Siiibo
Siiibo is a fintech company in Tokyo, Japan, founded in 2019. It has raised $14.1M across 4 rounds, most recently a $6.0M Venture Round in April 2025.
Siiibo証券（シーボ）｜金利2〜8%の円建て国内債券投資
- Headquarters
- Tokyo
- Employees
- 11–50
- Founded
- 2019
- Business Model
- Marketplace
- Website
- siiibo.com
- Total Funding
- $14.1M
- Last Round
- $6.0M Venture RoundApr 2025
- Rounds
- 4
Totals include recorded grants and other qualifying funding, not just equity. What counts toward funding.
Indexed holds 4 funding rounds and 3 investors for this company. The full record is or through the API.
About
Siiibo (now operating as Metaplanet Securities / シーボ証券) is a specialized online securities firm in Japan that creates a direct marketplace between corporate bond issuers and individual investors. The platform focuses on middle-to-late stage unlisted startups and growth companies, offering corporate bonds with interest rates of 2–8% and investment minimums starting around JPY 500,000. Siiibo differentiates from social lending platforms by issuing regulated securities-grade bonds enabling secondary market trading, and provides investors with detailed IR information and ongoing company monitoring during the bond holding period. The firm holds a Type 1 Financial Instruments Business registration under Japan's Financial Instruments and Exchange Act.
Summary
It lists 11–50 employees. It has raised $14.1M in total across 4 rounds, most recently a $6.0M Venture Round in Apr 2025. Investors include 15th Rock, Aozora Corporate Investment and Pacific Bays Capital.
Tech & App Stack
3 technologies & apps tracked
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Funding History
Apr 2025
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Funding: Series A through Venture Round. Amounts, valuations, and investors where available.
Investors
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