New Delhi, June 3 -- AI investors have a bad case of FOMO.

Marvell Technology's massive stock rally Tuesday is the latest signal that the "fear of missing out" on artificial intelligence is driving a lot of investors' decisions these days. But when market speculation overtakes a stock's actual fundamentals, the risks of a sharp-and painful-stock reversal become even greater.

After all, just a few words from Nvidia CEO Jensen Huang sent Marvell's shares soaring toward a record close. As the leader of one of the world's most important tech companies, Huang's comments certainly carry a lot of weight with investors who want to want to keep up with stocks they think will benefit from the AI revolution. That's why when Huang said Tuesday that...