Commonwealth Bank chief Matt Comyn is targeting further gains in business lending after the bank grabbed market share in the March quarter, and has his sights set on key sectors including infrastructure, healthcare and residential home building.

Business loans at CBA surged by 9.1 per cent, or $3.7 billion, over the three months to the end of March compared to the quarter before, according to a market update on Wednesday. That was 1.3 times the average of the other banks, and Comyn is keen to build on market share gains made on National Australia Bank, the nation’s top business lender.