Zoomlion Heavy Industry Science & Technology, seeking to boost investor confidence after an anonymous letter questioned its sales, said business surged last year after it offered new products and hired more people.
"We achieved growth in 2012 because some of our products gained market share," Zhan Chunxin, the chairman of the mainland's second-biggest construction-equipment maker, said last week. "Zoomlion is a company with integrity."
GPS tracking devices were installed on every machine sold and employees met each client to ensure there were no fabricated sales contracts, said vice-president Hong Xiaoming.
Zoomlion is trying to allay concerns over its accounts as Chinese firms' finances draw increased scrutiny after short seller Muddy Waters uncovered irregularities, including those at now-bankrupt Sino-Forest.
Zoomlion, based in Changsha, last year introduced lighter and longer concrete pumps with sections made from carbon fibre, Zhan said.
The company had 31,018 workers by the end of June last year, 7.6 per cent more than at the end of 2011, according to the company's annual and interim reports.
