Here are the biggest calls on Wall Street on Thursday: Jefferies reiterates Walmart as buy Jefferies sees a $20 billion AI and automation opportunity for Walmart. Goldman Sachs upgrades Roblox to neutral from sell Goldman upgraded the stock following its earnings report and sees "margin momentum." Needham upgrades Disney to buy from hold Needham upgraded the theme park operator after its earnings report, seeing "strong" earnings per share growth. Morgan Stanley downgrades American Express to equal weight from overweight Morgan Stanley downgraded the credit card stock mainly citing valuation. Wells Fargo reiterates Disney as overweight Wells says it's standing by its overweight rating on the stock following earnings on Wednesday. "

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Persons: Jefferies, Morgan Stanley downgrades Hertz, Morgan Stanley, Goldman Sachs, Goldman, Needham, Ally, it's, Wells, Macquarie, BABA, Oppenheimer, Davidson, NYCB, Guggenheim, TD Cowen, Wedbush, Wolfe, Baird, Tesla Organizations: Walmart, Discover, DFS, Barclays, PNM Resources, New, Express, DIS, Six, York Community Bancorp, Guggenheim, UBS downgrades Air Products, UBS, Products, Deutsche Bank, AstraZeneca, Deutsche, Apple, Nvidia Locations: New Mexico, Texas, OW, North America, China, GPRO