Art Raschbaum
Analyst · FBR
Thank you, Noah. Good morning, and thanks for joining us for our third quarter 2012 earnings call. I'm pleased to report that Maiden's performance during the third quarter continues to demonstrate the ongoing success of our unique strategy, with a quarter-to-quarter increase in book value per share of over 6%; an improvement in the run rate of our investment income; continued profitable underwriting results; a 6% increase in net premiums written compared to the third quarter of 2011; and strong operating earnings per share of $0.27.
Year-to-date book value per share has increased 14% to $12.14 due to a combination of earnings, investing in capital management activities and the increased market value of our investment portfolio. Importantly, as John will discuss in a moment, total equity is now over $1 billion, up 34% from year-end 2011.
Maiden's business model is predicated, as you may know, on a highly differentiated strategy of writing a lower layer, traditionally less volatile, non-catastrophe reinsurance programs coupled with a high degree of operating efficiency, while serving the needs of small to midsized regional and specialty insurers in the U.S. and internationally.
The business philosophy has allowed Maiden to produce more stable operating results and reinsures with more volatility-oriented portfolios, while at the same building a dynamic profitable growing business. Across Maiden, we continue to enjoy continued organic growth, reflecting both new client relationships, as well as growth from our existing clients. Many of our clients today are experiencing favorable pricing trends, which we believe could ultimately benefit our reinsurance experience.
Net premiums written for the first 9 months of 2012 were $1.5 billion, and that's an increase of 11% over the third quarter of 2011. The Diversified Reinsurance segment, which includes our U.S. subsidiary Maiden Re, and our international business development activity, Maiden International Insurance Services, as well as our Bermuda underwriting activities, excluding the AmTrust and ACAC Quota Shares, has written 2.8% more of bulk premium volume in the third quarter 2012, as compared to the same quarter in 2011.
We've seen growth from existing clients moderate a bit this year, with new account activity making up most of the increase. Additionally, in select instances, we've lowered our participation and, in some cases, non-renewed a couple of highly competitive larger accounts as we continue our focus to strengthen underwriting performance. However, the client retention rate for U.S. treaty business remained at 90% for the third quarter.
Net premiums written for the -- our AmTrust Quota Share Reinsurance segment are up 7.4% in the third quarter and 17.7% year-to-date. The most significant contributors to the premium increases are from worker's compensation, warranty and special risk, including the European Hospital Liability business. These segments are benefiting from favorable pricing trends as well as strong business development.
Our strategic quota share with ACAC, which is the former GMAC Insurance, personal auto insurance company, has seen net premiums written increase 13.9% and 16.4% in the third quarter and on a year-to-date basis, respectively, compared to the same periods in 2011. ACAC continues its growth by targeting preferred auto clients and carefully expanding its geographic footprint.
Our consolidated combined ratio was 98.2% compared to 97.4% in the third quarter of 2011. And we recognize that this remains above our target of 96% and we continue to adjust the portfolio in an effort to achieve our target. While we do believe that rate improvements for our clients will ultimately translate to improved underwriting ratios for Maiden, it is a bit too early for us to realize the benefit of those improvements.
Our Diversified Reinsurance segment experienced some areas of elevated loss experience, which resulted in a combined ratio 98%. We're taking actions to mitigate some of the inconsistency in result. As an example, while we continue to see higher-than-expected loss costs in our German auto reinsurance portfolio, which is produced by the Maiden International Insurance Services, our loss ratios have at least stabilized, and that reflects the actions that have already been taken. And we continue today to work with our partners to adjust contracts and improve our results. We expect to begin to see the benefit of these changes work their way into the portfolio in the coming quarters.
The combined ratio for the AmTrust Quota Share Reinsurance segment was 97% for the third quarter of 2012, and that's an improvement from the 97.8% combined ratio recorded in the third quarter of 2011. The net reduction was driven by an overall reduction in seeding commission, and that reflects the changing mix between the lower commission -- the lower seeding commission European Hospital Liability program and the balance of the interest portfolio. The ACAC Quota Share segment produced a 96% combined ratio in the third quarter of 2012, which was consistent with the same period in 2011.
Across our business segments, we're all -- we believe that we're very well positioned to continue to properly expand our business and we're very focused on enhancing underwriting performance. In the quarter, we made significant strides as well in strengthening investment earnings, increasing invested assets, strengthening our balance sheet and increasing our financial flexibility.
I'd like to turn the discussion over to John Marshaleck, our Chief Financial Officer, to review these accomplishments and also provide a bit more financial detail on the quarter. John?