Shares of BioNTech SE ( BNTX ) – ADR fell 5.7% to $115.84 on Monday, part of a broader decline in vaccine stocks triggered by Moderna's updated revenue guidance for 2025, which fell below analyst expectations.

What To Know: Moderna, whose stock plunged 23% Monday morning, projected revenues of $1.5 billion to $2.5 billion, well short of the $2.95 billion consensus, citing weaker demand for its Spikevax COVID-19 vaccine and RSV vaccine.

The announcement has intensified concerns across the vaccine sector, including for BioNTech, whose fortunes remain tied to its COVID-19 vaccine partnership with Pfizer.

Investors might be increasingly wary of the long-term growth potential for COVID-19 vaccines, as demand normalizes post-pandemic and new competition emerges.

BioNTech's decline on Monday may reflect broader uncertainty about the ability of vaccine makers to diversify product pipelines and sustain revenues in a highly competitive market.

Read Also: What’s Going On With Kratos Defense & Security Solutions Stock Monday?

How To Buy BNTX Stock

By now you're likely curious about how to participate in the market for BioNTech – be it to purchase shares, or even attempt to bet against the company.

Buying shares is typically done through a brokerage account. You can find a list of possible trading platforms here. Many will allow you to buy ‘fractional shares,' which allows you to own portions of stock without buying an entire share. For example, some stock, like Berkshire Hathaway, can cost thousands of dollars to own just one share. However, if you only want to invest a fraction of that, brokerages will allow you to do so.

In the case of BioNTech, which is trading at $117.8 as of publishing time, $100 would buy you 0.85 shares of stock.

If you're looking to bet against a company, the process is more complex. You'll need access to an options trading platform, or a broker who will allow you to ‘go short' a share of stock by lending you the shares to sell. The process of shorting a stock can be found at this resource. Otherwise, if your broker allows you to trade options, you can either buy a put option, or sell a call option at a strike price above where shares are currently trading – either way it allows you to profit off of the share price decline.

According to data from Benzinga Pro, BNTX has a 52-week high of $131.49 and a 52-week low of $76.53.