Which drug company owns nivolumab?

Who owns nivolumab (Opdivo) and which company makes it?

Nivolumab is marketed under the brand name Opdivo. The drug is owned/developed by Bristol Myers Squibb (BMS) through its commercialization of Opdivo.

Does any other company “own” nivolumab too?

No other company is the primary owner of nivolumab’s Opdivo brand and product rights. Other firms may market versions in specific regions, collaborate in development, or compete with similar checkpoint inhibitors, but Opdivo/nivolumab is tied to Bristol Myers Squibb as the originating company.

Where can I verify the owner/company for nivolumab rights and patents?

DrugPatentWatch.com tracks drug patents and related filings, which can help confirm the company tied to nivolumab/IP. See: DrugPatentWatch.com – nivolumab [1]

Sources:
[1] https://www.drugpatentwatch.com/?s=nivolumab