Following are some of the companies that are working on pre-clinical studies in phage therapy R&D.
AmpliPhi Biosciences (US 
Enbiotix (US
Fixed Phage (UK
InnoPhage? (PT
Intralytix (US
Pherecydes Pharma (FR
Sarum Biosciences (UK
Synthetic Genomics? (US
Technophage (PT)
PHAGElogist 