Amazon’s 2016 second-quarter financial statements for the period ending June 30 showed robust growth, extending its profitability to a fifth straight quarter after years of spotty results.

Revenue was $30.4 billion compared to $23.2 billion in the second quarter of 2015, an increase of 31 percent. Operating income was $1.3 billion in the second quarter, compared with $464 million in the second quarter of 2015, an increase of 177 percent. The company posted an operating margin of 4.2 percent, compared with 2.0 percent in the prior year second quarter. Unit sales growth increased 28 percent over the same period in 2015.

Source: Amazon Juggernaut Rolls; Third-party Sellers Benefit | Practical Ecommerce