Alphabet, Nvidia upgraded: Wall Street's top analyst calls

Citi initiated coverage of York Space Systems(YSS) with a Buy rating and $37 price target. The stock offers a "high risk/high reward play on the space megatrend," the firm tells investors in a research note. Canaccord, JPMorgan, Wells Fargo, Baird, Goldman Sachs, Jefferies, Raymond James, and Needham also started coverage of the stock with Buy-equivalent ratings, while Truist initiated with a Hold.