In the first half of 2025, major technology and semiconductor stocks have shown varied performance in the S&P 500. Advanced Micro Devices (AMD) led gains with a 19.2% year-to-date increase and a weekly rise of 12.1%. Nvidia (NVDA) also posted strong results, up 14.1% year-to-date and 9.6% for the week. Microsoft (MSFT) gained 17.7% year-to-date and 3.9% weekly, while Meta Platforms (META) outperformed with a 25.3% year-to-date increase and a 7.5% weekly gain. Other notable performers include Uber (UBER) with a 9.3% weekly rise, Amazon (AMZN) up 1.8% year-to-date and 6.5% weekly, and Broadcom (AVGO) with a 16.2% year-to-date increase. Conversely, Apple (AAPL) declined 19.7% year-to-date and was nearly flat weekly (+0.1%), Google (GOOGL) dropped 3% year-to-date but gained 7.1% weekly, and Palantir Technologies (PLTR) fell 4.8% over the week. Tesla (TSLA) showed modest gains of 0.5% weekly. Taiwan Semiconductor Manufacturing Company (TSM) and Berkshire Hathaway (BRK.B) also posted positive year-to-date returns of 15.7% and 7.2%, respectively. Investors are focusing on key stocks such as Google, Robinhood (HOOD), and AMD as part of watchlists for their potential in the evolving AI economy. The S&P 500 index ($SPY) and Nasdaq 100 ($QQQ) remain central benchmarks for market performance discussions.