Police detained Yalova Chamber of Commerce and Industry (YTSO) chairman along with its 4 board members as part of an investigation into the Gulen movement, on Wednesday.
YTSO board consists of 8 individuals.
On May 10, at least 7 people were detained in a Yalova-based operation; two of them are former board members and the remaining current executives at YTSO including the chairman.
The detainees are accused of having deposited money into the now-defunct, Gulen-linked Bank Asya.
Turkish authorities put the blame for the July 15 coup attempt and have detained more than 120,000 people over alleged or real ties to the movement so far.