Investors / United States / Saisei Ventures
Saisei Ventures
Venture capital · Cambridge, MA, United States · North America
Saisei Ventures is a venture capital firm focused on the Japanese biotechnology ecosystem, combining Western expertise with Japanese innovation. It works hands-on with portfolio companies, providing guidance and network connections to build globally competitive biotech companies.
Invests inHealthcare & Biotech
In its own wordsbiotechlife sciencestherapeuticscell therapygene therapyjapan
Your fit with Saisei Ventures
Four questions about your startup
See how your round matches what it backs, point by point.
Or find every investor that fitsSaisei Ventures lists 5 checked portfolio companies on its own site. Its largest theme is Healthcare & Biotech (100%). 60% of its companies are based in Japan. It invests most often alongside 1955 Capital, Aflac Ventures Japan and Axil Capital.
No funding round on record names Saisei Ventures yet, so the figures come from its portfolio page.
Investor profile
percentile among all firmsShow as a table
| Measure | Percentile of all firms | Value |
|---|---|---|
| Portfolio size | 4th | 5 companies |
| Recent activity | 46th | 0 rounds in 12 months |
| Early stage | 54th | 0% of entries at pre-seed or seed |
| Evidence | 52th | 0% of companies confirmed by a round |
| Sector focus | 100th | 100% in its largest sector |
| Reach | 42th | 2 countries |
Its portfolio companies
where they are based, and what their own sites showSite status
- Site answers5100%
- No longer answers00%
- Points to another company00%
- Parked or sold domain00%
A site that stops answering three checks in a row is counted as no longer answering; that is not proof of closure. A site that points to another company is often an acquisition.
Investment themes
share of its checked companiesThis firmAll checked companies
Show as a table
| This firm | All checked companies | |
|---|---|---|
| Healthcare & Biotech | 100% | 15% |
Co-investor network
who it backs companies with, and who they back togetherCompare Saisei Ventures head to head
portfolio size, rounds, entry stages, themes and the companies both backThree or more firms at once: portfolio overlap.
Portfolio
5 companies checked against their own sites| Company | What it does | Themes | First round with it | Evidence |
|---|---|---|---|---|
| Craif develops and provides cancer risk screening products and medical devices using bio-AI technology | Healthcare & Biotech | Portfolio page | ||
| CureApp develops medical treatment apps based on medical evidence to solve healthcare issues and provide high-quality treatment to all people. | Healthcare & Biotech | Portfolio page | ||
| Kenai Therapeutics is a clinical-stage biotechnology company that advances cell therapies and gene-modified medicines for the treatment of neurological conditions. | Healthcare & Biotech | Portfolio page | ||
| Tune Therapeutics develops genetic tuning technology to control gene activity and reverse cellular dysfunction and disease | Healthcare & Biotech | Portfolio page | ||
| United Immunity develops next-generation in vivo cell therapies using its Myeloid Targeting Platform technology to selectively target and program immune cells in the body for the treatment of various diseases. | Healthcare & Biotech | Portfolio page |
About this data
site last read 5 Nov 2026- Site
- saiseiventures.com
- Last read
- 5 Nov 2026
- Watching since
- 5 Nov 2026
- Companies checked
- 5
Rates come from what VCinfo has observed since observation_start. Firms tend to remove companies that closed, so early rates understate reality. A company leaving a portfolio page does not mean it closed or exited. An unreachable site means our checks failed, nothing more.
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