Ratings company Moody's Corp posted a higher first-quarter profit as corporate bond issuance increased.

Net income attributable to Moody's Corp rose to $155.5 million from $113.4 million a year earlier, and per-share earnings rose to 67 cents from 47 cents on a diluted basis. Revenue rose to $577.1 million from $476.6 million.

Moody's raised its full-year 2011 earnings forecast to a range of $2.22 to $2.32 per share.

(Reporting by Clare Baldwin; Editing by Lisa Von Ahn)