Thanks, one more question; are options of futures are the same American style as stock options? In the money what are the chances of assignment?All options have a multiplier that tells you how many units of the underlying it’s based on. ES multiplier is 50x and $29.50 x 50 = 1475.
Going below $0 is not possible for ES and your screenshot doesn’t say that it’s possible. It simply tells you that the calculations don’t include such scenario.
Prices below $0 may be possible on other, commodity futures.
It does not seem to be any advantage trading options on ES over SPY other than the size of dollars for one contract and commission.
It may not be an advantage over SPY, but ES is subject to SPAN margin, which can be a big advantage if you trade SPX (10x SPY). Say you wanted to leg into a spread that's far OTM (say 2300). For SPX, that'd take 230k unless you have portfolio margin (which you can't get in an IRA). The margin on ES would be a fraction of that, even though you need twice as many contracts. SPY/SPX seem give you more flexibility in the strikes/months available, though.It does not seem to be any advantage trading options on ES over SPY other than the size of dollars for one contract and commission.