Warner Bros. Discovery Inc., the parent of the Max streaming service, gained more subscribers than expected in the third quarter, boosted by its international expansion and suggesting its online business is picking up.

The New York-based media company, which also owns the CNN and TBS cable channels, added 7.2 million net streaming subscribers in the three months ended Sept. 30, the strongest quarterly gain since the platform's launch. Analysts expected 6.1 million, according to data compiled by Bloomberg.