There's always a margin in the company being taken over, to cover the possibility that the deal does not go ahead. The only time there's a premium is when the market is expecting another takeover bid or increased offer, which clearly isn't the case here.
If the deal goes ahead, the trader will gain that margin. That's to compensate them for the times when it doesn't and they suffer a much larger loss - something which has also happened many times... FMS probably being the most recent.
IGR Price at posting:
45.0¢ Sentiment: None Disclosure: Held