These are the 5 fastest-growing companies in Houston, according to a recent report

ready, set, grow

Inc. magazine has identified the fastest-growing companies in Houston. Nick Bee/Pexels

Bellaire-based startup Instafuel is pumping up its revenue in a big way.

Among the 250 fastest-growing companies in Texas identified by Inc. magazine, Instafuel tops the group of businesses based in the Houston metro area and ranks fifth statewide. Houston-based companies make up 68 of the state's fast-growing companies — eight Houston companies make up the top 25 list.

Instafuel, whose official corporate name is Fuel Husky LLC, provides mobile refueling services to B2B clients. The Inc. ranking, released March 13, shows Instafuel posted revenue growth of 1,353 percent from 2016 to 2018.

According to a November 2019 article published by CSP magazine, Instafuel has expanded to 30 trucks that have dispensed nearly 10 million gallons of fuel to more than 150 B2B clients in major Texas metro markets like Houston, Dallas-Fort Worth, and Austin. CSP covers the convenience and petroleum retailing industry.

"We've been bootstrapping … in stealth mode for the last four years, just trying to grow this business one [client] by one, trying to truly understand what it means to be a mobile refueler, or what we call a compact mobile refueler, and trying to target and understand the business model for small- to medium-sized business fleets," Nour Baki, vice president and co-founder of Instafuel, told the magazine.

Ranked second in the Houston area and sixth statewide by Inc. is Spring-based Bellatorum Resources LLC, whose revenue shot up 1,261 percent from 2016 to 2018. Bellatorum, a veteran-owned and veteran-operated investment company, specializes in mineral rights and oil royalty acquisitions.

"I think our work ethic and customer service is what makes us different from our competitors," Chris Bentley, president and CEO of Bellatorum Resources, told the Oil & Gas Council in July 2018.

"Based on the feedback I consistently receive from mineral owners, they tell me that many of our competitors fail to return phone calls and emails, and sometimes even fail to treat them with common courtesy and respect during their business dealings," Bentley added. "We believe in putting the mineral owner first, which always pays off for us."

At No. 3 in the Houston area and No. 8 statewide is Houston-based Sarvicus LLC. Sarvicus, an IT services and utilities provider, grew revenue by 1,048 percent from 2016 to 2018.

"Whether it's a process, piece of equipment, or a tool, we try to optimize its efficiency. When we are successful, that often translates to benefits for our customers," Sarvicus co-founder and CEO Marc Packard told CIOReview magazine.

Houston-based SIA Solutions LLC appears at No. 4 among Houston-area companies and No. 9 among Texas companies. From 2016 to 2018, revenue at the professional services engineering and consulting firm soared 1,030 percent.

"Because of our client-first philosophy, we're willing to take on tough challenges and deliver. It's in our culture. It's natural to us," CEO Srini Neralla told the McFerrin Center for Entrepreneurship at Texas A&M University's Mays Business School in November 2019. We put together strong teams comprising of firms our size or larger, including universities, in order to deliver what our clients want."

With a 2016-18 growth rate of 824 percent, Houston-based Zahroof Valves Inc. nails down the No. 5 spot among Houston-area companies and No. 14 among Texas companies. Zahroof Values makes and markets specialized valves for reciprocating gas compressors. Its investors include Saudi Aramco Energy Ventures LLC, the investment arm of oil giant Saudi Aramco.

In an August 2019 release, Zahroof Valves CEO Tony Gioffredi said: "Our commitment to driving positive change [in] the oil and gas industry is shown through our innovative products … ."

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Houston lab-test startup seeks $1M for nationwide expansion

Testing Access

Health care industry veteran Jim Gebhart knew there had to be a better way for patients to access lab services, especially those with high health insurance deductibles or no insurance at all.

“This challenge became deeply personal when a close family member developed a serious illness, and we struggled to secure prompt appointments,” Gebhart tells InnovationMap. “It’s incredibly frustrating when a loved one cannot receive timely care simply because of provider shortages or the limited capacity of traditional clinics.”

Driven by the desire to knock down lab-test barriers, Gebhart founded Houston-based TheLabCafe.com in 2024. The platform provides access to low-cost medical tests without requiring patients to carry health insurance. TheLabCafe serves patients in six states: Texas, Georgia, Louisiana, Nevada, New Mexico and Oklahoma. Gebhart, the startup’s CEO, says that by the end of March, LabCafe will be offering services in 20 more states and the District of Columbia.

