Our top 10 things to watch Tuesday, Sept. 23 — Matthew J. Belvedere wrote this morning's newsletter with the help of Jeff Marks. 1. The S & P 500 was relatively flat Tuesday morning following a three-session winning streak. The index closed at a record high Monday, and so did the Nasdaq as tech stocks surged on Club holding Nvidia's gains after its OpenAI announcement . Looking ahead , Club name Costco reports earnings after Thursday's close, and the Federal Reserve's favorite inflation gauge is out Friday morning. 2. Nvidia's $100 billion investment to help OpenAI build AI data centers followed one-on-one negotiation s between the CEOs of the two companies. Jim Cramer said he spoke to Nvidia's Jensen Huang after the deal was announced yesterday. "Jensen told me that Sam was the first to r

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