As you know, finding investors for your startup is not easy, and many say here in Switzerland it is even more difficult due the the strong risk averse culture. Business Angles are just as elusive.
Thankfully, Sébastien Flury has put together two great posts on What is a Business Angel and where to find them (Part I), and a good list of business angels associations in Switzerland.
For the full details, check out the links above, but here’s a shortlist:
Business Angels Suisse
Go Beyond
StartAngels Network
Mountain Super Angels
b-to-v
Club valaisan des Business Angels
A3 Angels
Investiere
c-crowd
Additionally, Michael Wolfe (who spoke at Failcon Zurich last year), has several posts with some good insights on Quora about Angel Investors.