Silman Ondrej Dia
I believe one of the strongest takeover defence strategy is the cross-shareholding that Japanse keiretsu companies have put in place. Companies own each others’ shares which prevent unsolicited takeover attempts.
In addition this strategy could be coupled by a poison pill tactic which would consist of issuing stock warrants to dilute the acquirer’s holding to make the takeover more expensive.
I believe both such strategy and tactic would constitute a sound strong defence mechanism in face of a takeover.