United States · Who invested in Ioxus?
Ioxus's investors include Braemar Energy Ventures, Aster, Northwater Capital, Energy Technology Ventures and Correlation Ventures, and 2 more on record.
2011201220132014
$12MVenture$21MSeries B$15MSeries C$21MSeries C
United States · Series C startup
Who invested in Ioxus
Funding summaryUpdated 26 Oct 2026
$69Mraised across 4 rounds since 2011, from 4 sources
$12MVenture$21MSeries B$15MSeries C$21MSeries C
- Latest round
- Series C, $21MApr 2014
- Step-upi
- 1.4×
- Investors
- 7
The funding story
Each circle is a round, placed by date and sized by amount. The line above is the running total.
- First round
- Venture, $12M Mar 2011
- Biggest round
- $21M Series C · Apr 2014
- Usual gap between rounds
- 9 months the median of 3
The rounds
- Apr 2014Series C$21M1 new
From a historical funding recordSEC filing: $21M sold, first sale Jul 2013
- Jul 2013Series C$15M2 new4 returning
Correlation Ventures
Braemar Energy Ventures
The Westly Group
Aster- Northwater Capital
- Energy Technology Ventures
Reported by finsmes.comSEC filing: $15M sold, first sale Jul 2013
- Apr 2011Series B$21M4 new
Reported by techcrunch.comSEC filing: $21M sold, first sale Feb 2011
- Mar 2011Venture$12M
No investor was named in the report.
Reported by gigaom.comSEC filing: $12M sold, first sale Feb 2011
Founders and team
From the SEC filings it signed: 2 on the team.
- Henry BarberExecutive Officeri
- Mark McGoughExecutive Officer, Directori
On the board, as filediFrank EganJames NorrodJoseph UrciuoliMark LittleRobert NardelliZachary Shulman
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.
Venture2011Series B2011Series C2013Series C2014Braemar Energy VenturesAsterNorthwater CapitalEnergy Technology VenturesCorrelation VenturesThe Westly Group
IFC InfraVentures
Braemar Energy VenturesAsterNorthwater CapitalEnergy Technology VenturesCorrelation VenturesThe Westly GroupIFC InfraVenturesEveryone who backed them
Northwater CapitalVC firm2rounds
Energy Technology VenturesCorporate VC2rounds
Missing a round, or an investor who was in one? Tell us.
Quick answers about Ioxus
How much has Ioxus raised?
Ioxus has raised $69M across 4 rounds since 2011.
When did Ioxus last raise?
Ioxus's most recent round was a Series C of $21M in Apr 2014.
What was Ioxus's biggest round?
Its most recent round, $21M in Apr 2014, is also its largest on record.
Who backed Ioxus first?
Ioxus's first round on record, in Apr 2011, was backed by Braemar Energy Ventures, Aster and Northwater Capital and 1 others.
What stage is Ioxus at?
Ioxus's latest named round is a Series C, in Apr 2014.
Where is Ioxus based?
Ioxus is based in the United States.
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