Honister Capital group chief executive Richard Pearson is to step down after just a year in the role.
Pearson replaced Mark Lund in February last year and has worked at the company since it was formed in 2009, after The Money Portal went into administration.
Pearson said he is leaving the business to "pursue other opportunities".
He will be replaced by Group CFO Colman Moher who will take the new position from 1 April.
Just last month Honister announced that Moher would replaced Bryan Levine as chief financial officer, who stepped down as a director of the company due to a long-term illness.
In addition, Martin Scott will be appointed as chief information officer and Martin Hargreaves as finance director designate. Both are internal promotions and will take effect immediately.
The restructure coincides with the implementation of a new charging structure at the company based on a combination of fixed and variable fees.
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