Rock Springs Capital JAZZ Position
Active7-Fund ConvergenceRock Springs Capital initiated a new position in Jazz Pharmaceuticals plc (JAZZ) in Q4 2025, holding $298K worth of shares across 1,750 shares.
JAZZ is a convergence signal: 7 specialist biotech funds hold this stock, suggesting high institutional conviction.
There is an upcoming Phase 2 readout for Nabiximols in 14 days (Apr 30, 2026), making the timing of Rock Springs's position particularly relevant.
Short interest stands at 11.6% of float with 5.5 days to cover, indicating significant bearish positioning against Rock Springs's long thesis.
About Jazz Pharmaceuticals plc
Jazz Pharmaceuticals plc, a biopharmaceutical company, identifies, develops, and commercializes pharmaceutical products for various unmet medical needs in the United States, Europe, and internationally. The company has a portfolio of products and product candidates with a focus in the areas of neuroscience, including sleep medicine and movement disorders; and in oncology, including hematologic and solid tumors. Its lead marketed products include Xyrem, an oral solution for the treatment of cataplexy and excessive daytime sleepiness (EDS) in narcolepsy patients seven years of age and older; Sunosi for the treatment of EDS in patients with narcolepsy and obstructive sleep apnea; Erwinaze to treat acute lymphoblastic leukemia; Defitelio for the treatment of adult and pediatric patients with hepatic veno-occlusive disease; Vyxeos liposome for injection, a product for the treatment of adults with newly-diagnosed therapy-related acute myeloid leukemia; and Zepzelca for the treatment of adult patients with metastatic small cell lung cancer. The company also offers Xywav, an oxybate product candidate, to treat EDS and cataplexy with narcolepsy and idiopathic hypersomnia; JZP-324, a low sodium oxybate formulation with the potential to provide a clinically meaningful option for narcolepsy patients; JZP385, a T-type calcium channel modulator, for the treatment of essential tremor; JZP458, a recombinant Erwinia asparaginase, for use as a component of a multi-agent chemotherapeutic regimen in the treatment of pediatric and adult patients; and JZP150 for treatment of post-traumatic stress disorder. The company has licensing and collaboration agreements with ImmunoGen, Inc.; Codiak BioSciences, Inc.; Pfenex, Inc.; XL-protein GmbH; and Redx Pharma plc. Jazz Pharmaceuticals plc was incorporated in 2003 and is headquartered in Dublin, Ireland.
Full company profile →Short Interest
11.6%
5.5 days to cover
Frequently Asked Questions
Does Rock Springs Capital own JAZZ?
Yes. As of Q4 2025, Rock Springs Capital holds 1,750 shares of Jazz Pharmaceuticals plc (JAZZ) valued at $298K. This data comes from their SEC 13F filing.
How many hedge funds own JAZZ?
7 specialist biotech hedge funds currently hold JAZZ, including EcoR1 Capital, Deep Track Capital, Redmile Group and 3 more. When 3 or more specialist funds hold the same stock, BiotechEdge flags it as a convergence signal.
When did Rock Springs Capital first buy JAZZ?
Rock Springs Capital's position in JAZZ was first reported in Q4 2025. 13F filings are reported with a 45-day delay, so the actual purchase may have occurred earlier in the quarter.
Is Rock Springs Capital's JAZZ position increasing or decreasing?
Rock Springs Capital initiated a new position in JAZZ in the most recent quarter. This is their first reported holding.
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