Amazon Rises After Sales, North American Margins Improve

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Amazon.com Inc., the world’s largest Internet retailer, surged after reporting gains in sales and North American operating margin as it benefited from investments in warehouses and a jump in holiday shopping.

Fourth-quarter sales climbed 22 percent to $21.3 billion, the Seattle-based company said yesterday in a statement. Analysts on average had projected $22.2 billion, according to data compiled by Bloomberg. Operating margin in North America widened to 5 percent from 2.9 percent a year earlier. Shares rose as much as 12 percent in extended trading.