Tesla shares experienced a notable decline, closing down 8.3% on December 18, marking the largest drop since October 11. The decline follows a post-election rally, with shares giving up some of the gains made earlier. The stock continued to slide, dropping an additional 5% in pre-market trading on December 20. By midday, Tesla shares were reported at $412, down from $425 the previous day, reflecting a cumulative loss of 13.3% over the week. Analysts attribute the downturn to a broader market selloff and a loss of momentum from the recent rally.