Weekly Market Recap - Friday, 18-Sep

FactSet Evening Market Recap · Sep 18, 2026 · 5m

Major US equity indices were mostly lower this week, though the Nasdaq Composite logged a weekly gain. AI had an up-and-down week with some notable Monday and Tuesday softness coming after Anthropic's Dario Amodei last weekend released a call for a slower pace of frontier evolution, citing cybersecurity concerns and worries about unchecked recursive self-improvement. The FOMC this week hiked rates by 25 bps, as had been widely expected, though the tone was more hawkish than anticipated.