DUBLIN - Jazz Pharmaceuticals plc (Nasdaq: JAZZ) and GW Pharmaceuticals plc (Nasdaq: GWPH) today announced the companies have entered into a definitive agreement for Jazz to acquire GW for $220.00 per American Depositary Share (ADS), in the form of $200.00 in cash and $20.00 in Jazz ordinary shares, for a total consideration of $7.2 billion, or $6.7 billion net of GW cash.

The transaction, which has been unanimously approved by the Boards of Directors of both companies, is expected to close in the second quarter of 2021.

Upon close of the transaction, the combined company will be a leader in neuroscience with a global commercial and operational footprint well positioned to maximize the value of its diversified portfolio.

GW is a global leader in discovering, developing, manufacturing and commercializing novel, regulatory approved therapeutics from its proprietary cannabinoid product platform to address a broad range of diseases. The company's lead product, Epidiolex (cannabidiol) oral solution, is approved in patients one-year and older for the treatment of seizures associated with Lennox-Gastaut Syndrome (LGS), Dravet Syndrome and Tuberous Sclerosis Complex (TSC), all of which are rare diseases characterized by severe early-onset epilepsy. Epidiolex was the first plant-derived cannabinoid medicine ever approved by the U.S. Food and Drug Administration (FDA). This product has also been approved, under the tradename Epidyolex, by the European Medicines Agency (EMA) in patients two years of age and older for the adjunctive treatment of seizures associated with LGS and Dravet syndrome in conjunction with clobazam and is under EMA review for the treatment of seizures associated with TSC. In addition to the approved indications for Epidiolex, there are considerable opportunities to pursue other indications within the epilepsy field, including other treatment-resistant epilepsies where significant unmet needs of patients exist.

Beyond Epidiolex, GW has a scientific platform and deep innovative pipeline of cannabinoid product candidates, as well as highly specialized manufacturing expertise, developed over two decades of pioneering and building leadership in cannabinoid science. This pipeline includes nabiximols, for which the company is in Phase 3 trials to seek FDA approval for treatment of spasticity associated with multiple sclerosis and spinal cord injury, as well as earlier-stage cannabinoid product candidates for autism and schizophrenia.

'Jazz is proud of our leadership position in sleep medicines and rapidly growing oncology business. We are excited to add GW's industry-leading cannabinoid platform, innovative pipeline and products, which will strengthen and broaden our neuroscience portfolio, further diversify our revenue and drive sustainable, long-term value creation opportunities,' said Bruce Cozadd, chairman and CEO of Jazz Pharmaceuticals. 'We are joining two teams that share a passion for, and track record of, developing differentiated therapies that advance science and transform the lives of patients. This will help facilitate a successful integration and bring added capabilities to Jazz. Given the strength of our balance sheet and the meaningful financial drivers of the transaction, we are confident in the value we can deliver to both companies' shareholders and patients. We look forward to welcoming the GW team to Jazz to build an even stronger company.'

'Over the last two decades, GW has built an unparalleled global leadership position in cannabinoid science, including the successful launch of Epidiolex, a breakthrough product within the field of epilepsy, and a diverse and robust neuroscience pipeline. We believe that Jazz is an ideal growth partner that is committed to supporting our commercial efforts, as well as ongoing clinical and research programs,' said Justin Gover, CEO of GW Pharmaceuticals. 'We have a shared vision of developing and commercializing innovative medicines that address significant unmet needs in neuroscience and an approach of putting patients first. Together, we will have an opportunity to reach and impact more patients through a broader portfolio of neuroscience-focused therapies than ever before.'

Creates an Innovative, High-Growth, Global Biopharma Leader with Financial Strength

Adding a Third High-Growth Commercial Franchise: The transaction enhances product diversification through the addition of a third high-growth commercial franchise for critical unmet patient needs within: 1) sleep disorders, 2) oncology, and 3) epilepsies. Specifically, the acquisition will expand Jazz's growing neuroscience business by adding Epidiolex, a global, high-growth childhood-onset epilepsy franchise with near-term blockbuster potential.

