Japan · 
Who invested in Sosei?
Sosei's investors include Scottish Equity Partners, Mitsui Global Investment, JAFCO Japan, Japan Asia Investment and Yasuda Enterprise Development, and 2 more on record.
2004
$13MSeries B$52MRoundJapan · Funded startup
Who invested in Sosei
2 rounds we have observed, with the 7 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
$65Mraised across 2 rounds since 2003, from 2 sources
$13MSeries B$52MRound
- Latest round
- Round, $52MSept 2004
- Step-upi
- 4×
- Investors
- 7
The funding story
Each circle is a round, placed by date and sized by amount. The line above is the running total.
- First round
- Series B, $13M Aug 2003
- Biggest round
- $52M Round · Sept 2004
- Between rounds
- 13 months from the last two
The rounds
- Sept 2004
- Aug 2003Series B$13M6 new
Mitsui Global Investment- JAFCO Japan
Japan Asia Investment- Yasuda Enterprise Development
- Nomura Securities
Resona Capital
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.
Everyone who backed them
Missing a round, or an investor who was in one? Tell us.
Quick answers about Sosei
How much has Sosei raised?
Sosei has raised $65M across 2 rounds since 2003.
When did Sosei last raise?
Sosei's most recent round was an Undisclosed round of $52M in Sept 2004.
What was Sosei's biggest round?
Its most recent round, $52M in Sept 2004, is also its largest on record.
Who backed Sosei first?
Sosei's first round on record, in Aug 2003, was backed by Mitsui Global Investment, JAFCO Japan and Japan Asia Investment and 3 others.
What stage is Sosei at?
Sosei's latest named round is an Undisclosed round, in Sept 2004.
Where is Sosei based?
Sosei is based in Japan.
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