Bitcoin surged 21.5% between the Aug. 17 and Aug. 21 closes, but six of the seven major U.S.-listed Bitcoin miners ended the same trading period lower. MARA Holdings gained 16.1%, making it the closest performer to BTC, while Cipher Digital fell 14.8%, TeraWulf declined 11.2%, Hut 8 dropped 8.1% and IREN lost 6.8%.
The divergence shows that stocks still widely treated as Bitcoin proxies are increasingly responding to factors beyond the cryptocurrency itself.
Bitcoin miners diverge as AI businesses expand
The Nasdaq-100 ETF QQQ fell 2.3% during the same sessions as long-term Treasury yields remained volatile, placing the miners within a weaker technology-equity environment. Their changing corporate structures help explain the split. Several former mining specialists now derive revenue, financing needs or future valuations from long-duration debt, artificial intelligence infrastructure and Bitcoin sales that help finance those projects.
Construction schedules, equipment procurement and customer concentration have therefore become important parts of valuations that once depended primarily on mining economics and hash prices.
Company filings show that the major public miners are at different stages of their transition toward artificial intelligence and high-performance computing.
TeraWulf generated $31.9 million of its $44.8 million in second-quarter revenue from high-performance-computing leases, compared with approximately $12.8 million from digital assets. Hut 8 said its Beacon Point leases cover 949 megawatts of contracted IT capacity and represent $26.6 billion in base-term contract value, subject to future delivery and tenant performance.
IREN reported $70.5 million in AI cloud revenue and $66.7 million in Bitcoin mining revenue for its June quarter, placing AI above mining in its current revenue mix. In an Aug. 27 release, the company reported operating annual recurring revenue of $1 billion as of Aug. 26 and contracted annual recurring revenue of $4 billion tied to 2026 capacity. That capacity is targeted to become operational by Dec. 31, subject to commissioning, testing and customer acceptance.
IREN’s quarter also included a $450.4 million impairment, largely related to decommissioned mining hardware as its sites are converted for AI operations.
Cipher continued to report second-quarter revenue from Bitcoin mining, but it has contracted 700 megawatts of high-performance-computing capacity across three sites and began delivering its first capacity at Black Pearl in August.
Riot Platforms occupies a more balanced position. The company reported $113.7 million in mining revenue, $23.2 million from data centers and $37.3 million from engineering during a $174.2 million quarter. Its 241 megawatts of contracted AI capacity carry approximately $9.8 billion in company-estimated long-term revenue, giving investors a contract book to value alongside the 11,380 Bitcoin Riot held as of June 30.
CleanSpark might have served as a mining-only control earlier in the year, but that classification changed before the August breakout. The company signed a 20-year, $6.6 billion agreement. MARA now offers the closest large mining-led comparison, although it is also exploring adjacent energy and computing businesses.
Bitcoin beta and technology-market exposure
CryptoSlate analyzed Alpaca/IEX historical equity closes for HUT, WULF, IREN, CIFR, RIOT, MARA, CLSK and QQQ, along with Alpaca’s BTC/USD closes, from Aug. 22, 2024 through Aug. 24, 2026.
Daily stock returns used exchange trading days. Each Bitcoin return covered the interval between consecutive stock-market dates, meaning Monday observations included the weekend. Ten-year Treasury yields came from the Federal Reserve’s DGS10 series.
Close-to-close returns from Aug. 17 through Aug. 21 captured the initial separation by comparing Bitcoin’s rally with QQQ as a broad technology-equity reference for the same sessions.
The longer analysis used rolling 90-trading-day correlations and univariate Bitcoin betas. One comparison ended Aug. 22, 2025, while the current comparison ended Aug. 24, 2026.
A Bitcoin beta of 1.10 means that a 1% daily move in Bitcoin was associated with an average 1.10% move in the miners during that period. Correlation measures how consistently the stocks’ directions and magnitudes moved alongside Bitcoin.
