Disc Medicine holder to sell 26,552 shares

An affiliate of Disc Medicine, Inc. has filed a Rule 144 notice to sell 26,552 shares of IRON common stock previously acquired in a 2020 private placement.

Rhea-AI Filing Summary

Disc Medicine, Inc. (IRON) is the issuer of common stock that an affiliate, Atlas Venture Opportunity Fund I, has notified it plans to sell under Rule 144. The notice covers 26,552 shares of common stock, originally acquired in a private placement for cash on May 1, 2020, through broker Merrill Lynch.

Key Figures

Shares planned for sale: 26,552 shares Acquisition date of shares: May 1, 2020 Planned sale notice date: September 2, 2026

3 metrics

Shares planned for sale 26,552 shares Common Stock covered by the Rule 144 notice

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

Planned sale notice date September 2, 2026 Date the Rule 144 notice is dated

Key Terms

Rule 144, Private Placement, aggregate

3 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 regulatory

"sales are required by paragraph (e) of Rule 144 to be aggregated"

A combined total or summary created by adding together multiple parts or data points. Used as a noun and a verb, it means pooling individual items (sales, revenues, assets, transactions, or data) into one overall figure so stakeholders can see the big picture; like pouring many small jars into a single container to measure the total amount. Aggregate figures matter to investors because they show the overall size, trend, or exposure of a business or market rather than the detail of each component.

FAQ

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

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

The filing states that Atlas Venture Opportunity Fund I intends to sell 26,552 shares of Disc Medicine, Inc. common stock under Rule 144. This is a notice of a planned sale by an existing holder, not an issuance of new shares by the company.

How many IRON shares are planned to be sold under this Form 144?

The notice covers a planned sale of 26,552 shares of common stock of Disc Medicine, Inc. These shares are associated with Atlas Venture Opportunity Fund I and are to be sold through Merrill Lynch.

Who is selling the IRON shares in this Form 144 notice?

The planned sale is for the account of Atlas Venture Opportunity Fund I. The notice clarifies that information relates to this person and any others whose sales must be aggregated with it under Rule 144 paragraph (e).

How and when were the IRON shares being sold originally acquired?

The 26,552 shares covered by the notice were acquired on May 1, 2020 in a private placement from the issuer, Disc Medicine, Inc., for cash.

Which broker and market are involved in the planned IRON share sale?

The notice identifies Merrill Lynch as the broker and lists Nasdaq in connection with the common stock to be sold. The filing also references an intended sale date of September 2, 2026 for the covered securities information row.

What period does the Form 144 for IRON say it covers for prior sales?

The notice refers to prior activity by stating, “See attached Table II for sales of securities over the last three months,” indicating that additional recent sales information is provided in an attachment.

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

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Available on EDGAR 09/02/2026 - 04:46 PM EDT Accepted by SEC EDGAR 09/02/2026 - 04:45 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	26552	2088845.84	38392844	09/02/2026	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			26552	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	09/02/2026
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)