Health care services for uninsured FloridiansVeggie noodles for the gluten-intolerant. Mattresses for hard-training athletes. While these businesses might be in very different industries, they're all part of one elite group: the top 10 fastest-growing privately held companies in the U.S.   

They have not become household names yet, but they've managed to do something that even many giant corporations have never done. Each of these companies has grown its revenue nearly 12,000 percent in just three years.

Check out their unique stories. 

10. NOM

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2019 Inc. 5000 rank No. 10 | Three-year growth 11,996% | 2018 revenue $21.4M

NOM, or Not Ordinary Media, is an advertising tech firm co-founded by Loren Rochelle and Brent Neill. The former co-workers started their own agency in 2014 to focus exclusively on optimizing clients' video distribution through channels like YouTube. As more brands discovered their ads on social media could wind up next to irrelevant--or inappropriate--content, Rochelle and Neill saw an opportunity to develop campaign-tracking software to lessen the risk. NOM has performance data on more than 300 million video placements around the web, giving clients the ability to microtarget their campaigns. The company, which still operates independently after selling to MTM, a New York City-based ad and marketing firm, in 2017, is on track to more than double its client base in 2019. --Lindsay Blakely

9. Providence Healthcare Management

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2019 Inc. 5000 rank No. 9 | Three-year growth 12,565% | 2018 revenue $225.9M

Cleveland's Providence Healthcare Management provides operational support to rehabilitation centers, assisted-living facilities, and other health care providers across Ohio and Kentucky. The company was founded in 2008 but really took off in 2017, when a "perfect storm" in the long-term care industry caused some national providers to get out, says CEO and founder Eli Gunzburg. Among other things, changes to Medicare and Medicaid sparked by the Affordable Care Act both prompted fewer people to seek care in facilities and shrank providers' profits. Gunzburg saw an opportunity: His company started adding buildings to its portfolio at a rapid clip, expanding from eight facilities in 2016 to more than 30 by the end of 2017. Gunzburg is now working to control that fast growth. He overhauled the company's senior leadership and introduced 29 simple directives--"listen generously," "practice blameless problem-solving"--that get circulated staff-wide. They're also used in hiring decisions and performance evaluations. --Sophie Downes

8. Connected Solutions Group

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2019 Inc. 5000 rank No. 8 | Three-year growth 12,701% | 2018 revenue $23.3M

In 2005, Michael Pittman didn't know anything about selling used electronic devices. But when the former building superintendent discovered that people were willing to pay good money for refurbished BlackBerry phones, he took a sales job at a reseller. Ten years later, he founded the Mechanicsville, Virginia-based Connected Solutions Group, or CSG, to do more than sell refurbished wireless devices. Pittman's company has also developed a specialty in creating mobile command centers for first responders and others who may need to power up to 168 laptops in a time of crisis. That business has become an entire division at CSG, and with partners like Verizon in tow, it expects to generate more than $26 million in 2019 revenue. --Guadalupe Gonzalez

7. Bear Mattress

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2019 Inc. 5000 rank No. 7 | Three-year growth 13,481% | 2018 revenue $20.5M

Scott Paladini grew up around mattress stores, and some of his first jobs were in mattress sales. After a stint in finance in New York City, in 2012 he moved back home to New Jersey and opened up his first store, Hibernate Bedding, in Bernardsville. Two years later, he opened another, in Hoboken, and saw direct-to-consumer mattress retailers popping up online. He set up a website, and created a mattress that differentiated itself from the growing field of competitors online: It had U.S. Food and Drug Administration-approved health benefits. He called it Bear, and marketed it to athletes. Without accepting outside funding, he sold $1 million in mattresses in one year. In three years' time, Bear Mattress, his online company, had $20 million in revenue. --Christine Lagorio-Chafkin

6. Cano Health

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2019 Inc. 5000 rank No. 6 | Three-year growth 14,183% | 2018 revenue $271.8M

