Excitement for artificial intelligence (AI) has driven a remarkable 2023 rally in technology stocks. Big tech, illustrated by the Nasdaq-100, is up a staggering 31% since January, outpacing the broader index at 25%.

The momentum continued with enthusiasm in May. Top performers like (NASDAQ: DDOG), Marvell Technology (NASDAQ: MRVL), and Zscaler (NASDAQ: ZS) rose as much as 53% last month.

Is this the start of things to come, or has bullish sentiment morphed into irrational hysteria? I'll break down each stock's recent rally to let you know what's what.

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Source Fool.com