Seven new members were also appointed and eight incumbents were reappointed by the chief executive.
Secretary for Commerce and Economic Development Algernon Yau said Jat has a strong legal background and extensive experience in public service.
A barrister, he had chaired both the Independent Police Complaints Council and the Minimum Wage Commission.
“I am confident that under his leadership, the commission will continue to spare no effort in safeguarding competition in Hong Kong to enhance economic efficiency and promote free trade, thereby benefiting consumers and all sectors,” he said.
Yau expressed gratitude to Chan, the outgoing chairman, for his contributions in leading the commission over the past six years with his dedication to promoting market competition and maintaining a fair business environment.
He also thanked other outgoing members for their contributions to the work of the commission.
Alongside Jat, new appointed members include Kelly Cheng, Terence Chong, Kwock Yin-lun, Michael Lai, Eric Sun, Winnie Tung and Judith Yu.
Reappointed incumbent members are Nicholas Chan, Calvin Chan, Fong Yuk-fai, Sabrina Ho, Matthew Lam, Billy Mak, Webster Ng and Symon Wong.
Their membership of the commission will also be effective from May 1.
