Time in Force Explained: Day, GTC, IOC, FOK
What is time in force? Day, GTC, IOC and FOK decide how long your order stays live and what counts as a fill, plus the auction cutoffs that end it.
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The Sub-Penny Rule and Price Improvement
Rule 612, the sub-penny rule, bans quotes in fractions of a cent above $1.00. Here is why your fill still printed at four decimals, with real tape data.