On November 4, the Commodity Futures Trading Commission (CFTC) approved for publication in the Federal Register a supplemental proposal (the "Supplemental Proposal") to Regulation Automated Trading ("Regulation AT"). The Supplemental Proposal, which amends in part, but does not replace, the CFTC's November 2015 proposal (the "Initial Proposal"), was approved by a two-to-one vote, with Commissioner J. Christopher Giancarlo voting against the proposal.