Mainfreight reported a net profit after tax and before abnormals of $8.22 million in the three months to June 30, up 40.7 percent from the same period last year.
Earnings before interest tax, depreciation and amortisation (Ebitda) rose 39.2 percent to $16.56 million.
"This improved performance came from our operations in New Zealand and the United States of America," the company said.
But profits were down in Australia as costs were incurred to put a growth strategy in place.
The company's New Zealand domestic division notched up a 17.9 percent increase in revenue in the quarter from a year ago and the company said it increased market share.
Of the $11.5m in increased revenue, $5.81m was from new customers.
"While established customer tonnage trades at similar levels to the prior period, this increased market share has provided good growth during challenging economic conditions," the company said.
Margins were in line with last year.
The statement came after thousands of truck operators stopped traffic in cities and towns around the country in July to protest against rising costs and poor notification of an increase in road user charges.
Mainfreight has been expanding strongly into the United States and Asia.
Mainfreight USA and CaroTrans reported revenues for the period of $US79.66m ($NZ113m), and a combined Ebitda of $US3.63m.
Revenues in Asia improved 33.4 percent to $US3.84m and Ebitda was in line with the previous period at $US0.45m.
The company said trading in July and August has been in line with last year.
"We remain cautiously optimistic about our performance for the remainder of the year," Mainfreight said.
