By Greg Bensinger 

Amazon.com Inc. surprised investors by reporting an unexpected profit along with its sharp sales gains.

The Seattle online retailer reported a surprising profit of $92 million, up from a year-ago loss of $126 million. Sales rose a better-than-expected 20% to $23.18 billion.

Shares of Amazon jumped 14% to $550 in after-hours trading.

While Amazon's sales growth has kept investors happy--the stock is up more than 50% this year--it has slowed in recent quarters. In the past two years, Amazon was routinely turning revenue gains of 20% or more, but that dipped to about 15% late last year and in this year's first three months.

The bottom-line losses reflect Amazon's continued investment in business and services it thinks will yield more sales in the future. Amazon has been particularly focused on expanding its $99 Prime membership, adding new goodies like free same-day shipping in some markets.

Amazon reported revenue rose to $23.185 billion from $19.34 billion a year earlier. On a per-share basis, the company's profit was 19 cents, up from a loss of 27 cents in the year-earlier period.

Analysts had forecast a loss of 13 cents per share on sales of $22.4 billion, according to the average of estimates compiled by Thomson Reuters.

For the third quarter, Amazon said it expects net sales of between $23.3 billion and $25.5 billion, compared with sales of $20.6 billion in last year's period.

Write to Greg Bensinger at greg.bensinger@wsj.com

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