S&P 500 Wobbles as Warsh Puts September Hike Back in Play

New Fed Chair Kevin Warsh used his first Jackson Hole address to signal continued frustration with sticky inflation, and the bond market believed him immediately. That credibility swung the September Fed decision to a genuine coin flip, a shift equity desks were not fully positioned for heading into the long weekend.

For the S&P 500, this repricing matters more than the actual headline print. Higher-for-longer expectations compress the multiple investors are willing to pay for future earnings, especially across richly valued mega-cap growth names that have driven most of this year's index gains.

Traders should watch how rate-sensitive sectors within the index react over the coming sessions, since a hawkish Fed narrative typically tightens financial conditions before it shows up in actual policy action.