3 Houston companies land on Deloitte’s Technology Fast 500 list

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Three Houston companies ranked on Deloitte's annual list, with two cracking the top 100. Photo via Getty Images

Three Houston companies have made this year’s Deloitte North America Technology Fast 500 list.

The report ranks the fastest-growing technology, media, telecommunications, life sciences, fintech, and energy tech companies in North America. The Houston companies to make the list, along with their revenue growth rates from 2021-2024, include:

  • No. 16 Action1 Corp., a provider of cybersecurity software. Growth rate: 7,265 percent
  • No. 92 Cart.com, a commerce and logistics platform. Growth rate: 1,053 percent
  • No. 312 Tellihealth, a remote health care platform. Growth rate: 244 percent

“Houston’s unique blend of entrepreneurial energy and innovation continues to strengthen the local business community, and I’m thrilled to see Houston companies honored on the 2025 Deloitte Technology Fast 500 list. Congratulations to all the winners,” said Melinda Yee, managing partner in Deloitte’s Houston office.

Action1 is no stranger to lists like the Deloitte Technology Fast 500. For instance, the company ranked first among software companies and 29th overall on this year’s Inc. 5000, a list of the country’s fastest-growing private companies. Its growth rate from 2021 to 2024 reached 7,188 percent.

Mike Walters, president and co-founder of Action1, said in August that the Inc. 5000 achievement “reflects the dedication of Action1’s global team, who continue to execute against an ambitious vision: a world where cyberattacks exploiting vulnerabilities are entirely prevented across all types of devices, operating systems, and applications.”

Atlanta-based Impericus, operator of an AI-powered platform that connects health care providers with pharmaceutical and life sciences companies, topped the Deloitte list with a 2021-24 growth rate of 29,738 percent.

“Our mission is to set the standard for ethical AI-powered physician connections to pharma resources, accelerating and expanding patient access to needed treatments,” said Dr. Osama Hashmi, a dermatologist who’s co-founder and CEO of Impiricus. “As we continue to innovate quickly, we remain committed to building ethical bridges across this vital ecosystem.”

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These are the four fastest-growing tech companies in Houston, according to Deloitte. Photo by Shobeir Ansar/Getty Images

4 fast-growing Houston tech companies secure spots on Deloitte list

big wins

Deloitte’s annual North America Technology Fast 500 list includes four Houston companies this year — all boasting of significant growth.

For Houston, Direct Digital Holdings, Inc. took the highest-ranking spot at No. 101 (up from 108 previous year) with 1,184 percent growth. NatGas Hub LLC (No. 286, 407 percent growth), Liongard (No. 437, 246 percent growth), and Stratus Medical LLC (No. 483, 212 percent growth) also made the list, which is an annual ranking of the fastest-growing North American companies in technology, energy tech sectors, telecommunications, life sciences, media, and fintech.

"Houston continues to demonstrate its prowess in fostering growth and technological advancement and I’m incredibly proud to see some of our local companies making significant strides and earning their well-deserved spots on the 2024 Deloitte Technology Fast 500 list,” Houston managing partner at Deloitte Melinda Yee says in a news release.

Award winners were selected based on fiscal year revenue growth from 2019 to 2022.

The companies achieved revenue growth ranging from 201 percent to 153,625 percent over the three-year time frame with an average growth rate of 1,981 percent and a median growth rate of 460 percent, according to a news release. Texas accounts for 6 percent of the winning companies with 73 percent of the companies from Texas are in the software sector.

“These companies exemplify the entrepreneurial spirit and innovative mindset that define Houston's dynamic business ecosystem,” Yee adds.

In 2023, the Houston representation looked similar. Direct Digital Holdings again topped the Houston rankings at No. 108, with Liongard, NatGasHub.com, and P97 Networks also showing substantial growth. As a state, Texas had 30 companies that made the list of the 541 ranked. In 2022, just one Houston company was recognized, as at No. 372 Onit reported revenue increase of 369 percent.

Biopharmaceutical company TG Therapeutics, Inc. was the No.1 spot in 2024 with a growth rate of 153,625 percent from 2020 to 2023. See the full list here.
Three Houston tech companies are seeing big business growth, according to Deloitte's report. Graphic via Deloitte

3 Houston companies make Deloitte's fastest-growing tech list

biz is booming

Three Houston companies have earned spots on this year's edition of the North American Technology Fast 500.

