Key Highlights

  • IREN (NASDAQ:IREN) fell 7.7% on October 8, 2026, the largest decline in a group of Bitcoin miners and AI data-center stocks that sold off as the OpenAI Revenue gap hit infrastructure names.
  • Cipher Mining (NASDAQ:CIFR) dropped 7.3% in the same session, and the closes come from market data that should be rechecked against official prices before use.
  • MARA (NASDAQ:MARA) fell 4.3%, a smaller drop that reflects its heavier tie to bitcoin than to AI hosting, while TeraWulf lost 5.2% as the fourth name in the group.
  • Bitcoin (BTC) dipped to about USD 80,000 in the same session, which pressured miners from both the AI side and the crypto side at the same time.

The Selloff

On October 8, 2026, high-beta AI and Bitcoin Mining stocks fell hardest. IREN (NASDAQ:IREN) lost 7.7%. Cipher Mining (NASDAQ:CIFR) fell 7.3%. TeraWulf (NASDAQ:WULF) fell 5.2%, while MARA dropped 4.3%. The trigger was a report on October 8 that OpenAI told investors its annualized revenue was about USD 50 billion at the end of September, below earlier reports of USD 68 to 70 billion. These companies have shifted capacity from mining toward hosting AI computing for customers, so doubts about AI funding hit their growth plans and their ability to raise money cheaply. Closing moves come from market data and should be rechecked against official prices. High Beta means the stocks move more than the market in both directions.

Why Miners Trade With AI Now

Mining firms own power contracts, land and data-center shells, Assets that are scarce and valuable for AI computing. Several have signed long-term hosting deals or announced projects, which turn their Business from volatile bitcoin revenue into contracted capacity income. The change links their valuations to AI expectations. When IREN (NASDAQ:IREN) and peers fall together, it shows that investors treat them as AI infrastructure plays. Bitcoin (BTC) also dipped to about USD 80,000 with roughly USD 1 billion of leveraged positions liquidated, so the mining side of the business faced pressure at the same moment. Debt used for construction magnifies both gains and losses, which is part of why these stocks fell more than the broad market.

Risks and What to Watch

Risks include delays in building capacity, customer concentration, high debt and financing costs, which rise with Treasury yields near 5.35% on the 10-year. Dilution from share sales can also weigh on prices. Bitcoin price swings affect any remaining mining revenue. IREN (NASDAQ:IREN) and peers may rebound if AI sentiment recovers, but the gap between OpenAI's figures is unresolved and might reflect gross versus net accounting. Watch for company updates on hosting contracts, financing announcements, bitcoin price levels and the Fed meeting on October 27 and 28. Declines of this size in one day are common for the group, and they are not predictions. Readers should compare each stock with its own range.

Where Things Stand

The miners fell because the OpenAI revenue gap raised doubts about the AI hosting contracts and projects that now drive their valuations, and bitcoin weakness added to the pressure on the same day. The exposure is to the AI cycle as much as to crypto. IREN (NASDAQ:IREN) fell the most at 7.7%, and the group dropped between 4.3% and 7.7%. The figures are market closes that need a recheck. The next evidence will be financing updates and signed customer contracts.