On February 10th, the Financial Industry Regulatory Authority announced that beginning March 1, 2010, members subject to new FINRA Rule 4521(d) must file FINRA's new Customer Margin Balance Form (covering the February 2010 reporting period). FINRA Rule 4521(d) governs filing requirements for customer margin accounts and became effective on February 8, 2010. The rule replaces Incorporated NYSE Rules 421(2) and 421.40 and applies to all FINRA members that carry customer margin accounts. FINRA Regulatory Notice 10-08.