GW has rapidly scaled Epidiolex, achieving approximately $510 million in annual sales within two years of launch and broad access to date, with more than 97% of U.S. lives covered1. Epidiolex addresses significant unmet needs in the field of epilepsy and offers the potential for a substantial improvement in outcomes for patients who were previously drug resistant. The combined company will create a neuroscience leader with a global franchise and complementary therapeutic expertise, to maximize the value of XywavTM (calcium, magnesium, potassium, and sodium oxybates) oral solution, Epidiolex, and other neuroscience products.

Robust Combined Pipeline in Neuroscience and Oncology to Drive Sustainable Growth: GW's novel cannabinoid platform will expand and diversify Jazz's growing neuroscience pipeline. The collective Jazz and GW teams will bring highly complementary expertise to a pro-forma pipeline of 19 clinical development programs across neuroscience and oncology, including in sleep, epilepsy, movement disorders, psychiatry, hematology and solid tumors. Following the close of the transaction, the combined portfolio will include highly differentiated assets addressing significant unmet patient needs, which, when combined with complementary commercial models, accelerates Jazz's growth strategy.

Shared Culture and Exceptional Talent Will Advance Mission to Transform the Lives of Patients: Jazz and GW are focused on developing life-changing medicines for people with serious diseases, often with limited or no treatment options. Jazz's and GW's global teams possess unique talents and expertise and have proven capability to develop and launch differentiated therapies to support often-overlooked patient populations. Both companies are guided by shared values that include integrity, collaboration, passion, innovation and pursuit of excellence, and have cultures where diversity, equity and inclusion are a priority. The transaction brings together two companies with a significant presence in the United Kingdom, which is expected to remain an important part of the combined enterprise.

About Jazz Pharmaceuticals plc

Jazz Pharmaceuticals plc (Nasdaq: JAZZ) is a global biopharmaceutical company dedicated to developing and commercializing life-changing medicines that transform the lives of patients with serious diseases - often with limited or no options. We have a diverse portfolio of marketed medicines and novel product candidates, from early- to late-stage development, in key therapeutic areas. Our focus is in neuroscience, including sleep and movement disorders, and in oncology, including hematologic malignancies and solid tumors. We actively explore new options for patients including novel compounds, small molecule advancements, biologics and innovative delivery technologies. Jazz is headquartered in Dublin, Ireland and has employees around the globe, serving patients in more than 90 countries.

About GW Pharmaceuticals plc

Founded in 1998, GW is a biopharmaceutical company focused on discovering, developing and commercializing novel therapeutics from its proprietary cannabinoid product platform in a broad range of disease areas. The Company's lead product, EPIDIOLEX (cannabidiol) oral solution, is commercialized in the U.S. by its U.S. subsidiary Greenwich Biosciences for the treatment of seizures associated with Lennox-Gastaut syndrome (LGS), Dravet syndrome, or tuberous sclerosis complex (TSC) in patients one year of age and older. This product has received approval in the European Union under the tradename EPIDYOLEX for the adjunctive treatment of seizures associated with LGS or Dravet syndrome in conjunction with clobazam in patients two years and older and is under EMA review for the treatment of TSC. The Company has a deep pipeline of additional cannabinoid product candidates, in particular nabiximols, for which the Company is advancing multiple late-stage clinical programs in order to seek FDA approval in the treatment of spasticity associated with multiple sclerosis and spinal cord injury. The Company has additional cannabinoid product candidates in clinical trials for autism and schizophrenia.

Contact:

