Sprint Corp. continued to add mainstream customers in the June quarter as its cancellation rate hit a record low, while the struggling wireless provider's loss was smaller than Wall Street expected.

Shares of Sprint, down 19.5% this year, added 4.8% in premarket trading.

The company said it added 310,000 mainstream customers in the quarter, compared with a loss of 181,000 customers in the prior-year period.

Sprint said it lost 12,000 phone customers in the quarter, though it added customers in both May and June, representing its first monthly phone additions in nearly two years.

Sprint's churn rate, a measure of service cancellations, for mainstream customers was 1.56%, the best in its history.

Sprint has been able to stanch the bleeding in its customer base recently, but concerns over its cash have circulated as the company needs money to further overhaul its lagging network and to bid in a key auction of wireless licenses expected for early 2016.

For the quarter ended June 30, Sprint reported a loss of $20 million, or a penny a share, compared with a prior-year profit of $23 million, or a penny a share.

Revenue fell 8.7% to $8.03 billion.

Analysts polled by Thomson Reuters forecast a nine-cent loss on revenue of $8.31 billion.

On Monday, Sprint said Chief Financial Officer Joseph Eutenauer would step down after holding the post for more than four years through a period of financial distress. He will be replaced by Tarek Robbiati, most recently the CEO of FlexiGroup Ltd., an Australian consumer-finance company.

Write to Chelsey Dulaney at Chelsey.Dulaney@wsj.com

Subscribe to WSJ: http://online.wsj.com?mod=djnwires

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