Here are Friday's biggest calls on Wall Street: Wells Fargo reiterates Tesla as underweight Wells said Tesla shares are overvalued. "Remain UW; Too Much 'Hype' Baked In." Mizuho initiates Viking Holdings as underperform Mizuho said the competition is too tough right now for Viking. "We'd Book the Cruise, Not the Stock; Risk/Reward Skewed: Initiating Underperform." Morgan Stanley reiterates Nvidia as overweight Morgan Stanley said it's sticking with Nvidia. "Our thoughts on the stock: We remain positive on the short- and long-term outlook here, and while the market is more optimistic now vs. 3-6 months ago, we still see the stock climbing a wall of worry from here." BMO upgrades Weatherford as outperform BMO said the drilling company has international reach. "We are initiating coverage of W

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