The Municipal Securities Rulemaking Board is disputing Standard & Poor’s claims that the board’s plans to display municipal bond ratings on its EMMA website would cause it to lose significant revenue, provide few benefits to ­retail ­investors, and erode its intellectual ­property rights.

In an eight-page comment letter filed with the Securities and Exchange Commission Thursday, the MSRB said ­Standard & Poor’s concerns essentially are ­overblown.

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