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Why Is Jazz Pharmaceuticals (JAZZ) Stock Soaring Today

By: StockStory
November 17, 2025 at 11:41 AM EST

JAZZ Cover Image

What Happened?

Shares of biopharma company Jazz Pharmaceuticals (NASDAQ: JAZZ) jumped 18.3% in the morning session after the company announced positive top-line results from its Phase 3 HERIZON-GEA-01 trial for its cancer drug, Ziihera. 

The study tested Ziihera as a first-line treatment for patients with a type of advanced or metastatic gastroesophageal cancer. The trial found that Ziihera, when used with chemotherapy, led to statistically significant and clinically meaningful improvements in progression-free survival compared to the current standard treatment. This means the drug helped patients live longer without their cancer getting worse. Furthermore, when Ziihera was combined with chemotherapy and the checkpoint inhibitor tislelizumab, it also showed a significant improvement in overall survival rates. These strong results suggested that Ziihera-based treatments could become a new standard of care for this form of cancer.

Is now the time to buy Jazz Pharmaceuticals? Access our full analysis report here.

What Is The Market Telling Us

Jazz Pharmaceuticals’s shares are not very volatile and have only had 9 moves greater than 5% over the last year. Moves this big are rare for Jazz Pharmaceuticals and indicate this news significantly impacted the market’s perception of the business.

The previous big move we wrote about was 6 days ago when the stock gained 2.8% on the news that the market experienced a sharp sector rotation, as investors fled growth-oriented technology stocks and piled into value-oriented names amid growing valuation concerns. 

This divergence was stark: the tech-heavy Nasdaq struggled, losing 0.2%, while the Dow rallied. This shift away from tech was triggered by a series of negative catalysts in the AI sector. AI cloud provider CoreWeave slid on disappointing guidance, while chip darling Nvidia pulled back after SoftBank sold its stake. This "hurt the AI trade," dragging down related names like Micron and Oracle. As capital left tech, it sought safety in "higher quality" defensive names. Health care giants like Merck, Amgen, and Johnson & Johnson saw significant buying, boosting the Dow.

Jazz Pharmaceuticals is up 37.2% since the beginning of the year, and at $169.73 per share, has set a new 52-week high. Investors who bought $1,000 worth of Jazz Pharmaceuticals’s shares 5 years ago would now be looking at an investment worth $1,160.

Microsoft, Alphabet, Coca-Cola, Monster Beverage—all began as under-the-radar growth stories riding a massive trend. We’ve identified the next one: a profitable AI semiconductor play Wall Street is still overlooking.Go here for access to our full report.

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