Trinity Mirror purchased the regional titles from the Guardian Media Group (GMG) in March and they have to date contributed revenues of £18.2m and an operating profit of £2.7m to the group.
Overall, the group, headed by chief executive Sly Bailey, disclosed that the company was still dealing with a "fragile economy" and "volatile trading conditions", which impacted on its advertising revenue.
Bailey said she remained "cautious", but "confident of delivering a robust performance for the full year, driven by stabilising revenues and continued cost efficiencies."
Pre-tax profits were up from £31.3m to £50.4m year on year in the 26 weeks to 4 July. Revenues across the group were slightly down, from £383m to £382.2m in the period.
Advertising revenues at Trinity's Mirror's national division, which houses the Daily Mirror and The People, increased 2.2%, from £64.4m to £65.8m. Revenue at the division was down from £227.6m to £219.8m.
Across its regionial division, excluding GMG regional media, revenues fell from £139.2m to £129m. Digital revenues at the unit fell from £16.2m to £15.2m.
Commenting on the acquisition of GMG Regional Media by Trinity Mirror for £44.8m in February, Bailey said: "The acquisition of GMG Regional Media was a clear demonstration of our ability to lead consolidation in regional media in a way that adds substantial value for shareholders."
The deal included a £7.4m cash sum and the cancellation of a £37.4m printing contract.
Total costs at Trinity Mirror, excluding the GMG titles, were reduced by £29m.
Bailey said: "We have continued to invest in the business through the downturn, in strengthening the portfolio and delivering IT led efficiencies, in addition to maintaining a keen focus on costs. We are now reaping the benefits of these actions, with profits increasing and slowing rates of decline in underlying revenues."