AI infrastructure debt costs rise as investors sour on CoreWeave, Oracle and Microsoft

Yields on CoreWeave's bonds rose further, and the cost to insure them is up 150% from a year ago, while its stock fell 28% at one point this week.

Oracle's $160 billion debt is rated just above junk status, and Microsoft's AAA-rated debt costs 25% more to insure than three months ago.

Federal Reserve chair Kevin Warsh says AI is probably the most consequential change to the economy in his lifetime, but the path there will likely be bumpy.