Over one third of all purchases made on Amazon are from third-party sellers.

Amazon CFO Tom Szkutak said that 39 per cent of the “product units” sold on Amazon during the most recent quarter were from third-party sellers, up from 36 per cent a year earlier, reports Wired.

These are goods not sold by Amazon itself, but by someone else selling through Amazon.

Szkutak added that unit sales on Amazon grew 32 per cent during the quarter.

The news comes after Amazon rival Play.com announced plans to close its retail business and focus solely on third-party marketplace sales from March.