Disc Medicine holder proposes $912K share sale

Merrill Lynch is listed as broker for the proposed sale, which is valued at $911,635.6.

Rhea-AI Filing Summary

Disc Medicine, Inc. (IRON) shareholder Atlas Venture Opportunity Fund II reported a proposed sale of 11,470 common shares, with an aggregate market value of $911,635.6. Merrill Lynch is listed as broker, and October 21, 2026 is the approximate sale date. The notice lists 38,392,844 common shares outstanding and is signed by Ommer Chohan.

Key Figures

Proposed sale: 11,470 common shares Aggregate market value: $911,635.6 Common shares outstanding: 38,392,844 shares +1 more

4 metrics

Proposed sale 11,470 common shares Atlas Venture Opportunity Fund II

Aggregate market value $911,635.6 Proposed sale

Common shares outstanding 38,392,844 shares Disc Medicine

Approximate sale date October 21, 2026 Proposed sale

Key Terms

Rule 144, Private Placement, aggregated

3 terms

Rule 144 regulatory

"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

"Private Placement"

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.

aggregated regulatory

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

FAQ

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

How many IRON shares does Atlas Venture Opportunity Fund II propose to sell?

Atlas Venture Opportunity Fund II reported a proposed sale of 11,470 Disc Medicine common shares, with an aggregate market value of $911,635.6.

When is the proposed IRON share sale expected, and which broker is listed?

The approximate sale date is October 21, 2026, and Merrill Lynch is listed as broker.

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

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Available on EDGAR 10/21/2026 - 05:12 PM EDT Accepted by SEC EDGAR 10/21/2026 - 05:12 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	0001885327
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 II, 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	11470	911635.6	38392844	10/21/2026	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			11470	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	10/21/2026
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)