ESG analysis has garnered greater acceptance and more "mainstreaming" as academic and practitioner studies have demonstrated added value on a variety of metrics. Our firm has seen this growth internally as well. After doubling our ESG integrated AUM in the prior two years, this year we signficantly expanded our ESG integration across Equity and Fixed Income Strategies. For example, our Large Cap Equity Strategy incorporates the ESG factor analysis and the majority of holdings overlap with our advocacy efforts for our designated Social ESG Strategies. Our Limited Volatility Fixed Income Strategy (a high credit, U.S. government and agency product) allocates to government-backed, AAA-rated securities which include Small Business Loans (SBAs) that often assist low income or minority owned businesses. These Strategies combined with our Social ESG Strategies represent the majority of our AUM. All Strategies incorporate Governance and we see an increase in the materiality and use of E & S factors as well.
We utilize proprietary quantitative financial and ESG models coupled with rigorous fundamental analysis to determine relative valuations for companies in our universe. Our ESG modeling is used as the basis for our Equity and Corporate Bond ESG integrated Strategies.
Our Responsible Investment policy includes details on our positive factors, negative screening (where applicable), processes for integrating ESG analysis and active ownership efforts. Our firm's Responsible Investment Policy is on our website and includes our overall approach to investing that incorporates a quantitative and fundamental analysis of ESG issues and our view that this is becoming more material and more mainstream. Our proxy guidelines that encompass the majority of equity AUM are on our website as is our engagement policy.
One variation of note is our Catholic Equity and Fixed Income ESG Strategies. These Strategies integrate ESG factors as described above and also adhere to the United State Conference of Catholic Bishops (USCCB) guidelines.