# SeaStar Medical funding: rounds and investors

> SeaStar Medical has raised $4.4M across 1 round since 2025. Investors include National Heart, Lung and Blood Institute. Every round with its source.

Source: https://millionrounds.com/company/seastar-medical (Millionrounds; every figure on the page links to its filing or article)

United States · [Funded startup](https://millionrounds.com/companies)

# Who invested in *SeaStar Medical*

One round we have observed, with the one investor named in it. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it.

Healthcare

Funding summary Updated 26 Oct 2026

**$4.4M** raised across 1 round since 2025, from 1 source

- **Latest round:** Round, $4.4M Jul 2025
- **Investors:** 1

See who backed them

## The rounds

- **Jul 2025** Round **$4.4M** [National Heart, Lung and Blood Institute](https://millionrounds.com/fund/national-heart-lung-and-blood-institute) Source recorded

## Founders and team

From SeaStar Medical's own website and the SEC filings it signed: 4 on the team.

- **Michael Messinger** Chief Financial Officer
- **Eric Schlorff** Executive Officer, Director i
- **Tim Varacek** Team
- **Tom Mullen** Team

## Everyone who backed them

[National Heart, Lung and Blood Institute](https://millionrounds.com/fund/national-heart-lung-and-blood-institute) VC firm **1** round

Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=seastar-medical).

## Also claim to have backed them

This firm lists SeaStar Medical as a portfolio company on their own website, but no report of a round names it. They are the firms' own claims, kept apart from the rounds above.

[Aphelion Capital](https://millionrounds.com/fund/aphelion-capital) VC firm Per its own site

## Quick answers about SeaStar Medical

### Who invested in SeaStar Medical?

SeaStar Medical's investors include National Heart, Lung and Blood Institute.

### How much has SeaStar Medical raised?

SeaStar Medical has raised $4.4M across 1 round since 2025.

### When did SeaStar Medical last raise?

SeaStar Medical's most recent round was an Undisclosed round of $4.4M in Jul 2025.

### What was SeaStar Medical's biggest round?

Its most recent round, $4.4M in Jul 2025, is also its largest on record.

### Who backed SeaStar Medical first?

SeaStar Medical's first round on record, in Jul 2025, was backed by National Heart, Lung and Blood Institute.

### What stage is SeaStar Medical at?

SeaStar Medical's latest named round is an Undisclosed round, in Jul 2025.

### Where is SeaStar Medical based?

SeaStar Medical is based in the United States.

## Companies like SeaStar Medical

In the same sector, and raised in the last eighteen months.

[**Star Therapeutics** $325M · Oct 2026](https://millionrounds.com/company/star-therapeutics)[**Promaxo** $106M · Oct 2026](https://millionrounds.com/company/promaxo)[**AI** $18M · Oct 2026](https://millionrounds.com/company/ai)[**Baba** $40M · Oct 2026](https://millionrounds.com/company/baba)[**Rejuvenate Bio** $13M · Oct 2026](https://millionrounds.com/company/rejuvenate-bio)[**Clinical Ink** $24M · Oct 2026](https://millionrounds.com/company/clinical-ink)

## Find investors like these

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