The ascendancy of technology in America’s corporate hierarchy has conditioned us to equate “fast-growing” with “new.” When you hear that a business has logged profit and sales growth of 15% or more for three years in a row (the table stakes for joining Fortune’s Fastest-Growing Companies list), it’s easy to assume it’s rising on an updraft of innovation—thanks to a groundbreaking chip, a must-have “wearable,” or the Uber of something or other.
Look more closely at many other fast growers, however, and you’ll find stories of endurance rewarded—of businesses that performed just fine for decades before bigger shifts in the economy and culture helped them turbocharge their growth.
These companies and the two others featured here, water-management giant Ecolab (ECL) and retailer Ulta Beauty (ULTA), have near-term futures as promising as their recent pasts, and they demonstrate that in business, eye-catching blossoms are often attached to deep roots.
To see the list of our top 100 Fastest-Growing Companies, visit fortune.com/100-fastest-growing-companies.
A version of this article appears in the September 1, 2015 issue of Fortune magazine with the headline “Seizing Their Moment.”