During Griffiths’ time, Kensington Mortgages became a £1bn-a-year lender in 2018.
His contribution to the industry was recognised at the 2018 British Specialist Lending Awards, where he won Business Leader of the Year in the Complex Credit Lender category.
Kensington said Griffiths’ last day would be 31 March. From then, Griffiths’ team will report directly to new business director Craig McKinlay.
Kensington said Griffiths is not taking-up a position elsewhere in the industry.
McKinlay said: “We would like to thank Steve for his many years of service at Kensington Mortgages and the incredible contribution he has made – not just to us, but the whole industry.
“Under Steve’s leadership we have grown from strength to strength and we are all very grateful for his invaluable work. We are sad to see him go but wish him nothing but the best for the future.
“Steve leaves behind a strong team which is well positioned for future growth. We’ll miss him immensely,” he added.
Griffiths said: “After 18 amazing years, I am leaving Kensington on the best of terms. The development and growth of Kensington and the sales team over the last few years is something I am very proud of, but now feels like the right time to move on.
“I am confident that I am leaving the team in a very capable set of hands. I would like to thank everyone for all their support and hard work and wish them all the best for the future.”