Disc Medicine holder to sell 2,810 shares

Atlas Venture Opportunity Fund I filed a Rule 144 notice to sell 2,810 IRON common shares previously acquired in a 2020 private placement.

Rhea-AI Filing Summary

Disc Medicine, Inc. (IRON) received a Rule 144 notice indicating that Atlas Venture Opportunity Fund I plans to sell common stock of the company. The notice covers 2,810 shares of common stock, with an aggregate market value of $224,940.50, to be sold through Merrill Lynch.

The shares relate to stock originally acquired on May 1, 2020 in a private placement for cash. At the time of the notice, Disc Medicine reports 38,392,844 shares of common stock outstanding. Additional recent sales by the same holder are referenced in an attached Table II.

Key Figures

Shares to be sold under Rule 144: 2,810 shares Aggregate market value of shares: $224,940.50 Shares outstanding: 38,392,844 shares +2 more

5 metrics

Shares to be sold under Rule 144 2,810 shares Common stock of Disc Medicine, Inc. covered by the notice

Aggregate market value of shares $224,940.50 Value of the 2,810 common shares to be sold

Shares outstanding 38,392,844 shares Common stock outstanding for Disc Medicine, Inc. as reported in the notice

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

Date of Rule 144 notice September 3, 2026 Date the Form 144 notice was signed and dated

Key Terms

Rule 144, private placement, aggregate market value, Form 144

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 ... | 2810 | 224940.5 | 38392844"

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.

Form 144 regulatory

"144: Securities To Be Sold"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

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 2,810 shares of Disc Medicine common stock under Rule 144. This is a notice of a potential resale by an existing holder, not an issuance of new shares by the company.

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

The notice covers 2,810 shares of Disc Medicine, Inc. common stock. The filing also notes an aggregate market value of $224,940.50 for the securities covered by the planned sale.

What is the aggregate market value of the IRON shares in this Form 144?

The Form 144 lists an aggregate market value of $224,940.50 for the 2,810 common shares of Disc Medicine, Inc. that Atlas Venture Opportunity Fund I plans to sell through Merrill Lynch.

How many Disc Medicine (IRON) shares were outstanding at the time of the notice?

The filing reports that Disc Medicine, Inc. had 38,392,844 shares of common stock outstanding when the Rule 144 notice was filed. This figure provides context for the relative size of the 2,810-share planned sale.

When and how were the IRON shares being sold under Rule 144 originally acquired?

The shares were originally acquired on May 1, 2020 in a private placement from Disc Medicine, Inc. for cash. The current Form 144 filing relates to the potential resale of these previously acquired shares.

Who is the broker for the planned Rule 144 sale of IRON shares?

The Form 144 lists Merrill Lynch, located at One Bryant Park in New York, as the broker for the planned sale of 2,810 Disc Medicine common shares under Rule 144 on the Nasdaq market.

When was the Rule 144 notice for Disc Medicine (IRON) filed?

The Form 144 notice is dated September 3, 2026. It also references additional sales of securities over the prior three months, which are described in an attached Table II not included here.

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

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Available on EDGAR 09/03/2026 - 05:37 PM EDT Accepted by SEC EDGAR 09/03/2026 - 05:08 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	2810	224940.5	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			2810	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)