The Trump Organization is a group of about 500 business entities of which Donald Trump is the sole or principal owner. Around 250 of these entities use the Trump name. The organization was founded in 1923 by Donald Trump's paternal grandmother, Elizabeth Christ Trump, and his father, Fred Trump, as E. Trump & Son. Donald Trump began leading it in 1971, renamed it around 1973, and handed off its leadership to his children in 2017.