candidates gravitate to those who are willing to and able to provide huge sums of money and ken griffin has proven himself willing to do that. >> reporter: griffin is worth an estimated $7 billion, according to "forbes." >> accounts for nearly 10% of the daily trading volume of u.s. equities. >> reporter: with $26 billion in investment capital, citadel, his pet project is one of the largest investment firms in the world. griffin isn't shy about spending his cash. ♪ i need you by me >> reporter: an extravagant wedding reception in 2003, starring disco queen donna summer at the palace of versailles in france according to "fortune" magazine, the same location where kim kardashian and kanye west held part of their lavish multicity wedding. griffin's marriage fell apart about a decade later and the divorce played prominently on