It's also traded on the US OTC market (ZFSVF; also ZURVY; these are ADR's, so representing a fraction of the Swiss shares).  What's interesting is that almost all of their investments are American companies:

https://www.otcmarkets.com/filing/html?id=16864047&guid=m05-kKqdzR7fJth

I'm not aware of any rule against donation of foreign stocks.  Same thing as donation of US stocks that mostly own shares in foreign companies, right?