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IRON 424B5: Secondary offering

Filed with the SEC on · accession 0001193125-26-427982

IRON filed a 424B5 (prospectus (offering)) with the SEC on Oct 21, 2026. Disc Medicine, Inc. (IRON) is offering 6,000,000 shares of common stock at $75.00 per share, raising $450 million in gross proceeds ($423 million net before expenses). The stock moved -4.4% by the first close after the filing.

Summary of the filing

Disc Medicine, Inc. (IRON) is offering 6,000,000 shares of common stock at $75.00 per share, raising $450 million in gross proceeds ($423 million net before expenses). The underwriters have a 30-day option to purchase up to an additional 900,000 shares.

For details, click here →How to read a 424B5 →

Key details

Public offering price per share$75
Total gross proceeds$450.0M
Underwriting discounts and commissions per share$5
Total underwriting discounts and commissions$27.0M
Net proceeds before expenses$423.0M
Over-allotment option shares$900K
IssuerDisc Medicine, Inc.
Joint book-running managerJefferies
Joint book-running managerLeerink Partners
Joint book-running managerMorgan Stanley
Joint book-running managerCantor
Co-managerLifeSci Capital
Co-managerBMO Capital Markets
Co-managerH.C. Wainwright & Co.

How IRON stock reacted

Close before

$79.48

Oct 20, 2026

First close after

-4.38%

$76.00

5 trading days

+0.53%

$79.90

Since filing

-1.27%

$78.47

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Frequently asked questions

What did IRON file with the SEC on Oct 21, 2026?

IRON filed a 424B5 (Secondary offering). Disc Medicine, Inc. (IRON) is offering 6,000,000 shares of common stock at $75.00 per share, raising $450 million in gross proceeds ($423 million net before expenses). The underwriters have a 30-day option to purchase up to an additional 900,000 shares.

What does a secondary offering mean for IRON stock?

New shares dilute existing holders and are often sold at a discount to the market price.

How do I read a 424B5?

The final terms of an offering of shares or bonds. Look at price, number of shares and the discount to the market price. Large offerings dilute existing shareholders.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A 424B5 (prospectus (offering)): The final terms of an offering of shares or bonds.

How did IRON stock react to this filing?

IRON closed at $79.48 before the filing and $76.00 on Oct 21, 2026 (-4.38%). Five trading days later: $79.90 (+0.53%).

Other IRON SEC filings

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