The US online retail colossus said this capped off a year when it helped its third-party sellers ship more than 1bn items.

More than 23 million items were ordered worldwide from sellers on Amazon on Cyber Monday, an increase of more than 40 percent from the online marketplace’s 2014 Cyber Monday sales, Amazon announced on Tuesday.

Meanwhile, Amazon’s investments in its “Fulfillment By Amazon” service seem to be bearing fruit, with 1 billion items delivered in 2015 for businesses selling on Amazon.

It also added new tools to help sellers save time and manage their advertising spend, including Bid+, an API, and Bulk Sheet uploads.

Shares of Amazon were down $3.41, or less than a percent, to $633.55 at 11:15 a.m. in NY.

Seattle-based Amazon doesn’t release specific sales figures on the overall holiday season. “We’re excited to build on that momentum as we continue to innovate on behalf of sellers and customers”. Sponsored products grew by over 100% in 2015, Amazon says. Amazon said it also sold more than twice as many of its own branded devices during the 2015 holiday season compared to the year before. The growth in sellers using FBA jumped 50 percent, though that’s slower than last year’s 65 percent growth. It also launched a number of new seller tools and services.

While it might be tempting for sellers to join, the program is not for everyone, according to ShipRush which supports the program – you can find more information in this November Newsflash article.