The three Houston honorees are:

  • Enercross, a provider of logistics software for the energy sector. It appears at No. 31 on the Fast 500 list, with revenue growth of 6,230 percent from 2017 to 2020.
  • Onit, which offers workflow and AI technology for legal, compliance, sales, IT, HR, and finance departments. It lands at No. 304, with a 408 percent rise in revenue from 2017 to 2020. According to Crunchbase, Onit has reeled in $216.6 million in venture capital.
  • Graylog, a provider of log management software. It sits at No. 309, with revenue growth of 402 percent from 2017 to 2020. Graylog has collected $27.4 million in venture capital, according to Crunchbase. That includes an $18 million round announced this summer.

The North America Technology Fast 500, sponsored by professional services firm Deloitte, is an annual ranking of the fastest-growing tech, media, telecom, life sciences, and energy tech companies in North America.

"The Houston companies on this year's Fast 500 list are transforming the way our city does business by combining technological innovation with entrepreneurial spirit," Amy Chronis, Houston managing partner at Deloitte, says in a news release. "I'm inspired by the ways these organizations have succeeded amid unprecedented times, and I look forward to seeing their progress in 2022."

The top-ranked company is Irvine, California-based medical device company Axonics, whose revenue soared 87,037 percent from 2017 to 2020. The top-ranked Texas company is Austin-based Shipwell, where revenue climbed 32,670 percent from 2017 to 2020. Shipwell provides a shipment-tracking platform. Overall, 5 percent of the Fast 500 companies are based in Texas.

Both Enercross and Onit showed up on last year's Fast 500. Enercross ranked 37th in 2020, with revenue growth of 5,881 percent, and Onit ranked 190th, with revenue growth of 641 percent. Meanwhile, Graylog is a new entrant this year.

Two Houston companies fell off the Fast 500 this year:

  • Lexicon Pharmaceuticals, which ranked 328th last year with revenue growth of 306 percent.
  • Vendor Credentialing Services (symplr), a tech platform that simplifies vendor services, compliance, and more for health professionals. It appeared at No. 426 last year, notching revenue growth of 221 percent.

Not surprisingly, Silicon Valley accounted for one-fifth of the companies in this year's Fast 500, followed by the New York City metro area (12 percent) and New England (8 percent). Nearly three-fourths of the Fast 500 companies specialize in software, and 81 percent of the companies have received venture capital at some point.

"Each year, the Technology Fast 500 shines a light on leading innovators in technology, and this year is no exception," says Paul Silverglate, leader of the U.S. technology sector at Deloitte. "In the face of innumerable challenges resulting from the pandemic, the best and brightest were able to pivot, reinvent and transform and grow."

Four Houston-based companies have been ranked among the country's fastest growing tech businesses. Photo via Getty Images

4 Houston companies make fastest-growing tech biz list

H-town representing

In a newly released annual ranking, four Houston-based technology companies scored spots.

Deloitte's 26th annual North America Technology Fast 500 is an annual ranking of the fastest-growing North American companies across tech sectors. The companies on the list were selected based on percentage fiscal year revenue growth from 2016 to 2019. The Houston companies that made the top 500 were:

  • No. 37 (5,881 percent growth): Enercross — An oil and gas logistics software company.
  • No. 190 (641 percent growth): Onit — A B2B software company that designs streamlining solutions.
  • No. 328 (306 percent growth): Lexicon Pharmaceuticals Inc. — A biopharmaceutical company developing treatments for diseases.
  • No. 426 (221 percent growth): Vendor Credentialing Services (aka symplr)— A tech platform that simplifies vendor services, compliance, and more for health professionals.

"The varied industries represented in this year's local Fast 500 winners is evidence of Houston's positive momentum in diversifying its core competencies beyond the energy sector," says Amy Chronis, Houston managing partner at Deloitte, in the release. "Innovation continues to be the driving force behind our city's evolution, and the Fast 500 winners are helping spur its progress. They inspire and provide a glimpse into our future."

According to the release, the 2020 Technology Fast 500 companies achieved revenue growth ranging from 175 percent to 106,508 percent over the three-year time frame, with a median growth rate of 450 percent.

Silicon Valley-based companies dominated the list, accounting for the top three companies as well as 20 percent of the entire list. The second largest region represented was New York, with 13 percent of the list.

