how do you buy s&p
The S&P 500Â® index option contract has an underlying value that is equal to the full value of the level of the S&P 500 index. The S&P 500Â® index option trades under the symbol of SPX and has a contract multiplier of $100.ow to Trade S&P 500 Index Options. If you are bullish on the S&P 500, you can profit from a rise in its value by buying S&P 500Â® (SPX) call options. On the other hand, if you believe that the S&P 500 index is poised to fall, then SPX put options should be purchased instead.