Philadelphia Semiconductor Index +75% YTD — Best Pace Since 1999
The Philadelphia Semiconductor Index, which tracks the 30 largest US-listed chipmakers, gained 75% year-to-date through May 2026 — putting it on track for its best annual performance since 1999's dot-com peak, according to Financial Times data. The surge reflects sustained demand for AI hardware across training infrastructure, data center buildout, and inferencing capacity from hyperscalers and enterprise buyers. Micron, TSMC, and Nvidia have all reached or approached valuation milestones this quarter.
Why It Matters
The PHLX's 1999-level surge is both a signal of genuine AI hardware demand and a risk indicator: the comparison to the dot-com era is not lost on analysts watching for signs that semiconductor valuations have outpaced near-term revenue growth.