In terms of sector, software has the biggest hold on the ranking with 71 percent of the companies being categorized in that realm, which is the highest percentage Deloitte has ever seen in this study.

The report also looked ate venture backing and found that this year 81 percent of the 500 fastest-growing tech companies received venture funding, which includes, according to the release, 26 of the top 30 companies.

"Each year the Technology Fast 500 listing validates how important technology innovation is to our daily lives. It was interesting to see this year that while software companies continued to dominate, biotech companies rose to the top of the winners list for the first time, demonstrating that new categories of innovation are accelerating in the pursuit of making life easier, safer and more productive," says Mohana Dissanayake, partner at Deloitte, in the release. "We extend our congratulations to these well-deserved winners — who all embody a spirit of curiosity, and a never-ending commitment to making technology advancements possible."

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10+ can't-miss Houston business and innovation events for October

where to be

Editor's note: Healthcare and energy conferences headline this month's slate of innovation events in Houston. But there's also time for family-friendly gatherings and pickleball socials. Here’s what not to miss in October and how to register. Please note: this article may be updated to add more events.

Oct. 2 — Joy in Medicine Initiative Symposium

The Houston Methodist Joy in Medicine Initiative Symposium will explore the power of connection in enhancing professional fulfillment for clinicians and healthcare teams, this year with the theme of "Forging New Paths: Leadership, Connection & Innovation to Sustain Joy in Medicine." Hear from Dr. Shlomit Schall, Houston Methodist Physician Organization president and CEO and chief physician executive; Houston Methodist CEO Marc Boom; and Dr. Albert Wu, from Johns Hopkins, author of Therefore, Let us Rejoice: Sustaining Joy in Medicine. Stick around for a networking happy hour.

This event is Friday, Oct. 2, from 8:30 a.m.-4:30 p.m. at Thompson Houston on Allen Parkway. Find more information here.

Oct. 6-7 — Hydrogen Americas Summit and Exhibition

Hydrogen Americas delivers an unparalleled opportunity to explore how hydrogen integrates with CCUS and other energy solutions under the new U.S. and Americas energy paradigm. This event moves to Houston in 2026, providing unmatched access to industry leaders and opportunities. The summit will include CCUS-dedicated sessions integrated directly into the conference programming, providing deeper insights into carbon capture, utilization and storage. Look forward to networking opportunities to connect with global suppliers, regional developers and key policymakers.

This event begins Oct. 6 at George R. Brown Convention Center. Register here.

Oct. 6-7 — Annual Energy Summit — Energy, Risk, and Geopolitics

The 10th annual energy summit is co-hosted by Baker Botts and the Center for Energy Studies at Rice University's Baker Institute. This year's summit, “Energy, Risk, and Geopolitics,” will explore how a changing geopolitical landscape and shifts in supply chain risks are impacting investment, innovation and market dynamics. The two-day program will include discussions spanning petroleum and LNG markets, critical minerals, electricity reliability, AI and power demand.

This event begins Oct. 6 at 7:30 am at James A Baker III Hall. The event will also be livestreamed. Register here.

Oct. 7 – Rockets Get You to Orbit. Culture Gets You to Stay

The Ion will host a morning discussion exploring humanity’s future in space. The event will feature Rick Tumlinson, author of Why Space? The Purpose of People; Scott Solomon, author of Becoming Martian; and David Alexander and Alexander Regier of Rice University’s new Space Humanities Initiative. The conversations will be moderated by EarthLight Foundation Director Junaid Mian.

This event is Wednesday, Oct. 7, from 8:30-11 a.m. at the Ion. Register here.

Oct. 8 — Greentown Labs’ Fall Pickleball Social

Greentown Labs hosts its fall social at Pickle Lab HTX this month. Enjoy friendly matches, networking and light bites. All skill sets are welcome.

This event is Thursday, Oct. 8, from 5:30-7:30 p.m. at Pickle Lab HTX. Register here.

Oct. 10 – Ion Family Tech Festival

Bring the whole family out to the second Ion Family Tech Festival. Kids will get to participate in hands-on STEAM workshops and learn more about STEAM-related careers.

This event is Saturday, Oct. 10, from 9 a.m.-12 p.m. at the Ion. Register here.

