Chief executive Gus Mackay is to leave London Broncos.
Mackay, who has been with the club for more than three years, will depart at the end of the month.
"It was a difficult decision personally but the right one in the interests of the club," he said.
"In some ways the biggest achievement has come in the last six months. We saved the club from administration and closure, and found a new home so that the Broncos could survive."
The Super League strugglers faced financial problems and a search for a new ground during Mackay's spell at the club.
He presided over their all-important move to The Hive this year after they left The Stoop, which they had shared with rugby union side Harlequins for six years.
"I made a decision a while ago that I would step down once the club was operating again to the right levels," Mackay explained.
"The new structures are now in place and we are operating with a significantly reduced budget across the whole club. These changes had to be implemented to secure the future of the club.
"When I look back, I can honestly say that I have thoroughly enjoyed my time at the Broncos, despite all the challenges and the up and downs.
"It's a great club which shows amazing character and determination along with a never-say-die attitude from staff, players and the fans alike."