D. Armstrong
Analyst · SunTrust Robinson Humphrey
Thank you, Chris, and good morning, everyone. I'm very proud of our second quarter results, highlighted by gross written premium growth of approximately 56% year-over-year, a combined ratio of 69%, an adjusted combined ratio of 64% and an adjusted return on equity of 21%. In addition, our pretax income grew in excess of 46%, excluding the impact of expenses associated with our IPO, tax restructuring, stock-based compensation and the retirement of debt. We believe these results reflect the continued execution of our strategy and the benefits of scale as we grow the company.
Our strong performance in the second quarter was driven by balanced gross written premium growth across our product portfolio. Our earthquake products grew 57% and our non-earthquake products, highlighted by our Commercial All Risk offering were 55% compared to the second quarter of last year.
At the end of the first quarter, we became an AM Best financial size category 8 insurance company, which has led to additional distribution sources and increased submission activity for our Commercial All Risk products. This expanded distribution, as well as an improving pricing environment, led to growth in our commercial lines of 114% compared to the second quarter of last year. Furthermore, our personal lines products grew 42% due in part to the rollout of national carrier partnerships. While we expect continued gross written premium growth from our current offerings, we remain focused on developing innovative new products that address underserved markets. To that end, our recently launched Inland Marine and Assumed Reinsurance divisions both generated written premium during the second quarter.
Turning to the market, we believe the distinct value that we offer to insurers and producers is best demonstrated by our strong premium retention rates. Average monthly premium retention across all lines of business was 88% compared to 84% during the second quarter of 2018. Our commercial lines products generate an average written premium rate increase of 5% during the second quarter and demonstrated overall average premium retention of 86%. Our personal lines products also exhibited continuing strong retention, highlighted by our Residential Earthquake and Hawaiian Hurricane products, which both achieved average premium retention above 93%. Thoughtfully managing our risk exposure and risk transfer strategy, especially as we experience sustained growth, remains a critical feature of our business. At June 1, we successfully renewed $470 million and purchased an incremental $200 million of reinsurance limit, expanding our excess of loss program up to $1.05 billion of total coverage. This added limit continues throughout Palomar to maintain protection beyond the 1-in-250-year peaks on probable maximum loss, which we refer to as PML. And it significantly exceeds stimulator losses from any recorded historical event.
To provide some perspective, as of June 30, 2019, a theoretical earthquake equivalent to the 1994 Northridge or the 1906 San Francisco earthquake, the 2 most significant historical events relative to our portfolio, would generate a gross loss of approximately $715 million or $634 million, respectively. Our per event retention for earthquake or wind events remains $5 million, or approximately 2.5% of our surplus as of June 30, 2019. In addition to the renewal of our core excess of loss program, we completed the inaugural placement of our Specialty Homeowners Facility, which I will refer to as the SHF, to provide quota share and excess of loss reinsurance specifically for our Specialty Homeowners business in Texas, Mississippi and Alabama. The SHF also includes coverage for states that have been identified as expansion opportunities and is illustrative of our strategy of generating a well-balanced combination of fee and underwriting income. Furthermore, the SHF preserves our ability to manage the attritional loss component inherent in writing homeowners' insurance. The June reinsurance renewal experienced a bit of price tagging across the property record. That said, we are very pleased with our non-loss affected layers of reinsurance, renewed flat to modestly up on an exposure-adjusted basis. Our single loss impacted layer of $10 million attached in excess of $5 million for wind-only coverage, did experience a 15% exposure adjusted increase. We believe these results are a testament to the unique attributes of our program and the consistent historical results we have generated for our reinsurance partners.
Our panel now consists of 80-plus reinsurers who are either rated A- or better by AM Best in post collateral. No single reinsurer constitutes more than 5.5% of the excess of loss limit. The June 1 renewal is emblematic of Palomar's strategy of limiting our exposure to major catastrophes, reducing volatility in earnings and protecting our balance sheet to capitalize on post event market demand and dislocation. Our thoughtful approach to reinsurance not only provides loss protection but also superior visibility into our earnings.
I would now like a take a few minutes to touch upon the recent earthquakes in Southern California this past July. First off, our thoughts are with all those impacted by the July 4 and 5 events, which obviously were outside the second quarter. For those not familiar, the July 4 and 5 earthquakes were the largest Southern California has experienced in over 20 years and occurred within approximately 7 miles of each other. But the magnitude of these events served as a reminder of the potential destruction from earthquakes. Due to the proximity in both location and time, as well as the definition of covered events in our reinsurance program, we will discuss these earthquakes as a single event that we are calling the Ridgecrest Earthquake. I'm very proud of our teams who immediately responded to support our policyholders affected by the events, making contact with those most likely impacted to ensure safety and to address their immediate needs.
We previously issued press releases disclosing our exposure in the impacted areas, summarized by the following: 14 Residential Earthquake policies within a 30-mile radius of the epicenter; 14 total Residential Earthquake policies within a 45-mile radius of the epicenter; no Commercial Earthquake policies within a 45-mile radius of the epicenter. Fortunately, we have received a limited number of claims to date, and we do not expect meaningful losses from the event. Historically, major catastrophe events typically lead to an increase in new business for our earthquake products, given that earthquake insurance is a voluntary purchase. This dynamic was certainly the case following the Ridgecrest Earthquake. New business generated following the earthquake was stronger than historical experience from events like Hurricanes Harvey, Irma, and Maria, the next close to the earthquake and California wildfires. As an example, July 2019 new business from our value select Residential Earthquake products was approximately double that of the trailing 12-month new business average as of June 30, 2019. As we look ahead to the second half of the year, we remain focused on profitable growth.
With that, I would like to turn the call over the Chris for a more detailed review of our financial results.