While the nine rating services registered as Nationally Recognized Statistical Rating Organizations were largely compliant with Securities and Exchange Commission regulations and recommendations, the agency found some significant issues with the ABS rating process. In a review covering the government’s 2012 fiscal year ending in September, the SEC said one of the top three firms appeared to change its method for calculating a key financial ratio in rating certain asset-backed securitizations, but failed for several months to publicly disclose the change and its effects on the ratings. The agency includes non-mortgage ABS, commercial MBS and non-agency MBS in a single category of asset-backed securitizations. “Further, it appears the NRSRO did not consistently apply...