Unfriendly corporate take-overs or take-over attempts are regulated by the provisions on take-overs laid down in the Swiss Stock Exchange Law which entered into force on 1 January 1998.
In practice, various attack and defence measures will be implemented from that moment. It is not often that potential take-overs will be able to avoid a public tender offer.
Attack measures
Unfriendly takeover: overview of attack measures (PDF, 50 KB)
Defence measures
Unfriendly takeover: overview of defence measures (PDF, 34 KB)