Amazon.com continued to increase its sales last quarter but losses also mounted, to the growing consternation of investors.

Amazon’s overall sales were up 20 percent in the third quarter, amounting to $20.58 billion for the three months ended Sept. 30, the company said Thursday.

At the same time, however, Amazon’s losses reached $437 million, compared to a loss of $41 million in the same period last year.

That led investors to push its share price lower. Amazon’s shares were selling for $279  at the time of this report, down 11 percent from the close of regular trading.

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