Hat jemand Informationen zu dieser Aktie?

I have shares in XETRA, could I sell them in SIX SWISS EXCHANGE?  

According to my Broker, you can.

If you won't be able to sell online, write your bank a written confirmation about the trade you intend to do.
 

but don't forget:  you have to pay Swiss Tax if you are going to sell!!  

Rapid Nutrition mit deutlich tieferem Umsatz im Geschäftsjahr 2018/19

https://www.cash.ch/news/top-news/...umsatz-im-geschaeftsjahr-1426005