Nigeria, June 12 -- Dangote Sugar Refinery Plc said its chairman, Aliko Dangote, will retire from the board on 16 June after nearly 20 years in the role.

Two non-executive directors, Maryam Bashir and Konyinsola Ajayi, a professor, will also step down on the same day.

The company made the announcements in separate filings to the Nigerian Stock Exchange, signed by its company secretary, Temitope Hassan, on Wednesday.

The company described the changes as part of planned board transition in line with corporate governance principles.

Mr Dangote, a founding director, has led the board since 2005. During his tenure, the company pursued major expansion through its backward integration projects and remained one of Nigeria's largest sugar prod...