Fill-Or-Kill Orders Will No Longer Be Supported On The MIAX Options Exchange Date On Monday, 4/12, FOK orders will be rejected on Cloud 21. On Tuesday, 4/13, FOK orders will be rejected on Clouds 18-20. On Wednesday, 4/14, FOK orders will be rejected on Clouds 1-8. On Thursday, 4/15, FOK orders will be rejected on Clouds 9-17 and 22-24.