CNBC's Jim Cramer unpacked Thursday's market action and worried about declines in the broader tech sector, suggesting insider selling in certain companies is reminiscent of the dotcom era.

"Today was a hideous day, but particularly for tech, most especially the data center and AI stocks. See, the money's headed to the sidelines or headed to high growth away from tech," he said. "I don't want to abandon the truly profitable companies involved in AI — and [the CNBC Investing Club's Charitable Trust] hasn't – but I know a mania when I see one, and this one feels like it's starting to unwind."

Cramer said he's become more cautious about speculative stocks connected to artificial intelligence and the data center over the past few months, indicating that investors can no longer make easy m

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