What happened BioNTech (NASDAQ: BNTX) shares were having an atypically bad day on Wednesday, and by the close of trading were down by nearly 7%. A downshift in one analyst's recommendation seems to be the latest headwind buffeting the company's stock. So what Analyst Simon Baker at Redburn Securities changed his recommendation on the stock to sell from neutral, tagging it with a $146 per share target price. That's nearly 30% below its current level. Image source: Getty Images. His reasoning, detailed in a research note published Wednesday, is that the sturdy gains the stock has enjoyed since the end of March are not justified by the biotech's most recent guidance or by the considerable revenue the company still stands to take in from the coronavirus vaccine it developed in partnership with Pfizer (NYSE: PFE). Wednesday's investor bearishness was also related to Monday's news from Novavax. The vaccine specialist announced stunningly positive phase 3 clinical trial results for its NVX-CoV2373 COVID-19 vaccine candidate. They showed more than 90% efficacy overall, and 100% against moderate and severe instances of the disease. Now what So basically, it's been a tough week for BioNTech, which perhaps seems as if it's becoming yesterday's coronavirus vaccine news. Yet the pandemic is far from over, and the BioNTech/Pfizer jab is one of the best in class. Meanwhile, the messenger RNA (mRNA) technology used in that shot is only in its beginning stages, promising a bright future for BioNTech -- which has a wide pipeline stuffed with mRNA-based products. 10 stocks we like better than BioNTech SEWhen our award-winning analyst team has a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* They just revealed what they believe are the ten best stocks for investors to buy right now… and BioNTech SE wasn't one of them! That's right -- they think these 10 stocks are even better buys. See the 10 stocks *Stock Advisor returns as of June 7, 2021 Eric Volkman has no position in any of the stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. The Motley Fool has a disclosure policy.Source