Bitcoin beta declined from the comparable 2025 period for six companies, while IREN remained near 0.93. Bitcoin correlation fell for six companies and increased for WULF, rising from an already low 0.17 to 0.22.
In the current period, QQQ correlation exceeded Bitcoin correlation for all seven companies. Their daily returns therefore tracked the Nasdaq proxy more consistently than the cryptocurrency they mine.
MARA retained the group’s highest Bitcoin correlation and beta, consistent with its greater dependence on mining economics. HUT, WULF and CIFR ranked in the bottom half for current Bitcoin correlation as their data-center contracts gained more importance in investor estimates.
IREN complicates that pattern. Its Bitcoin beta remained steady even as its QQQ correlation reached 0.60, allowing its operating mining business and substantial AI pipeline to influence the same return series.
CryptoSlate also conducted a 2026 year-to-date regression using daily Bitcoin returns, QQQ returns and daily changes in the 10-year Treasury yield. The three-factor model explained approximately 28% to 45% of daily variation across the seven miners. The estimated effect of a 10-basis-point increase in Treasury yields ranged from a 0.52% decline for WULF to a 0.79% gain for CIFR.
Four rate coefficients were negative and three were positive, providing no evidence of a common duration trade across the group. The mixed results also make a simple bond-market analogy difficult. Higher yields can reduce the present value of cash flows expected years in the future and increase project financing costs, but daily equity returns also reflect tenant announcements, construction progress, Bitcoin holdings, power prices and capital raises.
Contracts explain why the companies carry different exposures, while the data show no consistent interest-rate trade across the sector.
AI contracts create a second risk map
TeraWulf provides the clearest example of a company whose income statement has already moved into a new category. High-performance-computing leases supplied approximately 71% of its second-quarter revenue, and its filings describe the repurposing or curtailment of mining equipment as computing capacity expands.
A Bitcoin rally can support TeraWulf’s remaining mining operations, but the equity valuation now also depends on tenant payments, construction execution and the financing associated with its computing campus.
Cipher shows how a company’s stock-market identity can change before its reported revenue mix does. Its June quarter still reflected Bitcoin mining, but investors can also model its contracted computing capacity and the company-estimated $793 million in average annual net operating income associated with its base lease terms.
The gap between current revenue and promised capacity makes delivery schedules, capital costs and counterparty quality central factors for the share price.
Riot and IREN display both types of exposure more clearly, although their current revenue mixes have diverged. Mining accounts for most of Riot’s current revenue, while AI cloud revenue slightly exceeded Bitcoin mining revenue in IREN’s June quarter.
Their mining operations remain sensitive to digital-asset prices, while signed AI agreements add projected cash flows from another business line. Each quarterly filing can change the relative importance of Bitcoin production and data-center delivery, making beta a function of business mix rather than a permanent characteristic of the company.
Contract announcements also contain significant uncertainty. Base-term value represents payments expected over many years, while revenue and net operating income estimates depend on timely delivery. Project-level debt may protect a parent company’s balance sheet, but only within the limits of the relevant structure.
A multiyear contract value can help identify a company’s strategic direction, but it cannot replace a discounted cash-flow model or completed operating capacity.
Mining stocks now combine crypto, AI and infrastructure risk
The Aug. 17 breakout captured a genuine separation, and the longer sample confirms a broader reclassification of the sector. MARA rose alongside Bitcoin, every company retained a positive current Bitcoin beta, and mining cash flow continues to fund or support several AI buildouts.
Bitcoin is now one factor among several. Its influence is lowest where contracted computing capacity has become the central part of the equity story.
“Bitcoin miners” now describe these companies’ origin more reliably than their destination. Investors who buy the group through a mining-focused basket may receive varying exposure to Bitcoin production, hyperscaler credit, construction schedules, power-delivery risk, project finance and technology-equity multiples.
The contracts help explain why the stocks separated, while their remaining Bitcoin betas show that their original identity still travels with them.
