| # | Company | Employees |
|---|---|---|
| 1 |
American Bureau of Shipping (ABS)ww2.eagle.org
Establishes safety standards and technical solutions for marine and offshore industries through ship classification, engineering research, and global regulatory compliance support. |
6,833 |
| 2 |
Waste Connectionscareers.wasteconnections.com
Integrated services company providing solid waste collection, transfer, disposal, and recycling services in the US and Canada with a focus on employee empowerment and community impact |
5,355 |
| 3 |
Chevron Phillips Chemical Companycpchem.com
Leading global manufacturer and supplier of olefins, polyolefins, aromatics, specialty chemicals, plastic piping, and polymer resins with extensive facilities. |
4,704 |
| 4 |
Woodforest National Bankwoodforest.com
Community-focused bank providing consumer and business financial products with strong customer service and employee ownership across multiple states. |
4,192 |
| 5 |
ABS Groupabs-group.com
Provider of data-driven risk and reliability solutions for critical assets in marine, offshore, oil, gas, chemical, government, and industrial sectors worldwide |
1,966 |
| 6 |
TETRA Technologies, Inc.onetetra.com
Global energy services company specializing in bromine-based fluids, calcium chloride solutions, water management, frac flowback, and well testing services with a focus on low carbon energy markets |
1,599 |
| 7 |
Southwestern Energyexpandenergy.com
An independent energy company engaged in natural gas, gas liquids, and oil exploration, development, production, and marketing for 90 years |
1,356 |
| 8 |
STRIKEstrikeusa.com
The company provides end-to-end solutions for pipeline, facilities, and energy infrastructure projects, including major capital projects, infrastructure services, and renewable energy initiatives |
1,234 |
| 9 |
ABS Consultingabs-group.com
Stay updated with valuable content and expert insights from our Knowledge Center by following our official LinkedIn page Visit our website for more information |
933 |
| 10 |
Orion S.A.orioncarbons.com
Supplier of carbon black powder and pellets for tires, coatings, batteries, plastics, providing reinforcement, conductivity, durability, and UV protection worldwide. |
836 |
| 11 |
Elevate Patient Financial Solutionsยฎelevatepfs.com
Trusted RCM partner providing innovative solutions for healthcare providers nationwide, specializing in revenue cycle challenges with industry expertise and tailored services |
727 |
| 12 |
MedDataelevatepfs.com
Leader in revenue cycle management services for healthcare providers, specializing in patient engagement, improving financial outcomes, and offering various core services |
559 |
| 13 |
Kenyon International Emergency Serviceskenyoninternational.com
Provides specialized support during incidents for private and public sectors, globally, with resources in three strategic locations, since 1906. |
521 |
| 14 |
PERMA-PIPEpermapipe.com
Global engineered pipe services company offering anti-corrosion coatings, insulation solutions, leak detection systems, custom fabrication, and engineering support Specializing in complex piping systems worldwide |
513 |
| 15 | 452 | |
| 16 |
City Ambulance Servicecityambu.com
A leading ambulance service providing quality emergency and non-emergency care with a focus on patient well-being, team training, and ethical practices |
376 |
| 17 |
Connect Realty.com, Inc.connectrealtycareers.com
A technology-driven real estate brokerage based in Texas, offering agents tools and services across multiple states to simplify processes and enhance professionalism |
344 |
| 18 |
Zerto, acquired by Hewlett Packard Enterprise company in 2021hpe.com
Provider of cloud data management and protection solutions enabling seamless application protection, recovery, and mobility across on-premises and cloud environments for global customers |
332 |
| 19 |
Total Airport Services (TAS), LLCtasinc.aero
A leading aviation service provider offering ground handling, cargo warehousing, passenger services, and airport support at eight major US airports |
317 |
| 20 |
Crossfire, LLCcrossfire-llc.com
A leading energy services provider in Western states, offering oil and gas field construction, civil infrastructure, pipeline construction, hauling, reclamation, and utility services |
