Chip Stocks Tumble, AI Doubts Grow Amid Global Chip Sell-Off

A two-wave semiconductor selloff has erased an estimated $1.3-1.4 trillion in chip-sector market cap over June 2026, reigniting the AI bubble debate that markets had largely dismissed through the first half of the year. The first wave was triggered on June 3-4 when AVGO reported Q3 AI chip sales guidance of $16 billion — below the $17.2 billion analyst estimate — and CEO Hock Tan declined to raise full-year AI revenue guidance, a signal interpreted as a plateau in hyperscaler AI chip orders. The Philadelphia Semiconductor Index, which had surged 65% year-to-date, fell more than 6% in a single session.

The second wave hit June 23 when South Korea's KOSPI dropped nearly 10%, its steepest one-day decline in months, with SK Hynix and Samsung each falling 12% on supply chain concerns. The reverberations were immediate: AMD fell 5-11%, INTC declined a similar range, and NVDA slid 3-6% across the two episodes. Michael Burry, citing the Philadelphia Semiconductor Index's 65% YTD gain, published a bubble warning comparing current conditions to "the final months of the 1999-2000 dot-com bubble". Morgan Stanley's Andrew Slimmon countered by calling the volatility "healthy" and "necessary to wash out speculators." Dan Ives of Wedbush maintained that today's chip leaders are fundamentally different from 1999-era names — generating hundreds of billions in cash flow against real infrastructure contracts.

Bulls point to the Micron-Anthropic partnership announced the same week, Micron's earnings report tomorrow expected to show $35 billion in Q3 revenue, and Jensen Huang's statement calling the selloff "a buying opportunity." Bears note that the selloff's pattern — guidance misses triggering outsized multiple compression — mirrors the early stages of prior tech cycle corrections. With rates potentially rising under Warsh's Fed, the cost of holding growth at premium multiples is rising precisely as estimates are being revised lower.