United States · 
Who invested in StumbleUpon?
StumbleUpon's investors include First Round Capital, Accel, August Capital, Sherpalo Ventures and Garrett Camp, and 6 more on record.
200120032005200720092011
?Seed$1.5MSeed?Series A$17MSeries BUnited States · Series B startup
Who invested in StumbleUpon
4 rounds we have observed, with the 11 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
$19Mraised across 4 rounds since 2001, from 4 sources
$1.5MSeed$17MSeries B
- Latest round
- Series B, $17MMar 2011
- Step-upi
- 11.3×
- Investors
- 11
The funding story
Each circle is a round, placed by date and sized by amount. The line above is the running total.
- First round
- Seed Jan 2001
- Biggest round
- $17M Series B · Mar 2011
- Usual gap between rounds
- 3.3 years the median of 3
The rounds
- Mar 2011Series B$17M1 new5 returning
Reported by techcrunch.com
- Apr 2009Series AAmount undisclosed5 new1 returning
Reported by google.com
- Dec 2005
- Jan 2001SeedAmount undisclosed1 new
- Brad O'Neill
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.
Seed2001Seed2005Series A2009Series B2011
First Round Capital
Accel
August Capital
Sherpalo Ventures
Garrett Camp
SV Angel
DAG VenturesRon ConwayMitch KaporRam Shriram
First Round CapitalAccelAugust CapitalSherpalo VenturesGarrett CampSV AngelDAG VenturesRon ConwayMitch KaporRam ShriramExits
From historical deal records. Wrong? Tell us.
Everyone who backed them
Ron ConwayAngel1round
Mitch KaporAngel1round
Ram ShriramVC firm1round
Brad O'Neillno record of our own yet1round
Missing a round, or an investor who was in one? Tell us.
Also claim to have backed them
These 3 firms list StumbleUpon as a portfolio company on their own websites, but no report of a round names them. They are the firms' own claims, kept apart from the rounds above.
Quick answers about StumbleUpon
How much has StumbleUpon raised?
StumbleUpon has raised $19M across 4 rounds since 2001. 2 rounds did not disclose an amount, so the total is a floor.
When did StumbleUpon last raise?
StumbleUpon's most recent round was a Series B of $17M in Mar 2011.
What was StumbleUpon's biggest round?
Its most recent round, $17M in Mar 2011, is also its largest on record.
Who backed StumbleUpon first?
StumbleUpon's first round on record, in Jan 2001, was backed by Brad O'Neill.
What stage is StumbleUpon at?
StumbleUpon's latest named round is a Series B, in Mar 2011.
Where is StumbleUpon based?
StumbleUpon is based in the United States.
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