Stock market today: Dow, S&P 500, Nasdaq falter amid worries over frothy valuations

Market Overview - US stocks experienced a decline, with the tech-heavy Nasdaq Composite falling approximately 0.9%, the S&P 500 down about 0.6%, and the Dow Jones Industrial Average dipping 0.2% [1][3] Investor Sentiment - There is growing concern among investors regarding whether companies can sustain their high market valuations, leading to warnings from big bank CEOs about a potential market correction [2][3] - Skepticism is emerging about the durability of the tech-driven rally, despite strong earnings reports [3] Company Performance - Palantir's shares dropped over 6.8% following solid quarterly results, as analysts raised concerns about its high price-to-earnings ratio [2] - Uber reported strong results, but its shares declined, indicating that investors were expecting even better performance [4] Upcoming Earnings Reports - Attention is focused on AMD's earnings report, particularly regarding its significant AI deals, along with reports from Spotify and SuperMicro [4] External Factors - The US government shutdown has reached its 35th day, tying the record for the longest shutdown in history, which is delaying the release of key economic data important for the Federal Reserve and Wall Street [5]