Investment bank UBS is currently in the early stages of a strategic review of All3Media for its owner Permira, including options for £650 million sale.
According to The Observer, initial expressions of interest have already been submitted from US firm Providence Private Equity, along with Apollo Global Management and the television arm of Sony Pictures.
Apollo is currently expanding its operation, including this month's $509m (£312m) acquisition of CKx, the entertainment company behind American Idol and So You Think You Can Dance.
Providence already invests in video on-demand venture Hulu, alongside News Corp, Disney and NBC Universal. The company is in the process of selling its stake in Warner Music following Len Blavatnik's $3.3bn takeover.
Sony Pictures Television is thought to be interested in strengthening its production division after recently selling its 20% stake in Elizabeth Murdoch's Shine Group as part of its acquisition by News Corp.
Permira, which bought into All3Media in 2006, is exploring a range of options for the company, but is thought to favour an outright sale.
All3Media has performed well so far this year, including BAFTAs for ITV shows The Only Way is Essex and The Cube, along with record ratings for MTV for new scripted reality show Geordie Shore.
Permira is hoping to secure a price of more than £750m for All3Media, but many analysts believe that around £650m would be a fairer level of transaction. ITV was previously thought to be in the running, but the firm is understood to have been put off by the high asking price.