The company won the best digital publisher business prize at the Association of Online Publishing Awards ahead of competition from Incisive Media, Thomson Reuters and IDG.
The judging panel said HBM was "doing great things with an effective, long-term engagement strategy".
Kevin Costello, chief executive of Haymarket Media Group, said: "I’m thrilled that the effort, energy and commitment of all our Business Media digital teams has been recognised by the AOP.
"We have invested significantly in the development of our digital platforms and are now enjoying returns and growth."
HBM also publishes sites such as Brand Republic, Campaign, Horticultural Week and Third Sector.