15th Rock is a Tokyo-based venture capital firm focused on Human Augmentation (primarily hardware) and Consumer 3.0 (primarily software), investing from seed to pre-IPO stages across Japan and the United States.
Average disclosed round size is $104.4M (across 11 rounds with reported amounts).
Portfolio
12
Fund Size
—
Top Stage
Seed
Last 12 Mo
0
Team
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
16 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 LetzRyd | Seed | $4M | Jan 2026 |
 Onera | Series C | $30M | Jan 2024 |
 Onera Health | Series C | $32M | Jan 2024 |
 Bisu | Seed | $3.2M | Oct 2021 |
| Bisu | Seed | $3.2M | Jan 2021 |
 Sun Asterisk | Unknown | $1B | Jan 2020 |
| Onera | Series B | — | — |
 Cellid | Unknown | $13M | — |
 Onera Technologies B.V. | Series C | — | — |
| Onera Technologies B.V. | Series B | — | — |
 Proton Intelligence | Seed | $7.0M | — |
| PPacific Meta | Seed | $4.2M | — |
| JJIZAIE | Strategic | — | — |
 Bloomlife | Series A | $12.2M | — |
| Onera Health | Series B | — | — |
| 五五常・アンド・カンパニー | Series C | $40M | — |
Top Co-Investors
imec.xpand6 shared
Invest-NL6 shared
Innovation Industries6 shared
EQT Life Sciences3 shared
Gimv3 shared
SOSV3 shared
e2vc2 shared
Dimension2 shared
SMBC Venture Capital2 shared
Development Bank of Japan Inc.1 shared
Global Brain Corporation1 shared
India Quotient1 shared
JIF Capital1 shared
QUAD Investment Management1 shared
HAX1 shared
We Venture Capital1 shared
Exor Ventures1 shared
Tenmile1 shared
LongeVC1 shared
Last updated: 20 October 2026