• 1990: the company was incorporated on December 20.
• 1991 : Diamond Bank Plc began as a private limited liability company on March 21.
• 2001 : In February, it became a universal bank.
• 2001 : Diamond Bank Benin was created
• 2005 :
In January , following a highly successful Private Placement share offer which substantially raised the Bank's equity base, Diamond Bank became a public limited company.
In May, the Bank was listed on The Nigerian Stock Exchange.
• 2008 : in January , Diamond Bank's Global Depositary Reciepts (GDR) was listed on the Professional Securities Market of the London Stock Exchange.
• 2011 :
Diamond Bank Senegal was created
Diamond Bank Côte d’Ivoire was created
Diamond Bank Togo was created
• 2013 : Diamond Bank (UK) Plc was created in London