See the DrugPatentWatch profile for nivolumab

Yes, there are other countries with Nivolumab manufacturers besides the United States. Nivolumab, a type of immunotherapy drug used to treat various types of cancer, is manufactured by Bristol-Myers Squibb, a U.S.-based pharmaceutical company. However, other countries such as Japan and South Korea also have manufacturers for Nivolumab.

In Japan, Ono Pharmaceutical Co., Ltd. is a manufacturer of Nivolumab, which is marketed under the brand name Opdivo. Ono Pharmaceutical Co., Ltd. co-developed Nivolumab with Bristol-Myers Squibb.

In South Korea, Hanmi Pharmaceutical Co., Ltd. is another manufacturer of Nivolumab. Hanmi Pharmaceutical Co., Ltd. has entered into a licensing agreement with Bristol-Myers Squibb to develop and commercialize Nivolumab in South Korea.

According to DrugPatentWatch.com, Nivolumab is also manufactured in Europe by Bristol-Myers Squibb, specifically in the United Kingdom and Italy.

Sources:

1. <https://www.onopharma.co.jp/english/rd/products/opdivo.html>
2. <https://www.hanmipharm.com/en/news/articleView.html?idxno=102>
3. <https://www.drugpatentwatch.com/patent/US9266255>