Siiibo
Siiibo Securities operates Japan's Type I-licensed online platform for retail-accessible private placement corporate bonds, using a reverse-inquiry matching engine and a proprietary secondary market to connect mid-to-late-stage startups and unlisted companies with affluent individual investors seeking 2–8%+ yen interest income.
- Company typePrivate
- Founded2019
- HeadquartersTokyo, Japan
- Headcount11–50
- GTM typeB2B
- OfferingServices
What Siiibo does
Siiibo Securities Co., Ltd. operates a self-serve online platform in Japan for the issuance, distribution, and secondary trading of private placement corporate bonds (私募社債) targeted at retail investors. Founded January 11, 2019 by Kazuki Komura and headquartered in Tokyo's FinGATE TERRACE, the company holds a Type I Financial Instruments Business Operator registration (Kanto Local Finance Bureau No. 3230) and is a member of the Japan Securities Dealers Association, allowing it to underwrite, solicit, and intermediate securities. Its product surface includes individual private placement bonds (¥500K–¥3M per unit, 1–4 year maturity, 2–8%+ yen interest), puttable bonds (定期換金債), convertible bonds (転換社債) via J-Ships, a proprietary secondary market (セカンダリーマーケット) providing pre-maturity liquidity, and the Omatome Bond (おまとめ債) repackaged product bundling 5–20 underlying bonds.
The technology layer is a full-lifecycle platform: IR disclosure publishing, investor onboarding via eKYC in ~3 minutes, a distinctive "reverse-inquiry" matching engine (希望条件入力機能) where investors input desired interest rate/term/size per company and issuers select from aggregated demand, order management, secondary-market buyback, interest distribution, and redemption. The company serves two segments simultaneously — affluent Japanese individual investors (average financial assets ~¥100M, average age 42, 97% with listed-stock experience) seeking 2–8%+ yen yield, and mid-to-late-stage startups/unlisted companies seeking non-dilutive debt capital. Named issuers include C Channel, Eco-Pork, DFree, Varinos, TENTIAL, Lantrip, and Gojo & Company, totaling 40+ companies and 100+ bond issuances with cumulative volume of ~¥3B+ as of July 2025.
Revenue is transaction-based: issuance/distribution fees from corporate issuers, spread on secondary-market buybacks, and (since April 2025) yield from underwriting. Account opening and investor purchases are commission-free; the company generates the bulk of revenue on the issuer side. As of June 12, 2026, Metaplanet (TSE:3350) agreed to acquire 100% of Siiibo for ¥2.1B (~$13.1M) under 'Project Nova,' with closing expected July 13, 2026 and rebranding to Metaplanet Securities to develop Bitcoin-linked yield products.
Siiibo firmographics
Firmographics- Name
- Siiibo
- Legal name
- Siiibo証券株式会社
- Website
- https://siiibo.com
- Company type
- Private
- Founded year
- 2019
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Siiibo Securities operates Japan's Type I-licensed online platform for retail-accessible private placement corporate bonds, using a reverse-inquiry matching engine and a proprietary secondary market to connect mid-to-late-stage startups and unlisted companies with affluent individual investors seeking 2–8%+ yen interest income.
- Ownership category
- akta.pro rank
Siiibo industry classification
Industry- Product category
- Online Securities Brokerage (Private Placement Bonds)
- NAICS
- Investment Banking and Securities Intermediation (523150), Securities and Commodity Contracts Intermediation and Brokerage (5231)
- SIC
- Security Brokers, Dealers & Flotation Companies (6211)
- akta.pro primary industry
- IPO & New Issue Issuer Services (Listing/ISIN setup) (FSACAKAH)
- akta.pro secondary industries
- Agency & Supranational Bond Trading Platforms (FSAFACAD), Capital Markets Advisory (IPO Readiness, SPAC, ECM/DCM Advisory) (BPAHAOAL)
Keywords
Where Siiibo is headquartered
LocationHeadquarters
- HQ city
- Tokyo
- HQ country
- Japan
- HQ region
- Asia
Offices1 record
Markets served
Siiibo business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Technology or R&D, Marketing or Sales, Operations, Infrastructure, Others
Revenue model
- Bond Issuance and Distribution Fees: Siiibo charges issuers fees for private placement bond issuance support (underwriting and solicitation services). Revenue is generated when companies issue bonds through the platform, with the company having started underwriting services in April 2025 to increase issuance amounts available. Fees are embedded in bond terms or charged as a transaction fee on issuance volume.
