The forecast: Amazon Business, which has grown rapidly since its launch in 2015, will increase its US product sales by 43.5% year over year to reach $27.59 billion in 2021.

Dive deeper:

• Amazon Business offers a B2B ecommerce platform similar to its consumer-facing website.
• Last year, Amazon Business brought in $19.23 billion in US product sales.
• In 2016, the first year in our forecast period, the division netted $2.96 billion. The next year, sales nearly doubled, increasing to $5.87 billion. Growth has been stable ever since, at roughly 50% each year.
• Amazon Business continues to grow, but it will hold only 1.7% of overall US B2B ecommerce site sales this year, according to our estimates. For context, we forecast that total US B2B ecommerce site sales will hit $1.583 trillion in 2021.

Looking ahead: Amazon Business will continue to enjoy relatively high growth for the next few years and more than double its product sales between 2021 and 2025 to exceed $59 billion.