Shares of BioNTech (NASDAQ: BNTX) were sinking 10.4% as of 3:18 p.m. EST on Tuesday. The decline came after Bank of America analyst Tazeen Ahmad downgraded the stock to a neutral rating from a buy.
It's best not to place too much emphasis on Wall Street analysts' upgrades and downgrades, although understanding the reasoning behind their views can be helpful.
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Source Fool.com