GSK TO ACQUIRE HUMAN GENOME SCIENCES FOR US$14.25 PER SHARE IN CASH

GSK TO ACQUIRE HUMAN GENOME SCIENCES FOR US$14.25 PER SHARE IN CASH

    GSK to acquire full ownership of BENLYSTA®, albiglutide and darapladib
    Acquisition will be accretive to GSK core earnings in 2013
    Tender offer amended to US$14.25 per share and extended until 27 July 2012

GlaxoSmithKline plc (LSE: GSK) and Human Genome Sciences (NASDAQ: HGSI) today announced that the companies have entered into a definitive agreement under which GSK will acquire HGS for US$14.25 per share in cash. The transaction values HGS at approximately US$3.6 billion on an equity basis, or approximately US$3 billion net of cash and debt, and represents a premium of 99% to the HGS closing price of US$7.17 per share on 18 April 2012, the last day of trading before HGS publicly disclosed GSK's initial private offer. The Boards of Directors of both companies have approved the transaction.

The transaction is well aligned with GSK's long-term strategy of delivering sustainable growth, simplifying GSK's business model, enhancing R&D returns and deploying capital with discipline. Through complete ownership of BENLYSTA, albiglutide and darapladib, GSK can simplify and optimize R&D, commercial and manufacturing operations to advance these products most effectively and efficiently while securing the full potential long-term value of the assets. GSK expects to achieve at least US$200 million in cost synergies to be fully realized by 2015, subject to appropriate consultation, and expects the transaction to be accretive to core earnings beginning in 2013. GSK also assessed the potential returns of this acquisition relative to its long-term share buyback program. As part of this ongoing program, GSK continues to expect to repurchase £2-2.5 billion in shares in 2012.

Sir Andrew Witty, Chief Executive Officer of GSK, said: "We are pleased to have reached a mutually beneficial agreement with HGS on friendly terms and believe the combination of GSK and HGS represents clear financial and strategic logic for both companies and our respective shareholders. The transaction meets GSK's strict financial criteria for acquisitions, and we expect will deliver significant returns over the long-term. This is a natural next step in our nearly 20-year relationship with HGS, and we look forward to working with HGS to integrate our businesses and to realizing the full value of BENLYSTA, albiglutide, and darapladib for the benefit of patients and our shareholders."

H. Thomas Watkins, President and Chief Executive Officer, HGS, said: "After a thorough analysis of strategic alternatives, HGS has determined that a combination with GSK is the best course of action for our company and the best way to maximize value for our stockholders. HGS has had a long and productive working relationship with GSK, and together we will be uniquely positioned to achieve the full potential of BENLYSTA and other products in our pipeline for the benefit of those battling serious disease around the world. I would like to thank the dedicated employees of HGS, who have worked tirelessly to achieve breakthrough results and are the foundation of our success. We look forward to working with GSK to ensure a seamless transition for all of our stakeholders."  

GSK has amended its pending tender offer to increase the price to US$14.25 per share and to extend the expiration of the offer to 12:00 midnight, New York City time, on 27 July 2012. As of the close of business on 13 July, approximately 427,042 shares had been tendered and not withdrawn, pursuant to the offer. The offer is subject to customary conditions as set forth in the Merger Agreement being filed today by the parties with the SEC.

Lazard and Morgan Stanley are acting as financial advisors to GSK, and Cleary Gottlieb Steen & Hamilton and Wachtell, Lipton, Rosen & Katz are providing legal advice to the company. Goldman, Sachs & Co. and Credit Suisse Securities (USA) LLC are serving as financial advisors to HGS, and Skadden, Arps, Slate, Meagher & Flom LLP and DLA Piper LLP (US) are serving as legal counsel.

GlaxoSmithKline – one of the world's leading research-based pharmaceutical and healthcare companies – is committed to improving the quality of human life by enabling people to do more, feel better and live longer. For further information please visit www.gsk.com.

Human Genome Sciences -- exists to place new therapies into the hands of those battling serious disease. For more information about HGS, please visit the Company's web site at www.hgsi.com. HGS, Human Genome Sciences and BENLYSTA® are trademarks of Human Genome Sciences, Inc. Other trademarks referenced are the property of their respective owners.

GlaxoSmithKline Enquiries:
UK Media enquiries:
David Mawdsley +44 (0) 20 8047 5502 (London)
Sarah Spencer +44 (0) 20 8047 5502 (London)

Analyst/Investor enquiries:
Sally Ferguson +44 (0) 20 8047 5543 (London)
Tom Curry + 1 215 751 5419 (Philadelphia)
Gary Davies + 44 (0) 20 8047 5503 (London)
Jeff McLaughlin + 1 215 751 7002 (Philadelphia)
Ziba Shamsi + 44 (0) 20 8047 3289 (London)
James Dodwell + 44 (0) 20 8047 2406 (London)

Sard Verbinnen & Co:
US Media enquiries
George Sard +1 212 687 8080 (New York)
Andrew Cole +1 212 687 8080 (New York)
Michael Henson +1 212 687 8080 (New York)

Human Genome Sciences Enquiries:
Media:
Susannah Budington
Director, Corporate Public Relations
301-545-1062

Jerry Parrott
Vice President, Corporate Communications
301-315-2777

Investor Contact:
Claudine Prowse, Ph.D.
Vice President, Investor Relations
301-610-5800

Additional Contacts:
Joele Frank / Dan Katcher / Jamie Moser
Joele Frank, Wilkinson Brimmer Katcher
(212) 355-4449

Arthur Crozier / Jennifer Shotwell / Larry Miller
Innisfree M&A Incorporated
(212) 750-5833

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