Hey there, data geeks!<p>I am doing research on the rise of social entrepreneurship and got sidetracked by what a badass Bill Gates is. I found out that his foundation is 4x larger than the next largest private foundation in the US. And if you add up the wealth pledged as a part of The Giving Pledge it is 10x larger than that.<p>I compiled The Giving Pledge data on my own by researching net worths of each pledgee. Planning to put the data on the Wikipedia page shortly.<p>I found the other data from the following sources (see direct links in article):<p>Foundation Center 
The Giving Pledge 
NP Trust 
GBD 
Compare AVAC<p>Happy to answer any questions and would love feedback.