Facebook CEO Mark Zuckerberg and wife Priscilla Chan's philanthropic initiative, The Chan Zuckerberg Initiative's funds would surpass funds at top 10 US charities, according to Recode. Zuckerberg pledged to donate his 99% Facebook shares, which are currently valued at $63 billion. The second most-funded charity is Bill & Melinda Gates Foundation, which had an endowment of $40 billion in 2015.