Hewden chief executive Kevin Parkes will stand down by the end of January 2015.
Mr Parkes took over at Hewden in 2009 following its sale to private equity firm Sun European Partners.
He had formerly been a director at Finning (UK) Ltd.
During his time as CEO at Hewden, the firm launched its Core Fleet brand and further launches of both an accommodation and crane version of the scheme for next day services for plant and access products.
The firm also announced new services for London and the industrial sector.
Mr Parkes said: “It has been my pleasure to lead Hewden over the past six years. Through challenging times we have radically reorganised and rebuilt the business, relentlessly executing our strategy so Hewden is best placed to take advantage of the recovering market.”
He said he would offer support for the process of finding a new chief executive. The process is already underway and Hewden said it would make a further statement next month.
Hewden issued a statement which said: “Throughout his career Kevin demonstrated his commitment to Hewden, the wider construction equipment and plant hire industries.
“He made a strong contribution to the development and success of the company and was widely respected by his peer group, customers and colleagues. We wish him every success in his future career.”