- Secondary Market Trading: When Siiibo buys back bonds from investors on the secondary market, it earns spread or transaction fees on the resale or hold.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Transaction based/ take rate | Pay-as-you-go | Individual bonds — Interest rates 2–8%+, yen-denominated, 1–4 year maturities, 500,000–3,000,000 yen per unit |
| Transaction based/ take rate | Pay-as-you-go | おまとめ債 (Repackage Bond) — bundled 5–20 bonds, rates follow underlying bonds, one purchase transaction |
Go-to-market motion1 record
Distribution channels1 record
Marketing channels5 records
Siiibo product offering
Product offeringCore offering
Siiibo Securities operates an FSA-licensed online platform enabling Japanese startups and unlisted companies to issue private placement corporate bonds (私募社債) directly to retail and individual investors. The platform manages the complete bond lifecycle — issuer screening and IR disclosure, investor onboarding via online eKYC, reverse-inquiry matching (investors input desired rate, maturity, and amount), subscription, secondary market liquidity via a platform-operated buyback/resale mechanism, and interest and redemption distribution. The company is a Type I Financial Instruments Business Operator (関東財務局長(金商)第3230号) and JSDA member, with related offerings including Omatome Bond (repackaged diversified bonds), Convertible Bonds via J-Ships, and Puttable Bonds.
Product overview
Siiibo Securities operates a unified online securities platform for private placement corporate bonds, connecting Japanese startups and mid-to-late-stage companies seeking debt financing directly with retail and institutional investors. The core offering is the Siiibo platform, which facilitates the issuance, purchase, and management of private placement bonds (私募社債). Key products include the Omatome Bond (おまとめ債) for diversified repackaged bond investments, and a Secondary Market (セカンダリーマーケット) for early redemption and liquidity. The platform also supports convertible bonds and provides IR information services for issuing companies. As a Type I Financial Instruments Business Operator, the company was acquired by Metaplanet in July 2026 and rebranded as Metaplanet Securities to develop Bitcoin-linked yield products under Project Nova.
Differentiator
Problem solved
Functional benefit
Products and services
- Siiibo Securities Online Platform (私募社債オンラインプラットフォーム) The proprietary online platform for private placement corporate bond issuance, subscription, secondary trading, and lifecycle management in Japan. Serves individual investors (retail accounts opened in ~3 minutes via online eKYC) and corporate issuers (startups/unlisted companies) requiring a Type I Financial Instruments Business Operator license and JSDA membership.
- Omatome Bond / Repackaged Bonds (おまとめ債) A diversified bond product that repackages 5–20 underlying individual corporate bonds into a single offering, allowing retail investors to achieve multi-issuer exposure with a single purchase and zero commission. Suited to investors who find single-bond selection burdensome and want built-in risk diversification.
- Private Placement Bonds (私募社債) Bonds issued to fewer than 50 specified investors through the Siiibo platform, designed for mid-to-late-stage Japanese startups and emerging-market listed companies seeking direct financing without equity dilution, bank covenants, or complex structured products. Investors earn 2–8%+ yen-denominated interest over 1–4 year maturities with ¥500,000–¥3,000,000 minimum units.
- Puttable Bonds (定期換金債, formerly 定期社債) Corporate bonds issued with periodic early-redemption options, allowing investors to either hold the bond for interest income or redeem early at predetermined dates with accrued interest payments. Designed for investors who want flexibility around reinvestment timing.
- Convertible Bonds (転換社債) Bonds offering a conversion option into the issuer's stock at predetermined conditions, offered to specified investors via the J-Ships system. Provides growth-equity-style upside through a debt instrument for investors who want exposure to issuer equity appreciation.
- Secondary Market (セカンダリーマーケット) Platform-operated secondary trading service providing liquidity for private placement bonds. Siiibo buys back bonds from investors seeking to exit before maturity and resells them to new investors, addressing the historic illiquidity of private placement bonds.
- Bond Underwriting Service (引受業務) Bond underwriting service launched in April 2025 allowing Siiibo to take principal positions in issued bonds, increasing the amount issuers can raise and the breadth of offerings available to investors on the platform.
- IR Information Service (IR情報サービス) Investor relations information platform for companies listing bond offerings on Siiibo, providing investors with financial data and business information to support due diligence and investment decisions.
Quantifiable outcome
- Cumulative bond issuance of 3 billion+ yen across 40+ companies and 100+ issuances
- +3 more outcomes
Companies that use Siiibo
Customer profileNamed customers9 records
Segments1 record
Ideal customer profiles2 records
Siiibo technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Integration2 records
Feature3 records
Siiibo partnerships and signals
Strategic signalPartnerships
Seven partnerships are on record, tiered minor.
- スピカコンサルティング (Spica Consulting)minorSiiibo entered into a partnership with Spica Consulting, an M&A intermediary, to expand its issuer sourcing network. Spica Consulting refers companies seeking alternative financing to Siiibo's bond issuance platform, enhancing deal flow for Siiibo.
- IFA法人Japan Asset ManagementminorSiiibo partnered with independent financial advisor (IFA) Japan Asset Management to expand its distribution reach to investors through financial advisory channels. IFA recommends Siiibo's bond investment platform to their clients.
- Relic Inc.minorSiiibo entered into a capital and business partnership (資本業務提携) with Relic, a startup ecosystem and innovation platform. The partnership aims to co-develop new financial products and expand the issuer/investor ecosystem.
- FAMORE (IFA)minorSiiibo partnered with IFA firm FAMORE to expand investor reach through financial advisory distribution.
- アセット・デザイナーズ (Asset Designers, IFA)minorSiiibo partnered with IFA firm Asset Designers to expand investor reach through financial advisory distribution.
