United States · Series E startup

Who invested in Aileron Therapeutics

7 rounds we have observed, with the 9 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

$140Mraised across 7 rounds since 2006, from 7 sources

$7.0MSeries A$7.0MSeries B$11MSeries B$40MSeries D$12MSeries D$30MSeries E$33MSeries E
Latest round
Series E, $33MOct 2014
Biggest round
$40MSeries D · Jun 2009
Investors
9
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.

2008201020122014
$7.0MSeries A$7.0MSeries B$11MSeries B$40MSeries D$12MSeries D$30MSeries E$33MSeries E
First round
Series A, $7.0M
Dec 2006
Biggest round
$40M
Series D · Jun 2009
Usual gap between rounds
11 months
the median of 6

The rounds

  1. Oct 2014
    Series E$33M2 new5 returning

    From a historical funding recordSEC filing: $20M sold, first sale Oct 2014

  2. Nov 2013
    Series E$30M6 returning

    Reported by finsmes.comSEC filing: $15M sold, first sale Nov 2013

  3. Jan 2013
    Series D$12M6 returning

    Reported by finsmes.com

  4. Jun 2009
    Series D$40M5 new2 returning

    Reported by zibb.comSEC filing: $28M sold, first sale May 2009

  5. Apr 2008
    Series B$11M2 returning

    Reported by boston.bizjournals.com

  6. Jun 2007
    Series B$7.0M2 returning

    From a historical funding record

  7. Dec 2006
    Series A$7.0M2 new

    Reported by fiercebiotech.com

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 A2006Series B2007Series B2008Series D2009Series D2013Series E2013Series E2014Novartis Venture FundApple Tree PartnersSR OneRoche Venture FundExcel Venture ManagementLilly VenturesAju IB InvestmentLilly VenturesExcel Medical Ventures

Everyone who backed them

Novartis Venture FundCorporate VC7rounds
Apple Tree PartnersVC firm7rounds
SR OneCorporate VC4rounds
Roche Venture FundCorporate VC4rounds
Excel Venture ManagementVC firm4rounds
Lilly VenturesCorporate VC3rounds
Aju IB InvestmentVC firm1round
Lilly VenturesGrowth equity1round
Excel Medical VenturesGrowth equity1round

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

Quick answers about Aileron Therapeutics

Who invested in Aileron Therapeutics?

Aileron Therapeutics's investors include Novartis Venture Fund, Apple Tree Partners, SR One, Roche Venture Fund and Excel Venture Management, and 4 more on record.

How much has Aileron Therapeutics raised?

Aileron Therapeutics has raised $140M across 7 rounds since 2006.

When did Aileron Therapeutics last raise?

Aileron Therapeutics's most recent round was a Series E of $33M in Oct 2014.

What was Aileron Therapeutics's biggest round?

Aileron Therapeutics's largest round on record is $40M (Series D), in Jun 2009.

Who backed Aileron Therapeutics first?

Aileron Therapeutics's first round on record, in Dec 2006, was backed by Novartis Venture Fund and Apple Tree Partners.

What stage is Aileron Therapeutics at?

Aileron Therapeutics's latest named round is a Series E, in Oct 2014.

Where is Aileron Therapeutics based?

Aileron Therapeutics is based in the United States.

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