MC
Mitsui & Co
Mitsui & Co is a seed to Series C stage investment firm. It has made 13 investments. Average disclosed round size is $61.9M (across 12 rounds with reported amounts).
Portfolio
13
Fund Size
—
Top Stage
Unknown
Last 12 Mo
1
Team
MK
Masashi Kiyomine
Managing Director
PS
Paulina Szyzdek
Venture Partner
YI
Yuto Iizuka
Venture Partner
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
14 investments
| Company | Round | Amount | Date |
|---|---|---|---|
| VVast Space | Series A | $500M | Jan 2026 |
 EverSteel | Series A | $3M | Sep 2023 |
 Aktivolabs | Series A | $10M | Jan 2022 |
| KKomaza | Series B | $10M | Jan 2020 |
 Renoveru | Unknown | $11.8M | Apr 2017 |
| GGeekie | Series B | — | May 2015 |
| BBioAmber | Series B | $45M | May 2011 |
| BBioAmber | Unknown | $45M | Jan 2011 |
| BBoingo Wireless | Series C | $65M | Oct 2003 |
 Bearing AI | Seed | $7M | — |
| FFarmers Edge | Unknown | — | — |
 Bearing | Seed | $4.5M | — |
| OOptimus Technologies | Series A | $17.8M | — |
| HHANKUK CARBON | Unknown | $24M | — |
Top Co-Investors
Fund+2 shared
Hercules Capital, Inc.2 shared
Sofinnova Partners2 shared
Gaingels1 shared
Omidyar Network1 shared
Endeavor1 shared
Kleiner Perkins1 shared
Globis Capital Partners1 shared
DCM Ventures1 shared
Novastar Ventures1 shared
FMO1 shared
High Alpha1 shared
AZ-VC1 shared
Lightbank1 shared
SEEDS Capital1 shared
Adaptive Capital Partners1 shared
DigitalBridge1 shared
gener8tor1 shared
Q Capital Partners1 shared
Space Capital1 shared
Last updated: 8 September 2026