Bitcoin Miners Surge Following Microsoft’s $17.4B AI Bet

The rally in mining shares came even as bitcoin BTC$111,290.84 itself gave up an early advance and declined by about 1% to $111,100 over the past 24 hours. The contrast underscored how investor attention is increasingly tied to the role mining infrastructure could play in the AI boom rather than just bitcoin’s price action.

Leading was a 22% gain for Bitfarms (BITF), while shares of Cipher Mining (CIFR) rose 20%. IREN (IREN), Hut 8 (HUT), Riot Platforms (RIOT) and TeraWulf (WULF) were up mid-teens percentages.

Interestingly, the weakest sector performer was MARA Holdings, which in recent months has positioned itself as more of a bitcoin treasury company, rather than high performance computing player. Shares of MARA were higher by just 4% on Tuesday.

The outsized moves reflect the industry’s shifting reality. For years, mining profitability was largely dictated by bitcoin’s four-year halving cycle, when block rewards are cut in half. That rhythm no longer dominates, leaving companies exposed to surging power costs, relentless hardware production, and intensifying competition. Hardware makers like Bitmain continue to expand, adding pressure to an already crowded field.

At the same time, AI is reshaping the business model. Miners with large energy footprints and advanced computing infrastructure are exploring ways to lease capacity to hyperscalers or pivot toward data center services. The Nebius-Microsoft deal highlighted how valuable GPU access has become and why markets are rewarding miners with scalable infrastructure.

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