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ICU 424B3: Secondary offering

SeaStar Medical Holding Corporation

Filed with the SEC on · accession 0001213900-26-055905

ICU filed a 424B3 (prospectus (offering)) with the SEC on May 13, 2026. SeaStar Medical Holding Corporation filed a prospectus for the resale of up to 2,000,000 shares of common stock by Lincoln Park Capital Fund, LLC, pursuant to a purchase agreement dated April 25, 2025. The stock moved -5.0% by the first close after the filing.

Summary of the filing

SeaStar Medical Holding Corporation filed a prospectus for the resale of up to 2,000,000 shares of common stock by Lincoln Park Capital Fund, LLC, pursuant to a purchase agreement dated April 25, 2025. The company will not receive proceeds from the resale but may receive up to $14.66 million from future sales to Lincoln Park under the purchase agreement.

For details, click here →How to read a 424B3 →

Key details

Maximum shares offered for resale$2.0M
Potential gross proceeds from future sales to Lincoln Park$14.7M
Previous gross proceeds from sales to Lincoln Park$342K
IssuerSeaStar Medical Holding Corporation
Selling stockholderLincoln Park Capital Fund, LLC

How ICU stock reacted

Close before

$4.84

May 12, 2026

First close after

-4.96%

$4.60

5 trading days

-19.63%

$3.89

Since filing

-60.74%

$1.90

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Frequently asked questions

What did ICU file with the SEC on May 13, 2026?

ICU filed a 424B3 (Secondary offering). SeaStar Medical Holding Corporation filed a prospectus for the resale of up to 2,000,000 shares of common stock by Lincoln Park Capital Fund, LLC, pursuant to a purchase agreement dated April 25, 2025. The company will not receive proceeds from the resale but may receive up to $14.66 million from future sales to Lincoln Park under the purchase agreement.

What does a secondary offering mean for ICU stock?

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

How do I read a 424B3?

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 424B3 (prospectus (offering)): The final terms of an offering of shares or bonds.

How did ICU stock react to this filing?

ICU closed at $4.84 before the filing and $4.60 on May 13, 2026 (-4.96%). Five trading days later: $3.89 (-19.63%).

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