Notice September 3, 2026 Date the Form 144 notice is dated

Acquisition date of shares May 1, 2020 Date the common stock was acquired in a private placement for cash

Key Terms

Rule 144, Private Placement, Aggregate market value, Nasdaq

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.

Private Placement financial

"Common Stock | 05/01/2020 | Private Placement | 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.

Aggregate market value financial

"Common Stock | Merrill Lynch One Bryant Park New York NY 10036 | 6822 | 546101.1"

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.

Nasdaq market

"38392844 | 09/03/2026 | Nasdaq"

The Nasdaq is a stock exchange where many companies' shares are bought and sold, functioning much like a marketplace for investments. It matters to investors because it provides a platform to buy and sell ownership stakes in companies, helping them track the value of those companies and make informed decisions. As one of the largest and most technology-focused markets, it also reflects trends and developments in the business world.

FAQ

What does the Form 144 filing mean for Disc Medicine, Inc. (IRON)?

The filing reports that Atlas Venture Fund X may sell 6,822 shares of Disc Medicine common stock under Rule 144 through Merrill Lynch on Nasdaq. It is a notice of a potential resale by a shareholder, not an issuance of new shares by the company.

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

The notice covers a potential sale of 6,822 shares of common stock. This is the maximum number listed in the Form 144 securities information and securities-to-be-sold sections for this shareholder.

Who is selling shares of Disc Medicine (IRON) in this Form 144?

The notice is filed for the account of Atlas Venture Fund X, identified as the shareholder whose securities may be sold. The broker listed for the transaction is Merrill Lynch at One Bryant Park, New York.

When and how were the Disc Medicine (IRON) shares originally acquired?

The Form 144 states that the common stock was acquired on May 1, 2020 in a Private Placement from the issuer for cash. This information appears in the “Securities To Be Sold” section.

What share count for Disc Medicine (IRON) is listed in the Form 144?

The filing lists 38,392,844 shares of Disc Medicine common stock alongside the securities information line dated September 3, 2026. This figure serves as a referenced share count, separate from the 6,822 shares covered by the notice.

On which market are the Disc Medicine (IRON) shares in this notice traded?

The Form 144 identifies Nasdaq in the securities information section as the market for the common stock associated with this potential sale.

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

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Available on EDGAR 09/03/2026 - 05:38 PM Accepted by SEC EDGAR 09/03/2026 - 05:08 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	0001628098
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 Fund X, 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	6822	546101.1	38392844	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 Stock	05/01/2020	Private Placement	Issuer			6822	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	09/03/2026
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	Ommer Chohan
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)