Bitcoin-mining stocks dropped as much as 12.64% on Wednesday after a hotter-than-expected US inflation report triggered the sharpest broad-market selloff since July. The decline was not an isolated reaction to Bitcoin: investors sold technology, artificial-intelligence and data-center shares at the same time, while concern about potentially higher Federal Reserve rates hit companies that need large amounts of capital.
What happened in the market
The S&P 500 fell 1.1%, its largest one-day decline since July 29. The Nasdaq Composite dropped 1.9%, its biggest fall since July 23, while the Dow Jones Industrial Average slipped 0.1%. Bitcoin miners ranked among the session’s worst-performing groups.
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| Company | One-day decline |
|---|---|
| TeraWulf | 12.64% |
| Core Scientific | 12.44% |
| Cipher Mining | 12.35% |
| IREN | 12.20% |
| Riot Platforms | Declined |
| Bitdeer Technologies | Declined |
| MARA | Declined |
| CleanSpark | Declined |
The listed percentage losses are one-session moves, not changes in companies’ underlying production or revenue. They also describe the US trading session, rather than Bitcoin’s spot price by itself.
Why inflation caused the selloff
September CPI exceeded expectations
Consumer prices rose 3.7% in September 2026 from a year earlier, above the 3.6% economist consensus and well above the Federal Reserve’s 2% inflation target. Higher gasoline prices, which the report linked partly to the war in the Middle East, helped produce the upside surprise.
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Rate-hike odds moved higher
The inflation data briefly pushed the market-implied probability of an October Federal Reserve rate hike above 50%, although that probability later retreated. A higher expected policy rate generally reduces the value investors place on companies whose profits are expected far in the future, because future cash flows are discounted more heavily.
San Francisco Federal Reserve President Mary Daly urged patience rather than an immediate decision: “I don’t feel urgent that we have to decide with a limited set of information. I think we have the time that we need.” Her comments indicate that officials were still weighing incoming evidence even as the inflation report increased pressure for additional tightening.
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Why bitcoin miners fell more than the broad market
Mining is capital-intensive
Bitcoin mining requires continual spending on specialized computers, electricity, cooling systems and facilities. Expansion projects can therefore depend on debt or other external financing. When interest rates rise, new borrowing becomes more expensive, refinancing can cost more and projects may generate lower returns after financing costs.
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Many miners now have technology exposure
Several mining companies are pursuing artificial-intelligence infrastructure and data-center services in addition to producing Bitcoin. That strategy gives them another potential source of revenue, but it also ties their share prices to the same financing and valuation pressures affecting technology companies.
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During the session, CoreWeave fell 16%, Nebius declined 11% and Oracle dropped 9%. PRISM’s AI Data Center and Infrastructure Index fell in 21 of its 23 tracked stocks, with an average loss of 7.46%. The simultaneous weakness helps explain why miners with data-center ambitions were treated more like high-growth technology companies than like narrowly focused commodity producers.
How the affected companies differ
| Company group | Observed drawdown | What drove sensitivity in this session |
|---|---|---|
| TeraWulf, Core Scientific, Cipher Mining and IREN | 12.20% to 12.64% | Mining exposure combined with sensitivity to technology valuations and project financing |
| Riot Platforms, Bitdeer Technologies, MARA and CleanSpark | Declined; an individual percentage loss was not stated | Exposure to Bitcoin-mining economics and the broader risk-off move |
| Miners expanding into AI or data centers | Among the hardest-hit mining shares | Large capital requirements, debt costs and correlation with AI-infrastructure stocks |
The table does not establish that one company has a permanently higher debt burden or a specific level of AI revenue. It shows how investors grouped these businesses during this particular trading session.
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How higher Fed rates can affect mining companies
- Financing costs rise: variable-rate debt and new loans can become more expensive.
- Expansion returns shrink: a data-center or mining build-out must earn more to justify its capital cost.
- Equity valuations compress: investors often pay lower multiples for growth expected years in the future.
- Refinancing risk increases: companies with debt maturities may face less favorable terms when they replace existing borrowings.
- Risk appetite weakens: investors may move from speculative growth shares toward assets perceived as less sensitive to rates.
These effects do not guarantee that every miner will fall whenever rates rise. A stronger Bitcoin price, improved mining efficiency, lower electricity costs or successful data-center contracts could offset some pressure. The Wednesday move shows the market’s immediate reaction to macroeconomic risk, not a complete forecast of each company’s operating results.
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- Additional US inflation readings and gasoline-price trends.
- Federal Reserve statements and market expectations for the October meeting.
- Debt levels, interest expense and refinancing schedules in miners’ filings.
- Capital spending plans for mining sites and AI or data-center projects.
- Bitcoin’s price, network difficulty, electricity costs and operating efficiency.
The key distinction is between a broad risk-off day and a company-specific breakdown. Wednesday combined both: inflation lifted rate concerns across Wall Street, while miners’ capital needs and expanding technology businesses amplified the selling.
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The bottom line
Bitcoin miners plunged because a 3.7% September inflation reading revived fears that US interest rates could stay higher or rise again. The S&P 500 and Nasdaq were already falling sharply, and miners were hit harder because they combine volatile Bitcoin exposure with capital-intensive operations and, in some cases, AI-infrastructure ambitions. TeraWulf, Core Scientific, Cipher Mining and IREN each lost more than 12% in the session.
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