Disc Medicine CEO exercises options for 36K shares

Disc Medicine’s CEO exercised fully vested stock options for 36,000 shares, increasing his direct common share holdings to 262,064.

Rhea-AI Filing Summary

Disc Medicine, Inc. (IRON) reports that Chief Executive Officer and director John D. Quisel exercised options for 36,000 shares of common stock on September 15, 2026 at an exercise price of $1.01 per share. The underlying options were fully vested and exercisable, and he now directly holds 262,064 common shares and 150,120 option shares. No Rule 10b5-1 trading plan is reported for these transactions.

Insider Trade Summary

36,000 shares exercised/converted

Exercise 2 txns

Insider Quisel John D

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Exercise	Stock Option (Right to Buy) F1	36,000	$0.00	$0.00
Exercise	Common Stock	36,000	$1.01	$36K

Holdings After Transaction: Stock Option (Right to Buy) — 150,120 contracts (Direct); Common Stock — 262,064 shares (Direct)

Footnotes (1)

1. F1. The shares underlying this option are fully vested and exercisable as of the date hereof.

Key Figures

Options exercised: 36,000 shares Exercise price: $1.01 per share Common shares held after transaction: 262,064 shares +3 more

6 metrics

Options exercised 36,000 shares Stock options converted into common stock on September 15, 2026

Exercise price $1.01 per share Price paid to exercise 36,000 stock options into common stock

Common shares held after transaction 262,064 shares Direct common stock ownership by CEO John D. Quisel after the exercise

Remaining option shares 150,120 shares Option position reported following the option exercise

Option expiration date March 10, 2030 Expiration for the option grant from which 36,000 shares were exercised

Transaction date September 15, 2026 Date of the option exercise and resulting acquisition of common stock

Key Terms

stock option, common stock, exercise price

3 terms

stock option financial

"The filing reports the exercise of a stock option for 36,000 shares."

A stock option is a contract that gives you the right to buy or sell a company's stock at a specific price within a certain time frame. People use them to potentially make money if the stock's price moves favorably or to protect against losses. It's like holding a coupon that can be used to buy or sell stock at a set price later on.

common stock financial

"The options were exercised into shares of common stock held directly."

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

exercise price financial

"The exercise price for the option was $1.01 per share."

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

FAQ

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

What did Disc Medicine (IRON) disclose about its CEO’s recent equity transaction?

Disc Medicine disclosed that CEO John D. Quisel exercised options for 36,000 shares of common stock on September 15, 2026 at an exercise price of $1.01 per share, increasing his direct common share holdings to 262,064 shares.

How many Disc Medicine (IRON) shares does the CEO hold after the reported transaction?

After the reported transaction, CEO John D. Quisel directly holds 262,064 shares of common stock and 150,120 shares underlying stock options, according to the filing’s post-transaction ownership figures.

What type of transaction did the Disc Medicine (IRON) CEO report on September 15, 2026?

On September 15, 2026, CEO John D. Quisel reported an option exercise, converting 36,000 option shares into 36,000 shares of common stock at an exercise price of $1.01 per share.

Were the Disc Medicine (IRON) CEO’s options fully vested at the time of exercise?

Yes. A footnote states that the 36,000 option shares exercised by CEO John D. Quisel were fully vested and exercisable as of the transaction date.

Was a Rule 10b5-1 trading plan used for the Disc Medicine (IRON) CEO’s transaction?

No. The filing indicates that no Rule 10b5-1 trading plan was reported in connection with CEO John D. Quisel’s option exercise and related share acquisition.

What is the remaining option position of the Disc Medicine (IRON) CEO after this exercise?

After exercising options for 36,000 shares, CEO John D. Quisel has 150,120 shares remaining under stock options, with those options scheduled to expire on March 10, 2030.

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

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Available on EDGAR 09/16/2026 - 06:45 PM Accepted by SEC EDGAR 09/16/2026 - 06:44 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Quisel John D

(Last) (First) (Middle)

C/O DISC MEDICINE, INC.

321 ARSENAL STREET, SUITE 101

(Street)

WATERTOWN MASSACHUSETTS 02472

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Disc Medicine, Inc. [ IRON ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/15/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	09/15/2026		M		36,000	A	$1.01	262,064	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (Right to Buy)	$1.01	09/15/2026		M			36,000	(1)	03/10/2030	Common Stock	36,000	$0	150,120	D

Explanation of Responses:

1. The shares underlying this option are fully vested and exercisable as of the date hereof.

	By: /s/ Rahul Khara, as Attorney-in-Fact	09/16/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)