SBI takes Japan's crypto custody lead with a 46.7 billion yen Bitbank buyout

The deal ran in three steps. SBICAH, a wholly owned SBI unit, first bought 53,704 shares from founder Noriyuki Hirosue and other individual holders ^[5]. Bitbank then issued 48,952 new shares to SBICAH and spent that cash buying back the stakes of MIXI and Ceres, its two largest corporate backers ^[6]. The founder was paid directly by SBI. The corporate holders were paid by Bitbank, out of money SBI had just put into it. The reported disclosure does not split the 46.7 billion yen ^[1] between the steps or say why the corporate sellers went through a buyback.

Spread over Bitbank's roughly 960,000 registered accounts ^[3], the price is about 48,600 yen an account ^[2]. Cryptopolitan's report describes Bitbank as unprofitable ^[10], so there is no earnings multiple to compute. Architect Partners said SBI paid for scale under regulation, not earnings ^[9].

Cryptopolitan reports that Japan's move of crypto under the Financial Instruments and Exchange Act raises compliance and capital costs for smaller standalone platforms, and that analysts cite this as a driver of the current deals ^[18][19]. Bitbank fits the standalone half of that description better than the smaller half. Take its roughly 570 billion yen in custody ^[11] from the combined 1.1 trillion yen ^[12] and SBI's existing platform held about 530 billion yen at the end of April ^[3]. Both inputs are rounded, so Bitbank brought about half the combined custody. By accounts the split runs the other way: about 2 million on SBI's side against Bitbank's near-million ^[4]. On those figures, Bitbank's customers held roughly twice as much each ^[5].

The cross-appointments between Bitbank and SBI VC Trade ^[7], and the departure of three Bitbank outside directors ^[8], suggest the two exchanges are being integrated in stages. For now SBI is running Bitbank as its own exchange with services unchanged ^[3]. That means it is not yet taking whatever cost savings a merger with SBI VC Trade would bring. Bitpoint Japan took about four years to go from SBI's first stake in 2022 to full absorption in April 2026 ^[6].

If compliance costs land hardest on independents, more of them sell. Steve Payne, co-founder of Architect Partners, wrote "We expect consolidation to continue," ^[14] and named bitFlyer, the last large independent, as "an obvious next domino" ^[15]. The flat 20% tax on crypto gains in the same legislation ^[18] could instead lift trading enough for standalone platforms to carry the extra cost. SBI could also run parallel exchanges for so long that the scale it bought never shows up in its own costs. I think the first outcome is the likeliest, because SBI has taken on the customers of four exchanges since 2020 ^[7]. The thesis fails if bitFlyer gets through the transition on its own.