SMISA chair George Adam has decided to stand down from his position due to increased work commitments.
The Paisley MSP took up the role in 2015 and played a key role in both phases of fan ownership, helping Gordon Scott take over in 2016 and then being at the forefront of SMISA becoming majority shareholder in 2021.
George has been a popular and well-kent face at SMISA events over the past seven years but felt he could not longer commit the time required.
He said: "It has been a really difficult decision for me to take as St Mirren Football Club means so much to me.
"It has been too difficult for me to balance my work as Paisley’s MSP and now Minister for Parliamentary Business in the Scottish Government and still have the time to commit to SMISA and St Mirren.
"I have just had to admit that there is not enough hours in the day to do all of these roles and I began to think it would be better for colleagues on the SMISA board to get someone who could make that commitment.
"The trusts board members asked me to continue as they appreciated all the work I was doing but I felt I was not doing as much as I had been previously.
"It was difficult enough balancing the time as Paisley’s MSP but adding the responsibility of becoming a Scottish Government Minister just made it impossible for me to find the time.
"I tried for at least a year to make it work but I’ve had to now admit it is now time for another fan to move forward with SMISA.
"The SMISA fans' trust is in good hands at the moment as there are many people I have worked with over the years who I trust and believe in.
"I am happy that during my tenure as chair of the fans' trust, St Mirren FC has moved from the bottom of the Championship to sitting in third place in our country’s top tier.”