William "Ted" Grace
Executive Vice President and Chief Financial Officer at United Rentals
Thanks, Matt, and good morning, everyone. As you saw in our third quarter release, our team again delivered strong results that were consistent with our expectations and importantly, keep us on track for another record year. I'll add that we continue to feel very good about our prospects beyond 2023 based on our strategy and the tailwinds we discussed extensively. While it remains a little premature to say too much about next year, given where we sit in our planning cycle, I will say that 2024 is shaping up to be another year of growth. Certainly, more to come there in January with our focus today on our third quarter performance and the balance of the year.
Now, one quick reminder before I jump into the numbers. As usual the figures, I'll be discussing are as-reported except where I call them out as pro forma, which is to say the prior period's adjusted include Ahern's standalone results from the third quarter of last year. So with all that said, let's get into the numbers.
Third quarter rental revenue was a record at over $3.2 billion. That's a year-over-year increase of $492 million or 18%, supported by diverse strength across our end-markets as you heard Matt say. With rental revenue, OER increased by $413 million or 18.5%. An increase in our average fleet size contributed 22.2% to that growth, partially offset by a 2.2% decline in as-reported fleet productivity and assumed fleet inflation of 1.5%. Also within rental, ancillary revenues were higher by $83 million or 19.7%, while re-rent declined $4 million. On a pro forma basis, which as you know is how we look at our results, rental revenue increased by a robust 10.2% with fleet productivity up 1.5%, reflecting a healthy rate environment that continues to be supported by good industry discipline.
Turning to used results. Third quarter proceeds roughly doubled to $366 million, reflecting more normalized volumes as we continue to refresh our fleet. The decline in our third quarter adjusted used margins to 55.2% was largely due to expanded channel mix required to drive higher volumes, the impact of some cleanup actions we took on Ahern fleet and the normalization of supply-demand dynamics. Importantly, we continue to take advantage of a robust used market by driving strong volume growth in our retail sales at attractive pricing. I'll also note that our average fleet age was 51.6 months at the end of the quarter, which is essentially back to pre-pandemic levels.
Moving to EBITDA. Adjusted EBITDA in the quarter was a record $1.85 billion, reflecting an increase of $329 million or 22%. The dollar change includes a $264 million increase from rental within which OER contributed $252 million and ancillary added $19 million, while re-rent declined $7 million year-on-year. Outside of rental, used sales added about $85 million to adjusted EBITDA, while other non-rental lines of businesses contributed another $15 million. While SG&A in the quarter did increase $35 million year-on-year, as a percentage of sales, it declined 180 basis-points to 9.9% of total revenue, reflecting another quarter of very good cost efficiency.
Looking at third quarter profitability. Our adjusted EBITDA margin decreased 80 basis points on an as-reported basis, but increased 20 basis points on a pro forma basis to 49.1%. This translates to as-reported flow through of 46% and pro forma flow-through a better than 50%. Notably, if we excluded the impact of used in the quarter, our core flow through exceeded 53% and was in line with second quarter results. And finally, adjusted EPS increased 27% to a third quarter record of $11.73.
Shifting to capex. Gross rental capex was $1.03 billion versus net rental capex of $664 million. A $257 million decline in net rental capex largely reflects a return to more normalized used sales levels this year. Year-to-date, gross rental capex through the third quarter has totaled almost point $3.1 billion, representing about 90% of our full year capex plan, which is in line with both our expectations and historical year-to-date levels. At this point, it is our sense that the supply chains have largely normalized, which should enable us to return to more typical quarterly cadences going forward and better match the timing of deliveries with seasonal demand.
Turning to return on invested capital and free cash flow. ROIC set a new record at 13.7% on a trailing 12-month basis and remains well above our cost of capital, while free cash flow also remains a good story. The quarter came in at $339 million, translating to a trailing 12-month free cash margin of 12.8%, all while continuing to fund robust growth. Moving to the balance sheet. Our net leverage ratio at the end of the quarter was flat sequentially at 1.8 times, while our liquidity totaled $2.7 billion with no long-term note maturities until 2027. Notably, all of this was after returning $1.05 billion to shareholders year-to-date, including $750 million through share repurchases and $305 million via dividends.
So, let's shift to the guidance we shared last night. We reaffirmed within our ranges for total revenue, EBITDA and free cash flow, reflecting our continued confidence in delivering a record year. Within this, we raised the midpoint of total revenue by $50 million to a range of $14.1 billion to $14.3 billion, reflecting cleanup actions being taken to dispose of some older fleet acquired that comes with no margin benefit. Just to avoid any confusion, that is to say the fleet is being sold at the values they are recorded at on our balance sheet. You see this in our implied used sales guidance of $1.5 billion at midpoint, which is an increase of $50 million versus our prior guidance.
Adjusted EBITDA guidance is $6.775 billion to $6.875 billion, which maintains the midpoint at $6.825 billion. And finally, I'll point out that we expect to generate free cash flow $2.3 billion to $2.5 billion, of which we will return a little over $1.4 billion to our investors through repurchases and dividends. This equates to more than $20 per share or around a 5% yield on return of capital at current share price levels.
So with that, let me turn the call over to the operator. Operator, could you please open the line?