The structure of the deal remains unclear but AT&T, which has a market value of about $230bn, is expected to control most of the combined entity. Discovery has a market value of $24bn.
AT&T's decision to merge its content division with Discovery comes five years after it agreed to take over Time Warner for $85.4bn as the telecom company looked to transform itself into the world's largest vertically integrated content and distribution company.
In 2019, AT&T chief executive John Stankey and Discovery chief David Zaslav discussed combining their programming into a single streaming service for about $8 a month (excluding HBO). But when Disney revealed it would offer up its massive trove of Star Wars, Pixar, Marvel and Disney classics for only $7 a month for Disney Plus, they scrapped the plan. Instead, Stankey combined HBO with the rest of WarnerMedia's programming to create one flagship streaming service, named HBO Max, which debuted in the US last year for $15 a month.
Discovery, the company behind HGTV, the Oprah Winfrey network and broadcaster Eurosport, in January launched a $5 a month streaming service, which Zaslav told the FT was "the most important new business" since he joined the company more than a decade ago.
HBO Max and Discovery Plus have made some traction in the streaming race. Discovery in April said it had reached 15m subscribers across its streaming business, while HBO Max signed up nearly 3m subscribers in the first quarter, reaching 9.7m retail subscribers by the end of March.
However, both companies are vying against much larger rivals: Netflix has 208m subscribers globally, while Disney Plus has lured 104m subscribers in only a year and half since launching.
WarnerMedia plans to launch HBO Max in Latin America and parts of Europe later this year.
Bloomberg first reported news of the talks between AT&T and Discovery. AT&T and Discovery declined to comment.
- Financial Times