WASHINGTON — Three hours after Standard & Poor’s announced that it had downgraded Assured Guaranty Ltd.’s two insurer platforms to AA-plus from AAA, 84 material-event notices had been filed with the Municipal Securities Rulemaking Board’s online EMMA system disclosing 181 bond issues affected by the rating downgrades.

However, virtually all of the notices were filed by Digital Assurance Corp. on behalf of issuers that subscribe to its disclosure services, with one exception. Sacramento County was the only issuer to file material event notices during the three hours.

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