# Siiibo Securities Co.

Startup profile on Capital Atlas: https://capitalatlas.ai/startups/siiibo-securities-co

- Industry: Financial Services
- Headquarters: Tokyo, Japan
- Website: www.siiibo.com
- Total disclosed funding: $8.5M
- Latest round: Series B (Dec 24, 2021)
- Investors on record: 8

## About

Based in Japan, Siiibo Securities Co., Ltd. specializes in facilitating domestic bond investments, focusing on offering innovative financing solutions for startups and providing investors with accessible opportunities in the bond market.Siiibo Securities Co., Ltd. was founded in 2019 and is headquartered in Tokyo, Japan. The company primarily engages in domestic bond investments, particularly focusing on corporate bonds. It has completed a total of 10 deals to date. The most recent funding round was a Series B round completed in April 2025, raising JPY 180.000 mn from investors including Relic Inc. The company has not undergone significant pivots or changes in business strategy and does not have known subsidiaries or a parent company.Siiibo Securities specializes in domestic bond investment, primarily focusing on corporate bonds that offer interest rates ranging from 2% to 8%. Their core offerings include a distinct platform for investing in bonds issued by promising startups in the middle to late stages of development, providing investors with opportunities to support innovative ventures. The company ensures total assistance for investors, making bonds a more accessible investment vehicle. Additionally, Siiibo Securities facilitates secondary market transactions for these corporate bonds, allowing for flexibility in trading and liquidity, targeting investors in Japan and beyond who seek to diversify their portfolios with alternative investment options in a regulated environment.Siiibo Securities generates revenue through the issuance and trading of corporate bonds, structured as individual investments ranging from approximately JPY 500,000 to JPY 3 million per bond. The transaction structure involves direct investments from individuals who meet specific criteria, including having over JPY 10 million in financial assets and at least one year of investment experience. The firm does not charge purchase fees for these bonds, streamlining the investment process for clients. By providing a transparent platform for investment in corporate bonds, Siiibo creates a direct connection between investors and the issuing companies, promoting a diversified investment approach while supporting the growth of startups through capital influx.In April 2025, Siiibo Securities Co., Ltd. secured additional financing from new investors including 15th Rock, FINOLAB, and Pacific Bays Capital, as well as existing investor Aozora Corporate Investment. This funding aims to expand the company's bond product offerings, support startup fundraising, and enhance Siiibo’s direct finance platform for both individual and corporate investors. The firm is focused on broadening its market reach and enhancing its product range, although specific new products and geographic regions for expansion have not been detailed.

## Funding rounds

- Series B, Dec 24, 2021, $4.9M — DNX Ventures, Angel Bridge, Chiba Dojo
- Series A, Jul 13, 2021, $1.1M — STRIVE, Chiba Dojo
- Series A, Mar 31, 2020, $2.1M — AG Capital, Digital Advertising Consortium, Chiba Dojo, Beta Venture Capital
- Angel, Jun 21, 2019, $0.4M — East Ventures

## Investors

- East Ventures (https://capitalatlas.ai/funds/east-ventures) — Angel
- AG Capital — Series A
- Digital Advertising Consortium — Series A
- Chiba Dojo (https://capitalatlas.ai/funds/chiba-dojo) — Series A, Series B
- Beta Venture Capital (https://capitalatlas.ai/funds/beta-venture-capital) — Series A
- STRIVE (https://capitalatlas.ai/funds/strive) — Series A
- DNX Ventures (https://capitalatlas.ai/funds/dnx-ventures) — Series B
- Angel Bridge (https://capitalatlas.ai/funds/angel-bridge) — Series B