Yahoo Finance·2025-10-31 16:20Core Insights - Amazon shares surged to a record high following better-than-expected earnings, contributing to the rise of major U.S. equity indexes including the Dow, S&P 500, and Nasdaq [1][5] Company Performance - Amazon was a top performer in the S&P 500, leading gains in both the Dow and Nasdaq, with significant growth attributed to its Amazon Web Services segment [2] - Reddit's shares increased sharply after reporting quarterly earnings that exceeded analysts' expectations, driven by a rise in user numbers, particularly internationally [2] - Western Digital experienced a boost in its stock price due to strong demand for data storage hardware supporting artificial intelligence, resulting in better-than-expected quarterly results [3] Market Reactions - Newell Brands saw its shares decline after lowering its full-year outlook, which was partially influenced by tariffs [3][5] - Dexcom's shares fell amid concerns regarding its future outlook and the accuracy of its G7 glucose monitoring system [4]