Here are the 424B prospectus supplements from SeaStar Medical Holding Corporation (ICU) in our archive over the last 12 months, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A 424B covers the supplement that carries the terms of a priced offering, so if you follow ICU and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full ICU filings page.
SeaStar Medical Holding Corporation registered 1,664,543 shares of Common Stock for resale by Lincoln Park Capital Fund, LLC under a resale prospectus; these shares are being offered for resale by the selling stockholder.
The resale is by Lincoln Park and the Company will receive no proceeds from those resales. The Company may, however, receive up to $14,657,887.43 aggregate gross proceeds (in addition to $342,112.57 previously received) under the April 25, 2025 Purchase Agreement if it elects to sell shares to Lincoln Park. As of April 20, 2026, SeaStar had 3,997,002 shares outstanding and Lincoln Park’s purchases are subject to a 4.99% beneficial ownership cap (which Lincoln Park may increase to 9.99% with 61 days’ notice).
SeaStar Medical Holding Corporation is registering the offer and sale of up to $1,901,000 of its common stock under an at-the-market program with H.C. Wainwright & Co. acting as sales agent. The company previously established an ATM facility with an aggregate offering price of $2,279,989, of which $1,170,258 of common stock had been sold as of November 6, 2025. This supplement amends the prior prospectus to align the maximum amount that may be sold with the limits of General Instruction I.B.6 of Form S-3, which currently permits offerings up to an aggregate price of $1,901,390. SeaStar’s public float held by non-affiliates is stated as $44,394,521, based on 35,802,033 shares at $1.24 per share, and the company notes it has sold $12,896,813 of common stock under these I.B.6 limits over the prior 12-month period.