Investors who helped power the artificial intelligence rally are now watching a different warning sign: the market for credit default swaps. Shares tied to the AI boom have already been under pressure, and the latest concern is that bonds issued by major technology companies are also showing strain.

A credit default swap, or CDS, is a financial contract that acts like insurance on debt. If the cost of that protection rises, it usually means investors are becoming more uneasy about the credit outlook for the company behind the bonds. In this case, higher CDS prices for names such as Oracle, Nvidia and Apple are drawing attention.

That does not necessarily mean markets expect these companies to default. But it does show that investors are demanding more protection as risk appetite cools and pressure spreads beyond stock prices into corporate debt. For AI investors, that shift matters because it suggests concerns are no longer limited to lofty equity valuations.

The broader takeaway is that the AI trade is being tested in more than one part of the market. When bond insurance costs climb alongside weaker sentiment in shares, it can signal a more cautious view on the sector’s near-term outlook, even for some of the biggest companies linked to artificial intelligence.