Following the takeover, Buddle will be supported by Chua's deputy Wang Xiang-wei and managing editor David Lague.
SCMP said in a release that Chua joined SCMP in July 2009, and has been a valued leader of the editorial team which he managed alongside deputies Buddle, Wang and Lague.
The company did not mention his next move.
“Having been part of the South China Morning Post team for 16 years, I am delighted to take on this new challenge." Buddle commented. "It’s great to be a key part of Hong Kong’s most trusted and respected newspaper, particularly at this time in the industry when we’re developing some exciting new product enhancements for our readers.”