Gebhart has spent more than 30 years in the lab industry. His career includes stints at Austin-based Clinical Pathology Laboratories, Ohio’s Cleveland Clinic Laboratories and Secaucus, New Jersey-based Quest Diagnostics.

“Since nearly 80 percent of disease diagnoses rely on laboratory testing, I decided to leverage my background to create a more accessible, self-directed process for individuals to order blood and urine tests on their own terms — when and where they need them,” says Gebhart.

So far, Gebhart is self-funding the startup. But he plans to seek $700,000 to $1 million in outside investments in late 2026 to support the nationwide expansion and the introduction of more services.

TheLabCafe contracts with labs for an array of tests, such as cholesterol, hepatitis, metabolic, testosterone, thyroid and sexually transmitted infection (STI) tests. A cholesterol test obtained through TheLabCafe might cost $29, compared with a typical cost of perhaps $39 to $59 without insurance.

A health care professional reviews every test, both when the test is ordered and when the results are delivered, often within 24 hours. After receiving test results, a patient can schedule a virtual visit with a health care professional to go over the findings and learn potential treatment options.

Gebhart says TheLabCafe particularly benefits uninsured patients, including those in Texas. Among the states, Texas has the highest rate of uninsured residents. U.S. Census Bureau data shows 21.6 percent of adults and 13.6 percent of children in Texas lacked health insurance in 2024.

“Uninsured patients often pay the highest prices in the health care system,” Gebhart explains. “We address this by offering straightforward pricing and convenient access to testing without requiring insurance.”

“Our rates are intentionally set to remain affordable, helping individuals take a proactive approach to their health,” he adds. “Regular testing enables people to identify potential health issues early and track their progress as they make lifestyle changes. Ultimately, you can’t measure improvement without data — and laboratory results provide that data.”

Houston geothermal startup secures $97M Series B for next-gen power

fresh funding

Houston-based geothermal energy startup Sage Geosystems has closed its Series B fundraising round and plans to use the money to launch its first commercial next-generation geothermal power generation facility.

Ormat Technologies and Carbon Direct Capital co-led the $97 million round, according to a press release from Sage. Existing investors Exa, Nabors, alfa8, Arch Meredith, Abilene Partners, Cubit Capital and Ignis H2 Energy also participated, as well as new investors SiteGround Capital and The UC Berkeley Foundation’s Climate Solutions Fund.

The new geothermal power generation facility will be located at one of Ormat Technologies' existing power plants. The Nevada-based company has geothermal power projects in the U.S. and numerous other countries around the world. The facility will use Sage’s proprietary pressure geothermal technology, which extracts geothermal heat energy from hot dry rock, an abundant geothermal resource.

“Pressure geothermal is designed to be commercial, scalable and deployable almost anywhere,” Cindy Taff, CEO of Sage Geosystems, said in the news release. “This Series B allows us to prove that at commercial scale, reflecting strong conviction from partners who understand both the urgency of energy demand and the criticality of firm power.”

Sage reports that partnering with the Ormat facility will allow it to market and scale up its pressure geothermal technology at a faster rate.

“This investment builds on the strong foundation we’ve established through our commercial agreement and reinforces Ormat’s commitment to accelerating geothermal development,” Doron Blachar, CEO of Ormat Technologies, added in the release. “Sage’s technical expertise and innovative approach are well aligned with Ormat’s strategy to move faster from concept to commercialization. We’re pleased to take this natural next step in a partnership we believe strongly in.”

In 2024, Sage agreed to deliver up to 150 megawatts of new geothermal baseload power to Meta, the parent company of Facebook. At the time, the companies reported that the project's first phase would aim to be operating in 2027.

The company also raised a $17 million Series A, led by Chesapeake Energy Corp., in 2024.

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This article originally appeared on our sister site, EnergyCapitalHTX.com.

10+ can't-miss Houston business and innovation events in February

where to be

Editor's note: February may be short, but its event calendar isn’t. From recurring monthly favorites to the return of annual celebrations and summits, here's what not to miss and how to register. Please note: this article may be updated to include additional event listings.

Feb. 2 — Entrepreneurship Roundtable with OPEN

Join founders, builders and innovators as they explore what it takes to create, scale and sustain meaningful ventures. This event, hosted by Open Houston, will be moderated by Faisal Bhutto, president and CEO of Houston-based end-to-end IT and cybersecurity company Alykas.

This event is Monday, Feb. 2, from 11 a.m.-1 p.m. at the Ion. Register here.

