In its first indication of performance for the year's peak online shopping days, Amazon said more than 71,000 small- and medium-sized businesses worldwide had surpassed $US100,000 ($A135,000) in sales this holiday season to date.

The Seattle-based company did not give a breakdown of US sales or its own numbers for the weekend, nor for either of the two big shopping days, saying only that the holiday season overall had been its biggest ever.

Latest industry estimates overnight showed Cyber Monday on course to be the biggest online shopping day ever for the United States, garnering up to $US11.4 billion ($A15.5 billion) as the COVID-19 pandemic prompted consumers to stay at home and turn to the internet for their holiday shopping needs.

The robust performance comes despite nearly two months of offers since Amazon held its Prime Day sales event in October, with retailers seeking to recoup business lost during this year's coronavirus-driven closures of malls and stores.

Estimates from Adobe Analytics showed this year's conclusion to Thanksgiving weekend sales would come in between $US10.8 billion ($A14.6 billion) and $US11.4 billion ($A15.5 billion).

While that was down from an earlier estimate of as much as $US12.7 billion ($A17.2 billion), it still easily surpasses this year's Black Friday figure of $US9 billion ($A12.2 billion), the strongest online sales result for the day ever, as well as last year's Cyber Monday total of $US9.4 billion ($A12.7 billion).

Australian Associated Press