TOKYO—Mizuho Financial Group said on Friday its chief, chairman, and three other executives will resign as financial authorities reprimanded Japan’s No. 3 lender for a series of technical system failures. The Financial Services Agency (FSA), the country’s banking regulator, said in a statement the failures had “undermined the credibility of Japan’s bank settlement system”. Group CEO Tatsufumi Sakai and Chairman Yasuhiro Sato, as well as the head of the main banking unit and executives in charge of the group’s systems and compliance, will step down by April to take responsibility for the glitches, the bank said. Muzuho has not selected the next CEO and plans to leave the chairman post vacant. The FSA reprimanded Mizuho for eight system glitches that took place this year, despite a $3.6 billion overhaul of its systems in 2019. The regulator referred to governance problems at Mizuho, including an underestimation of the risks related to …