Three-time Tour de France champion Chris Froome and five-time Olympic gold medallist Sir Bradley Wiggins were among those whose stolen files werepublished by Fancy Bears.
Ukad chief executive Nicole Sapstead said it is trying to contact athletes.
The files were stolen from the World Anti-Doping Agency (Wada).
They relate to therapeutic use exemptions (TUEs), which allow banned substances to be used for medical reasons.
