Don Braid: Mainfreight General Manager on the company's full year net profit going up a third on the previous year - Heather du Plessis-Allan Drive

Transport heavyweight Mainfreight has posted a solid full-year financial result, but international economic uncertainty is causing concerns.

Annual net profit was up nearly a third on the previous year - to  $274.3 million compared to $208.7 million.

Mainfreight General Manager Don Braid says the company's focused on business and what that means for customers around the world.

"We'll do whatever we can to keep the supply chains open for them."

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