Operating income excluding stock compensation and acquisition-related costs, net, a non-GAAP financial measure, was $47.9 million in the fourth quarter 2013, compared with $13.7 million in the fourth quarter 2012.

Fourth quarter 2013 net loss attributable to common stockholders was $81.2 million, or $0.12 per share, including stock compensation and acquisition-related costs, net, of $34.5 million ($31.0 million net of tax). Fourth quarter 2013 results include a pre-tax non-operating loss of $85.5 million ($77.8 million net of tax) related to the impairment of a minority investment in China. Earnings per share excluding this impairment charge, stock compensation and acquisition-related costs, net of tax, a non-GAAP financial measure, was $0.04 per share.

Operating cash flow for the trailing twelve months ended December 31, 2013 was $218.4 million. Free cash flow, a non-GAAP financial measure, was $158.3 million in the fourth quarter 2013, bringing free cash flow for the trailing twelve months ended December 31, 2013 to $154.9 million.

At the end of the quarter, Groupon had $1.2 billion in cash and cash equivalents.

Full Year 2013 Summary

Gross billings increased 7% globally to $5.8 billion in 2013, compared with $5.4 billion in 2012. North America growth of 20% and EMEA growth of 3% was offset by a 14% decline in Rest of World.

Revenue increased 10% to $2.6 billion in 2013, compared with $2.3 billion in 2012. North America revenue growth of 31% was offset by an 8% decline in EMEA and a 15% decline in Rest of World.

Gross profit decreased 7%, to $1.5 billion in 2013, compared with $1.6 billion in 2012.

Adjusted EBITDA, a non-GAAP financial measure, was $286.7 million in 2013, compared with $259.5 million in 2012.

Operating income was $75.8 million in 2013, compared with $98.7 million in 2012.

Operating income excluding stock compensation and acquisition-related costs, net, a non-GAAP financial measure, was $197.2 million in 2013, compared with $203.7 million in 2012.

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