United Rentals is the largest equipment rental company in the world. It owns over one million pieces of equipment, from forklifts and aerial lifts to trench shields and portable generators, and rents them out by the hour, day, week, or month. Customers pay each time they need a machine rather than buying one outright. Construction companies, manufacturers, energy firms, utilities, and municipalities all use this service. In 2025, equipment rental revenue made up 86 percent of total revenues of $16.1 billion. The diagram below traces where the money goes.

Five years of financial data tell a clear story about growth. Revenue rose from $9.7 billion in 2021 to $16.1 billion in 2025. That is a rise of roughly 66 percent over four years. Operating cash flow grew alongside it, from $3.7 billion in 2021 to $5.2 billion in 2025. The business generates a lot of real cash, not just accounting profit.

But the trend in margins tells a more complicated story. Gross margin peaked at about 43 percent in 2022 and has slipped each year since, falling to roughly 38 percent in 2025. The company itself flags the reasons: higher costs for specialty segment services, lower margins from ancillary revenues, and a softer used-equipment market that reduced what United Rentals earned when selling off older machines. Growing revenue while margins compress is not unusual in a business that is spending heavily on fleet and acquisitions, but it is a pattern worth watching.

The debt load has grown alongside the business. Net debt was $9.5 billion in 2021 and reached $13.8 billion by 2025. The company holds $14.2 billion in total debt, and $4.1 billion of that carries variable interest rates, meaning the cost of that portion shifts when interest rates move. Interest rates on variable debt were 1.4 percent in 2021 and 5.4 percent in 2025. That is a significant change in the cost of borrowing, and it matters because much of United Rentals' growth has been funded by taking on debt to buy equipment and acquire competitors.

United Rentals operates in two segments. The general rentals segment covers cranes, aerial lifts, forklifts, and similar everyday construction equipment. The specialty segment covers trench safety gear, temporary power and heating and cooling systems, fluid containment equipment, mobile storage, and surface protection mats. In 2025, industrial and commercial construction customers each contributed roughly 48 percent of rental revenue, with residential work making up the remaining four percent. No single customer accounts for more than one percent of total revenues, which limits the risk that losing one client would hurt the whole business.

The three most serious risks the company discloses are all tied to the same underlying vulnerability: debt. First, United Rentals has $7.1 billion in goodwill on its balance sheet. If business weakens materially, that goodwill could be written down, forcing large charges against earnings. Second, $4.1 billion of the company's debt carries variable interest rates, so rising rates directly raise costs. Third, about 48 percent of rental revenue comes from industrial customers, including energy companies. When oil and gas prices fall, those customers cut spending sharply, which directly reduces demand for United Rentals' machines.

There is also a newer risk in the specialty segment. Specialty work now represents 31.7 percent of revenues and includes services like scaffolding design and electrical system design. These are more complex than simply dropping off a forklift. They expose the company to legal and operational risks that are harder to insure against and harder to predict. The company acknowledges these are harder to assess than traditional equipment rental.

Fleet productivity increased 2.2 percent in 2025, following a 4.1 percent increase in 2024. The slowdown suggests rates and utilization are not improving as quickly as before. The company added fleet through the Yak acquisition and organic spending. Average original equipment cost grew 3.9 percent in 2025. That means United Rentals is putting more capital into equipment, but the revenue return per dollar of fleet is growing more slowly than in prior years.

United Rentals holds about 15 percent of the North American equipment rental market. The industry is highly fragmented, with most competitors being small, one- or two-location businesses. That fragmentation has historically given United Rentals room to grow by acquiring smaller rivals. The Ahern Rentals acquisition in December 2022 and the Yak acquisition in March 2024 are the two most recent large examples. The company has also authorized a new $5.0 billion share repurchase program starting in 2026, signaling confidence in its own cash generation even as debt remains elevated.