United States · Venture startup

Who invested in Cast Iron Systems

6 rounds we have observed, with the 8 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

$53Mraised across 6 rounds since 2003, from 6 sources

$8.3MVenture$12MSeries C$14MSeries D$17MSeries F$2.5MVenture
Latest round
Venture, $2.5MAug 2009
Biggest round
$17MSeries F · Jul 2007
Investors
8
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.

200420052006200720082009
$8.3MVenture$12MSeries C$14MSeries D?Series E$17MSeries F$2.5MVenture
First round
Venture, $8.3M
Jul 2003
Biggest round
$17M
Series F · Jul 2007
Usual gap between rounds
14 months
the median of 5

The rounds

  1. Aug 2009
    Venture$2.5M

    No investor was named in the report.

    From a historical funding recordSEC filing: $2.5M sold, first sale Aug 2009

  2. Jul 2007
    Series F$17M5 returning

    From a historical funding record

  3. May 2006
    Series EAmount undisclosed2 new4 returning

    From a historical funding record

  4. Mar 2005
    Series D$14M3 new3 returning

    From a historical funding record

  5. Jan 2004
    Series C$12M1 new

    From a historical funding record

  6. Jul 2003
    Venture$8.3M2 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.

Venture2003Series C2004Series D2005Series E2006Series F2007Venture2009Sequoia CapitalNorwest Venture PartnersInvesco PerpetualInvesco Private CapitalLehman Brothers Venture PartnersEvercore PartnersArtis Ventures (AV)ITOCHU Technology Ventures

The exit

ExitBuyerPriceWhen
AcquiredIBM (International Business Machines)$190MMay 2010

From historical deal records. Wrong? Tell us.

Everyone who backed them

Sequoia CapitalVC firm4rounds
Norwest Venture PartnersVC firm4rounds
Invesco PerpetualGrowth equity3rounds
Invesco Private CapitalVC firm3rounds
Lehman Brothers Venture PartnersVC firm2rounds
Evercore PartnersInvestment bank2rounds
Artis Ventures (AV)VC firm1round
ITOCHU Technology VenturesVC firm1round

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

Quick answers about Cast Iron Systems

Who invested in Cast Iron Systems?

Cast Iron Systems's investors include Sequoia Capital, Norwest Venture Partners, Invesco Perpetual, Invesco Private Capital and Lehman Brothers Venture Partners, and 3 more on record.

How much has Cast Iron Systems raised?

Cast Iron Systems has raised $53M across 6 rounds since 2003. One round did not disclose an amount, so the total is a floor.

When did Cast Iron Systems last raise?

Cast Iron Systems's most recent round was a Venture of $2.5M in Aug 2009.

What was Cast Iron Systems's biggest round?

Cast Iron Systems's largest round on record is $17M (Series F), in Jul 2007.

Who backed Cast Iron Systems first?

Cast Iron Systems's first round on record, in Jul 2003, was backed by Sequoia Capital and Norwest Venture Partners.

What stage is Cast Iron Systems at?

Cast Iron Systems's latest named round is a Venture, in Aug 2009.

Where is Cast Iron Systems based?

Cast Iron Systems is based in the United States.

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