Tricia Griffith
President and Chief Executive Officer at Progressive
Good morning, and thank you for joining us today. At the end of the second quarter, we were in a difficult place. Rising loss cost, adverse development and catastrophic weather events meant we were facing a significant uphill battle to deliver on our calendar year 96 combined ratio target, while facing a very uncertain future. We made difficult decisions to steer the business through this challenging time. Despite the headwinds, I believed in our strategy and the leaders who are in charge of delivering that strategy. While we knew it wouldn't be easy, we knew that if we execute it properly, we come out better on the other side.
While there is still much uncertainty in our future and more work to do, the results in the third quarter suggest our strategy is working. Before discussing what did happen in the third quarter, let's first discuss what did not happen. First, unlike the first half of the year, the third quarter saw modest company-wide reserve development of only 0.2 points unfavorable across all lines. As we discussed in our presentation during our last call, our reserving group adjusted reserves in the first half tracks many things, including higher severity caused by steepening trends in our fixing vehicle coverages, and higher attorney representation rates in Florida precipitated by House Bill 837.
In contrast to the first half, in the third quarter, we saw some flattening in the loss cost trends for fixing and replacing vehicles. We also now believe we have adequately reserved for the higher severity related to pre-House Bill 837 lawsuits. Second, in the third quarter, catastrophe losses were 1.3 points lower in total after reinsurance than the first half of the year. We do not write homeowners in Hawaii. So our exposure to the heart-wrenching Maui fires was limited. After reinsurance, our property catastrophe losses in the third quarter were 28 points lower than the first six months of the year. And while Hurricane Idalia was devastating to the people in this path of destruction, the density of homes and autos we insured in that path was relatively low.
What did happen in the third quarter is that our rate and non-rate actions had a positive effect on premium and profitability. Including the four points of rate we took in the third quarter, we have now taken approximately 16 points in personal auto year-to-date with more of that rate earning in every day. Both Commercial Lines and homeowners also took rate as we looked to address loss trends in those lines. We continue to adjust and refine non-rate actions across the portfolio to help the business we are writing to meet our profitability targets. In addition to improved underwriting results, our net income is also benefiting from the higher interest rate environment.
For the first nine months, our investment portfolio yield is 90 basis points higher, and recurring investment income is 59% higher than the same period last year. With sustained higher interest rates, we expect yields to continue to increase as securities with lower interest rates mature and those funds are reinvested at higher rates. Many of the actions we took and continue to take to address profitability have an adverse impact on unit growth. New apps in personal auto were down 20% in the third quarter compared to the prior year and contributed to a decrease in PIF compared to the end of the second quarter.
This is a reflection of our self-imposed pullback in media spend as we seek to manage our combined ratio through the acquisition expense ratio and find the right balance in cohort pricing, which we talked about at length at our last quarterly call. We continue to assess our marketing spend. And as always, we endeavor to find the right balance between profitability and new business growth. While new applications shrank year-over-year in personal auto, retention reflected through our PLE measure continues to be robust at 35% in personal auto on a trailing three basis. We believe robust retention, especially in the face of higher rates than a year ago is an indicator that many of our competitors are still tight on underwriting, and we remain competitive in the marketplace.
Despite the headwinds created by our profitability actions, our year-over-year growth was very strong. Through September, company-wide PIFs were up 10% year-over-year. Positive year-over-year PIF growth plus higher rates means our premium growth was spectacular with net written premium up 20% year-to-date or $7.9 billion. To put the first three quarters premium growth into perspective, we've added the premium equivalent to a top eight personal auto insurance carrier, which is a truly amazing statistic. Despite the successes that occurred in quarter three, we are not yet declaring victory. Our calendar year combined ratio currently stands 1.2 points above our 96 target. While loss trends have flattened, they are still elevated.
Macroeconomic indicators suggest inflation is abating, but we are vigilant. Given the geopolitical and macroeconomic environment, our view of the future could change overnight. We continue to refine our plans for the rest of 2023 and 2024 as new information comes in. We have built a business where we can quickly take advantage of the opportunities the market offers us. So I'm confident that as things change, we will react with the goal of delivering the best-in-class results we expect of ourselves.
Finally, as a reminder, and as we've previously announced, beginning this fourth quarter, we will move to reporting results on a Gregorian calendar basis versus our historical approach of a 544 convention. Consequently, for the next year, we will limit historical comparisons on a monthly basis and we will continue such comparisons on a quarterly basis.
Thank you again for joining us, and I will now take your questions.