Horizon Therapeutics to Be Acquired by Amgen for Approximately $28 Billion

San Diego – December 12, 2022 – A Cooley team advised Horizon Therapeutics, a specialty biopharmaceutical company, on its agreement to be acquired by Amgen. The approximately $28 billion merger would represent the third-largest all-cash transaction in the pharmaceutical sector in history and the biggest healthcare deal of 2022.

M&A partners Barbara Borden, Rama Padmanabhan and Rowook Park and corporate partner Kay Chandler, as well as associates Lindsey O’Crump, Edmond Lay, Vivian Tsai and Melissa Meza, led the team advising Horizon.

Partners Ross Eberly (labor), Todd Gluth (tax), Jacqueline Grise (antitrust), Alexander Israel (antitrust), Rishab Kumar (M&A), Chadwick Mills (public companies), Phil Mitchell (regulatory), Alessandra Murata (compensation & benefits), John Paul Oleksiuk (trademark), Michael Tollini (debt finance), Charity Williams (life sciences) and Elizabeth Anne Wright (regulatory) provided valuable advice. Special counsel David Burns, Stella Sarma and Matt Silverman, and associates Ajay Athavale, Justin Kisner, Joe Mandry and Addison Pierce, also played key roles in the transaction.

Cooley has worked with Horizon since 2008 on all aspects of its business, from corporate matters, securities transactions, debt transactions and business development transactions – including M&A and strategic partnering – to antitrust and regulatory counseling, compensation and benefits, employment, patent, tax, and litigation on securities, commercial and IP matters.

Cooley has represented Horizon in all its significant matters, including taking the company public in 2011 and multiple acquisitions that built its product portfolio. A Cooley team advised Horizon in an Irish tax inversion transaction with Vidara in 2014 and acquisition of its flagship product, TEPEZZA, from River Vision in 2017. Headquartered in Dublin, Ireland, Horizon focuses on improving patients’ lives by identifying, developing, acquiring and commercializing differentiated products that address unmet medical needs.

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Related Contacts
Barbara Borden  Partner San Diego
Kay Chandler  Partner San Diego
Rama Padmanabhan  Partner San Diego
Rowook Park  Partner San Diego
Jacqueline Grise  Partner Washington, DC
Alessandra Murata  Partner Palo Alto
Michael Tollini  Partner Washington, DC, New York
Todd Gluth  Partner San Diego
Lindsey O'Crump  Associate Washington, DC
Edmond Lay  Associate San Diego
Vivian Tsai  Associate Los Angeles – Santa Monica, Los Angeles – Downtown
Melissa Meza  Associate San Diego
Peter Adams  Partner San Diego
Fraser Brown  Partner Washington, DC
Ross Eberly  Partner Los Angeles – Santa Monica, Los Angeles – Downtown
Patrick Van Eecke  Partner Brussels
David Fletcher  Partner Washington, DC
Caroline Hobson  Partner London
Alexander Israel  Partner Brussels, London
Christopher Kimball  Partner Washington, DC
Chadwick Mills  Partner San Francisco
Phil Mitchell  Partner New York
John Paul Oleksiuk  Partner New York, Los Angeles – Santa Monica
Lei Shen  Partner Chicago
Charity Williams  Partner San Diego
Elizabeth Wright  Special Counsel Boston
David Burns  Special Counsel Washington, DC
Sharon Connaughton  Special Counsel Washington, DC
David Crawford  Special Counsel San Diego
Christine Graham  Special Counsel London, Brussels
Natasha Leskovsek  Of Counsel Washington, DC
Rebecca Ross  Special Counsel Washington, DC
Stella Sarma  Special Counsel Brussels, London
Matthew D. Silverman  Special Counsel Los Angeles – Santa Monica
Karen Tsai  Special Counsel Washington, DC
Karun Ahuja  Associate Chicago
Wade Andrews  Associate San Diego
Ajay Athavale  Associate San Francisco
Anna Caro  Associate London
Umer Chaudhry  Associate Washington, DC
Megan Drill  Associate San Diego
Michael Fernando  Associate London
Daniel Gillon  Associate San Diego
Zack Gong  Associate Shanghai
Ellie Guadiana  Partner Los Angeles – Santa Monica, Los Angeles – Downtown
Justin Kisner  Special Counsel Palo Alto
Jessica Koffel  Associate Brussels
Allison Kutner  Associate New York
Daniel Lac  Associate San Diego
Jan Lang  Associate Brussels
Katie MacDowell  Associate Reston
Joe Mandry  Associate San Diego
Hajra Nashin  Associate San Diego
Dani Nazemian  Special Counsel San Diego
Linh Nguyen  Associate San Diego
Alexandra Paterson  Associate London
Addison Pierce  Associate Chicago
Bartholomäus Regenhardt  Associate Brussels
Arman Sagart  Associate San Diego
Grant Schweikert  Special Counsel Washington, DC
Michael Tiab  Associate San Diego
Michael Weinstein  Associate San Diego
Alexander Wenzel  Associate Brussels