Key Highlights

  • Michael Burry said Anthropic's valuation could buy 78 profitable S&P 500 companies, a comparison made in public posts on October 8, 2026 that is a claim, not an audited figure.
  • Ray Dalio renewed an AI bubble warning the same day, adding a second well-known voice to concerns about technology valuations and the spending behind artificial intelligence.
  • Technology Select Sector SPDR Fund (NYSEARCA:XLK) holds large US technology companies, so valuation worries about AI spending bear directly on its largest positions, though the fund also holds software and hardware firms outside AI.
  • The Nasdaq Composite fell 1.25% on October 8, 2026, and the 10-year Treasury yield touched about 5.35% intraday, so the warnings landed on a nervous tape.

What Burry and Dalio Said

On October 8, 2026, Michael Burry argued in public posts that Anthropic's private valuation could buy 78 profitable S&P 500 companies. The statement compares one private company's price with a group of earning public businesses, and it depends on the valuation used, which is not audited. Ray Dalio separately renewed his warning that AI enthusiasm has the marks of a bubble. Both are opinions on social media, not filings, and both investors have been early or wrong before, as all forecasters have. Anthropic is private and has no ticker, so the claim cannot be traded directly. Readers should treat the 78 companies figure as an illustration of scale, not as a measured fact about earnings or price-to-earnings multiples.

Why Valuation Warnings Matter Now

Bubble talk matters more when money is expensive. Treasury yields touched about 5.35% on the 10-year note, near the highest since 2002, which raises the return investors can earn without taking equity risk and makes long-dated growth stories look less attractive by comparison. At the same time, OpenAI reportedly told investors its annualized revenue was about USD 50 billion, below earlier reports of USD 68 to 70 billion. Technology Select Sector SPDR Fund (NYSEARCA:XLK) is a basket of large technology firms, so its results depend on whether AI spending turns into profits. The fund spreads company risk but does not remove sector risk, and its largest holdings can dominate its daily result.

Risks and What to Watch

Warnings are not forecasts of timing. Bubbles can last longer than skeptics expect, and strong earnings can justify high prices. The counter-risk is that funding for AI projects tightens when yields are high and revenue disappoints. Watch third-quarter earnings from large technology companies later in October, the Federal Reserve meeting on October 27 and 28, and any update on AI company revenue, which would show whether spending is paying off. Investors holding Technology Select Sector SPDR Fund (NYSEARCA:XLK) should check how concentrated the fund is in its top holdings and compare it with equal-weight alternatives. They should also remember that valuation alone has rarely been a reliable timing tool.

Where Things Stand

The warnings are getting louder, but loud is not the same as right. Burry and Dalio gave opinions, and the market data on October 8, 2026 showed a reaction to yields and OpenAI revenue more than to either post. Technology Select Sector SPDR Fund (NYSEARCA:XLK) is the kind of instrument that would feel any valuation reset, though it has not been shown to fall because of these posts. Earnings and the Fed meeting on October 27 and 28 will say more than commentary.