Is United Rentals Stock Increasing Your Market Risk?

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Investors who own or plan to buy United Rentals (URI), the largest equipment rental company in the world, probably already have the rest of their money following the S&P 500. This matters because a stock that moves harder than the market adds to a risk you already carry. So when the market has a good day or a bad one, does United Rentals stock move further than your index fund, or less?

United Rentals: Smaller Market Moves, Wider Swings

The stock moved less on the market’s ordinary days in the year to October 23, 2026. When the S&P 500 rose on an average day, a $10,000 holding in United Rentals gained $55.40, or 86.8% of the index’s rise. When the index fell on an average day, the same holding lost $45.50, which was only 76.2% of the index’s fall. Across all trading days in that year, the stock moved 0.94% for each 1% the index moved, a little less than the index itself.

United Rentals adds a different risk: its own swings are far wider than the market’s. Its volatility, which measures how widely its daily moves spread over a year, was 43.6% over the past year, compared to 12.7% for the S&P 500. In March 2026, the index’s worst month of that year, the S&P 500 fell 5.1%, while a $10,000 holding in United Rentals lost $1,327.

Will United Rentals Keep Swinging This Widely?

Most of those swings were not the market’s. Over the past year, daily moves in the stock aligned only loosely with the index’s. Their correlation was 0.27, a measure of how closely two prices move together on a scale where 1 means in step.

The business behind the stock is growing fast on large projects. Revenue in fiscal Q3 2026 reached $4.89 billion, up 15.7% from a year earlier. During its October 22, 2026 call, management said this growth comes from large projects across a variety of end markets. Projects are starting in energy, manufacturing, infrastructure and data centers, with its Specialty segment standing out. Management expects more of the same into 2027.

United Rentals raised its 2026 revenue forecast to a midpoint of $18.1 billion, up from $17.7 billion. Citing strong customer demand, the company also increased its plan for purchasing rental equipment. United Rentals is buying more fleet to keep up with that demand.

Has United Rentals Paid You For Its Swings?

If the next market day looks like an average one from the past year, United Rentals will add 86.8% of the index’s gain to your money on an up day and take 76.2% of its loss on a down day. The bigger risk is its own swings. Management also says its growth comes from large construction and industrial projects. If you already own builders, equipment makers or other businesses that depend on those projects, United Rentals is more of that same bet. Its rental revenue growth, in the report expected in January 2027, is the measure to watch.

Does This Mean You Should Act On URI?

Our purpose is to inform you with unique data so you make the right investment decisions. That said, betting on a single stock is always risky, no matter which direction you choose.

There is a smarter approach. Since its inception, the Trefis High Quality (HQ) Portfolio has returned 105%, beating the benchmark that combines the three major indices – the S&P 500, S&P Mid-cap, and Russell 2000. And it did so without taking the concentrated risk that comes with do-it-yourself stock picking. If that is how you want to invest, the HQ Portfolio is the place to start.

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