In the unaudited accounts, BI Worldwide also reported a 37% increase in turnover, from £23.5m to £32.2m, for the year ending 30 June 2014.
The Milton Keynes-based agency has also increased staff numbers from 140 to 170 in the past 12 months, which is almost double the number it employed pre-recession.
Managing director Mike Davies said: "To grow our business at this rate is a credit to the incredible team of people here at BI Worldwide. It is especially pleasing given that we grew by 20% last year and have now almost doubled in size since 2011. Our original goal back then was to achieve this milestone by 2017."
In the next year, the agency plans to recruit a further 20 staff, following a successful start to the new financial year. Davies added: "The strategies we originally set out in 2011 have worked well and continue to produce outstanding results. We are very confident that the next 12 months will see continued growth."