04:22 PM EDT, 09/22/2025 (MT Newswires) -- US equity indexes ended higher on Monday as benchmark gauges extended rallies to records, driven by tech stocks.

* Nvidia ( NVDA ) and Microsoft ( MSFT ) -backed OpenAI announced a letter of intent for the chipmaker to invest up to $100 billion in the AI startup, enabling OpenAI to build and deploy at least 10 gigawatts of AI data centers powered by Nvidia ( NVDA ) chips, with details to be finalized in the coming weeks. Nvidia ( NVDA ) shares rose 4%.

* The Chicago Fed National Activity Index, a monthly measure of economic activity, improved to minus 0.12 in August from minus 0.28 in July.

* October West Texas Intermediate crude oil fell $0.04 to settle at $62.64 per barrel, while November Brent crude, the global benchmark, was last seen down $0.11 to $66.58.

* Oracle (ORCL) will secure the algorithm for a new US version of TikTok as part of a deal to sell the Chinese-owned app to American investors, Bloomberg reported, citing a White House official. The company also announced the promotion of Clay Magouyrk and Mike Sicilia to co-chief executive officers, while Safra Catz transitions to the role of executive vice chair on the board. Oracle shares jumped 6.3%.

* Compass (COMP) shares fell 16% after the company agreed to acquire Anywhere Real Estate ( HOUS ) in an all-stock deal. Anywhere Real Estate ( HOUS ) surged 46%.