SDI Productions/E+ via Getty Images Amgen Inc. (NASDAQ:AMGN) is one of the largest biopharmaceutical companies in the world, and it has been rapidly increasing its share of the global oncology medications market in recent years. Investment thesis The day after the company released its first-quarter 2024 financial results in early May, its share price rose more than 15%. In my opinion, the growth of Amgen's investment attractiveness in recent weeks is directly related to the successful integration of Horizon ...