Oct. 13 – Mercury Fund Day at the Ion

Don’t miss the latest installment of Mercury Fund Day at the Ion, previously known as Software Day. The recurring monthly event features office hours (by application), a keynote and networking opportunities.

This event is Tuesday, Oct. 13, from 3:30-7 p.m. at the Ion. Register here.

Oct. 14 — Future of Global Energy Conference

This October, the sixth annual Future of Global Energy Conference kicks off, convening influential leaders from across energy, technology, finance and public policy who will come together to explore the forces defining the next era of global energy and Houston’s role in shaping it. Ryan Lance, Executive Chairman of ConocoPhillips and 2027 Chair of the Greater Houston Partnership’s Board of Directors, is the keynote speaker for this year’s conference, bringing a global perspective on rising demand, market volatility and Houston’s role in the next era of energy growth.

This event takes place Oct. 14 at the Marriott Marquis. Register here.

Oct. 17 — Energy Day 2026

Energy Day Houston is the nation’s largest free, family-friendly STEM festival. It features over 50 interactive exhibits and live demonstrations focused on traditional and emerging energy career paths to power up your curiosity.

This event begins at 11 a.m. on Oct. 17 at Sam Houston Park. Get details here.

Oct. 22 — Rice360 Innovation for Healthcare Access Conference

Researchers and innovators from Rice University, the Texas Medical Center, non-profit organizations, healthcare providers and others will come together to explore gaps in healthcare at the Innovation for Healthcare Access Conference. The event will feature speakers, workshops and case study presentations and will focus on innovations for the health of women and children in underserved rural and urban communities across Texas.

This event is Thursday, Oct. 22, from 8 a.m.-5 p.m. at the Rice University BioScience Research Collaborative (BRC). Register here.

Oct. 28-29 – TiECon 2026

TiE Houston, TiE Dallas and TiE Austin are joining forces to host TiEcon Texas 2026 at the Ion this month. The event will focus on how automation, artificial intelligence and emerging technologies are reshaping Texas industries, the economy and daily life. The conference will feature keynotes, panels, fireside chats and the TiE Hatch Pitch Competition.

This event starts Thursday, Oct. 29, at the Ion. Register here.

UH secures $5M in philanthropic gifts to bolster engineering, nursing

major gifts

The University of Houston has received two significant philanthropic gifts to advance innovation and healthcare, the college announced this month.

Manmohan Singh Kalsi and Marie-Luise Schubert Kalsi granted $4 million to UH’s Cullen College of Engineering to support endowed and current funds for graduate fellowships and industry interest in the mechanical and aerospace fields.

The gift is the Department of Mechanical and Aerospace Engineering’s largest donation in years, according to UH, and will establish two endowed professorships to attract and retain leading faculty. It will also create the Kalsi Faculty Research Fund, which aims to take emerging research to the next level.

Additionally, UH says it will also bring industry experts to campus to present and collaborate with students via the forthcoming Kalsi Seminar Series.

Manmohan Kalsi earned both his master’s degree and Ph.D. in mechanical engineering from UH. He went on to found Sugar Land-based Kalsi Engineering in 1978, which pioneered hydrodynamic rotary sealing technology and valve technology for nuclear power plants. In 2014, he established an endowed professorship within Cullen College in honor of the late UH professor Gabriel Fazekas.

"This gift provides a tremendous boost to our department's strategic momentum,” Karolos Grigoriadis, chair of the Department of Mechanical and Aerospace Engineering, said in a news release. “By simultaneously supporting faculty, graduate researchers and collaborative seminars, the Kalsis are strengthening every part of our research enterprise and creating new opportunities for discovery, collaboration and student mentorship.”

Meanwhile, Houston’s The Hamill Foundation also gave a $1 million gift to UH’s Andy and Barbara Gessner College of Nursing. The funds will establish The Hamill Foundation Endowed Professorship in Community Care Nursing, to support a faculty member focused on community-based nursing education, partnerships, research, and outreach to underserved communities in Houston.

Additionally, the funding will go toward efforts to address nurse shortages through the newly established UH Health program. The Hamill Foundation has donated $6 million previously to UH through the years, but the latest $1 million is the largest single investment from the foundation to date.

“The Hamill Foundation continues to help us raise the bar for nursing education and address the nursing shortage,” Kathryn Tart, founding dean and professor at Gessner College and Humana Endowed Dean's Chair in Nursing, said in a news release. “The enduring commitment and generosity of The Hamill Foundation allow us to answer the call and educate generations of competent and caring nursing professionals.”

