Horizon Therapeutics USA Inc filed a WARN notice in 2026 with the state of Maryland on March 9, 2026, laying off 22 employees effective May 8, 2026. This filing relates to Horizon Therapeutics USA Inc’s Maryland operations and is sourced directly from official state WARN records.
Biotechnology Research
In October 2023, Amgen completed its $27.8 billion acquisition of Horizon Therapeutics. After the acquisition closed, Amgen began migrating Horizon’s web presence to Amgen’s main domain. As part of that transition, horizontherapeutics.com now automatically redirects to amgen.com. Amgen discovers, develops, manufactures and delivers innovative medicines to fight some of the world’s toughest diseases. Harnessing the best of biology and technology, Amgen reaches millions of patients with its medicines, helping make people’s lives easier, fuller and longer.
Website
www.horizontherapeutics.com
Headquarters
Suite 325 Rockville, Maryland
22
Affected Employees
May 8, 2026
Layoff Date
March 9, 2026
Notice Date
