The former Npower marketing director joined as director of brand, sponsorship and corporate responsibility in December, overseeing Aviva's UK advertising and sponsorship portfolio.
Peake is understood to have left the interim role in the past fortnight. It is not known whether he has another job to go to.
An Aviva spokeswoman confirmed that, as part of a wider restructure of its management being led by newly appointed director of group transformation David McMillan, Peake will not be directly replaced.
Instead, his responsibilities will be split between head of corporate sponsorship Sarah Loughran and global head of brand Virginia Barnes, who report to global marketing director Jan Gooding.Follow @alex_brownsell