Dr. Peter Buck made a fortune with the sandwich shop he opened in 1965, which would later become a massive franchise with over 37,000 locations.
When he died last year at the age of 90, Dr. Buck left 50% of Subway ownership to his two sons, but the other 50% is going to charity, according to a new announcement from his estate.
Dr. Buck and his wife are founders of the Peter and Carmen Lucia Buck Foundation (PCLB), which funds various causes, including education, conservation, and medicine.
The gift, estimated to be around $5 billion, marks the latest in hefty philanthropic donations from billionaire entrepreneurs.
Last year, Patagonia founder Yvon Chouinard announced
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