The other agencies in the top four remained unchanged despite third place Carat dropping by 15.7%. MEC, which this year merged with ninth placed Maxus to create Wavemaker, was at the number 4 spot.
Of all the agencies in the top 10, PHD enjoyed the biggest proportionate growth – its billings increased by 52.6% to £524.4m and it rose four places up the table from number 10 to number 6.
Zenith experienced the biggest drop of the top 10 agencies – its billings fell 24% to £453.23m.
Elsewhere in the top 20, The7stars consolidated its position as the largest independent with growth of 15.2% but remained at number 12. Goodstuff Communications grew 25.3% year on year to take it over the £100m mark for the first time. There were also significant increases for Starcom, Blue 449, Initiative and M/six.