Why is AP Moeller - Maersk stock surging today?

Recent market activity shows a broad surge across multiple stocks, including AP Moeller - Maersk, Capricor Therapeutics, Western Digital, Techprecision, Alpha Cognition, Li Bang International, Onfolio, Boost Run, Super League Enterprise, Micron Technology, Aehr Test Systems, and Michael Page. Conversely, Octave Intelligence experienced a slump. Notably, Reddit shares are surging following the announcement by S P Dow Jones Indices that the social media platform will join the prestigious S P 500 Index, providing a significant boost to RDDT.