Amazon.com, Inc. (NASDAQ : AMZN) shares surged 9.8 percent on Friday after the e-commerce company reported a surprise second-quarter profit and a 20% jump in revenue.

Last year’s second quarter Amazon net sales went up to $19.34 billion. This year net sales rose to $23.18 billion in the second quarter. This represents a 20% increase in Amazon revenue which is better than expected. On the other hand, its shares rose $47.24, or 9.8 percent, to close at $529.42, giving the Seattle-based company a value of US$247,6 billion which compares with Wal-Mart’s US$230,5 billion market capitalization. (A company’s market value is calculated by multiplying the number of shares of stock it has in circulation by the current price of one share)

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Investors were pleased with Amazon’s ability to keep marketng and package delivery costs in  control while growing its revenue. Amazon credited the profit to continued strength of its cloud-computing business and strong revenue growth both domestically and abroad.

A variety of Amazon’s units boosted results: its $99 annual Prime membership, third-party sellers, and its logistics and delivery capabilities, according to William Blair analyst Mark Miller, who said, “When it is good, it is great: particularly as the business shifted to higher growth across a matrix of operating segments, product categories, and geographies in the second quarter,”

Amazon has solidified its dominance in e-commerce, forcing its big-box rival to play catch-up. Walmart is investing heavily in its Web operations and developing its own online subscription service to compete with Amazon Prime. Amazon’s market value has been steadily gaining on Wal-Mart’s. Amazon was already up 55 per cent this year through Thursday’s close, while Wal-Mart has slid 16 percent. However, Wal-Mart still dwarfs Amazon in terms of sales, with about five times its annual revenue.

Source: BLOOMBERG