The head of one of Britain's biggest outsourcing groups is to step down after a string of profit warnings led to its ejection from the FTSE 100.
It came as the group reported a 33% fall in pre-tax profits to £75m for 2016 amid a slowdown in central government outsourcing and delays in client decision making which were "likely compounded" by the Brexit vote. Shares (Berlin: DI6.BE - news) fell 9.1% by the close.
A number of big City shareholders in Capita have been demanding Mr Parker's scalp for several months, and have told the company's respected new chairman, Sir Ian Powell, that they want to see a change in leadership.
The announcement of his departure came a day after a quarterly review confirmed that the group was to be relegated to the FTSE 250 following its slump in value.
Shares in Capita have sunk by more than 40% over the past 12 months, with fellow outsourcers including Mitie and Serco also experiencing tough trading conditions and the legacy of poor corporate decision making.
Sir Ian, who said he had worked closely with Mr Parker since he started as chairman at the beginning of this year, said the chief executive had "made a significant contribution throughout his career at Capita".
Announcing his departure, Mr Parker - who will continue in his current role for now - said 2016 "has been a difficult year" but that it was now a "simpler, more focused group".
He added: "We have achieved a great deal but going forward it is time for a new leader to take Capita through the next steps to renewed and sustainable organic growth."
Mr Parker has run the company since 2014 and joined the board in 2011.
The company was heavily criticised earlier this week over its behaviour when carrying out its TV Licensing contract, with Lord Hall, the BBC director-general, demanding urgent answers from Capita.
Last week, Capita said it would take a £50m charge on a range of contracts but insisted it would have "no adverse impact on cash or future trading".