Amazon has briefly become the second US-listed firm to have a market value of more than $1 trillion (£779bn).
Shares in the e-commerce giant rose nearly 2% to a high of $2,050.50 in morning trade before slipping back.
Apple reached the same milestone in early August.
Founded in 1994, Amazon is now the world's largest online retailer. Its chief executive, Jeff Bezos, is the world's richest man, with a net worth of more than $160bn.
Neil Saunders, managing director of GlobalData Retail, said: "To reach a market capitalisation of over $1tn is impressive. To do it in a little over 24 years is extraordinary.
"That Amazon has achieved this demonstrates its dramatic advancement in both the retail and technology sectors, as well as the influence it now wields over large parts of the consumer landscape."
Amazon reported nearly $53bn in sales in the three months ended in June, with record quarterly profit of $2.5bn.
The firm is expected to account for roughly half of all online shopping sales in the US this year - and nearly 5% of the country's overall retail market, according to research firm eMarketer.
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