Metaplanet has agreed to acquire all outstanding shares of Siiibo Securities Co., Ltd. for approximately 2 billion yen, or about $13.11 million, as the Japanese Bitcoin treasury company moves to build a Bitcoin-focused financial platform in Japan.
The acquisition will make Siiibo Securities a wholly owned subsidiary of Metaplanet, with the firm expected to be renamed Metaplanet Securities Inc. after completion. The share transfer agreement was signed on June 12, and the transaction is expected to close on July 13, with the rebranding process planned for completion by the end of August 2026.

Metaplanet said the transaction is the first major merger and acquisition step under its long-term “Project Nova” strategy, which is aimed at creating a Bitcoin-centered financial ecosystem that can offer new investment products to Japanese investors.
Siiibo Securities holds a Japanese Type I Financial Instruments Business license and operates an online securities platform focused on corporate bonds. The company has supported more than 40 companies and handled over 100 bond issuances and underwriting transactions.
By acquiring Siiibo Securities, Metaplanet gains access to an existing regulated platform and investor base in Japan’s securities market. The company said it plans to use those capabilities to develop and distribute Bitcoin-related yield products, including Bitcoin-linked bonds.
Metaplanet also said the subsidiary may support the structuring and issuance of digital finance products, including security tokens. Those products would use Siiibo’s regulatory position and online platform while being supported by Metaplanet’s Bitcoin treasury strategy.
The purchase price will be funded mainly through Metaplanet’s own cash reserves and borrowings. The company may also use a Bitcoin-collateralized credit facility with a total limit of up to $500 million, depending on market conditions and financing needs.
Metaplanet said the acquisition marks the first concrete step in Project Nova, a strategy designed to expand the company beyond Bitcoin treasury management and into Bitcoin-linked financial services.
The company, as a result, plans to use Metaplanet Securities to offer new Bitcoin yield opportunities in Japan. These may include products linked to Bitcoin performance, bond structures backed by Bitcoin-related strategies, and digital securities designed for regulated investors.
As of May 31, Metaplanet held 40,177 BTC on its balance sheet. The company reported net asset value of about 457.6 billion yen, giving the new securities subsidiary access to a large Bitcoin-backed corporate platform.
The acquisition comes as Japanese households continue holding large amounts of cash and low-yield deposits. The market opportunity cited by the company centers on demand for yield products as Japan moves away from a long deflationary period and investors reassess savings, income, and inflation exposure.
Metaplanet’s planned acquisition fits into a broader shift in Japan’s digital finance sector. Regulated firms are exploring products tied to Bitcoin, stablecoins, security tokens, and blockchain-based settlement as demand for digital asset exposure grows.
Siiibo Securities’ experience in online corporate bond issuance gives Metaplanet a foundation for launching structured financial products inside Japan’s existing regulatory framework. The company said the merger will support the development of Bitcoin-related products while recognizing Siiibo’s work in building Japan’s online bond market.
The planned renaming to Metaplanet Securities will place the acquired business directly under the company’s Bitcoin-centered brand. After closing, the subsidiary is expected to focus on regulated distribution, product structuring, and investor access.
Metaplanet said the deal is intended to strengthen its long-term Bitcoin strategy while expanding its business model beyond balance sheet accumulation.
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