Shares of five major US-listed Bitcoin mining companies posted steep losses in the five trading sessions that ended Friday, October 16, 2026. IREN Limited (IREN), MARA Holdings (MARA), CleanSpark (CLSK), Hut 8 Corp. (HUT), and Riot Platforms (RIOT) fell between roughly 19% and 23% as hotter-than-expected US inflation data and rising doubts over debt-funded artificial intelligence (AI) infrastructure weighed on the sector.
The selling intensified on Friday, October 16. Four of the five stocks closed with double-digit daily losses, while MARA fell just under 10%.
IREN and MARA Lead Bitcoin Mining Stock Losses
IREN recorded the steepest decline in the group. The stock closed Friday at $26.99, down 11.19%, after touching a session low of $26.55.
The drop capped a 23.30% weekly loss and came after Morningstar cut its IREN price target to $37 from $43, citing rising debt-cost risks and intensifying competition from hyperscalers, the largest cloud computing operators.
MARA closed at $7.53, down 9.60% on Friday. Its five-session decline of about 22% ranked second among the group.
CleanSpark ended Friday at $8.40, down 10.16%, taking its weekly loss to about 20%. Hut 8 closed at $67.75, down 10.96%, for a weekly decline of about 19.6%.
Riot fell 11.48% to $13.72 on Friday. The stock dropped 9.42% on Wednesday, October 14, rebounded 2.65% on Thursday, October 15, and finished the five sessions down 18.74%.
Hot CPI Print Sets Off the Selloff
Pressure began on Wednesday, October 14, when the US Bureau of Labor Statistics (BLS) released the September Consumer Price Index (CPI), the main US gauge of consumer inflation. Headline inflation rose to 3.7% year-over-year from 3.4% in August, while the monthly index climbed 0.6% on a seasonally adjusted basis. Gasoline prices rose 9.1% during the month and accounted for more than half of the monthly increase.
The annual figure came in above the 3.6% market consensus. Core CPI, which excludes food and energy, rose 2.6% against a 2.5% forecast. Market-implied odds of a Federal Reserve rate hike in October jumped to 47% from 21% after the release.
Crypto-linked stocks fell during the session, with IREN down 12.10% at $30.59 in afternoon trading. Bitcoin and Ethereum also declined after the inflation data.
Additionally, brokerage revisions on Friday added to the decline. Cantor Fitzgerald lowered its Riot price target to $24 from $30. The firm also cut its Hut 8 target to $151 from $180, while maintaining an Overweight rating.
AI Debt Concerns Spread From Neoclouds to Miners
AI infrastructure stocks sold off sharply on the same day. CoreWeave (CRWV), which rents graphics processing unit (GPU) capacity to AI developers, fell more than 15.5% amid concerns over its debt load, while Oracle (ORCL) closed 8.8% lower. The Nasdaq Composite was down about 1.9% in afternoon trading, as CoreWeave’s unsecured bonds yielded about 15%.
Also on October 14, research and advisory firm Gartner said more than $3.5 trillion of AI infrastructure spending could be exposed to impairment by the end of 2030. The firm also predicted that cost pressure and a lack of differentiation would force over 80% of neocloud providers, specialized companies that sell GPU computing capacity as a service, to cease independent operations by 2030.
Bitcoin miners are exposed because several have signed large AI and high-performance computing (HPC) contracts. IREN, for example, signed a five-year GPU cloud services contract with Microsoft in November 2025, valued at about $9.7 billion. Hut 8 is developing a Texas data center linked to Anthropic’s $35 billion cloud agreement with Nvidia-backed Lambda. Such projects are capital-intensive, and higher interest rates raise the cost of financing them.
Why Bitcoin Miners Now Trade Like AI Infrastructure Stocks
Many miners have spent the past two years converting power-rich mining sites into data centers for AI customers. As a result, their shares now respond to AI financing sentiment while remaining sensitive to Bitcoin’s price.
Grayscale reflected that shift in September when it converted its Bitcoin Miners exchange-traded fund (ETF) into the Grayscale AI Compute ETF (GCPU). Hut 8, IREN, MARA, Riot, and CleanSpark remain among the fund’s top 10 holdings, with weights ranging from 4.5% to 8.1%.
Ethereum co-founder Vitalik Buterin posted cost tables on October 17 showing that Bitcoin mining costs are split roughly evenly between hardware capital expenditure (capex) and electricity. AI inference, the process of running a trained AI model to generate outputs, is dominated almost entirely by hardware capex. Buterin’s comparison helps explain why miners with large power contracts have pursued AI hosting deals.
What Comes Next for Bitcoin Mining Stocks
Bitcoin held near $81,000 on Monday, October 19. The next US inflation reading, October CPI, is scheduled for November 10, while Hut 8 is set to report quarterly earnings on November 4.
Whether last week’s drawdown proves a short-term risk-off reset or a lasting reassessment of AI pivot economics will likely depend on Bitcoin’s direction, credit conditions, and how quickly contracted AI revenue turns into reported earnings.
Also Read: Bitcoin Price Today: BTC Coils Near $82,500 as Daily Bollinger Bands Reach Multi-Year Tightness
