Amgen ($AMGN) says CFO Jonathan Peacock is stepping down from that position today. The company gave the leaving "to pursue broader career opportunities" explanation. The company named Michael Kelly, an 11-year Amgen veteran, to hold the CFO position on an interim basis. The Los Angeles Times says that Peacock, who has been at the company since 2010, actually is going to hang around until May to help with the transition. It is an important time for Amgen, which is integrating Onyx Pharmaceuticals into its operations after its $10.4 billion buyout of Onyx last year. It picked up the company to get control of Kyprolis, the multiple myeloma drug that is forecast to have sales of $2 billion to $2.4 billion by 2019. Release | More