Europe's STOXX 600 on track for biggest quarterly gain in over five years on AI boost

European shares extended gains Tuesday and were on track for their biggest quarterly advance in more than five years, supported by optimism around artificial intelligence and signs of easing geopolitical tensions in the Middle East. The STOXX 600 rose 0.6% to 639.77 points as of 0804 GMT and was set for a third consecutive month of gains. For the quarter, the index climbed 9.7%, its strongest performance since October 2020. Technology stocks gained 1.7%, on course for their best quarterly result since October 2001, reflecting demand for AI infrastructure. ASML jumped 3.33% while STMicroelectronics and Infineon rose about 3% and 2.7%, respectively. Siemens Energy climbed 5% after reiterating strong AI-equipment demand at a pre-close call. Oil prices eased toward pre-Iran-war levels, and healthcare added 0.9%.