"Risky" doesn't mean "bad investment". All the AI companies are high risk, high reward plays, and their interest rates will reflect that.

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Yes but it removes some groups of otherwise-investors, meaning there is less interest in stocks, which pushes them up less, if not down

This is a bond rating. It has no direct bearing on their stock.

If they can't raise capital then yes that will have a huge impact on a company that's a massive tower of financial engineering as coreweave have been learning.