Top 20 US stock transactions: Microsoft participates in the establishment of the world's largest AI investment fund. Microsoft, ranked fourth, closed down 1% with a transaction volume of $8.139 billion. On September 17th local time, Microsoft announced on its official website that it has reached a global AI infrastructure investment partnership with BlackRock, Global Infrastructure Partners, and MGX. This partnership aims to raise investment funds to build and expand data centers and energy infrastructure to meet the growing computing and energy demands of AI.