what is this ?

S

silver217

At Interactive Brokers I placed a limit combination order:

SELL 6x SPXPM june 1500
BUY 6x SPXPM june 1510

for a limit price of 0.45 (credit)

At setting up the combination order I have 2 choices: SMART and CBOE2
I choose CBOE2, there is only one place where these options are available
so there is nothing smart. right ?

Before I transmit the order, the Bid size is 138, Bid = 0.30, and
the Ask size is 186, Ask = 0.70

After I placed the order the Ask size becomes my size of 6 and also my
limit is now the new Ask. No fill yet.

Can sombody explain this to me ?
 
if i understand your sit correctly, this is what happens in illiquid options - the b/a "magically" changes after you put in your order. there is no way around this except to stick to liquid options.
 
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