The speed of the production pretty well matched the public timeline, Armstrong said. He pitched the idea to HBO chief Casey Bloys in December 2024, then wrote the script in January. Most of the cast signed on before Armstrong finished the script, and the production time was short.

Viewers will get an early look at Mountainhead, Jesse Armstrong's follow-up project to his hit series Succession.

“Mountainhead,” which “Succession” creator Jesse Armstrong wrote and directed, is a new made-for-HBO movie that leaves behind the backstabbing machinations of media moguls for the not-any-better power plays of tech billionaires.