REUTERS/Frederick Murphy/CDC/Handout
ZMapp was developed by Mapp Biopharmaceutical, a privately held company.
It's not to be confused with MAP Pharmceuticals, which was acquired by Allergan in 2013.
Tekmira Pharmaceuticals, which also has an experimental ebola drug in the works, is up by around 5% in pre-market trading. It's unclear why.
Here's the after-hours and pre-market moves in Tekmira according to MarketWatch.