K-Rep was established in 1984 as a project that supported the development of Small and Micro Enterprises through NGO managed programs. In 1987, the project was incorporated as local NGO. It changed its original strategy of supporting NGOs with grants and technical assistance to that of advancing loans to the NGOs in 1989.
In the same year, it established a micro-credit lending program and established this as the core business and growth area. It also expanded its activities to include research & product development, as well as changing its Technical Assistance (TA) activities to a for-a-fee capacity building service.
In 1999, it established K-Rep Bank and two other entities; K-Rep Development Agency – to carry on its research and development work and K-Rep Advisory Services to serve as its consulting wing.
Headquartered in Nairobi, with assets of Ksh 13.2 billion as at March 31, 2014, it is now a full-service commercial bank providing an array of financial services to individuals, small businesses, middle-market companies, and major corporations. The bank operates 40 branches in all major towns across Kenya.
In early 2016, the bank rebranded and changed its name to Sidian Bank.