Sumitomo Mitsui to Take Near-5% Stake in SBI's Yen Stablecoin Venture

Sumitomo Mitsui Backs SBI's JPYSC Venture

Sumitomo Mitsui Financial Group will take a stake of close to 5% in SBI Startale Marketing, the joint venture set up by SBI Holdings and Singapore-based Web3 firm Startale Group, according to a report in the Japanese business daily Nikkei published on October 30. The investment anchors a fresh capital and business alliance between Sumitomo Mitsui and SBI, and its stated purpose is to build financial services that put the yen stablecoin JPYSC to work in asset management and payments. Sumitomo Mitsui's contribution is distribution reach: Sumitomo Mitsui Bank serves roughly 24 million individual customers, a base the partners intend to use to push JPYSC into everyday financial services. SBI Startale Marketing plans use cases for JPYSC and develops blockchain-based financial products, and the venture expects Sumitomo Mitsui's entry to widen both circulation and applications. Longer term, the bank is weighing whether JPYSC can settle purchases of financial products traded on-chain and support instant payment settlement. JPYSC itself runs on a trust structure: SBI Shinsei Trust Bank issues it as a Class 3 electronic payment means under Japan's payment services rules, meaning a licensed trust bank holds the backing funds, while SBI VC Trade handles distribution. The trust wrapper matters for a bank-scale rollout, because it keeps customer money inside a regulated entity and gives the token a legal status Japanese banks can build products on. The stablecoin went live on June 24, 2026, and its outstanding balance stood at about 20.8 billion yen as of October 30, one of the larger regulated yen tokens in circulation even though it remains small next to dollar issuers. The alliance extends a retail relationship the two groups have built since 2022, and it lands as Japan's megabanks move from stablecoin pilots toward live issuance.

Three Megabanks Run a Parallel Track

The stake purchase is not Sumitomo Mitsui's only stablecoin project. Together with Mitsubishi UFJ and Mizuho, Sumitomo Mitsui Bank is part of the three-megabank plan to jointly issue a trust-type yen stablecoin, announced on June 10, 2026, with live transactions targeted within the current Japanese fiscal year, which ends in March 2027. A proof of concept ran from July 17 to July 23, simulating payments for Mitsubishi Corporation between its domestic and overseas sites with Mitsubishi UFJ Trust acting as trustee. The banks published the results on October 16, saying the trial confirmed the feasibility of the joint issuance model, and Nikkei's report frames the joint coin as a tool for trade settlement. Separately, Sumitomo Mitsui Bank and SBI VC Trade signed a basic agreement on August 22, 2025 to study domestic stablecoin circulation, with the bank as issuer and SBI VC Trade as a licensed electronic payment instruments trader. The SBI relationship itself dates to a comprehensive capital and business alliance in June 2022; the following month Sumitomo Mitsui subscribed to a third-party allotment that left it with roughly a 10% holding in SBI Holdings. In 2025 the groups jointly founded Olive Consulting, a retail asset-management advisory. SBI and Startale announced their joint venture on August 22, 2025 to develop infrastructure for tokenized equities and real-world assets, a structure that represents share rights as on-chain tokens and, through smart contracts, allows round-the-clock trading and small-denomination ownership. SBI injected about $50 million into Startale through a subsidiary on March 26, 2026, and Startale also co-developed the Soneium blockchain with Sony Group. On Thursday, SBI additionally disclosed that SBI Shinsei Trust Bank will absorb SBI Clearing Trust on December 31, pending regulatory approval, concentrating trust and custody expertise in the JPYSC issuer.

One Group, Two Yen Stablecoin Tracks

The two tracks are complementary rather than duplicated. JPYSC gives Sumitomo Mitsui a regulated retail instrument it can embed in banking products now, while the three-bank coin targets wholesale trade settlement later; the companies' own announcements describe the structure but stop short of pricing the stake or dating the new services. Distribution is where a commercial bank earns its place, and 24 million customers make Sumitomo Mitsui Bank the largest retail funnel in either project. The scale gap is the open question: JPYSC's outstanding 20.8 billion yen is a rounding error next to the dollar stablecoin floats run by issuers such as Circle Internet Group, and Web3 rails alone do not close it. Adoption will depend on whether the partners ship products customers actually use.