Nisa directors Harris Aslam and his cousin Raza Rehman have left the board following an investigation into a data leak.
The investigation, carried out by forensic data experts, found that a file of Nisa members’ contact information had been shared.
Both parties did not understand that doing so was a mistake, Nisa chairman Christopher Baker said.
Nisa was now implementing “wide ranging changes to increase data security and educate both staff and members on best practice,” he added.
The investigation also looked at the integrity of the voting processes for the 2014 AGM and for the two preceding annual meetings.
Work on the verification of voting is continuing and is nearing completion.
Harris Aslam owns four Nisa stores in Fife, Scotland.