It predicted that underlying earnings (EBITDA) will be "significantly higher than that achieved in the whole of 2014", in an AGM statement issued today.
AIM-listed Porta said there would also be a "big reduction in exceptional costs" because of the "growing maturity" of its start-up companies.
The company reported that its three main acquisitions in 2014 - Publicasity and PPS – were "performing well".
Its international start-ups, operating under the Newgate brand in Australia, Hong Kong and Singapore, were trading at "record levels", the company announced, adding that the board was confident about the outcome of 2015.
Porta reported positive underlying earnings for the first time in 2014 with its PR business performing particularly strongly as fee income rose 135 per cent to £19.4m.