A decisive shift toward artificial intelligence and high-performance computing infrastructure reshaped bitcoin mining stocks in 2025, rewarding diversified operators while leaving pure-play miners trailing the broader market.

As the year comes to a close, bitcoin (BTC) is down roughly 7% year-to-date, underperforming gold, the S&P 500 and technology stocks, all of which have continued to push to record levels. That weakness has been reflected unevenly across publicly listed miners, with performance increasingly tied to strategic exposure beyond bitcoin.

Companies that aggressively expanded into AI and HPC delivered the strongest returns. IREN (IREN) led the group with a roughly 300% year-to-date surge, driven by large GPU cloud contracts and strategic support from Microsoft. Cipher Mining (CIFR) followed with gains of about 230%, supported by growing AI hosting partnerships, including with Fluidstack. Hut 8 (HUT) also posted strong performance, rising around 139% after announcing a $7 billion, 15-year lease to develop a 245-megawatt AI data center at its River Bend facility in Louisiana.

In contrast, miners holding the largest bitcoin reserves saw more muted or negative returns. Marathon Digital (MARA), the largest BTC holder among miners with 53,250 bitcoin, is down roughly 44% on the year. CleanSpark (CLSK), with 13,011 BTC, and Riot Platforms (RIOT), holding 19,324 BTC, recorded gains of 16% and 32%, respectively, after delaying more meaningful diversification into AI initiatives.

Core Scientific (CORZ) took a different route after shareholders rejected a $9 billion all-stock acquisition proposal from CoreWeave in October. While the company opted to remain independent and position itself to benefit from rising AI demand, its shares are up just 9% year-to-date.

Bitdeer Technologies (BTDR) emerged as the sector’s weakest performer, with shares down about 50% in 2025. Most of the losses followed its third-quarter earnings release, which revealed a larger-than-expected net loss and delays to its ASIC chip development, raising concerns about the pace and execution of its AI expansion.

Taken together, 2025 reinforced a clear market message: bitcoin miners that successfully repurposed infrastructure for AI data centers significantly outperformed those that remained primarily exposed to bitcoin mining.