Metaplanet is making its first major acquisition, agreeing to buy 100% of Siiibo Securities as the bitcoin treasury company moves to build a regulated financial platform in Japan.

The company said Siiibo, a pioneer in Japan’s online corporate bond market, will be renamed Metaplanet Securities after closing. Simon Gerovich, Metaplanet’s CEO, said the deal is the first concrete step in Project Nova, the company’s long-term plan to create a bitcoin-centered financial ecosystem in Japan. Gerovich tweeted:

By bringing Siiibo’s online securities platform into the group, we will develop and distribute bitcoin-related yield products directly to Japanese investors, supported by the 40,177 BTC on our balance sheet.

Metaplanet’s supplemental materials put the total acquisition price at $13 million (¥2.1 billion) for common and preferred shares combined. The company expects Siiibo to become a wholly owned subsidiary, with completion procedures planned for August 2026. Gerovich separately said closing is expected in July.

Siiibo is registered as a Type I Financial Instruments Business Operator under Japan’s Financial Instruments and Exchange Act. That license allows it to structure and distribute financial products. Founded in 2019 and based in Tokyo, Siiibo runs an online private placement bond platform and has supported more than 40 companies and over 100 bond issues.

Metaplanet holds 40,177 BTC on its balance sheet as of June 12, 2026. The company says that makes it Asia’s largest corporate bitcoin holder, the third-largest globally, and the only non-U.S. company in the global top 10.

This acquisition is designed to turn its treasury position into a broader financial business. Metaplanet plans to develop and distribute bitcoin-related yield products, digital securities, bitcoin-backed preferred shares, lending services, and other BTC-linked instruments through Metaplanet Securities.

Top five public bitcoin treasury companies. Source: Bitcoin Treasuries

Japan is central to the strategy. The company estimates that households hold about $7.4 trillion (¥1.190 quadrillion). This cuts across cash, deposits, government bonds, domestic money-market funds, monthly-distribution funds, and corporate bonds. Much of that capital remains in low-yield products, but inflation and rising rates are pushing investors to seek better returns.

Metaplanet wants to capture part of that shift. The company says Metaplanet Securities will provide financial products to Japanese investors, including its roughly 250,000 shareholders.

Siiibo CEO Kazuki Komura and the existing team are expected to remain involved after the transaction. Metaplanet said existing customers will continue to receive services as before.

For Metaplanet, the deal marks a move beyond simple bitcoin accumulation. The company is trying to combine a large BTC balance sheet, securities distribution, and regulated financial infrastructure into a single platform. It’s a bet that Japan’s next search for yield will include bitcoin-powered products.

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