HBO saw more than half of its adult 18-49 linear audience disappear last year – months on from the conclusion to Game Of Thrones in 2019.
Linear viewing on the US premium network saw an overall demographic drop of 38 percent.
Other US networks including Starz, which airs programmes including Power, and Showtime (Homeland), were also hit with declines of 16 percent and 19 percent respectively.
Reports that it was not all bad news for linear viewing, however.
Cable news networks including CBS, NBC, ABC and Fox were high up on the list owing to big stories in 2020 – from the Coronavirus pandemic to the US presidential election.
Fox News Channel reported a 43 per cent increase in viewing figures.
The 50 top-rated networks of 2020 by adults in the 18-49 age range shows that HBO suffered a 52 per cent drop.