Amazon.com Inc AMZN reported fourth-quarter financial results after the market close Thursday.

Here are the key highlights.

What Happened: Amazon.com reported fourth-quarter net sales of $187.8 billion, up 10% year-over-year. The net sales beat a Street consensus estimate of $187.3 billion according to data from Benzinga Pro.

The company reported fourth-quarter earnings per share of $1.86, beating a Street consensus estimate of $1.48.

By operating segment, here were the net sales:

• North America; $115.6 billion, +10% year-over-year
• International: $43.4 billion, +8% year-over-year
• AWS: $28.8 billion, +19% year-over-year.

The company reported operating income of $21.2 billion in the fourth quarter, up from $13.2 billion in last year's fourth quarter. Here was the operating income breakdown by segment, with last year's fourth-quarter total in parentheses:

• North America: $9.3 billion ($6.5 billion)
• International: $1.3 billion (loss of $400 million)
• AWS: $10.6 billion ($7.2 billion)

"The holiday shopping season was the most successful yet for Amazon and we appreciate the support of our customers, selling partners, and employees who helped make it so," Amazon CEO Andy Jassy said.

"When we look back on this quarter several years from now, I suspect what we'll most remember is the remarkable innovation delivered across all of our businesses."

For the full fiscal year, Amazon's net sales were up 11% year-over-year to $638 billion. North American segment sales were up 10% year-over-year for the full year, with International segment sales up 9% year-over-year for the full year. The company's AWS segment saw full-year sales of $107.6 billion, up 19% year-over-year.

Amazon said it had a record-breaking Black Friday week and Cyber Monday. The company also highlighted its "Thursday Night Football" full-season average of 13.2 million viewers, up 11% year-over-year.

New AWS agreements were signed with the U.S. Army, Intuit, PayPal, Norwegian Cruise Line Holdings Ltd., Northrop Grumman, Medtronic, The Guardian Life Insurance Company of America, Reddit, Japan Airlines, Baker Hughes, The Hertz Corporation, Redfin, Chime and Asana, according to the company.

Read Also: Amazon.com Q4 Earnings Preview: Analyst Says Could Be ‘Upside On Every Metric’

What's Next: Amazon is guiding for first-quarter net sales to come in a range of $151 billion to $155.5 billion, up 5% to 9% year-over-year. The figure falls short of the $158.5 billion expected by the Street.

Amazon said there could be an unfavorable impact of $2.1 billion from foreign exchange rates in the first quarter along with the impact of a Leap Year, which it said could be around $1.5 billion in net sales.

Guidance calls for first-quarter operating income to be in a range of $14 billion to $18 billion versus $15.3 billion in last year's first quarter.

Jassy highlighted the company's new Trainium 2 AI chip, new foundation models and other new products that could help guide the future.

"These benefits are often realized by customers (and the business) several months down the road, but these are substantial enablers in this emerging technology environment and we're excited to see what customers build," Jassy said.

AMZN Price Action: Amazon stock is down 2.14% to $233.72 in after-hours trading Thursday versus a 52-week trading range of $151.61 to $242.52.

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