Martinez joined the London-listed firm in 2011 and took on the finance chief role in 2012.
Lee Munro, currently APR’s senior vice president of strategy and systems, will take on the role on an interim basis until a permanent replacement is found. Munro, who joined APR in 2008, previously worked at US engineering giant General Electric for 11 years, becoming chief executive of its European operations services.
“APR Energy has embarked on a global search in order to identify the most suitable permanent candidate and will update the market on this process in due course,” said chief executive John Campion.
“The business continues to perform well and remains in line with our recent outlook statement.”
Martinez will remain engaged with the business through the delivery of the first half results, which remained scheduled for publication on 27 August, APR said.