Staprix NV, owned by Belgian businessman Roland Duchatelet, have successfully completed the takeover of Charlton.
Staprix NV, who own four football clubs including Belgian side Standard Liege, are to acquire 100 per cent of the club's shares.
Richard Murray will become the Addicks' non-executive chairman and he told the club's official website: "I look forward to using my long experience in English football to continue to represent the club that has been my passion for many years.
"Charlton can benefit from Roland's experience in many different ways."
Chairman Michael Slater, Tony Jimenez and Martin Prothero will step down from the club's board of directors.
Slater said: "In every important respect we leave the club in a far better state than when we took over three years ago, but now is the time to pass the baton to Roland who has a proven track record of success in business and football.
"We believe we have found an investor with extensive knowledge of football who is well placed to stabilize the club in the Championship and help the club to develop on a sensible commercial basis."