VIENNA, June 15 : Austrian circuit board manufacturer AT&S has announced it is investing up to €2 billion ($2.3 billion) in Malaysia to capitalise on the AI boom, sending its shares soaring nearly 30 per cent. "We will fully expand our site in Kulim," the company's CEO Michael Mertin told Reuters in an interview on Monday. The company announced on Saturday it would expand capacity in Kulim and raised its outlook for 2026/27, citing agreements with its customer AMD, the U.S. chipmaker, and