MacKenzie Scott alone accounted for one-third of America’s $19.2 billion in megagifts last year

Despite wanting to keep her gigantic philanthropy quiet, MacKenzie Scott’s giving keeps making a splash. 

Of the $19.2 worth of megagifts made by donors in 2025, Scott’s giving represented one-third, according to data provided to Fortune from Giving USA and the Indiana University Lilly Family School of Philanthropy. Scott, the ex-wife of Amazon founder Jeff Bezos, had her banner philanthropic year in 2025, when she donated about $7 billion, which brought her cumulative giving to $26.2 billion in just five years across thousands of organizations focused on housing, DEI, disaster recovery, and many more causes. 

Other 2025 megadonors included Michael Bloomberg ($4.3 billion), Bill Gates ($3.7 billion), Warren Buffett ($1.34 billion), and Susan and Michael Dell (nearly $1 billion). These megadonors are part of the larger philanthropic engine in the U.S., which totaled a whopping $617.2 billion in 2025, according to a report published by Giving USA and IU’s Lilly Family School of........

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