Tether International just acquired SoftBank’s entire stake in Twenty One Capital, the Bitcoin treasury company that trades on the NYSE under the ticker XXI. The deal closed on May 20, 2026. SoftBank’s board representatives stepped down immediately. No price was disclosed, but Bloomberg data shows SoftBank held approximately 26% of XXI’s publicly listed shares, worth roughly $679 million at current prices.
Six months ago, Tether and SoftBank were partners. Now Tether is the sole controlling shareholder of one of the three largest corporate Bitcoin holders on the planet.
How Twenty One Capital Got Here
Twenty One Capital launched in December 2025 through a SPAC merger with Cantor Equity Partners. It debuted with over 43,500 BTC, roughly $4 billion at the time, making it the third-largest corporate Bitcoin holder behind Strategy and a small handful of others. Tether and Bitfinex supplied the majority of the Bitcoin. SoftBank contributed a minority stake equivalent to about 10,500 BTC.
The company is run by Jack Mallers, founder of Strike. The pitch was straightforward: build a public company from the ground up around Bitcoin, optimize for Bitcoin per share rather than earnings per share, and let the capital markets do the rest. The corporate Bitcoin accumulation race already had Strategy as the dominant player. XXI wanted to be different: more operational, more Bitcoin-native.
Why SoftBank Left
Neither Tether nor SoftBank said why the deal happened. But the context is not hard to read.
SoftBank has been restructuring its portfolio aggressively throughout 2026, cutting positions in companies outside its core AI thesis. The Vision Fund posted mixed results in Q1, and Masayoshi Son has been vocal about concentrating capital around artificial intelligence rather than spreading it across adjacent plays. A Bitcoin treasury company, however promising, does not fit the AI infrastructure narrative that Son is selling to investors.
For Tether, the calculus is the opposite. The stablecoin issuer has been on an acquisition spree in 2026. It invested in LemFi for cross-border remittances. It froze $450 million in illicit assets through its T3 Financial Crime Unit. It launched a developer grants program. And it proposed merging XXI with Strike and Elektron Energy to create an integrated Bitcoin company spanning treasury accumulation, mining, lending, and financial services.
What Tether Actually Controls Now
With SoftBank’s board seats gone and its shares absorbed, Tether is the uncontested decision-maker behind a company holding 43,514 BTC worth approximately $3.4 billion. That is separate from Tether’s own Bitcoin reserves, which stood at 97,141 BTC as of the last disclosure. Combined, Tether-controlled entities hold north of 140,000 BTC.
Tether is now simultaneously the issuer of the world’s dominant stablecoin, the majority owner of a publicly listed Bitcoin treasury company, and a proposed acquirer of a Bitcoin mining and energy operation. That is vertical integration at a scale no crypto company has attempted before. Meanwhile, Tether’s share of the stablecoin market is shrinking for the first time, which makes the diversification into Bitcoin infrastructure look less like ambition and more like a hedge.
XXI vs. Strategy: Two Models, One Bet
The comparison with Michael Saylor’s Strategy is inevitable. Strategy holds over 843,000 BTC and has a market cap around $110 billion. Its model is pure accumulation: issue debt, buy Bitcoin, repeat. Saylor has said he will never sell, though prediction markets have been skeptical.
XXI is trying to be something different. It wants to combine accumulation with operations. Mining through Elektron. Payments through Strike. Lending and capital markets through the XXI parent. If the three-way merger goes through, Twenty One Capital would be the first public company offering Bitcoin exposure across the entire value chain. Strategy itself has been experimenting with new structures like semi-monthly STRC dividends to boost liquidity. The race for the best Bitcoin treasury model is getting crowded.
XXI shares have been volatile since the December listing, tracking Bitcoin’s own price swings closely. The market cap has ranged between $3 billion and $5 billion. Whether Tether’s full control stabilizes or accelerates the volatility depends on what comes next: the Strike merger, the Elektron integration, and whether 43,514 BTC under one corporate umbrella attracts the kind of institutional capital that Tether is betting on.
