IRON Form 144: 10,000 Shares Proposed Sale

IRON notice of proposed sale: a Form 144 lists a proposed sale of 10,000 shares of Common Stock on 06/22/2026 tied to an exercise of stock options.

Rhea-AI Filing Summary

IRON notice of proposed sale: a Form 144 lists a proposed sale of 10,000 shares of Common Stock on 06/22/2026 tied to an exercise of stock options. The filing also discloses a 10b5-1 sale by Jonathan Yu of 18,612 shares on 06/16/2026 for $1,287,800.28.

Insights

Securities Compliance Analyst

Form 144 reports a planned sale after option exercise and a recent 10b5-1 sale.

The filing records a proposed sale of 10,000 shares on 06/22/2026

and reports a prior 10b5-1 disposition of 18,612 shares on 06/16/2026 yielding $1,287,800.28. These are routine insider sale disclosures; cash-flow treatment and purchaser details are not stated in the excerpt.

Key Figures

Proposed sale: 10,000 shares Prior 10b5-1 sale: 18,612 shares Proceeds reported: $1,287,800.28 +1 more

4 metrics

Proposed sale 10,000 shares scheduled 06/22/2026, exercise of stock options

Prior 10b5-1 sale 18,612 shares sold 06/16/2026 by Jonathan Yu

Proceeds reported $1,287,800.28 proceeds from 10b5-1 sale on 06/16/2026

Form date 06/22/2026 date listed for proposed sale

Key Terms

Form 144, 10b5-1, exercise of stock options

3 terms

Form 144 regulatory

"Filer Information | 144: Filer Information"

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.

10b5-1 regulatory

"10b5-1 Sales for JONATHAN YU"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

exercise of stock options financial

"Securities To Be Sold | Exercise of Stock Options"

FAQ

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

What does the IRON Form 144 report about shares being sold?

The Form 144 reports a proposed sale of 10,000 shares of Common Stock tied to an exercise of stock options scheduled for 06/22/2026. The filing lists the transaction method as cash.

Who conducted a recent 10b5-1 sale disclosed in the filing for IRON?

The filing shows a 10b5-1 sale by Jonathan Yu of 18,612 shares on 06/16/2026, with proceeds of $1,287,800.28 recorded in the excerpt.

When is the proposed option exercise sale for IRON scheduled?

The proposed exercise-and-sale is scheduled for 06/22/202610,000 shares to be sold following the exercise of stock options under the terms shown in the excerpt.

Which broker or financial services firm is listed on the Form 144?

The Form 144 lists Morgan Stanley Smith Barney LLC Executive Financial Services at 1 New York Plaza as the broker/dealer shown in the filing excerpt.

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

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Accepted by SEC EDGAR 06/22/2026 - 04:47 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	0001951849
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,Suite101 Watertown MASSACHUSETTS 02472
Phone	6176749274
Name of Person for Whose Account the Securities are To Be Sold	JONATHAN YU
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	Officer

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	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	10000	707900.00	38199089	06/22/2026	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	06/22/2026	Exercise of Stock Options	Issuer			10000	06/22/2026	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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for JONATHAN YU 321 Arsenal Street,Suite101 Watertown MA 02472	Common	06/16/2026	18612	1287800.28

144: Remarks and Signature

Remarks	The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale.
Date of Notice	06/22/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	03/17/2026
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	/s/ Jonathan Yu
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)