Wasserman had been with the company for 14 years.
Stephen Wasserman has stepped down from managing director of West One to pursue other commercial interests.
Wasserman has been working as managing director of the group’s bridging division since West One was acquired by Enra Group in 2014.
He had been with the business for 14 years.
Danny Waters, chief executive of Enra Group,said: “Stephen worked hard to help grow our bridging division since we acquired West One.
“On a personal level I’m sorry to see Stephen depart having worked closely with him for many years, and I wish him all the very best for the future.”
Wassermanadded: “It was a very difficult decision to leave, but after much thought I decided the time was right to step aside.
“I believe Enra Group is well-positioned for further growth and has a very bright future as a major force in the specialist lending market.
“I wish everyone all the very best for the future.”