Nelson left The Money Portal, which owns Bates Investment Services, on Friday for personal reasons.
Three days earlier, BIS chairman and founder Graham Bates and his sister managing director Helen Peace were sacked by TMP chief executive Richard Craven for gross misconduct follow-ing a two-week investigation. Bates and Peace are to appeal against the decision.
A statement from Craven confirmed that Nelson had left the firm and that the departure would not affect the advice side of the BIS business.
TMP, which was established in 2003, is pursuing an aggressive policy of growth both organically and through acquisitions. It has so far bought Willis Owen, The Isa Shop, The With-Profits Bond Shop and BIS.
Craven says: “Kerry Nelson has resigned due to personal reasons and her resignation has been accepted.
“She has made a significant contribution to TMP in her time here and we wish her well in the future.”
Nelson was unavailable for comment.