IB - Market On Close, when will you not get the exact fill?

V

Viperace

Hi all,

Long time lurker and first time poster here. I have searched thru the forums and seems like most are getting their MOC fills nicely. I cannot figure out why mine is not.

Here's 28-Apr-2014 MOC fill

Code: 
 Action	IB Fill	Yahoo/IQFeed Close   Size
Short	SPY	186.91	186.88	123
Long	XLK	36.1	36.09	123
Long	VXX	40.93	40.95	123
Long	EWU	21.12	21.10	95
Short	EWG	31.13	31.15	65
Long	EZU	42.46	42.46	47
Short	EWA	26.68	26.67	100

Some fills are better and some are bad. Overall, they are bad and EWU and EWG killed me most. The only exact fill I get is EZU.
These are liquid ETF and I do not expect a wide bid/ask on a normal market day..

My question, is the failure to obtain an exact MOC fill is due to my odd or partial lot ?
Did you always get exact IB MOC everytime? If so, what is the lot size you used?

EDIT:
Further info, all these are trade are stamped at 03:59:30 (my timezone is GMT +8 ), why is it traded 30secs before market close at 4:00:00 is beyond me. IB Simulated Trading account
 
Hi,

in my case its very rare that I dont get filled at the official closing price. I use odd lot orders all the time, so this should not be an issue. Time I get filled is always between 4:00:00 and 4:00:01. But this is for Nasdaq stocks only! NYSE is another story and the same might be true for ETF's like SPY, or DIA. IB Sim accounts don't support real MOC, or OPG orders.
 
Thanks for the info. Apparently you are right, in demo account TWS does not route to the correct exchange hence causing these odd fills and time.
 
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