With the S&P 500 and almost every other major index at critical junctures, loading up on gamma could be a smart move. But what is it? 25 years ago you might’ve gotten away without knowing. But the so called ‘Greeks’ (the risk parameters used in option trading) have outgrown their infant shoes and are no longer regarded as an exotic pastime. In fact, even seasoned speculators have come to terms with them.