Power providers drop with big tech after DeepSeek sows AI doubts

Shares of Siemens Energy AG slid as much as 22%, erasing their 2025 gains. Sweden’s Munters Group AB, which makes cooling technologies that help manage the immense heat generated by high-performance servers, slumped 14%. In the US, Oklo Inc., the nuclear fission reactor company backed by OpenAI Inc.’s Sam Altman, fell 18% in premarket trading, having surged more than 60% last week.