Palermo fans celebrate their promotion from Serie C last month
Palmero, who were in Serie A in 2016-17, have won two promotions in three seasons having dropped to the fourth tier after going bankrupt.
The City Football Group owns 11 clubs.
The others are New York City, Melbourne City, Yokohama F Marinos, Montevideo City Torque, Girona, Sichuan Jiuniu, Mumbai City, Lommel SK and Troyes.
CFG chief executive Ferran Soriano said: "Palermo is a great and historic club with a strong and proud identity.
"This is a very special club, and our role will be to add value to all of the things which make it so special and steadily improve performance on and off the pitch, using our experience and know-how."
-- Courtesy of BBC Sport