Shares in Porta Communications rose after as it told the market earnings after all costs would be "significantly higher" than the past year. Porta shares were up 2.6% to 9.88p at 11:52 on Thursday after the company said its first half results would be higher than last year's.In a statement the firm said the strong trading pattern highlighted at the time of its preliminary results has continued through the first half of 2015."Also, as previously indicated, there will be a big reduction in exceptional costs, reflecting the growing maturity of all our start-ups."Porta said recent acquisitions Redleaf, Publicasity and PPS performed well, while its international start-ups in the Asia-Pacific region traded at record levels.