Notices Regulatory Notice 21-28FINRA Adopts Rule 6439 Governing the Operation of Inter-dealer Quotation Systems and Announces Closure of the OTC Bulletin BoardFriday, August 06, 2021 Regulatory Notice 14-36FINRA Announces Elimination of OTC Bulletin Board Historical Research Reports; Fees for ORF Trade Reporting and DataWednesday, September 17, 2014