Thanks, this is Richard Hough joining you. Appreciate you joining us for our third quarter 2020 call. Silvercrest's discretionary assets under management, which drove our top line revenue, grew approximately 4% during the quarter to $17.9 billion as of September 30, 2020. The growth in discretionary assets under management was supported by markets increasing our asset values by $700 million, along with $200 million in new client accounts. These increases were offset by outflows of $200 million, primarily for tax payments as a result of delayed tax deadlines due to the coronavirus crisis. The firm's total assets under management during the quarter increased approximately 3% to end the quarter with $24.4 billion in total assets under management.
Due to this year's market recovery, continued organic growth and our accretive acquisition in the second half of 2019, the firm's revenue, our adjusted net income, adjusted EBITDA and adjusted EBITDA margins for the 9 months ended September 30, 2020, have each grown year-over-year. For the 9 months ended September 30m 2020, adjusted diluted earnings per share increased approximately 13% year-over-year.
Silvercrest's Outsourced Chief Investment Officer, OCIO, initiative, which we began marketing heavily a year ago, contributed meaningfully to new business development in the third quarter and is poised to cross important AUM thresholds to be considered for new OCIO mandates. We continue to be proud of our progress in that business.
Silvercrest institutional asset management pipeline is rebuilding along with new initiatives, and we expect the institutional business to improve and contribute new AUM to the firm. Regardless of the environment, Silvercrest will continue to opportunistically seek to effectively deploy capital to enhance and complement our organic growth. Silvercrest has successfully made investments to organically grow the business and will continue to make those investments with its cash flow and reserves. We've hired new high net worth portfolio management professionals in New York and will continue to add new talent, both to maintain a high level of client service and to grow the business.
On November 4, 2020, the Company's Board of Directors declared a quarterly dividend of $0.16 per share of Class A common stock. The dividend will be paid on or about December 18, 2020, to shareholders of record as of close of business on December 11.
With that, I'll turn it over to Scott to review our financials, and then we'll open the line for questions. Thanks.