[Nords]

Quote:

Originally Posted by Olav23 For example, you think some stock is about to go into the S&P500, and knowing that tons of mutual funds and ETFs will be forced to purchase it, you buy it in advance and wait for all the buying pressure. And as the pressure pushes it up, you sell.

Sure, it's one of the legal versions of frontrunning.

The problem is that not every index fund announces the stocks to be added (or dropped!) sufficiently far in advance for you to beat the arbs. IIRC Russell used to announce their selections months in advance of adding the stock but even their selections jumped a couple percent within microseconds of the press release.

The reality is that the stocks were probably jumping days before the press release as the news inevitably leaked. Your trick would be to join the club that gets the early news, or to make educated guesses from their index criteria.