A former Mitsubishi UFJ Securities Co. employee was arrested Thursday on suspicion of stealing client information through illicit access to the firm's database.
Hideaki Kubo, 44, whom the securities firm dismissed and reported to police in April, allegedly stole personal data on about 1.48 million clients by accessing the database using a colleague's identification codes and recording them on CDs between Jan. 26 and Feb. 4.
Kubo, who was a deputy manager at the Tokyo-based firm's computer system department, was in a position to know the IDs and passwords of several other employees as he had engaged in computer system development, the Metropolitan Police Department said.