The May 30 finale of “Mare of Easttown” drew four million viewers across Memorial Day Weekend, with nearly three million viewers Sunday night on all HBO platforms, marking a series high for the WarnerMedia premium cabler’s linear and digital outlets. The series stars Oscar, Emmy and Golden Globe-winning actress Kate Winslet from creator Brad Ingelsby (“The Way Back”) with all episodes directed by Craig Zobel, who previously worked with HBO on “The Leftovers” and “Westworld.”

The seventh episode of the limited series focused on the fictitious but realistic family of Easttown in Pennsylvania, titled “Sacrament,” set a record as the most-watched episode of an HBO original series on the network’s streaming platform during its first 24 hours of availability. It bested the finales of recent HBO hits “The Undoing” and “The Flight Attendant” over the same period of time. “Mare of Easttown,” which first dropped on Sunday, April 18 on HBO,...