Kenneth Krause
Executive Vice President, Chief Financial Officer at Rollins
Thank you, Jerry, and good morning, everyone. We are now nine months into 2024, and we've delivered solid financial results. Year to date, we've delivered double-digit improvement across all major P&L metrics year over year and EBITDA margin improvement of 50 basis points despite making significant investments in the business here in Q3. Cash flow continues to be strong with free cash flow growing nearly 12% year to date, enabling a 10% increase to our dividend, which we announced earlier this week.
With this increase, we have raised our regular dividend by approximately 65% since the beginning of 2022 while continuing to meaningfully invest in the growth of our business. This is a reflection of our disciplined and balanced approach to capital allocation, our ongoing commitment to return capital to shareholders and the confidence we have in our future.
Looking closer at the third quarter. Our team executed exceptionally well and delivered Q3 revenue growth of 9% year over year, with organic growth of 7.7%, at the high end of the 7% to 8% range we've discussed this year. We delivered good growth across each of our service offerings. In the third quarter, residential revenues increased 6.4%, commercial pest control rose 9.4% and termite and ancillary increased by 14.5%. Organic growth was also healthy across the portfolio with growth of 4.9% in residential, 81.% in commercial and 13.7% in the termite and ancillary area of our business.
Turning to profitability. Our gross margins were 54%, up 20 basis points versus last year. We continue to be positive on the price cost equation. Pressures from incremental people investments were offset by leverage in materials and supplies as well as fleet. Quarterly adjusted SG&A costs as a percentage of revenue increased by 100 basis points versus last year.
This was primarily driven by incremental investments in people to support our growth initiatives and the uptick in advertising spend that we expected and previously discussed during our Q2 earnings call. Third quarter GAAP operating income was $192 million, up 8.3% year over year. Operating margins were 20.9%, down 20 basis points year over year. Third quarter adjusted EBITDA was $219 million, up over 5% and representing a 24% margin.
Margins were down 80 basis points versus last year, and adjusted incremental EBITDA margins were 15.1% in the quarter, reflecting incremental investments in people and growth programs during the quarter. The effective tax rate was approximately 26.1% in the quarter, and we continue to expect an ETR of approximately 26% for the year, which implies a rate that is just over 27% for the fourth quarter. Quarterly GAAP net income was $137 million or $0.28 per share, increasing 7.7% from $0.26 per share in the same period a year ago. Accounting for certain non-GAAP adjustments, adjusted net income for the quarter was $140 million or $0.29 per share, increasing nearly 4% from the same period a year ago despite a higher level of interest costs and the investments we are making and growthoriented initiatives.
We remain on track to deliver healthy profitability for the full year driven by solid growth and an improving margin profile. We continue to focus on driving further improvements while investing in our business and capturing growth in our very attractive end markets.
Turning to cash flow and the balance sheet. Quarterly cash flow was $139 million, up a very healthy 16% versus last year. Free cash flow conversion was 102% for the quarter and 110% year to date. We made acquisitions totaling $24 million, and we paid $73 million in dividends in the quarter. Year to date, we have made acquisitions of $106 million and returned $218 million to shareholders through our dividend. Additionally, we had just announced a 10% increase to our dividend earlier this week. This represents over two decades of consecutive increases in annual dividend payments. Debt to EBITDA leverage is well below one times on a gross and net level. Our balance sheet is healthy, and we are well positioned and committed to continue to maintain our balanced approach to capital allocation.
In closing, we continue to focus on investing for growth while executing on our continuous improvement and modernization initiatives. We are starting the last quarter of the year with healthy organic demand, and we remain committed to investing in our people and providing our customers with the best customer experience.
With that, I'll turn the call back over to Jerry.