Here are the biggest calls on Wall Street on Tuesday: KeyBanc reiterates Vistra Energy as buy Key says it's bullish on the power generation company. "We are initiating coverage on Vistra Corp. (VST) with an Overweight rating and a $217 price target." TD Cowen reiterates Nvidia as buy The investment bank says it's even more bullish on the stock after meeting with company management. "We had the opportunity to meet with NVIDIA EVP & CFO Colette Kress on our semiconductor, semicap, and networking bus tour. ... .We came away from our meeting incrementally confident in the company's growth prospects for C2026+." Raymond James upgrades CDW as strong buy from outperform Raymond James says it sees several catalysts ahead for the IT services management company. "We are upgrading CDW to Strong Buy f

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