36 US Stocks Slide in Broad Risk-Off Session; Semiconductors and AI Names Lead Declines

The Quick Take

• SiTime (-12.2%), Skyworks Solutions (-10.3%), SMCI (-8.4%), Entegris (-8.4%), Fabrinet (-7.7%), and KLA Corp (-6.4%) led the semiconductor selloff
• ASML Holding fell 7.2% despite a GF Score of 94, signalling sentiment-driven pressure on fundamentally strong names
• Gartner surged 9.7%, Coinbase gained 9.2%, Guidewire added 8.6%, and Autodesk advanced 7.8%, showing selective demand within the broader decline
• The selloff cut across sectors — tech, financials, energy, mining, and industrials — with 36 companies posting moves of 3–12% in a single session

A wide-ranging equity session on September 15 saw 36 US-listed companies post significant price swings, with semiconductor and technology equipment names bearing the heaviest selling. SiTime Corp fell 12.2%, Skyworks Solutions dropped 10.3%, and both Super Micro Computer and Entegris lost 8.4%. ASML Holding — the Dutch lithography monopoly critical to global chip manufacturing — declined 7.2% despite holding a GuruFocus composite quality score of 94, one of the highest in the batch. The breadth and magnitude of these moves point to a macro or thematic catalyst rather than company-specific news events affecting individual names.

The declines were not limited to semiconductors. Goldman Sachs fell 4.0%, NRG Energy shed 4.4%, SLB Ltd declined 4.9%, and Western Digital lost 4.5%, collectively illustrating risk reduction across financials, energy, and storage. High-GF-score companies including Fabrinet (score 100), AMETEK (score 98), and KLA Corp (score 91) posted steep losses alongside lower-rated peers, suggesting broad-based selling rather than targeted derisking of weaker balance sheets. Contrarian movers — Gartner, Coinbase, Guidewire, and Autodesk — signal rotation into enterprise software and crypto-adjacent assets even as hardware names sold off sharply.

The convergence of semiconductor equipment leaders ASML and KLA in the same down session creates a read-through for peers AMAT and LRCX, whose upcoming results will confirm whether equipment demand is genuinely softening. Investors should watch the Federal Reserve's September 2026 policy signal as the primary macro variable: any hawkish shift extending rate-sensitive tech de-rating would amplify the current selloff momentum. ASML's next quarterly bookings disclosure and the hyperscaler capex guidance cycle from Microsoft, Google, and Amazon will determine whether AI-infrastructure spending is decelerating or merely pausing ahead of Q4 2026 ramp commitments.

Synthesized from 36 sources.