By Annie Gasparro 

Whole Foods Market Inc. reported a 5.8% increase in quarterly earnings and said its efforts to attract more customers with lower prices and nifty technology are making headway.

The natural- and organic-focused grocery chain has struggled over the past year as mainstream supermarkets like Kroger Co. and Wal-Mart Stores Inc. are selling more natural and organic foods and other high-end supermarkets pop up nationwide. The company was forced to cut its outlook four times over the year for fiscal 2014, which ended in September.

Its shares had fallen 37% through Wednesday's close. But in after-hours trading they were up 7% after the company said its sales in the current quarter were off to a strong start. Comparable-store sales, or sales at stores open at least year, were up 4.6% from the year-earlier period.

Co-Chief Executive Walter Robb said lower prices and efforts to emphasize value are working, as are technology initiatives like grocery delivery through Instacart and the company's acceptance of Apple Pay.

"All of these things are driving an increase," he said on a call with investors. "This is a legitimate--a real--increase, and we're really pleased to see it happening."

Whole Foods also recently launched its first national TV commercials and announced a loyalty program.

For more than two years, Whole Foods has been working to shed its image as an overpriced grocer by offering better deals. But lowering its prices has cut into sales and profit margin.

For the period ended Sept. 28, Whole Foods' comparable-store sales rose 3.1%, in line with its expectations, but marking its worst growth rate in over four years.

It "was a challenging year on many fronts. We faced a dynamic competitive landscape, a lukewarm economy, and headwinds from our own growth and value initiatives," said co-Chief Executive John Mackey.

Whole Foods posted profit of $128 million, or 35 cents a share, for the quarter, up from $121 million, or 32 cents a share, a year earlier. Revenue rose 9.4% to $3.26 billion. The company expected a per-share profit of 31 cents to 33 cents and sales growth of 8.5% to 9.5%.

Gross margin fell to 35.4% from 35.7%, and will continue to be pressured by lower prices.

For the recently started business year, the company forecast revenue growth of more than 9% and said earnings may grow at a slightly higher rate. Analysts polled by Thomson Reuters, however, expected a 12% increase in revenue and an 11% rise in earnings.

Write to Annie Gasparro at annie.gasparro@wsj.com

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