MARA Holdings (NASDAQ: MARA) reported a Q4 2025 net loss of $1.7 billion — compared to net income of $528.3 million a year earlier — as a $1.5 billion decline in the fair value of its Bitcoin (BTC) holdings wiped out operating gains, even as the company announced a joint venture with Starwood Digital Ventures aimed at pivoting its power-rich mining sites toward AI and high-performance compute.

What Happened: Q4 Loss, Starwood Deal

Revenues fell 6% to $202.3 million from $214.4 million in Q4 2024, driven by a 14% drop in the average price of Bitcoin mined during the quarter. Full-year revenues grew 38% to $907.1 million, but that topline growth was overshadowed by the massive quarterly writedown on digital asset holdings.

MARA held 53,822 BTC valued at roughly $4.7 billion as of Dec. 31, 2025, up 20% year over year. Energized hashrate rose 25% to 66.4 EH/s, though that fell short of the company's own 75 EH/s target — a gap MARA attributed to capital discipline rather than operational failure.

The Starwood joint venture, announced alongside the quarterly results, would have MARA contribute data center sites while Starwood handles design, construction, tenant sourcing and operations. The initial phase targets more than 1 gigawatt of IT capacity, with a roadmap stretching beyond 2.5 GW. MARA can invest up to 50% in individual projects, and Bitcoin mining would continue at sites where power costs remain favorable.

The quarter was also the first since 2022 in which MARA did not tap its at-the-market stock offering program, opting instead to sell mined Bitcoin to fund operations. Separately, the company acquired a 64% stake in Exaion to build out AI capabilities and bought a 42-megawatt data center in Nebraska.

Despite the steep loss — $4.52 per diluted share versus analyst expectations of a $0.03 loss — MARA shares rose 6.2% following the earnings release. The market reaction appeared tied to the Starwood announcement and the company's broader repositioning, with CEO framing the shift in stark terms: MARA is "no longer simply a Bitcoin miner."

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Why It Matters: Mining Economics Under Pressure

The results lay bare the balance sheet risk of holding large Bitcoin positions at a time of price volatility. BTC dropped from $114,068 at the end of Q3 to $87,498 by Dec. 31, dragging MARA's adjusted EBITDA to negative $1.5 billion from positive $796 million a year earlier.

The pivot toward AI infrastructure follows a pattern across the mining industry, where operators are racing to repackage power assets for higher-margin compute workloads as energy constraints tighten and Bitcoin mining economics get squeezed. Whether that strategy delivers remains an open question — MARA has yet to generate revenue from AI or HPC operations, and the Starwood venture is still in its early stages.

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