Jeff Bezos' net worth reached US$105.1 billion ($146b) Monday on the Bloomberg Billionaires Index as Amazon shares added to a 12-month surge that's lifted the online shopping giant's market value by almost 57 per cent.
This fortune led Bloomberg to declare Bezos as the richest man in the history of the publication's records.
Amazon shares have risen 6.6 per cent this year, with a report showing the Seattle-based company captured 89 per cent of online spending among dominant holiday retailers in the five-week period beginning the day after Thanksgiving in the US.
The latest jump has pushed Bezos' fortune definitively above the high reached by Microsoft's Bill Gates in 1999.
The Amazon founder passed Gates in October with a net worth of US$93.8b and his fortune crossed US$100b for the first time a month later when the holiday shopping season kicked off on Black Friday.