Toshiba Corp.’s Chief Executive Officer Satoshi Tsunakawa resigned Tuesday in the latest turbulent move at the firm, with his replacement pledging to move forward with a plan to split the company in two despite opposition from some investors.

Tsunakawa, 66, resigned following a board of directors meeting earlier in the day, and Taro Shimada, a 55-year-old executive officer and corporate senior vice president, succeeded him, the company said.

Shimada's appointment is on an interim basis, with the board of directors pledging to monitor his performance and suggesting it could appoint an external candidate instead. Tsunakawa will remain for now as chair of the board of the directors.