Now: Pensions chief executive and founder Morten Nilsson has left the business with chief financial officer Troy Clutterbuck taking over on an interim basis.
Nilsson founded the auto-enrolment provider in 2011.
A statement from the company says the board decided it was the right time to change the executive management as the first phase of auto-enrolment comes to an end.
Last month Now: Pensions withdrew from the master trust assurance list of providers for auto-enrolment while it resolves issues with processing contributions.
Money Marketing also reported in July that Now: Pensions had experienced delays in processing contributions for a “small percentage” of clients, largely due to a change in its third party administrator.
Clutterbuck joined the business in August 2016 from Jardine Lloyd Thompson Group where he was previously chief financial officer for UK employee benefits.
Chairman of the board of trustees Nigel Waterson says: “Morten Nilsson has made a huge contribution not only to the success of Now: Pensions, but to the whole automatic enrolment project in the UK. He leaves an indelible legacy in the UK pensions sector.”