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Femto Partners
Femto Partners is a private equity based in Tokyo, founded 2017; the Altss profile covers its classification, headquarters, registration, AUM band, and key...
Femto Partners
Femto Partners is a Tokyo-based independent firm that focuses on growth equity and venture capital strategies across Japan.
General information
Firm type
Private Equity
Year founded
2017
Location
Region
Asia
Country
Japan
City
Tokyo
Corporate office
東京都港区南青山一丁目1番1号 新青山ビル東館19階, Tokyo, Japan
Principals
磯崎 哲也
Founder & General Partner
曽我 悠平
General Partner
大久保 克彦
Managing Partner
Sector focus
Frequently asked questions
What is Femto's track record in Japanese VC performance benchmarks?
In December 2025, Femto ranked first in the 7th Domestic VC Performance Benchmark survey for the 2024 vintage year. The firm self-reported the ranking on its website. No independent verification of the underlying methodology or peer set is publicly available.
Who runs investment decisions at Femto Partners?
Founder and General Partner Tetsuya Isozaki leads the firm alongside General Partner Yuhei Soga and Managing Partner Katsuhiko Okubo. The eight-person team operates without a separate investment committee disclosed publicly; principals Isozaki and Soga appear as the primary decision-makers based on firm materials.
Profile maintained by Altss using OSINT (open-source intelligence), regulatory filings, licensed data partners, and verified direct submissions. Read the methodology. Last updated: . Continuous refresh with full update cycles at least every 30 days.
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