Amgen has acquired Ireland-based biotechnology company Horizon Therapeutics in a $27.8bn (£22.76bn) deal following US Federal Trade Commission (FTC) approval.

The latest acquisition will bolster the inflammation portfolio of Amgen by adding Horizon’s medicines for treating rare inflammatory ailments. 

Discover B2B Marketing That Performs

Combine business intelligence and editorial excellence to reach engaged professionals across 36 leading media platforms.

Find out more

These medicines include Tepezza (teprotumumab-trbw), Krystexxa (pegloticase) and Uplizna (inebilizumab-cdon).

In December 2022, Amgen entered an agreement to acquire the complete ordinary share capital of Horizon.

In May 2023, the FTC sued Amgen, blocking the Horizon takeover and claiming that the deal would “entrench monopoly drugs” intended for treating serious ailments.

In September 2023, Amgen and Horizon entered a consent order agreement with the FTC to resolve the lawsuit.

GlobalData Strategic Intelligence

US Tariffs are shifting - will you react or anticipate?

Don’t let policy changes catch you off guard. Stay proactive with real-time data and expert analysis.

By GlobalData

Amgen is barred from bundling its product with either Tepezza or Krystexxa.

Tepezza treats thyroid eye disease and Krystexxa is a chronic refractory gout treatment. 

Amgen chairman and CEO Robert Bradway stated: “Today marks an exciting milestone as we welcome Horizon employees to Amgen and begin working together to serve even more patients around the world suffering from serious illnesses. 

“We have strong momentum in our core business and the addition of Horizon will further position Amgen as a leader across a broader range of diseases.”

Pharmaceutical Technology Excellence Awards - Nominations Closed

Nominations are now closed for the Pharmaceutical Technology Excellence Awards. A big thanks to all the organisations that entered – your response has been outstanding, showcasing exceptional innovation, leadership, and impact.

Excellence in Action
NorthWest EHealth has won three 2025 Pharmaceutical Technology Excellence Awards for Innovation, Safety and Diversity. Explore how its ConneXon platform is transforming SAE reporting and real-time safety oversight, while FARSITE delivers socio-economically inclusive recruitment to boost trial efficiency, data integrity and regulatory-grade representativeness.

Discover the Impact