Both of the recent gifts help fund UH’s $1 billion Can’t Stop Houston: The Centennial Campaign. As of September, the university had raised more than $881 million. UH turns 100 years old in March 2027.

SpaceX's supersized Starship rocket launches into orbit for first time

Out in Space

SpaceX launched its enormous Starship into orbit for the first time Monday, September 28, and successfully delivered the most advanced Starlink satellites yet, but cut the flight short to ensure safety.

The spacecraft reentered over the Pacific and splashed down north of Hawaii three hours after blasting off from Texas. The company had been aiming for a 10-hour flight, spanning six full laps around Earth, to prove its readiness for NASA’s Artemis moon program.

Starship tipped over and erupted in flames upon splashdown, a dramatic end to the mission.

Elon Musk's Starship almost didn't make it to orbit when one of its engines shut down prematurely. But with everything else working well and the bad engine no longer needed, flight controllers decided, after several tense minutes, to proceed as planned.

“Starship is orbital,” Mission Control announced to cheers.

NASA Administrator Jared Isaacman congratulated SpaceX on reaching orbit and “managing every step in a safe, responsible and especially inspirational way.”

Rocket carries 26 of Musk's most advanced Starlink satellites

Musk’s showpiece rocket — the biggest and most powerful ever built — carried 26 of the latest Starlinks to join the 11,000 older models already providing internet service. They popped out of the spacecraft one by one, drawing more cheers from the SpaceX crowd at the Starbase launch site.

The decision to end the flight early came soon afterward. SpaceX said hours later in an online update that the decision was made “out of an abundance of caution” because of the early engine trouble.

It was Starship’s 14th full-scale launch from Texas’ southern tip in three years. Earlier test flights ventured no farther than the Indian Ocean halfway around the world, often crashing in flames and briefly skimming space.

This time, the intent was for SpaceX to circle the globe from an altitude of 170 miles (275 kilometers) — not just once but six times over almost 10 hours, ending with a Pacific splashdown near Chile. While Starship achieved the proper orbit, zipping along at 17,500 mph (28,000 kph), flight controllers opted to play it safe and bring it back several hours sooner, after just a couple of laps.

The first-stage booster was never meant to return to the Starbase launch site either, dropping instead into the Gulf of Mexico within minutes of the morning liftoff.

SpaceX wants to ensure that everything works before flying Starship back to Starbase. If the spacecraft breaks apart over land and rains debris onto people, “our popularity would diminish very rapidly,” Musk said at a business summit earlier this month. “That’s why we’re being extremely cautious here.”

Depending on the findings from Monday's orbital debut, the next Starship could return to the launch pad, where giant mechanical arms would grab the hovering spacecraft. If the catch works — Musk gives it even or slightly better odds — then SpaceX will refly the spacecraft by year’s end or early next year.

The 407-foot (124-meter) rocket was designed from the start to be fully reusable, a key to lowering launch costs. SpaceX managed to salvage the last Starship from the Indian Ocean in July. Engineers modified the newly launched Starship’s heat shield based on hands-on inspections of the recovered spacecraft, which is being tugged back to Starbase.

SpaceX wants Starship to be certified for orbital flight

SpaceX is pressing hard to certify Starship for orbital flight, a vital step toward moon and Mars travel.

NASA’s Artemis III mission is coming up as soon as next summer, a triple-launch docking exercise in orbit around Earth between an Orion capsule full of astronauts and competing lunar landers. Jeff Bezos’ Blue Moon would blast off first, followed by Orion — which would close in for a linkup — and then Musk’s Starship for a docking with Orion once Blue Moon is unleashed.

The next mission, Artemis IV, is slated for no sooner than 2028 and would have astronauts landing on the moon in either Blue Moon or Starship, whichever is ready first. Subsequent moonshots will alternate between the two billionaires’ landers.

Musk originally developed Starship for Mars, intending to launch scores of them with the red planet’s first settlers. For now, he plans to focus on the moon and use Starship to haul satellites into orbit by the truckload, phasing out the company’s frailer Falcon 9 rocket within several years. A second Starship launch site is nearing completion at Florida’s Kennedy Space Center and a third is planned for Louisiana.

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