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OSTX 424B5: Secondary offering

OS Therapies Inc.

Filed with the SEC on · accession 0001213900-26-092627

OSTX filed a 424B5 (prospectus (offering)) with the SEC on Aug 21, 2026. The final terms of an offering of shares or bonds. The stock moved +0.6% by the first close after the filing.

Summary of the filing

OS Therapies Inc. filed a prospectus supplement to offer up to $75 million of its common stock in an at-the-market offering through Jefferies LLC as sales agent.

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

Key details

Maximum aggregate offering price$75.0M
Sales agent compensation rate$3
IssuerOS Therapies Inc.
Sales agent/underwriterJefferies LLC

How OSTX stock reacted

Close before

$1.58

Aug 20, 2026

First close after

+0.63%

$1.59

5 trading days

+6.33%

$1.68

Since filing

-43.67%

$0.89

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Frequently asked questions

What did OSTX file with the SEC on Aug 21, 2026?

OSTX filed a 424B5 (Secondary offering). OS Therapies Inc. filed a prospectus supplement to offer up to $75 million of its common stock in an at-the-market offering through Jefferies LLC as sales agent.

What does a secondary offering mean for OSTX 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 OSTX stock react to this filing?

OSTX closed at $1.58 before the filing and $1.59 on Aug 21, 2026 (+0.63%). Five trading days later: $1.68 (+6.33%).

Other OSTX SEC filings

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