S&P 500 Gains and Losses Today: Dell Stock Drops; Google Parent Alphabet Climbs on Bet by Buffett's Berkshire

Group 1: Market Performance - Major U.S. equities indexes declined at the start of the trading week, with the Nasdaq falling 0.8%, the S&P 500 sliding 0.9%, and the Dow dropping 1.2% [2] - Google parent Alphabet was the top performer in the S&P 500, with shares jumping 3% after Berkshire Hathaway disclosed a new stake in the company [6][8] Group 2: Company-Specific Developments - Dell Technologies shares dropped over 8% after Morgan Stanley downgraded the stock to "underweight" due to concerns about rising memory chip prices affecting gross margins [3][8] - Hewlett Packard Enterprise also faced a downgrade from Morgan Stanley, with shares sinking 7% [3] - Generac Holdings saw its shares decline around 7% following weaker-than-expected third-quarter results, attributed to a decline in power outages impacting residential generator sales [5] Group 3: Industry Trends - Rising prices for memory components are expected to pressure margins for several computer hardware manufacturers [3][8] - Google launched AI-enabled travel tools, which negatively impacted shares of competing online travel booking platforms, with Expedia Group losing nearly 8% [9]