Disc Medicine insider plans $2.6M stock sale

Disc Medicine insider John Quisel filed a notice to sell up to 33,000 shares of common stock, to be sold through Morgan Stanley Smith Barney LLC on NASDAQ.

Rhea-AI Filing Summary

Disc Medicine insider John Quisel filed a notice to sell up to 33,000 shares of common stock, to be sold through Morgan Stanley Smith Barney LLC on NASDAQ. The shares relate to an exercise of stock options for cash on 08/17/2026. As context, 38,392,844 common shares were outstanding as of 08/17/2026; this is a baseline figure, not the amount being sold. Over the past three months, Quisel previously sold 33,000 shares on 07/13/2026 and 34,000 shares on 06/18/2026 under a Rule 10b5-1 trading plan.

Key Figures

Shares proposed for sale: 33,000 shares Aggregate value of proposed sale: $2,601,720.00 Shares outstanding: 38,392,844 shares +3 more

6 metrics

Shares proposed for sale 33,000 shares Common stock to be sold via Morgan Stanley Smith Barney LLC

Aggregate value of proposed sale $2,601,720.00 Value associated with 33,000 shares of common stock

Shares outstanding 38,392,844 shares Common shares outstanding as of 08/17/2026

Prior 10b5-1 sale 1 33,000 shares; $2,473,779.48 Sale of common stock on 07/13/2026

Prior 10b5-1 sale 2 34,000 shares; $2,387,296.40 Sale of common stock on 06/18/2026

Option exercise date 08/17/2026 Exercise of stock options for cash linked to proposed sale

Key Terms

Form 144, Rule 10b5-1, Exercise of Stock Options, aggregate value

4 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.

Rule 10b5-1 regulatory

"10b5-1 Sales for JOHN QUISEL 321 Arsenal Street"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

Exercise of Stock Options financial

"Common | 08/17/2026 | Exercise of Stock Options | Issuer"

aggregate value financial

"Common | Morgan Stanley Smith Barney LLC Executive"

FAQ

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

What does Disc Medicine (IRON) report in this Form 144 filing?

The filing reports that John Quisel plans to sell up to 33,000 shares of Disc Medicine common stock. The sale is in connection with an exercise of stock options for cash on 08/17/2026 through Morgan Stanley Smith Barney LLC.

How many Disc Medicine (IRON) shares are proposed for sale and on which market?

The notice covers a proposed sale of 33,000 common shares of Disc Medicine. These shares are to be sold through Morgan Stanley Smith Barney LLC on the NASDAQ market, with an indicated aggregate value of $2,601,720.00 for the proposed transaction.

What prior Rule 10b5-1 sales by John Quisel in IRON stock are disclosed?

The filing lists two prior Rule 10b5-1 sales of Disc Medicine common stock: 33,000 shares sold on 07/13/2026 for $2,473,779.48 and 34,000 shares sold on 06/18/2026 for $2,387,296.40 during the past three months.

What is the outstanding share count for Disc Medicine (IRON) mentioned here?

The filing states that Disc Medicine had 38,392,844 common shares outstanding as of 08/17/2026. This figure provides context for the company’s equity base and is separate from the 33,000 shares covered by the proposed sale notice.

How is the Disc Medicine (IRON) stock sale linked to stock options?

The proposed sale of 33,000 shares is tied to an exercise of stock options dated 08/17/2026. The exercise is designated as for cash, meaning the options are being exercised with a cash payment, and the resulting shares may then be sold under this notice.

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

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Accepted by SEC EDGAR 08/17/2026 - 04:31 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	0001586788
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	6176749274
Name of Person for Whose Account the Securities are To Be Sold	JOHN QUISEL
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	Director
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	33000	2601720.00	38392844	08/17/2026	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	08/17/2026	Exercise of Stock Options	Issuer			33000	08/17/2026	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 JOHN QUISEL 321 Arsenal Street, Suite 101 Watertown MA 02472	Common	07/13/2026	33000	2473779.48
10b5-1 Sales for JOHN QUISEL 321 Arsenal Street, Suite 101 Watertown MA 02472	Common	06/18/2026	34000	2387296.40

144: Remarks and Signature

Remarks
Date of Notice	08/17/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	03/12/2026
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/ John Quisel
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)