While the company said it had received unanimous approval from competition authorities across the world, the long running takeover process has featured controversy since the beginning.

Netflix initially had a deal to buy part of Warner Bros Discovery, but Paramount Skydance launched a bidding war, leading to the streaming giant walking away.

Lawyers in about a dozen US states then filed lawsuits - led by California - aiming to block the deal, arguing it would stifle competition, raise consumer prices and cause "substantial" harm to movie theatres, cable distributors and "ultimately, audiences nationwide".

US states announced a settlement with Paramount and Ellison last month which paved the way for the merger to go ahead.

As part of the deal, Paramount has agreed to establish a "news editorial independence board" to "ensure independent, objective, fact-based reporting" at CNN and CBS.

Politics and editorial independence has become an area of concern at CBS since the news broadcaster was taken over in 2025 as part of separate a merger between Skydance Media and Paramount.

Ellison, who hosted a dinner for President Donald Trump earlier this year, has sought to reassure people that editorial independence will be maintained.

Over its 103-year-old history, Warner Bros has won more than 100 Academy Awards - including dominating at last year's show with a record-tying 11 Oscars for One Battle After Another, Sinners and Weapons.

Paramount traces its roots back 1912 and also boasts more than 100 Oscars for classics spanning from The Godfather to Titanic, though the studio has not mirrored the same recent spate of Hollywood honours.

The studio was not nominated for any projects last year by the Academy. Its last win came in 2022 with Top Gun: Maverick.

The deal with US states aims to ensure the merged studios will produce "real, robust movies" that will generate economic activity and put people back to work, said California Attorney General Rob Bonta, who led the lawsuit and settlement.

To prevent the studio from fulfilling its annual quota with low-budget or automated content, the deal includes strict guardrails against "AI-generated" films.

As part of the agreement, Paramount must release at least 30 films each year. If it fails to meet its annual production quota, it will be forced to sell its 49% stake in Miramax, the film company founded by disgraced Hollywood mogul Harvey Weinstein and his brother Bob.

Paramount also must ensure 20% of all film production takes place in the US for the first two years, rising to more than 30% through the following three years.

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