Palantir Technologies Inc. experienced a significant stock price drop, falling over 10% on November 18, 2024, marking its worst performance in the S&P 500 for that day. This decline follows a series of insider transactions where key executives, including CEO Alexander Karp and Chairman Peter Thiel, sold substantial amounts of stock. Karp alone sold shares worth $399 million, while Thiel and Karp together have sold over $2.5 billion since mid-September. The stock's performance was also influenced by Palantir's announcement to transfer its listing from the NYSE to Nasdaq, effective November 26, 2024. This move was criticized by a board member who later deleted his X account after suggesting the transfer was aimed at catering to retail investors. Despite the day's downturn, Palantir's stock has had a strong year overall, with the stock up 3% in the overnight markets and down 6% and 7% at different points during the trading day.