S&P 500 Wobbles as Warsh's Hawkish Tone Rattles Wall Street

Wall Street's mood shifted abruptly after Fed Chairman Kevin Warsh used his Jackson Hole platform to voice continued frustration with sticky inflation. The S&P 500 traded defensively as traders repriced the odds of a September rate hike to essentially a coin flip, a sharp change from the dovish expectations priced in just days earlier.

Higher-for-longer rate expectations typically compress valuation multiples across the index, particularly for rate-sensitive growth names that have driven much of the recent rally. Equity desks are now watching whether index futures can hold key support as bond yields adjust to the new policy outlook.

With the Fed's next move genuinely uncertain, the S&P 500 faces a stretch of elevated volatility heading into September's policy meeting.