REQUEST FOR COMMENT ON DRAFT INTERPRETIVE GUIDANCE ON APPLICATION OF MSRB RULES TO CERTAIN PREARRANGED TRADING IN CONNECTION WITH PRIMARY OFFERINGS

1. Bond Dealers of America: Letter from Mike Nicholas, Chief Executive Officer, dated March 5, 2019

2. Regional Brokers, Inc.: Letter from H. Deane Armstrong, CCO, and Joseph A. Hemphill, CEO, dated March 7, 2019

3. Securities Industry and Financial Markets Association: Letter from Leslie M. Norwood, Managing Director and Associate General Counsel, dated March 6, 2019