Mr. Ngaine is the chairman and was instrumental in the establishment of then Sterling Securities Ltd in 1994.He became its first Managing Director following its licensing as a Stockbroker by the CMA. He has been an active member of the NSE including being a director in 1994/95 as well as 2008-2011. He was also the Chairman of the Association of Kenya Stockbrokers in 1998/99 Mr. Ngaine has previously worked in senior positions with Gailey & Roberts, Esso, Standard Kenya Ltd, IDB (Industrial Development Bank) and also as Director of Fiscal and Monetary policy at the Treasury. As Director of Fiscal and Monetary policy, he represented the Treasury in the boards of IDB, Consolidated Bank, E.A. Portland Cement, Pan African Mills, Retirement Benefits Authority, Stanbic bank and Capital Markets Authority. Major work experience includes financial restructuring, consolidation, rehabilitation schemes, valuation of state owned enterprises, share valuation of quoted & unquoted companies, sponsoring IPO, tax policy & analysis and tax modeling and forecasting.

He is presently a commissioner in the Energy Regulatory Commission (ERC)