Riot Platforms Jumps 25% After Signing $9.1B Data Center Lease With Anthropic

$9.1 billion over 20 years. That is the headline number behind Riot Platforms' biggest single deal in its history, a long-term data center lease with AI company Anthropic that sent the stock surging as much as 25% in after-hours trading on Tuesday.

The agreement covers 191 megawatts of capacity at Riot's Rockdale, Texas campus and runs through June 2048. For Anthropic, the deal locks in a substantial slice of dedicated AI compute infrastructure for the next two decades. For Riot, it converts idle or underused power capacity into a predictable, multi-decade revenue stream, a very different business than selling freshly mined bitcoin into spot markets.

Riot shares climbed roughly 20% in pre-market trading before extending to approximately 25% in after-hours activity. The magnitude of the move reflects just how significant the market views the strategic shift. Bitcoin mining margins have been under sustained pressure since the April 2024 halving cut the block subsidy to 3.125 BTC, and the AI infrastructure buildout has created a competing use case for the same core asset miners hold: cheap, large-scale power capacity in purpose-built facilities. Riot's Rockdale site, one of the largest Bitcoin mining campuses in North America, is exactly the kind of facility hyperscalers and AI labs have been hunting.

A 20-year commitment to a single tenant concentrates counterparty risk entirely on Anthropic's financial health across two full decades. Anthropic is well-capitalized today, having raised billions from Amazon and Google, but the AI sector's competitive dynamics in 2035 or 2040 are genuinely unknowable. Fixed-rate infrastructure leases in fast-moving tech verticals carry execution risk on both sides. If power costs rise sharply or if Anthropic's compute needs shift toward different architectures, the economics of the deal could look different in year ten than they do today.

Sentiment data from the announcement period skews notably bearish, with an overall score of -0.755 and one source registering -0.953, suggesting that professional observers are less euphoric than the stock price movement implies. The gap between equity market enthusiasm and analytical skepticism is worth watching.

Riot is not alone in this pivot. Core Scientific signed a 200-megawatt deal with CoreWeave in 2024, a transaction that helped reframe the entire mining sector's valuation narrative. Cipher Mining, Hut 8, and others have announced similar infrastructure-leasing strategies as they seek to reduce exposure to bitcoin price volatility and mining difficulty adjustments. The Anthropic deal is the largest single contract of this type announced to date, by dollar value, which explains why Riot's stock reacted so sharply even against a backdrop of general skepticism about the sector's direction.

What the deal does not do is eliminate Riot's Bitcoin mining exposure entirely. The company still operates significant hashing capacity, and its financial results will remain tied to BTC price and network difficulty for the foreseeable future. The Rockdale lease carves out 191 MW for Anthropic, but Riot's total operational footprint extends well beyond that. The strategic question is whether management uses the guaranteed lease revenue to fund continued mining expansion, pay down debt, or accelerate further infrastructure deals with other AI tenants.

At $9.1 billion across 20 years, the implied annual revenue from the Anthropic lease runs roughly $455 million per year, a figure that would represent a transformative addition to Riot's top line if the contract performs as structured. The market has already priced in a significant portion of that optimism. Whether the deal's economics hold through 2048 is a question that will take considerably longer to answer.