BMS and Ono sue Amgen to block proposed Opdivo biosimilar

17 September 2026

Bristol Myers Squibb (NYSE: BMY) and Ono Pharmaceutical (TYO: 4528), the US and Japanese pharma majors that co-developed Opdivo (nivolumab), have sued Amgen (Nasdaq: AMGN) in the US District Court for the District of Delaware, seeking to block Amgen's proposed US biosimilar of the cancer immunotherapy.

The complaint, filed under seal on September 8 and unsealed the following week, alleges that Amgen's candidate, ABP 206, would infringe seven US patents covering Opdivo, and asks the court to bar sales of the biosimilar while those patents remain in force. 

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