Who invested in Ikaria

3 rounds we have observed, with the 3 investors named in them. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it.

Internet

Funding summaryUpdated 26 Oct 2026

$345Mraised across 3 rounds since 2005, from 3 sources

$10MSeries A$280MSeries B$55MVenture

Latest round: Venture, $55MOct 2009
Biggest round: $280MSeries B · Mar 2007
Investors: 3

See who backed them

The funding story

Each circle is a round, placed by date and sized by amount. The line above is the running total.

2006200720082009

$10MSeries A$280MSeries B$55MVenture

First round: Series A, $10M
Biggest round: $280M
Usual gap between rounds: 2.6 years

The rounds

Oct 2009
Venture$55M
No investor was named in the report.
From a historical funding recordSEC filing: $55M sold, first sale Jul 2008
Mar 2007
Series B$280M1 returning
- Venrock
From a historical funding record
Apr 2005
Series A$10M3 new
From a historical funding record

Who was in which round

The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led.

Series A2005Series B2007Venture2009

Venrock

ARCH Venture Partners

5AM Ventures

The exit

ExitBuyerPriceWhen

AcquiredMallinckrodt$2.3BMar 2015

From historical deal records. Wrong? Tell us.

Everyone who backed them

VenrockVC firm2rounds

ARCH Venture PartnersVC firm1round

5AM VenturesVC firm1round

Missing a round, or an investor who was in one? Tell us.

Also claim to have backed them

This firm lists Ikaria 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.