The National Bureau of Economic Research (NBER) has quite a bit of original data from its affiliated scholars available on its website
. Directly related to entrepreneurship include some of the older data from John Haltiwanger and different colleagues related to job flows
and management practices data from Bloom and Van Reenen
. NBER also has a pretty extensive list of links
for other data producers. As best I can tell, there is no way to sign-up for notices of new data posted to this page. If any readers are aware of a way, please let me know.