The Taiwan stock market saw a volatile session on May 15, dropping 579.39 points to close at 41,172.36 after hitting a record high of 42,408. Market sentiment shifted due to profit-taking and uncertainties regarding the U.S.-Iran conflict. Tech heavyweights like TSMC and Quanta saw declines, while the number of 'thousand-dollar' stocks shrank. Analysts suggest the market is entering a consolidation phase.