Shares of Amazon.com rose 3. 6 percent, or $2,59, to end regular trading at $73.50 after the Seattle-based Internet giant announced plans...

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Shares of Amazon.com rose 3.6 percent, or $2,59, to end regular trading at $73.50 after the Seattle-based Internet giant announced plans to buy back up to $1 billion of its stock in the next two years.

The plan replaces a previous $500 million stock buyback program.

Amazon also said its board of directors authorized a plan to repurchase $1.25 billion in debt securities, replacing an earlier $500 million debt buyback program.