Citadel CEO Ken Griffin lends rare U.S. Constitution to Philadelphia center with $15M donation.

Citadel CEO Ken Griffin is loaning his rare first-edition copy of the U.S. Constitution and a copy of the Bill of Rights to the National Constitution Center in Philadelphia, along with a $15 million donation, the largest in the center's history. Griffin believes the U.S. Constitution has been key to America's success. The donation will fund a new gallery that tells the story of America's founding, marking the most significant update to the center since its opening in 2003.