What stage does Saisei Ventures invest at?

Saisei Ventures invests at the Pre-Seed, Seed, Series A, Series B, Series C, Growth stages.

What sectors does Saisei Ventures focus on?

Saisei Ventures focuses on Biotech, Healthtech, Medical Devices, Sector Agnostic.

Where is Saisei Ventures located?

Saisei Ventures is headquartered in Cambridge, US.

Saisei Ventures

Venture capital

Cambridge · Pre-Seed–Growth · 8 people tracked

Also known as Saisei Ventures LLC

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Investment thesis

Saisei Ventures focuses on the Japanese biotech ecosystem, creating and backing ventures that translate pioneering Japanese research into globally competitive companies. It pairs cutting-edge science with global business and development experience, working alongside scientists, industry experts, and entrepreneurs. The firm targets advanced therapeutic platforms such as cell immunotherapies, pluripotent cell replacement therapies, and in vivo/ex vivo gene therapies, prioritizing programs with a realistic path to clinical and commercial-scale manufacturing and from proof-of-concept to IND. Although indication-agnostic, it concentrates on serious, life-threatening or debilitating diseases, sourcing technologies from a broad global network with a particular emphasis on Japan.

Invests inBiotech Healthtech Medical DevicesSector AgnosticAsia-Pacific Cambridge Global Japan United States

Source: firm website, verified Aug 3, 2026.

Stage

Pre-Seed–Growth

Cambridge, Massachusetts, US

Instruments

Equity

Founded

2020

Team · 8 people

from curated & public directories

Hikaru Saito· Partner

h•••@saiseiventures.comreveal

Sven Kili· Partner· United Kingdomin

s•••@saiseiventures.comreveal

Hikaru Saito· Partner· Palo Alto, Californiain 𝕏

Hikaru Saito is a Partner at Saisei Ventures with a background spanning academic research and pharmaceutical development. He earned a Ph.D. focusing on multidrug resistance in anti-tumor agents, collaborated on patented compound screening with Nihon Chemiphar, and spent six years as a scientist at Astellas developing small molecule formulations and biologics. He subsequently transitioned to business development and venture capital, serving at Astellas Venture Management in Silicon Valley where he evaluated opportunities across RNA, cell, and gene therapy, led deal processes globally, and established partnerships with venture capital funds and research institutions.

Tomohiro Kobayashi· Partner· Japanin

t•••@angelbridge.jpreveal

Jonathan Yeh· Managing Partner

j•••@saiseiventures.comreveal

Sonny Dhawan· Associate· Indiain

s•••@saiseiventures.comreveal

Yusuke Wada· Senior Associate· Tokyo, Japanin

y•••@saiseiventures.comreveal

Ryosuke Yao· Senior Associate· Tokyo, Japanin

r•••@angelbridge.jpreveal

Frequently asked questions

What stage does Saisei Ventures invest at?: Saisei Ventures invests at the Pre-Seed, Seed, Series A, Series B, Series C, Growth stages.
What sectors does Saisei Ventures focus on?: Saisei Ventures focuses on Biotech, Healthtech, Medical Devices, Sector Agnostic.
Where is Saisei Ventures located?: Saisei Ventures is headquartered in Cambridge, US.

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