Siiibo Securities has adopted the Metaplanet Securities name following the July 13 closing of Metaplanet’s ¥2.1 billion ($13.1 million) acquisition.
The transaction gives Tokyo-listed Metaplanet full ownership of a registered Type I Financial Instruments Business Operator with an established corporate bond platform and direct access to Japanese investors.
Siiibo has handled more than 100 private bond offerings for around 40 companies since its 2019 launch. Its license covers securities underwriting, brokerage, distribution and the handling of public and private offerings.
The ¥2.1 billion acquisition is the first major transaction under Project Nova, Metaplanet’s plan to build a regulated financial business around its Bitcoin treasury. The purchase was funded primarily through cash and borrowings, with up to $500 million in Bitcoin-backed credit facilities available as supplemental financing.
Bitcoin-Linked Bonds And Tokenized Securities Planned
Metaplanet Securities will develop and distribute Bitcoin-linked yield products, corporate bonds, digital securities and other tokenized financial instruments.
The brokerage gives Metaplanet the regulated infrastructure needed to structure products and distribute them directly rather than relying entirely on outside securities firms. The business will target retail and institutional investors seeking income products connected to Bitcoin and digital finance.
Metaplanet held 40,177 BTC when the acquisition was announced in June, the same treasury position that produced a $725 million first-quarter accounting loss after Bitcoin prices fell. Its holdings increased to 43,000 BTC following an additional purchase disclosed on July 2.
The securities arm extends a wider corporate expansion that included new subsidiaries in Japan and the United States and the acquisition of the Bitcoin.jp domain.
JPYC And Progmat Join Digital Credit Study
Metaplanet Securities has also joined Metaplanet, yen stablecoin issuer JPYC and tokenization platform Progmat in a Bitcoin-backed digital credit study.
The project will examine credit products using Bitcoin as collateral, JPYC for yen-denominated settlement and security tokens for issuance and transfer. The group is also studying continuous settlement outside traditional banking hours and structures that connect corporate bonds with onchain payment rails.



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