United States · Series F startup

Who invested in Castle Biosciences

9 rounds we have observed, with the 5 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

$36Mraised across 9 rounds since 2009, from 9 sources

$936KVenture$1.1MVenture$1.3MVenture$1.5MVenture$1.0MVenture$1.0MVenture$12MVenture$6.0MDebt$12MSeries F
Latest round
Series F, $12MJul 2015
Biggest round
$12MVenture · Aug 2014
Step-upi
1.9×
Investors
5
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.

2009201020112012201320142015
$936KVenture$1.1MVenture$1.3MVenture$1.5MVenture$1.0MVenture$1.0MVenture$12MVenture$6.0MDebt$12MSeries F
First round
Venture, $936K
Mar 2009
Biggest round
$12M
Venture · Aug 2014
Usual gap between rounds
7 months
the median of 8

The rounds

  1. Jul 2015
    Series F$12M1 new1 returning

    From a historical funding recordSEC filing: $12M sold, first sale Jul 2015

  2. Apr 2015
    Debt$6.0M1 new

    From a historical funding recordSEC filing: $12M sold, first sale Jul 2015

  3. Aug 2014
    Venture$12M3 new

    From a historical funding recordSEC filing: $7.5M sold, first sale Aug 2014

  4. May 2014
    Venture$1.0M

    No investor was named in the report.

    From a historical funding recordSEC filing: $1.0M sold, first sale Apr 2014

  5. Nov 2013
    Venture$1.0M

    No investor was named in the report.

    Reported by sec.govSEC filing: $1.0M sold, first sale Nov 2013

  6. May 2013
    Venture$1.5M

    No investor was named in the report.

    Reported by sec.govSEC filing: $1.5M sold, first sale May 2013

  7. Oct 2012
    Venture$1.3M

    No investor was named in the report.

    Reported by sec.govSEC filing: $1.3M sold, first sale Sept 2012

  8. Mar 2010
    Venture$1.1M

    No investor was named in the report.

    Reported by sec.govSEC filing: $1.1M sold, first sale Mar 2010

  9. Mar 2009
    Venture$936K

    No investor was named in the report.

    From a historical funding recordSEC filing: $936K sold, first sale Sept 2008

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.

Venture2010Venture2012Venture2013Venture2013Venture2014Venture2014Debt2015Series F2015HealthQuest CapitalSVB CapitalIndustry VenturesMountain Group PartnersLongfellow Venture Partners

Everyone who backed them

HealthQuest CapitalGrowth equity2rounds
SVB CapitalVC firm1round
Industry VenturesVC firm1round
Mountain Group PartnersVC firm1round
Longfellow Venture Partnersno record of our own yet1round

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

Quick answers about Castle Biosciences

Who invested in Castle Biosciences?

Castle Biosciences's investors include HealthQuest Capital, SVB Capital, Industry Ventures, Mountain Group Partners and Longfellow Venture Partners.

How much has Castle Biosciences raised?

Castle Biosciences has raised $36M across 9 rounds since 2009.

When did Castle Biosciences last raise?

Castle Biosciences's most recent round was a Series F of $12M in Jul 2015.

What was Castle Biosciences's biggest round?

Castle Biosciences's largest round on record is $12M (Venture), in Aug 2014.

Who backed Castle Biosciences first?

Castle Biosciences's first round on record, in Aug 2014, was backed by Mountain Group Partners, HealthQuest Capital and Longfellow Venture Partners.

What stage is Castle Biosciences at?

Castle Biosciences's latest named round is a Series F, in Jul 2015.

Where is Castle Biosciences based?

Castle Biosciences is based in the United States.

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