Does anybody know if you change an existing order in size but not price do you retain your position in the que?
If memory serves me correctly you can reduce size and hold position but increases will knock you to the back of the bus. You should contact GCC to confirm 312-456-2391
Do you actually think The CME wastes their time on a board like this? They do answer e mail @ CME! http://www.cmegroup.com/tools-information/contacts-list.html
The above answer is correct you can reduce your size and maintain your position. If you increase the size on your order you go to the back of the line.