General Atlantic has put AKQA, a digital agency, on the block, according to Ad Age.
Morgan Stanley is advising on the auction, the report said. Potential buyers could include publishers to ad holding companies.
According to the report, which cited Stuart Smith, a U.K. blogger, Dentsu has made a $600 million bid for AKQA.
General Atlantic bought a majority stake in AKQA in 2007, around the same time that Francisco Partners cashed out. Francisco Partners invested $70 million in AKQA in 2001, the story said.
Also, The Wall Street Journal, in a story dated Sept. 20, reported that Rosetta LLC, another large digital ad firm, is in talks to buy Level Studios, a 15-year-old interactive marketing firm.
Lindsay Goldberg invested in Rosetta in 2007.