Alan Schnitzer2:10
Thank you, Abby. Good morning, everyone, and thank you for joining us today. We're pleased to report an excellent second quarter and another in a sustained run of successful quarters with very strong underwriting performance across all three segments and a terrific result from our investment portfolio. Our results continue to reflect steady progress on the innovation front as many of the initiatives we've shared bear fruit. Everything from product enhancements to the impact of AI on straight through claims processing. There's more of that to come as we continue to invest with discipline and focus on the initiatives that matter most.
For the quarter, we earn core income of $2.2 billion or $104 per diluted share, generating core return on equity of 24.9%. Over the trailing four quarters, we generated a core return on equity of 24.2%. Underwriting income of $1.7 billion pre-tax was driven by very strong levels of underlying underwriting income and favorable prior year development. Reported and underlying profitability in the quarter were excellent in all three segments.
The combined ratio improved to 83.6% and the underlying combined ratio improved to 84.1% driven by a lower underlying loss ratio. Coming to investments, our high quality investment portfolio continue to perform well. After tax net investment income increased by 14% to $883 million, driven by strong and reliable returns from our growing fixed income portfolio and a strong result from the non-fixed income portfolio. Our underwriting and investment results together with our strong balance sheet enabled us to return more than $1.5 billion of excess capital to shareholders during the quarter, including $1.3 billion of share repurchases.
Even after that return of capital and having made important investments in the business, adjusted book value per share was 16% higher than a year ago. Turning to the top line, we generated net written premiums of $11.5 billion in the quarter. In business insurance, we grew net written premiums to $6 billion, 5% higher than the prior year quarter, adjusting for the sale of our Canadian business. We grew in every line other than property, but we continued to be very disciplined about writing national property. Property premiums were higher in both our small commercial and our middle market businesses. Renewal premium change in the segment was 4.8%. With stable renewal premium change of 6.1% in our core middle market business and sequentially higher renewal premium change of 9.4% in our small commercial select business. By product, RPC was higher or stable in every line other than property. Excluding the property line, RPC was 7.8% and about flat sequentially. Retention remains very strong at 86% reflecting deliberate execution on our part and a generally high level of stability in the market. New business was a record $85 million of 8% over the prior year quarter. As I've shared before, pricing, retention, and returns need to be evaluated together. The optimization of that combination together with new business create shareholder value. Looking at them in concert, these results reflect the exceptional execution of a sound strategy by our experienced field organization.
In bond and specialty insurance, we grew net premiums by 14% to a record $1.22 billion. In our high quality management liability business, renewal premium change remained steady while retention improved to an excellent 88%. New business was up 8% over the prior year quarter. In our leading surety business, we grew net written premiums by 40%. Reflecting our success with large accounts and continued strong production across the portfolio. In personal insurance, we grew net written premiums. We generated net written premiums of $4.3 billion with solid retention of both auto and homeowners and higher new business and homeowners. You'll hear more shortly from Greg, Jeff, and Michael about our segment results.
Before I turn the call over to Dan, I'd like to take a minute to step back from the quarter and talk about what's behind the sustained period of strong results we've delivered. In short, it's the earnings engine we've built. There are four components that comprise core income. Underlying underwriting income, net investment income, catastrophe losses, and prior year development. All four have contributed to our success. We've shared before the significant increase in underlying underwriting income over the past decade. You can see that on slide 19 of the webcast presentation. That success is in large measure the result of investments we've made to our focused innovation strategy to strengthen and extend our broad portfolio of competitive advantages. Leveraging those advantages, we've driven underlying underwriting income higher by growing the top line while at the same time improving underlying margins. You can see the strength of the result in the contribution of underlying underwriting income to return on equity. Looking ahead, we expect to continue generating strong premium levels at attractive underlying margins with the next chapter of our investment work, Innovation 2.0, and our growing scale is added tailwinds. That's why you've heard us describe our strong level of underlying underwriting income as durable.
Net investment income is also a growing and reliable contributor to our bottom line. Strong underwriting cash flows and predictable returns from our fixed income portfolio complemented by positive returns from our alternative investments have contributed to an investment portfolio that is now more than $100 billion. Net investment income has been a consistently strong contributor to ROE and new money rates in the fixed income portfolio continue to outpace the embedded yield. As a reminder, about 95% of our investment portfolio is invested in fixed income, of which 99% is investment grade. Together, our underlying underwriting income and net investment income have grown into a formidable earnings base, substantial enough to absorb significant catastrophe losses, and still produce leading returns.
In each of the last two years, we've produced among our highest levels of returns in spite of record levels of catastrophe losses. And our resilience to catastrophes is about more than the size of that earnings base. As we've said before, our share of the industry's property catastrophe losses over the past decade has been meaningfully lower than our corresponding market share. A direct result of our discipline risk selection, pricing, and exposure management. All powered by leading data and analytics. Those are the same capabilities that position us to handle the prospect of continued weather volatility. That brings me to the balance sheet and prior year reserve development. We don't plan for PYD. When we set our reserves, we're deliberate about taking uncertainties into account. So, we're never counting on favorable development to materialize. Yet, it has. We've recognized net favorable prior year reserve development in 19 of the last 20 years totaling $15 billion pre-tax which speaks to the discipline in our process. We're confident that our balance sheet is as strong today as ever.
The earnings and cash flow this engine generates go well beyond what we can effectively put to work to run and grow the business. And that gives us valuable choices on how to deploy the excess capital. Our first priority is always to reinvest organically or inorganically. But we can earn attractive returns. When we generate capital beyond those opportunities, we don't think of it as ours to keep. As responsible stewards, we return it to our shareholders. We've done that consistently and with discipline. We've raised our dividend every year for more than two decades at a compound annual rate of 8%. And we've returned meaningful capital through share purchases. Since we started our share repurchase program, we've retired 70% of the shares then outstanding and as a result spread our growing earnings, dividends, and book value across fewer shares, increasing each shareholder stake in the earnings power we've built. Just by virtue of our share repurchase program, a shareholders percentage ownership of Travelers has increased 9% since the beginning of 2025. The percentage ownership of a shareholder who owned Traveler stock when we began our share repurchase program in 2006 has more than tripled.
As an aside, by returning excess capital to our investors, we give them the ability to allocate their investment dollars as they see fit, including by investing in companies with different growth profiles or capital needs, thereby contributing to the efficiency of the capital markets. The efficient allocation of capital contributes to a stronger economy. To wrap it up, that's the earnings engine tuned to continue delivering industry-leading returns at industry low volatility. And this engine funds its own improvement. The earnings and cash flow we're generating are what allow us to invest well more than a billion and a half dollars a year, including in focus technology initiatives such as AI to strengthen the very advantages behind these results. It's a virtuous cycle and one that scale only makes more powerful. Ultimately, all of this is what allows us to deliver on the promise we make to our customers, serve our 30,000 colleagues and the communities that count on us, and support the distribution partners who represent us. Operating from this position of considerable strength, we remain highly confident in the outlook for Travelers. And with that, I'm pleased to turn the call over to Dan.