Feb. 3 — Tech+Tequila Talk: Tax Equity: Aligning Incentives for Founders, Investors & Philanthropy

Hear from guest speaker Cesar de la Cerda, founder and CIO of EnvisionVest, at the latest installment of Tech and Tequila Talk. The event will focus on using the tax code as a powerful fundraising tool.

This event takes place Tuesday, Feb. 3, from 5-7 p.m. at the Ion. Register here.

Feb. 5 — Ion Block Party Mardi Gras

Let the good times roll while networking with potential collaborators, mentors and investors at the Ion. Food and drink will be available, and the Ion will provide drink tickets for one free drink at Second Draught upon check-in.

This event is Thursday, Feb. 5, from 4-7 p.m. at the Ion. Register here.

Feb. 10 — Mercury Fund Day at the Ion

The Ion and Houston's Mercury Fund will host this special event, previously known as Software Day. The event will feature a panel that dives into how Mercury is pushing the boundaries of what’s possible with agentic AI and blockchain. A select group of early-stage software startups will also participate in office hours before the panel. Afterwards, all attendees can network during happy hour at Second Draught.

This event is Tuesday, Feb. 10, from 3:30-7:30 p.m. Register here.

Feb. 11-12 – In-Space Physical AI Workshop

Rice Nexus is bringing together industry leaders, government agencies and academia to explore the cutting edge of AI in space exploration. Matt Ondler, president of Aegis Aerospace, will present the keynote address. Other industry leaders from NASA Johnson Space Center, Intuitive Machines, Microsoft and Rice University and other organizations will participate. The event will close with the Inaugural Space Galette Reception hosted by the Consulate General of France in Houston and the Rice Space Institute.

This event begins Wednesday, Feb. 11, at the Ion. Register here.

Feb. 12 — State of the City

Houston First Corporation and the Greater Houston Partnership will host Mayor John Whitmire’s State of the City luncheon. Whitmire will share an update on his administration’s progress since taking office and highlight his top priorities that will continue to elevate Houston and its economy.

This event is Thursday, Feb. 12, from 11 a.m.-1:30 p.m. at the Hilton Americas-Houston. Register here.

Feb. 12 — Positioning Houston as the Brain Capital of the World

David Gow, CEO of the Center for Houston's Future, will present "Positioning Houston as the Brain Capital of the World" at the University of Houston Honors College Leadership Forum. Gow will share how Project Metis aims to establish Houston as a global hub for brain health research, innovation and economic development.

This event is Thursday, Feb. 12, from 7:30-9:30 a.m. at The Junior League of Houston. Register here.

Feb. 13 — From Research to Enterprise: Immigration & Innovation

Innov8 Hub will host an in-person seminar as part of its Startup Resources Series, focused on the intersection of immigration law, entrepreneurship and technology commercialization. The session will feature guest speakers Mario Cantu, Shilpa Ghurye and Vikesh Patel of KM&D PLLC, who will share insights for founders and innovators navigating legal pathways while building and scaling technology-driven ventures.

The event is Friday, Feb. 13, from 1-2 p.m. at the Innovation Center at UH Technology Bridge, Building 4. Register here.

Feb. 18-20 — TMC AI Summit

UTHealth Houston and Texas Children’s Hospital are bringing back the TMC AI Summit for its third year. This event is focused on translating advanced AI innovations into practical, real-world solutions for the biomedical and healthcare industries. It will be broken up into three tracks and will feature poster and oral presentations, workshops and tutorials, industry talks and student research showcases.

The event begins Wednesday, Feb. 18, at the Duncan Neurological Research Institute. Register here.

Feb. 26 — Transition on Tap

Greentown Labs’ signature networking event returns in February to foster conversations and connections within Houston's climate and energy transition ecosystem. Entrepreneurs, investors, students, philanthropists and more are invited to attend, meet colleagues, discuss solutions and engage with the growing community.

The event begins Monday, Feb. 26, from 5:30-7:30 p.m. at Greentown Labs. Register here.

Feb. 26 — NASA Tech Talk

Every fourth Thursday of the month, NASA experts, including longtime engineer Montgomery Goforth, present on technology development challenges NASA’s Johnson Space Center and the larger aerospace community are facing, and how they can be leveraged by Houston’s innovation community. Stick around after for drinks and networking at Second Draught.

This event is Thursday, Feb. 26, from 6-7 p.m. at the Ion. Register here.

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