Tweedy, who has been at Platform since it formed in 1999, was placed on secondment to another role within The Co-operative Banking Group in March.
He is believed to have left when this secondment came to an end at the end of May – he is understood to have been helping with the bank’s acquisition of the Lloyds Banking Group branches.
Lee Gladwell, director of sales and proposition at Platform, is continuing to head up Platform in an acting role and the lender says a further announcement will be made in due course.
A spokesman for The Co-operative, says: “We would like to thank David for his work at Platform where he has played an integral role in making the business the success it is today. We wish him well for the future.”
Earlier today, the Co-operative denied that it was planning to close its intermediary lender Platform.
There were rumours that the Platform brand could be scrapped by the end of the year, but a spokesman for the bank told Mortgage Strategy this is not the case.
He says: “The Co-operative Bank remains absolutely committed to the intermediary market.
“We will continue to offer mortgage intermediary lending via Platform and have no plans to change that.”
He added that the lender will continue to review its approach to the mortgage market on an ongoing basis to ensure that it is best positioned to support needs of customers and intermediaries.
In February, the Co-operative Bank announced that it had placed 80 staff in consultation at Platform.
The bank is closing Platform’s London office in Canary Wharf on June 27 and relocating the departments to other locations, primarily in Manchester.
It could not comment as to how many staff have been made redundant as a result of the consultation.