- ADワークスグループ (AD Works Group CVC)minorSiiibo began collaboration with AD Works Group's corporate venture capital (CVC) arm, linking startup issuers with investment opportunities through the CVC's network.
- 400F Inc. (亡くすけない, お金の身体健康診断)minorSiiibo partnered with 400F, operator of the 'Financial Health Check' service, to cross-promote services and reach financially health-conscious consumers who may be interested in bond investment.
Scale indicators7 records
Recent moves10 records
Expansion highlights6 records
Siiibo competitors and assessment
Company assessmentDirect peers
- Funds (ファンズ, Funds Inc.): Japanese online retail investment platform focused on private placement and loan-based products for individual investors. Most direct competitor to Siiibo in private debt/fund intermediation to Japanese retail, with overlapping reverse-inquiry-style matching and similar yen-denominated yield targets.
- Crowdcredit (クラウドクレジット): Japanese alternative investment platform offering retail investors access to private loans and overseas debt instruments. Comparable in retail-yield-product intermediation and online self-serve onboarding, though focused on cross-border lending rather than domestic private placement bonds.
Broad incumbents
- SBI Securities (SBI証券): Largest Japanese online broker with full Type I license, broad retail investor base, and growing presence in corporate bond and structured product distribution. A scaled incumbent that could expand into Siiibo's niche private placement bond space via brand and balance sheet.
- Monex Securities (マネックス証券): Major Japanese online broker offering retail bond, ETF, and alternative investment products. Comparable in that it offers online securities accounts to affluent retail investors with a similar GTM motion; broader product breadth than Siiibo.
- Rakuten Securities (楽天証券): Top Japanese online broker combining commission-free trading, retail bond distribution, and ecosystem distribution through Rakuten Group. Could replicate Siiibo's online onboarding if it expands private placement bond sourcing.
- Aozora Bank (あおぞら銀行): Japanese mid-tier commercial bank with a dedicated CVC (Aozora Corporate Investment) that took a strategic stake in Siiibo. Comparable on Japanese private placement bond market participation and as an institutional counterparty; broader finance and lending scope.
Emerging players
- Owner's Book (オーナーズブック): Japanese online alternative investment platform offering retail access to private real-estate debt and equity. Niche like Siiibo but focused on real estate rather than corporate bonds; comparable on the retail alternative-investor funnel mechanics.
- Securitize Japan: Provider of digital securities issuance and trading infrastructure globally, with activity in Japan for tokenized private securities. Comparable on technology-driven private placement distribution and retail-investor accessibility to alternative debt instruments.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks6 records
Key highlights7 records
Customer concentration
Siiibo social profiles
Digital presenceSiiibo compliance and trust
Trust signalCompliance5 records
Siiibo financial estimates
Financial estimateRevenue estimate
Valuation estimate
Siiibo leadership team
Management profileNumber of profiles
Profiles3 records
Siiibo funding detail
Funding detailFunding overview
Funding rounds4 records
Investors10 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Siiibo M&A and investment
M&A and investmentM&A
Investments9 records
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Siiibo
What does Siiibo do?
Siiibo Securities operates an FSA-licensed online platform enabling Japanese startups and unlisted companies to issue private placement corporate bonds (私募社債) directly to retail and individual investors. The platform manages the complete bond lifecycle — issuer screening and IR disclosure, investor onboarding via online eKYC, reverse-inquiry matching (investors input desired rate, maturity, and amount), subscription, secondary market liquidity via a platform-operated buyback/resale mechanism, and interest and redemption distribution. The company is a Type I Financial Instruments Business Operator (関東財務局長(金商)第3230号) and JSDA member, with related offerings including Omatome Bond (repackaged diversified bonds), Convertible Bonds via J-Ships, and Puttable Bonds.
Is Siiibo a public or private company?
Siiibo is a private company. It is classified as venture growth investor backed and is currently operating.
When was Siiibo founded?
Siiibo was founded in 2019. It employs 11 to 50 people.
Where is Siiibo based?
Siiibo is headquartered in Tokyo, Japan, in the Asia region.
How does Siiibo make money?
Two revenue lines are on record. Bond Issuance and Distribution Fees are the primary driver. The others are secondary Market Trading.
Who are Siiibo's main competitors?
Direct peers on record are Funds (ファンズ, Funds Inc.) and Crowdcredit (クラウドクレジット). Broad incumbents are SBI Securities (SBI証券), Monex Securities (マネックス証券), Rakuten Securities (楽天証券) and Aozora Bank (あおぞら銀行). Emerging players are Owner's Book (オーナーズブック) and Securitize Japan.
Does Siiibo have an API?
No public API is recorded for Siiibo.
What industry is Siiibo in?
Siiibo's product category is Online Securities Brokerage (Private Placement Bonds). Its primary akta.pro industry code is FSACAKAH, IPO & New Issue Issuer Services (Listing/ISIN setup), with a secondary code of FSAFACAD, Agency & Supranational Bond Trading Platforms. Its NAICS code is 523150 and its SIC code is 6211.