Are Gilead or Roche Interested in Buying Tesaro? Company Rumored to be on the Market

Tesaro, located in Waltham, Mass., is rumored to be up for sale. The rumors caused shares to rocket as much as 39 percent on Friday, but it’s not the first time rumors have floated that the company might be on the auction block. There were reports in June and July that Roche might consider buying the oncology company.