Here are the biggest calls on Wall Street on Tuesday: JPMorgan downgrades Goldman Sachs to neutral from buy JPMorgan sees a more balanced risk/reward for the investment bank. "We downgrade GS to Neutral from OW. We see GS shares as fairly valued now. GS has demonstrated strong market share improvement in its Sales and Trading business over the last few years and the franchise has been refocused on its strengths in Global Banking and Markets as well as Asset and Wealth Management." Read more. Cantor Fitzgerald reiterates Tesla as overweight The firm says it's bullish ahead of Tesla earnings on Wednesday. "Above all, we will be focusing on Elon's commentary, particularly updates on the timing of several upcoming key material potential near-term catalysts, including: continued rollout of Robo

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