Quote from gymratnyc:
What do you guys think about this? This guy received some idea from a money manager and then went on and used it and made $500 million.
http://online.wsj.com/article/SB120036270913390155.html
Actually things like this happen a lot more frequently than ppl think. I am a firm believer that there are really not many "new trading ideas" out there, most strategies are derivatives of some other strategy, etc, etc.
Take a case that I know first hand. An analyst in another group back when I was with an investment bank did something similar. A hedge fund client of the firm came and gave a presentation of his basic strategy, his intention was showing us that we were not cross margining his portfolio properly (and to a large extent, he was right). And maybe 12-15 ppl were in the meeting, relationship mgrs, risk mgrs, quants like us, and a few reps from our trading desk.
So the analyst, after the meeting, started saying that "wait, there is a *better* trade here, and this one would be more profitable than his current basic strategy". he would literally tell anyone that would listen, and eventually a brunch of us convinced him that he should talk to the hedge fund mgr directly. So he did, rang the mgr up, and went for a drink along with the RM. I heard the mgr was quite arrogant, believing that his original trade was better, etc. The analyst (who was only 2-3 yrs out of school!), had some balls, said, "do you mind if I trade using the new strategy?" And mgr literally said "well, if you can make it work, all the power to ya." (the mgr really didn't believe it would).
To make a long story short, the analyst went out and raised a bit of seed money to start trading the "new strategy". And last time I checked, his fund just crossed the 250M mark (yeah, I am an investor, but I didn't believe the trade enough to partner with him, heh). Not crazy amount, but he is beating the previous Mgr's return by a factor of 2, with less exposure overall. I bet the mgr must be kicking himself somewhere.