Cox said that during the buildup of the credit crisis, when the credit rating agencies were still unregulated, they gave top credit ratings to financial instruments which packaged risky loans and spread the negative impacts of the credit crisis more broadly throughout the markets. Following the first-time SEC registration of the credit rating agencies in September 2007 under newly enacted legislative authority, he ordered a 10-month examination of the three major rating agencies that uncovered significant weaknesses in their ratings practices for mortgage-backed securities and that called into question the impartiality of their ratings. The results were reported to Congress in July 2008. The SEC immediately commenced a rulemaking which concluded on December 3, 2008 with approval of a series of measures to regulate the conflicts of interests, disclosures, internal policies, and business practices of credit rating agencies. The regulations were intended to ensure that firms provide more meaningful ratings and greater disclosure to investors concerning collateralized debt obligations and residential mortgage-backed securities.