Quote from day7793:
I have been practicing the given strategy all day long. I have been hitting mid price on wide SPX bid and ask and gettinng filled. I had a 30 postion put spread. It took me one hour to clean it up. I got what I wanted, saved $600 on proper fills.
Now you come here, a non trader in SPX and starts posting that I am misinforming people? What basis do you have to assert that claim?
Of course you get filled when you take the middle between b/a, everybody does, that's no secret. All markets work that way, why would SPX be different?
Your misinformation lies in that you claim the MM has to take your bid/offer away because otherwise he is obliged to take all, even very large orders beyond your tradesize
at you price. That is what you claimed and that is what you suggest in the title of this thread.
It is pure nonsense and may feed your sense of grandeur, but it has nothing to do with you, it is just how the market works. It is not even certain that the MM is the other party in your trade.
They are not obliged to trade at any price, except the once they post themselves. Their only obligation is that, unlike other traders, they
have to post a bid and an ask, and they wisely put it at equidistant positions from the middle, 'fair' price.
You are right that because the SPX has only a single electronic platform there is not much competition price-wise, and most of the business is done in the pit, thus the unreasonably large spreads. Therefore, your advice not to trade SPX unless you have to is a sound one.
May one ask why
you have to trade the SPX, against your own advise?
Ursa..