As of various 2010 dates, there were, as you show, four institutional shareholders:
U.S. Global Investors -- 3.37m shares
Caldwell Investment Management Ltd -- 1.38m shares
Zurcher Kantonalbank (Investment Management) -- 500K shares
Etienne, Odier, Pythoud & Cie SA -- 350K shares
(pretty slender, eh?)
Best, O.F.