The Nasdaq-100 Index, Aug. 29 -- Five companies set the week's direction. One central banker changed the Friday.

the benchmark that tracks the 100 largest non-financial companies listed on Nasdaq and serves as the underlying for trillions of dollars in ETFs, options, and futures contracts - closed Friday roughly 0.5% lower after Federal Reserve Chair Kevin Warsh's debut Jackson Hole address raised the probability of a September rate increase to 57%. For the week, the index posted a 0.9% gain, a number built almost entirely by NVIDIA Corporation's blowout second-quarter fiscal 2027 earnings report.

The Nasdaq-100's concentration story is among the most significant structural facts in global equity markets in 2026. Apple Inc. accounts for...