Mortgage Solutions understands Graves has not formally left SBG but has largely completed working for the business.
The business has created two roles to replace Graves – a director of Sesame and director of PMS – and also announced a series of moves within the senior management team which have taken effect already.
Jane Benjamin is moving from head of relationship management to director, mortgages.
Jeff Woods is moving from business development director to campaigns and propositions director.
Lauren Bagley is moving from marketing manager to head of business development.
All three will report into Martin Schultheiss, who took on a wider remit in May this year in his role as SBG chief operating officer.
Schultheiss has group-wide responsibility for strategy, operations, IT, HR, commercial and proposition development and reports into executive chairman John Cowan.
SBG executive chairman John Cowan said: “Our group has made significant progress in recent years and, on behalf of everyone at SBG, I would like to thank Mark for his important contribution and wish him well for the future.
“I’m also pleased to see Jane, Jeff and Lauren take-up their new roles at SBG, and I’m sure they will all continue to go from strength to strength.”
He added: “SBG has a strong and talented management team to take the business forward. We are committed to leveraging the strengths of our group and investing further, to ensure our advisory brands continue to evolve in a rapidly changing market, and help our members build successful customer-focused businesses.”