Speaking at a press conference, Sompong said the nine have been arrested earlier this week at a rented house in Soi Khao Talo in Tambon Nong Plue, Bang Lamung district.
Police seized 17 desktop and notebook computers and mobile phones from the house.
He said the gang was headed by Lang Xiaobo, 27.
Sompong said the nine worked for a company based in China and they looked for Chinese customers to invest in gold and stocks.
The nine will be blacklisted and deported, he added.