By Chelsey Dulaney 

Staples Inc. on Wednesday warned that it could book a loss on a possible card-data breach disclosed in October, even as the as the office-supplies chain posted fiscal third-quarter results that were mostly in line with expectations.

Staples said it believes it has identified the malware used in the breach, which impacted some of its retail point-of-sale and computer systems. Staples said it is working with law enforcement, and that it can't yet estimate its losses related to the incident.

The possible breach follows a string of costly data-security issues at retailers such as Home Depot Inc. and Target Corp.

Staples shares climbed 3.5% in premarket trading.

Staples said it is accelerating plans to close underperforming stores and spark online sales growth, as sales have slumped and traffic has fallen in the face of stronger competition online and weaker demand for traditional office supplies.

The company has broadened its product selection recently and worked to beef up its online presence. The company has also been closing stores, with 127 closures so far this year. Staples on Wednesday said it plans to close 170 stores in North America this year, up from the 140 stores it said it planned to close in August.

Staples is also looking to downsize locations, as several products, such as tablet computers, take up less space than the usual sort of office supplies, such as filing cabinets and desktop computers.

For the quarter ended Nov. 1, Staples reported a profit of $216.8 million, or 34 cents a share, compared with a profit of $135.2 million, or 21 cents a share, a year earlier. Excluding restructuring and other charges, earnings were 37 cents a share.

Sales fell 2.5% to $5.96 billion.

The company in August had projected earnings of 34 cents to 39 cents a share and a decline in sales for the quarter, which includes the crucial back-to-school shopping period. Analysts polled by Thomson Reuters were expecting $5.93 billion in revenue.

Excluding the impact of closed stores and foreign exchange rates, sales edged up 0.5% in the quarter. North American same-store sales fell 4%, reflecting a decline in traffic and flat average order size. Meanwhile, sales through Staples.com rose 9%.

Staples said its commercial operations in North America posted a 3.3% increase in sales to $2.16 billion, reflecting higher demand for facilities and break-room supplies, among other products. Ink and toner sales declined in the segment, however.

For the current quarter, Staples said it expects to posted adjusted earnings of 27 cents to 32 cents a share and a decline in sales. Analysts polled by Thomson Reuters had recently projected earnings of 31 cents a share and a 2% decline in revenue.

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

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