Billionaire investors are warning that the AI boom may be a bubble nearing its breaking point.

Bridgewater founder Ray Dalio says ultra-wealthy insiders selling holdings could trigger a correction.

When major stakeholders lock in gains, broader market sentiment often turns defensive, the article notes.

Investors are raising bubble warnings as tech stocks reach record highs.

Michael Novogratz called the current frenzy the biggest financial bubble of our lifetime.

At forums in Singapore, existential threats joined bubble fears as the AI mood sobered.

Stretched valuations leave less room for error at tech giants with huge capital spending.

Observers advise watching insider selling and quarterly capital spending reports closely.

Read the full article for more details on the AI bubble warnings.