Concerns about returns on AI investments are denting sentiment toward the
mega-cap techs that powered this year's rally. On Tuesday the Nasdaq-100 fell
1.6% and was poised to close in a correction (defined as a 10% decline from the
peak), having reached that threshold in just 38 trading days. By contrast, the
pullback prior to March took more than 100 trading days to fall 10% from its
October 2025 high.