United States · Who invested in Affymax?
Affymax's investors include MPM Capital, Apax Partners, Sprout Group, Bear Stearns Health Innoventures L.P and Patricof & Co. Ventures.
2003200520072009
$51MVenture$20MSeries C$42MVentureUnited States · Venture startup
Who invested in Affymax
3 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
$113Mraised across 3 rounds since 2001, from 3 sources
$51MVenture$20MSeries C$42MVenture
- Latest round
- Venture, $42MMar 2009
- Biggest round
- $51MVenture · Jul 2001
- Step-upi
- 2.1×
- Investors
- 5
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, $51M Jul 2001
- Biggest round
- $51M Venture · Jul 2001
- Usual gap between rounds
- 4.9 years the median of 2
The rounds
- Mar 2009Venture$42M
No investor was named in the report.
From a historical funding recordSEC filing: $42M sold, first sale Mar 2009
- Apr 2004Series C$20M4 new
From a historical funding record
- Jul 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.
Venture2001Series C2004Venture2009
MPM Capital
Apax Partners
Sprout GroupBear Stearns Health Innoventures L.PPatricof & Co. Ventures
MPM CapitalApax PartnersSprout GroupBear Stearns Health Innoventures L.PPatricof & Co. VenturesEveryone who backed them
Bear Stearns Health Innoventures L.PVC firm1round
Patricof & Co. VenturesVC firm1round
Missing a round, or an investor who was in one? Tell us.
Quick answers about Affymax
How much has Affymax raised?
Affymax has raised $113M across 3 rounds since 2001.
When did Affymax last raise?
Affymax's most recent round was a Venture of $42M in Mar 2009.
What was Affymax's biggest round?
Affymax's largest round on record is $51M (Venture), in Jul 2001.
Who backed Affymax first?
Affymax's first round on record, in Jul 2001, was backed by Patricof & Co. Ventures.
What stage is Affymax at?
Affymax's latest named round is a Venture, in Mar 2009.
Where is Affymax based?
Affymax is based in the United States.
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