In 2009, a year before Marlow Hernandez graduated from medical school, he noticed that many residents of his hometown of Pembroke Pines, Florida, were facing the depths of the recession without medical coverage. "People had significant health needs and could not afford care," he says. "I felt that I could build something by extracting costs out of the system to make it more affordable." He started by opening a primary care facility that offered patients medical and dental care for a flat rate of $30 a month, regardless of whether they had insurance. A decade later, his company Cano Health, which now offers a "primary care plus" menu of medical, dental, vision, specialty, and diagnostic services, has 36 clinics across Florida and roughly 1,000 employees. The business expects to surpass $350 million in 2019 revenue. --Brit Morse

5. Perpay

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2019 Inc. 5000 rank No. 5 | Three-year growth 18,166% | 2018 revenue $22.5M

Chris DiMarco is no stranger to the Inc. 5000. Before he founded Perpay, the Philadelphia-based fintech company he launched in 2014, he led to fast growth. The online lighting retailer landed at No. 161 in 2015, after growing its revenue 2,473 percent in three years to $3.4 million. His current company has grown by offering products for a very specific customer: credit-challenged consumers. At Perpay's Amazon-style shopping site, users can buy items from brands like KitchenAid and LG--basically anything you can find at Best Buy or Walmart, DiMarco says. They pay off the purchases over time--and interest free--with deductions from each paycheck. --Cameron Albert-Deitch

4. LadyBoss

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2019 Inc. 5000 rank No. 4 | Three-year growth 21,850% | 2018 revenue $32.4M

Physical fitness has long been central to Kaelin Tuell Poulin's life. When she was 19 and clinically obese, she lost 65 pounds in under a year. Just a few years later, that journey would serve as the centerpiece for her career, too. In 2015, she and her husband, Brandon Poulin, founded LadyBoss, an Albuquerque-based weight-loss business that sells resources and tools to women looking to shed pounds. For $27 a month, LadyBoss customers gain access to an app with meal plans, recipes, workout guides, and more. There's also personal training and coaching, a supplements line, and gear--all sporting a neon pink LadyBoss logo. The company is on track to book between $40 million and $50 million in revenue this year. --Anna Meyer

3. Cece's Veggie Co. 

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2019 Inc. 5000 rank No. 3 | Three-year growth 23,880% | 2018 revenue $24.9M

After learning that his kids couldn't eat pasta containing gluten, Mason Arnold got to work crafting noodle alternatives out of fresh vegetables. The concoction was a hit with his kids, and after he launched Cece's Veggie Co. in 2015, consumers were eating it up too. The Austin-based company also makes veggie-based rice, macaroni and cheese, and (coming soon) ramen noodles. Cece's sells in roughly 3,500 Whole Foods, Kroger, and Costco stores across the U.S. --Emily Canal

2. FreightWise

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2019 Inc. 5000 rank No. 2 | Three-year growth 30,548% | 2018 revenue $33.6M

Chris Cochran co-founded FreightWise in 2015 after noticing what he calls "black holes" in the freight industry--where companies are left in the dark on the progress of invoices through the freight pay and audit process. The Brentwood, Tennessee-based logistics startup wants to eliminate these gaps by giving each client direct access to more information. That transparency also extends to the company's workers: Freightwise allows every employee to see how he or she contributes to its revenue. "We want to be very open so that people know what's buttering the bread here," says Cochran. Today, Freightwise is on track to more than double its annual revenue from 2018. --Graham Winfrey 

1. Freestar

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2019 Inc. 5000 rank No. 1 | Three-year growth 36,680% | 2018 revenue $36.9M

David Freedman started out in 2004 selling ads in a dorm-room swimsuit calendar he created. It wasn't long before Freedman and his Freestar co-founder Chris Stark realized that other web publishers needed help serving ads on their sites. Today, the company is an ad-tech startup that works with more than 300 publishers. Clients like Fortune and Coindesk have helped propel Freestar's rocket-ship growth; the company now has 40 employees and offices in New York and Los Angeles, as well as its headquarters in Phoenix. --Sophie Downes

Corrections: An earlier version of this story mischaracterized FreightWise's business model. The company gives clients direct access to information through the freight pay and audit process. Additionally, the story mischaracterized the nature of Connected Solutions' relationship with Verizon. Verizon has a partnership with the company.