Alphabet, Meta, and Microsoft reported mixed quarterly results, fueling sector volatility ahead of Apple and Amazon’s earnings due Thursday evening. Analysts said the collective performance of Big Tech continues to shape US equity sentiment and short-term trading flows. Alphabet’s strong ad revenue offset Meta’s tax-related weakness and Microsoft’s AI spending pressure. Investors remain attentive to earnings surprises as technology leadership guides broader index movement amid monetary-policy uncertainty, institutional portfolio rotations, and rising year-end positioning among large-cap growth funds and hedge strategies.