Published Friday, 15 February 2013
The Bleeding Love hitmaker has been with Modest! Management Ltd. since she hit the bigtime following her win on The X Factor in 2006.
The split comes after Lewis' third album, Glassheart, became her first record not to make number one in Britain.
However, Lewis insists she has parted ways on good terms with her former team, saying: "I greatly enjoyed my time working with Modest!
"They played an important role in my career and I’ll always be grateful. I’m looking forward to a new chapter in my career.”
The singer is not the first former The X Factor contestant to leave the management group - Rebecca Ferguson parted ways with the company last year, and has since been hit with a lawsuit for terminating their five-year contract prematurely.