These 2 Stocks Have Skyrocketed in 2026. Here’s Why I’d Stay Away

Oct 29, 2026
these-2-stocks-have-skyrocketed-in-2026.-here’s-why-i’d-stay-away

Prosper Junior Bakiny, The Motley Fool

5 min read

It’s not that rare to see stocks in the volatile biotech industry that quadruple (or more) in value over a relatively short period. That’s what has happened to Moderna (NASDAQ:MRNA) and Iovance Biotherapeutics (NASDAQ:IOVA) this year. Shares of the former are up 570%, while the latter has gained 433%. The question for investors is whether these companies are still worth investing in after their impressive runs this year. My view is that they aren’t. Here is why.

Scientist in safety glasses and blue gloves examines a sample under a microscope in a modern laboratory.

Image source: Getty Images.

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1. Moderna

Moderna achieved a significant milestone this year. The company reported positive Phase 3 results for intismeran autogene in certain patients with melanoma. Intismeran autogene is an investigational personalized cancer vaccine, a category of products designed to target mutations specific to patients’ own tumor cells.

This factor could lead to improved efficacy and long-lasting immunity. And until Moderna’s recent achievement, no such candidate had posted strong Phase 3 clinical trial results. So, this was a breakthrough for the biotech leader, and intismeran autogene should become a commercial success.

However, Moderna’s shares may have risen too much, too fast following this clinical win. The company’s market cap is now $77 billion. Do intismeran autogene’s prospects justify that? In my view, even taking into account Moderna’s recently approved influenza vaccine, the answer is no.

Let’s assume Moderna can generate $5 billion in profits by 2031, and suppose we require a 12% rate of return. The company would need a forward price-to-earnings ratio of 27.1 by 2031 for its market cap to be justified at today’s levels. Will Moderna really command a forward earnings multiple that high by then, a factor based on expected growth?

For that matter, will the company generate $5 billion in profits by 2031? Note that Moderna developed intismeran autogene with Merck (NYSE:MRK), and the two companies will share the profits from this product equally. And according to some projections, intismeran autogene could generate over $1 billion in annual sales by 2031. For Moderna to rack up $5 billion in profits, it will have to launch more products — its influenza and coronavirus vaccines won’t allow it to make that much. But Moderna could face significant clinical setbacks.

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