I expect much of the data is out there, because the majority of billionaires either want to give publicly, or they need to disclose when they change their shareholdings in their main source of wealth (in the case of the typical company founder) due to regulations, and donating to charity is seen as a good excuse to do this.
It may be rather difficult to gather though, as I don’t expect there to be a nice centralised source.
I expect much of the data is out there, because the majority of billionaires either want to give publicly, or they need to disclose when they change their shareholdings in their main source of wealth (in the case of the typical company founder) due to regulations, and donating to charity is seen as a good excuse to do this.
It may be rather difficult to gather though, as I don’t expect there to be a nice centralised source.
I guess the harder the data is to gather the more valuable the resource would be! If it is actually something people are interested in that is...