July 25 (Reuters) - Charter Communications reported a higher-than-expected broadband subscribers loss in the second quarter on Friday, as the cable giant grappled with competition from wireless carriers that are bundling high-speed internet services with 5G mobile plans.

Shares of the company CHTR.O fell 8% in premarket trading.

Charter's internet customers decreased by 117,000 in the April-June period, compared with a 60,000 losses in the prior quarter. Analysts had expected it to shed 73,240 customers, according to Visible Alpha.

Traditional telecom carriers such as AT&T T.N and Verizon VZ.N are rapidly building out their fiber networks to package internet with wireless plans at a discount, which is appealing to high-value customers in urban and suburban markets.

AT&T has been aggressively expanding its fiber build and aims to reach more than 60 million fiber locations by the end of 2030, powered by the acquisition of Lumen's mass markets fiber business.

Charter added 500,000 mobile lines, compared with expectations for a rise of 538,450 customers.

In May, Charter had agreed to acquire privately held rival Cox Communications for $21.9 billion. The deal would position Charter as the largest cable TV and broadband provider in the U.S., with around 38 million subscribers, surpassing the current market leader, Comcast.

Earlier this week, Charter and Comcast announced a multi-year agreement to establish a mobile virtual network operator that will use T-Mobile's TMUS.O 5G network to serve wireless business customers, with a commercial launch set for 2026.

Revenue for the second quarter came in at $13.77 billion, inline with analyst estimates of $13.76 billion, according to data compiled by LSEG.

(Reporting by Harshita Mary Varghese in Bengaluru; Editing by Shilpi Majumdar)

((HarshitaMary.Varghese@thomsonreuters.com;))