WarnerMedia's streaming platform, including HBO, would include over 10,000, according to Ampere Analysis.
As companies remove licensed titles from Netflix and Amazon, HBO/WarnerMedia could be at a disadvantage.
Comcast relinquished operational control of Hulu to Disney on Tuesday, and agreed to sell its 33% stake in the streaming service to Disney in five years.
READ MORE: Disney revealed the details of its Netflix rival, Disney Plus, including its price and release date
Disney is also launching its own streaming platform, Disney Plus, in November at $6.99 a month, and said last month that it will likely bundle the service with Hulu and ESPN Plus at a discount.
HBO Go/Now, the streaming service included with your paid HBO cable subscription (or available over-the-top), has less than 5,000 hours of content.