The network of an investor is incredibly important both for raising additional capital, as well as strategic expertise in a given area. Tech Coast Angels, which claims to be the largest angel investment organization in the US, features over 300 members covering all of Southern California and led all angel groups in terms of network centrality – a measure of network strength. Palisades Ventures was the most prolific follow-on VC for Tech Coast Angels, as the LA-based VC shares multiple portfolio companies with Tech Coast Angels.

Heading north, Sand Hill Angels ranked second in network centrality among all angel groups. The 100+ member group, which ranked in the top 3 most active angel groups in the Q1 2014 Halo Report, most often sees follow-on investments from VCs such as New Venture Partners, DFJ Gotham Ventures, and ECentury Capital. Their recent investments include participation in restaurant tech company NoWait’s $10M Series B, as well as Storefront’s $7.3M Series A. The full rankings below.