I’ve been collecting ebooks for years, and I’ve noticed that most major publishers offer epub formats these days. Big names like Penguin Random House, HarperCollins, and Macmillan usually release their titles in epub alongside other formats. Smaller indie presses like Tor and Baen also support epub, especially for sci-fi and fantasy fans.
I’ve had great luck with publishers like Orbit and Gollancz for genre fiction, while academic publishers like Oxford University Press often provide epub versions of their works too. Some niche publishers, like Viz Media for manga, even offer epub editions of translated works. It’s worth checking the publisher’s website directly since distribution platforms sometimes limit formats.