EU chipmakers join in on global AI optimism following OpenAI deal

** EU semiconductor stocks rise following South Korean chipmakers' rally on the global AI-driven tech momentum

** Dutch semiconductor equipment maker ASML ASML, ASMI ASM and BESI BESI, all three counting South Korean chipmakers as their customers, gain between 4% and 6%

** OpenAI's partnership with SK Hynix 000660 and Samsung Electronics 005930 spurs broad optimism for semiconductor stocks globally, Bernstein analyst Aleksander Peterc says

** Other notable raisers include Germany's Siltronic WAF, France's Soitec SOI climbing over 4%

** Infineon IFX, Melexis MELE, AMS-Osram AMS, Aixtron AIXA and STMicroelectronics STMPA also gain 2-3%