Tech led momentum lifts US indices ahead of Halloween as October closes with strong monthly performance

US stock markets rallied into the final trading sessions of October as mega-cap technology names including Amazon, Netflix and Tesla delivered strong investor traction, pushing benchmark indices higher despite macro policy uncertainty. Analysts said the rally reflected earnings resilience, AI infrastructure expectations, and increased flows into risk assets heading into year end. The month ended with weekly and monthly gains anchoring bullish sentiment positioning. Traders highlighted tech sector leadership as a structural thematic advantage as cross asset volatility remained controlled across major US benchmarks.