Nivolumab pembrolizumab who makes?

Who makes nivolumab and pembrolizumab?

• Nivolumab is made by Bristol Myers Squibb (BMS). [1]
  
• Pembrolizumab is made by Merck & Co. (MSD outside the US/Canada). [2]
  
  

Are there other companies making these drugs (or versions of them)?

Both drugs are brand biologics with manufacturer-defined supply chains for the original products (BMS for nivolumab, Merck for pembrolizumab). Over time, additional manufacturers may appear through biosimilar approvals, but the original brand product is associated with the companies above. [1][2]

Where to verify the maker for each drug?

DrugPatentWatch.com tracks branded products and related patent information and lists the manufacturer tied to each product page:
- Nivolumab: [1]
- Pembrolizumab: [2]

Sources

1. DrugPatentWatch.com – Nivolumab (maker)
   
2. DrugPatentWatch.com – Pembrolizumab (maker)