A fresh sell-off in artificial-intelligence stocks rippled across global markets, pulling indexes lower around the world.

The slump hit Asia hard. According to Japan Today, Asian shares sank with Tokyo down 4% as slumping AI stocks dragged world markets lower. Reports from outlets including WAOW and Salem News described AI stocks resuming their drops and pulling markets down worldwide.

What makes the decline puzzling is that the underlying business news has been strong. According to coverage from The Motley Fool and The Globe and Mail, recent earnings from chipmaker Taiwan Semiconductor (TSMC) and equipment supplier ASML showed soaring demand — yet AI stocks fell anyway.

The disconnect points to a shift in sentiment rather than fundamentals. As Yahoo Finance noted, investors have thought twice over the past few months before buying AI stocks, even as messages from the biggest players in the sector remain positive. In other words, the companies keep signaling confidence, but buyers have grown more cautious about the prices they're willing to pay.

The pullback has also revived debate over where value lies. One commentary highlighted by MSN argued for buying an AI chip stock other than Nvidia during the sell-off, favoring a company that "gets paid either way" regardless of which chip designer ultimately wins.

Broader market jitters may be compounding the mood. Investor's Business Daily flagged geopolitical tension in the same news cycle, reporting an Iran attack that killed two U.S. troops, alongside upcoming results from Google, Tesla and AMD.

Why it matters: AI-linked companies now carry enormous weight in major indexes, so when their share prices swing, the value of ordinary investors' retirement and savings accounts can move with them.