posted quarterly revenue that fell short of analysts' estimates on Thursday and its shares fell almost 10 percent.

Net income in the global online retailer's fourth quarter was $416 million, or 91 cents per share -- up from $384 million, or 85 cents per share, a year earlier.

Revenue was $12.95 billion. Analysts on average forecast $13.01 billion.

For the first quarter, Amazon said it expects revenue between $9.1 billion and $9.9 billion and operating profit between $260 million and $385 million, including $140 million for stock-based compensation and asset amortization.

Wall Street expects revenue of $9.31 billion, according to Thomson Reuters I/B/E/S.

Amazon shares traded at $166.29, down 9.8 percent, following the earnings report, after rising more than 5 percent to end at $184.45 on Nasdaq Thursday.

(Additional reporting by Brad Dorfman; Editing by Gary Hill)