Key TakeawaysNvidia stock advanced 4.4% Monday, one of the biggest gains in the S&P 500.The gain was due in part to Goldman Sachs reiterating its positive outlook on the company.Goldman was just the latest Wall Street firm to express enthusiasm about Nvidia after the stock's sharp decline earlier this month. Nvidia extended its stock recovery and closed with the fourth-highest gains in the S&P 500 on Monday, as a large Wall Street firm reiterated an optimistic stance on the chipmaker. Goldman Sachs reaffirm ...