Jacqueline Kirby

Tel: +353 1 697 2141

Forward Looking Statements

This communication contains forward-looking statements regarding Jazz Pharmaceuticals and GW Pharmaceuticals, including, but not limited to, statements related to the proposed acquisition of GW Pharmaceuticals and the anticipated timing, results and benefits thereof, including the potential for Jazz Pharmaceuticals to accelerate its growth and neuroscience leadership, and for the acquisition to provide long-term growth opportunities to create shareholder value; Jazz Pharmaceuticals' expected financing for the transaction and other statements that are not historical facts. You can generally identify forward-looking statements by the use of forward-looking terminology such as 'anticipate,' 'believe,' 'continue,' 'could,' 'estimate,' 'expect,' 'explore,' 'evaluate,' 'intend,' 'may,' 'might,' 'plan,' 'potential,' 'predict,' 'project,' 'seek,' 'should,' or 'will,' or the negative thereof or other variations thereon or comparable terminology. These forward-looking statements are based on each of the companies' current plans, objectives, estimates, expectations and intentions and inherently involve significant risks and uncertainties, many of which are beyond Jazz Pharmaceuticals' or GW Pharmaceuticals' control. Actual results and the timing of events could differ materially from those anticipated in such forward-looking statements as a result of these risks and uncertainties, which include, without limitation, risks and uncertainties associated with: Jazz Pharmaceuticals' and GW Pharmaceuticals' ability to complete the acquisition on the proposed terms or on the anticipated timeline, or at all, including risks and uncertainties related to securing the necessary regulatory and shareholder approvals, the sanction of the High Court of Justice of England and Wales and satisfaction of other closing conditions to consummate the acquisition; the occurrence of any event, change or other circumstance that could give rise to the termination of the definitive transaction agreement relating to the proposed transaction; risks related to diverting the attention of GW Pharmaceuticals' and Jazz Pharmaceuticals' management from ongoing business operations; failure to realize the expected benefits of the acquisition; significant transaction costs and/or unknown or inestimable liabilities; the risk of shareholder litigation in connection with the proposed transaction, including resulting expense or delay; the risk that GW Pharmaceuticals' business will not be integrated successfully or that such integration may be more difficult, time-consuming or costly than expected; Jazz Pharmaceuticals' ability to obtain the expected financing to consummate the acquisition; risks related to future opportunities and plans for the combined company, including the uncertainty of expected future regulatory filings, financial performance and results of the combined company following completion of the acquisition; GW Pharmaceuticals' dependence on the successful commercialization of Epidiolex/Epidyolex and the uncertain market potential of Epidiolex; pharmaceutical product development and the uncertainty of clinical success; the regulatory approval process, including the risks that GW Pharmaceuticals may be unable to submit anticipated regulatory filings on the timeframe anticipated, or at all, or that GW Pharmaceuticals may be unable to obtain regulatory approvals of any of its product candidates, including nabiximols and Epidiolex for additional indications, in a timely manner or at all; disruption from the proposed acquisition, making it more difficult to conduct business as usual or maintain relationships with customers, employees or suppliers; effects relating to the announcement of the acquisition or any further announcements or the consummation of the acquisition on the market price of Jazz Pharmaceuticals' ordinary shares or GW Pharmaceuticals' American depositary shares or ordinary shares; the possibility that, if Jazz Pharmaceuticals does not achieve the perceived benefits of the acquisition as rapidly or to the extent anticipated by financial analysts or investors, the market price of Jazz Pharmaceuticals' ordinary shares could decline; potential litigation associated with the possible acquisition; regulatory initiatives and changes in tax laws; market volatility and other risks and uncertainties affecting Jazz Pharmaceuticals and GW Pharmaceuticals, including those described from time to time under the caption 'Risk Factors' and elsewhere in Jazz Pharmaceuticals' and GW Pharmaceuticals' Securities and Exchange Commission (SEC) filings and reports, including Jazz Pharmaceuticals' Annual Report on Form 10-K for the year ended December 31, 2019 and Quarterly Report on Form 10-Q for the quarter ended September 30, 2020, GW Pharmaceuticals' Annual Report on Form 10-K for the year ended December 31, 2019 and Quarterly Report on Form 10-Q for the quarter ended September 30, 2020, and future filings and reports by either company. In addition, while Jazz Pharmaceuticals and GW Pharmaceuticals expect the COVID-19 pandemic to continue to adversely affect their respective business operations and financial results, the extent of the impact on the combined company's ability to generate sales of and revenues from its approved products, execute on new product launches, its clinical development and regulatory efforts, its corporate development objectives and the value of and market for its ordinary shares, will depend on future developments that are highly uncertain and cannot be predicted with confidence at this time. Moreover, other risks and uncertainties of which Jazz Pharmaceuticals or GW Pharmaceuticals are not currently aware may also affect each of the companies' forward-looking statements and may cause actual results and the timing of events to differ materially from those anticipated. Investors are cautioned that forward-looking statements are not guarantees of future performance. The forward-looking statements made in this communication are made only as of the date hereof or as of the dates indicated in the forward-looking statements and reflect the views stated therein with respect to future events as at such dates, even if they are subsequently made available by Jazz Pharmaceuticals or GW Pharmaceuticals on their respective websites or otherwise.

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