 The U.S.-listed shares of ASML Holding N.V. ASML, 13.07 ASML, 9.74 shot up 12.8 toward the biggest one-day gain in 20 years in midday trading Thursday, after the Netherlands-based semiconductor equipment maker set a new 12 billion euro 12.2 billion stock buyback program, and as part of a broad rally in the chip sector and the stock market. 