The inquiry was launched after Kathryn Pugh, then head of policy, Avis Johns, head of development, and Lee Miller, head of training and consultancy, all left between June and September last year.
Barbara Herts, chief executive for the past three years, left the children's mental health charity last month (Third Sector Online, 4 December 2007), after the review was completed.
The charity, chaired by Dr Mike Shooter, declined to say anything about the departures. "This internal review was commissioned last year in line with best organisational practice in the third sector to inform the future direction of YoungMinds," said a statement.
"The review found that YoungMinds continues to be highly respected for its campaigning, policy and work to improve mental health outcomes for children, young people and their families across the UK."
Sarah Brennan, who has been working as interim deputy chief executive since last summer, is the acting chief executive while the hunt for a replacement starts.
Herts was unavailable for comment.