Julian Roberts, CEO of Old Mutual PLC, WEF, Jan. 22, 2014
Old Mutual PLC appears to be in the process of splitting itself into new pieces. Above, Julian Roberts, CEO of the company from 2008 to 2015, smiles during a session at the annual meeting of the World Economic Forum in Davos, Switzerland, Jan. 22, 2014. Reuters/Denis Balibouse

Old Mutual PLC, the Anglo-South African financial-services firm, is plotting a 9 billion pound ($12.8 billion) breakup that could trigger a takeover battle for its various operations, Sky News reported.

Without citing sources, it said the group is working on a plan to divide itself into stand-alone companies based on its stake in the South African lender Nedbank Group Ltd., its U.K.-focused wealth unit, its emerging-markets operation based in South Africa and its institutional asset management business.

Sky News reported two private-equity firms, Cinven and Warburg Pincus LLC, are already said to have tabled a multibillion pound joint cash offer for Old Mutual Wealth.

A representative of Old Mutual declined to comment, as did representatives of Cinven and Warburg Pincus.

Old Mutual is due to publish full-year results March 11.

Its shares have fallen 21 percent over the past year, with the group hurt by a weak rand. They closed Friday at 178.6 pence, valuing the business at 8.83 billion pounds.