The stock market is about to care about the calendar

Core Insights - The stock market is influenced by year-end tax loss harvesting and portfolio adjustments as the holiday season approaches [1][2] - Significant gains in the stock market have been driven by AI-related trades, with some investors considering profit-taking and tax strategies [2][6] Company Performance - Companies like Palantir (PLTR) and Robinhood (HOOD) have seen substantial year-to-date stock gains, while the worst performers in the S&P 500 are under scrutiny as investors look to mitigate losses [3][5] - The worst-performing stocks include names from various sectors such as consumer, industrial, and services, with examples like Lululemon (LULU), Dow (DOW), and Trade Desk (TTD) [5][6] Market Dynamics - The struggles of underperforming companies are attributed to execution issues, changes in customer demand, and cyclical factors rather than the rise of generative AI [6][7] - Despite the overall positive impact of AI on many companies, tax loss harvesting may increase selling pressure on underperformers, potentially exacerbating their declines [7][9]