The Taiwan Stock Exchange suffered a major sell-off on May 15, with the main index dropping 579.39 points to close at 41172.36. Total turnover reached NT$1.31 trillion. Institutional investors were net sellers, offloading a combined NT$36.66 billion. Dealers led the exodus with NT$24.9 billion in net sales, while foreign investors and investment trusts sold NT$10.3 billion and NT$1.3 billion respectively.