Mike Wagnes
Senior Vice President, Chief Financial Officer at Allegion
Thanks, John, and good morning, everyone. Thank you for joining today's call. Please go to Slide Number 6. Allegion delivered another strong quarter, with both top- and bottom-line growth as well as improving cash flows. Revenue for the second quarter was $912.5 million, an increase of 18% compared to 2022. Organic growth of 5.6% was driven by price realization along with strong growth in electronics, offsetting lower volumes in mechanical products. Our Access Technologies acquisition contributed approximately 12% to total growth. Adjusted operating margin and adjusted EBITDA margin in the second quarter increased by 130 basis points and 110 basis points, respectively. These increases were attributable to strong operational execution and favorable price and productivity, which more than offset inflation and investments. Excluding our acquisition of Access Technologies, adjusted operating margin was up 270 basis points.
Adjusted earnings per share of $1.76, increased $0.33, or approximately 23%, versus the prior year. Operational performance drove 20% earnings per share growth with additional earnings per share growth coming from acquisitions, offset by the unfavorable impact of anticipated higher interest. Details of our earnings per share performance versus the prior year are in the appendix. Year-to-date available cash flow was $190.1 million, up nearly 125% versus last year. Please go to Slide Number 7.
I will start by reviewing the revenue results for the enterprise here before turning to our respective regions. In Q2, we delivered 5.6% organic growth, driven by price realization across the portfolio. Strong volume growth in electronics was more than offset by volume declines in our mechanical products. Our Access Technologies acquisition served as the primary driver of our 12.5% growth in net acquisitions and divestitures. Currency pressure were minimal in the quarter, bringing total reported growth to 18%. First half organic revenue growth was 10.2% overall, driven by strength in electronics. Americas operating growth was nearly 15% and international was down 3%. Please go to Slide Number 8.
Our Americas segment continued to deliver strong operating results in the second quarter, with revenues of $727.2 million, up 23.8% on a reported basis and up 7.7% organically. During the second quarter, we achieved double-digit price realization. Our electronics growth for the Americas was nearly 40% as we continued to see both improvements in our supply chain and strong demand. Electronic component availability was significantly challenged in the first half of 2022, making the quarter an easier comparison versus the prior year as our supply chains are much healthier now. In the second quarter, we saw soft mechanical volumes as customers adjust to our reduce lead times to our improve supply chain and operational execution. Organic growth was up high-single-digits for both our nonresidential and residential Americas businesses.
As John mentioned earlier, Access Technology has now been part of Allegion for just over a year, and we are pleased with the ongoing integration and results. This business had pro forma revenue growth of approximately 9.5% versus Q2 2022, and contributed over 16% to the Americas reported growth. Our adjusted operating income of $205.9 million increased 32.9% versus the prior year period, while adjusted operating margin and adjusted EBITDA margin for the quarter were up 190 basis points and 180 basis points, respectively. Excluding Access Technologies, our Americas segment drove a 460 basis-point improvement in operating margin versus the prior year. Our team is executing well and we were able to drive price and productivity in excess of inflation and investments to deliver the strong margin expansion. Please go to Slide Number 9.
Our international business had a solid second quarter, with revenues of $185.3 million, flat on a reported basis and down 1% organically. In the quarter, price realization was more than offset by lower volumes, primarily associated with our global portable securities business. As we've discussed previously, this business benefited from a COVID-related demand surge in the first half of last year. We expect this market will normalize and be less of a headwind to our international segment in the second half of this year. Our electronics and software solutions are performing well and continued to be a growth driver for our international segment. In addition, currency was a slight tailwind this quarter and positively impacted reported revenue by 0.6%. International adjusted operating income of $20.9 million increased 2% versus the prior-year period. We saw a significant improvement in adjusted operating margin and adjusted EBITDA margins of 30 basis points and 40 basis points, respectively, when compared to last year. The margin improvement was primarily driven by favorable price and productivity in excess of inflation and investment, reflecting strong execution by the team. Please go to Slide Number 10.
Year-to-date available cash flow came in at $190.1 million, up $105.6 million versus the prior year. This increase is driven by higher earnings and lower cash used for net working capital, primarily offset by higher capital expenditures. Working capital as a percent of revenue increased versus the prior year, partially driven by our Access Technologies business, which was not owned in the first half of last year. Working capital management remains a priority of our company as we efficiently turn earnings to cash. As committed, we deleveraged following the acquisition of Access Technologies, and our net debt-to-adjusted EBITDA is back down to 2.1 times. We repaid $60 million on our revolving credit facility in the second quarter and the remaining $30 million outstanding was repaid in the month of July. This means, we have completed our repayments of short-term borrowings for the acquisition, demonstrating our ability to effectively deploy capital and maintain an investment-grade credit rating.
Our business continues to generate strong cash flow and our balance sheet continues to be in a healthy position.
I will now hand it back over to John for an update on our full-year 2023 outlook.