Warren Buffett may consider asking Jeff Bezos for a loan after the Amazon.com, Inc. (AMZN) CEO last week ascending to become the world's third-wealthiest person, leaving the Berkshire Hathaway Inc. (BRK.A) (BRK.B) CEO now at No. 4.

Bezos, founder of Seattle-based Amazon, is now worth an estimated $65.1 billion as of Thursday, according to Bloomberg's Billionaire Index (BBI), narrowly edging out Buffett's $65 billion. As it stands, only  Microsoft Corporation (MSFT) chairman Bill Gates and Amancio Ortega, the majority owner of Zara's parent company Inditex, stands in the way of Bezos' rise to the top spot. 

Shares of Amazon are trading at near all-time highs and have risen 10% year to date, including 20% over the past three months. Meanwhile, Berkshire Hathaway -- though up about 10% year to date --has lost some 1% during that span in three months, sending Buffett's net worth down $754 million, according to the BBI. 

To be sure, despite Amazon's rally, it could be argued Bezos was gift-wrapped the No. 3 spot, thanks to Buffett's philanthropy. The oracle, whose net worth has risen $2.7 billion this year, donated some $2.2 billion worth of stock earlier this month as part of his annual gift to the Bill & Melinda Gates Foundation. 

So while Bezos will gladly accept the new status, Buffett, who has gifted billions to numerous charities over the years and a noted admirer of Bezos, isn't crying about it. And maybe one day, Bezos, who began the year at No. 5 on the list, according to Forbes, will join Buffett's Giving Pledge.