AI and semiconductor stocks are dropping sharply, and one closely watched gauge has now crossed into bear-market territory.

According to finance.biggo.com, the Philadelphia Semiconductor Index — a benchmark that tracks major chipmakers — has entered a bear market, meaning it has fallen at least 20% from a recent high. In the same report, Taiwan Semiconductor Manufacturing Company (TSMC), which produces chips for many of the industry's biggest names, saw its U.S.-listed shares (ADR) drop nearly 3%. Nvidia, the report notes, only narrowly held onto its title as the world's most valuable company by market cap.

The pressure extends beyond chips. WREG.com reports that AI stocks broadly keep falling, even as oil prices keep climbing — a split that points to investors rotating away from high-flying technology names.

Not everyone sees the decline as a reason to flee. The Globe and Mail, in an analysis also carried by MSN, points out that in this cycle, buying chip stocks after a 20% drawdown has usually paid off for investors. The piece frames the current AI-driven selloff as a possible buying opportunity — while openly asking whether that pattern will hold this time.

Taken together, the sources describe a market wrestling with how much the AI boom is worth. Chipmakers like Nvidia and TSMC have been among the biggest winners of the AI surge, so a sharp reversal in their shares tests whether those gains were built on solid ground.

Why it matters: because AI and chip stocks now carry enormous weight in major indexes, a slide in these names can ripple through retirement accounts and the broader market far beyond the tech sector.