Brutal September: S&P -9.3%, worst since March 2020

September 2022 was the most brutal single month of the 2022 bear market. The S&P 500 fell 9.3% on the month, the worst September since 2008 and the worst single month since the March 2020 COVID crash. The triggers were twofold: the September 13 CPI shock (8.3% vs 8.1% expected, core reaccelerating to 6.3%) and the September 21 FOMC delivering a third consecutive 75bp hike with an updated dot plot showing terminal rate near 4.60%.

Cross-asset pain was broad and intense. The 10Y Treasury yield surged to 3.83% from 3.20% at month-start, its largest monthly increase since 2008. The 2Y yield rose to 4.28%, a new cycle high. The dollar strengthened 3.2% (DXY closed at 112.12), hitting multi-decade highs against the yen (145), pound (1.05 after UK mini-budget crisis), and euro (0.9804 at parity's violation). Long-duration bonds cratered: TLT -14% on the month, one of the worst months in the ETF's history.

Equities were correlated lower across regions and sectors. European equities underperformed as energy crisis and UK gilt crisis compounded. Emerging markets fell sharply. Even gold declined 3% despite high inflation, as real yields crushed gold's fundamental driver. The month's character embodied the "everything selloff" risk of rising real rates: no asset class provided meaningful diversification. Bitcoin closed at $19,431, down 3% on the month but trading below $20,000 after the June breakdown.