United States · Who invested in Isilon Systems?
Isilon Systems's investors include Atlas Venture, Madrona Venture Group, Sequoia Capital, GGV Capital and Lehman Brothers, and 1 more on record.
200120022003200420052006
$8.4MSeries A$15MSeries B$20MVenture?Series CUnited States · Series C startup
Who invested in Isilon Systems
4 rounds we have observed, with the 6 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.
Funding summaryUpdated 26 Oct 2026
$43Mraised across 4 rounds since 2001, from 4 sources
$8.4MSeries A$15MSeries B$20MVenture
- Latest round
- Series CJul 2006
- Biggest round
- $20MVenture · May 2005
- Investors
- 6
The funding story
Each circle is a round, placed by date and sized by amount. The line above is the running total.
- First round
- Series A, $8.4M Apr 2001
- Biggest round
- $20M Venture · May 2005
- Usual gap between rounds
- 15 months the median of 3
The rounds
- Jul 2006
- May 2005Venture$20M3 new2 returning
From a historical funding record
- Jul 2002
- Apr 2001
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 A2001Series B2002Venture2005Series C2006
Atlas Venture
Madrona Venture Group
Sequoia Capital
GGV Capital
Lehman Brothers
Focus Ventures
Atlas VentureMadrona Venture GroupSequoia CapitalGGV CapitalLehman BrothersFocus VenturesThe exit
ExitBuyerPriceWhen
From historical deal records. Wrong? Tell us.
Everyone who backed them
Missing a round, or an investor who was in one? Tell us.
Quick answers about Isilon Systems
How much has Isilon Systems raised?
Isilon Systems has raised $43M across 4 rounds since 2001. One round did not disclose an amount, so the total is a floor.
When did Isilon Systems last raise?
Isilon Systems's most recent round was a Series C in Jul 2006.
What was Isilon Systems's biggest round?
Isilon Systems's largest round on record is $20M (Venture), in May 2005.
Who backed Isilon Systems first?
Isilon Systems's first round on record, in Apr 2001, was backed by Atlas Venture and Madrona Venture Group.
What stage is Isilon Systems at?
Isilon Systems's latest named round is a Series C, in Jul 2006.
Where is Isilon Systems based?
Isilon Systems is based in the United States.
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