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Dott, I suspect you aren't too familiar with the m&a market? That's exactly what they do. It's called an investment bank and they absolutely canvass the big holders re their interest in selling and at what point they will depart their shares. The ib doesn't say who they represent so it doesn't always let the big s/h know it's a potential takeover... But often the big sh doesn't care. They are in it to make profit and they actually like getting tapped and setting their sell price, usually.

read up a little, you'll be surprised what happens late at night when a surprise takeover is potentially unfolding. I assure you it's a whole lot more believable than de beers (Or anyone else) buying half a million shares on the asx