WASHINGTON — The Municipal Securities Rulemaking Board would for the first time require broker-dealers to disclose to state and local governments that they are not fiduciaries and would prohibit underwriters from telling issuers not to hire financial advisors, under revised rule changes it filed Thursday.

The amendments to the proposed interpretive guidance for underwriters for its G-17 fair-dealing rule, which the board filed with the Securities and Exchange Commission, come after market participants urged the SEC to reject or delay the initial changes the board proposed in August.

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