WASHINGTON — The Municipal Securities Rulemaking Board late Wednesday submitted to the Securities and Exchange Commission technical changes to a handful of its administrative rules that became effective immediately upon filing.

One of the changes to Rule A-3 on membership would prohibit more than one person from the same firm from serving on the MSRB’s 15-member board. The move comes amid unprecedented consolidation of dealers in the industry, and is meant to ensure the MSRB maintains a diverse board.

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