Key TakeawaysNvidia shares rose Monday, propelling the chipmaker into the top spot on the list of the world’s most valuable companies by market capitalization.Nvidia and Apple, along with software and cloud computing giant Microsoft, have been vying for the title of the world’s most valuable company since the summer. Robust demand for artificial intelligence infrastructure has fueled Nvidia's meteoric rise. Nvidia (NVDA) shares rose Monday, propelling the AI chip leader into the top spot on the list of the ...