On May 12th, the SEC provided notice of individually filed proposed changes by BATS Exchange and BATS-Y Exchange to their respective order handling procedures to allow both Non-Displayed Orders and orders subject to price sliding (a function that allows orders that would normally be canceled automatically because of locking or crossing the National Best Bid or Offer ("NBBO") to temporarily adjust to the NBBO and reside in the exchanges' matching engines) that are not executable at their most aggressive price to be executed at one-half minimum price variation less aggressive than that price. The exchanges also propose to modify their rules to make clear that an order subject to "NMS price sliding" can be ranked at the same price as an order displayed on the other side of the book, although temporarily not executable at that price and displayed at one minimum price variation less aggressive than its price. Comments should be submitted on or before June 8, 2011.