306 |
| 21 |
Planet Fordplanetford45.com
A dealership in Spring, Texas, serving greater Houston area, specializing in new Ford vehicles and high fleet sales, with top rankings nationally |
302 |
| 22 |
Cole Healthcolehealth.com
A therapy company providing Speech, Occupational, Physical, and ABA Therapy to positively impact the lives of families through transformative disciplines |
291 |
| 23 |
Twin Eagletwineagle.com
A leading energy marketer and midstream operator focusing on natural gas and crude oil in North America, offering integrated services and strong industry relationships |
210 |
| 24 |
Champions School of Real Estatechampionsschool.com
A leading provider of award-winning real estate education in Texas since 1983, offering pre-licensing and continuing education courses in various formats |
185 |
| 25 |
Prime Oceanprimeoceangroup.com
Offshore staffing and services company focusing on providing qualified candidates for drilling, maintenance, marine, and engineering positions in the Gulf of Mexico and globally |
182 |
| 26 |
Tarsco, a TF Warren Companytfwarren.com
Specializing in engineering, manufacturing, and construction of customized aboveground storage tank systems globally for industrial clients with a focus on safety and quality |
175 |
| 27 |
Promark Research Corporationpromarkresearch.com
This company in Texas provides state-of-the-art research, data collection, and tabulation services to various organizations for their market research needs |
167 |
| 28 |
ExxonMobil Proxximaโข Polyolefin Thermoset Resin Systemsproxxima.com
Innovative producer of sustainable thermoset materials using advanced polymer technology to provide high-performance alternatives for various applications |
104 |
| 29 |
P2 Energy Services, LLCp2energyservices.com
A leading supply chain solutions provider offering procurement, optimization, digital tools, and sustainable products to navigate the energy landscape effectively |
79 |
| 30 |
Kingsley Constructors, Inc. A MasTec Companykci.cc
An innovative provider of energy construction solutions and specialty services, focusing on safety, value, design-build solutions, and high-quality projects |
78 |
| 31 |
Momentum Glassmomentum-glass.com
This company specializes in designing, manufacturing, and installing innovative glazing systems for building enclosures and interior glass applications |
68 |
| 32 |
JR Expressjrxpress-logistics.webflow.io
Innovative logistics company providing full truckload and heavy LTL services across the Continental US and Canada |
54 |
| 33 |
Register Real Estate Advisorsrrea.com
A fast-growing real estate firm in Houston and Northern suburbs, leveraging technology for top-notch service and customer satisfaction in every transaction |
44 |
| 34 |
Cbi Company Ltdcbi.com
The company specializes in designing, engineering, and constructing large energy infrastructure projects, offering EPC solutions and utilizing proven technologies |
44 |
| 35 |
RE/MAX ONE The Woodlands & Springrmxone.com
Experienced real estate agency with top quality agents, each averaging over 15 years of experience, serving the local area |
42 |
| 36 |
Styled Real Estateswistakandscanlin.com
A full-service Real Estate Brokerage firm based in Spring, TX, serving Houston and surrounding areas with comprehensive real estate services |
37 |
| 37 |
WALT Labswaltlabs.io
A dedicated cloud computing consulting company providing customized solutions to businesses, driving growth, efficiency, and customer satisfaction through expertise and support |
32 |
| 38 |
FreightMax Logistics Partners, LLCfreightmaxlogistics.com
A third-party logistics company partnering with shippers and carriers to provide efficient, reliable, and affordable freight transportation solutions in North America |
25 |
| 39 |
Pressurelinkspressurelinks.com
Leading OEM/private label manufacturer of high performance fittings including high pressure stainless steel fittings, specialty adapters in exotic materials, and OEM connection products |
21 |
| 40 |
De Ford Law Firm, PLLCdefordlawfirm.com
A legal firm specializing in family law, providing honest and practical legal advice and support in areas such as divorce, estate planning, and child custody |
20 |
| 41 |
Evolve Collectiveevolve-collective.com
A consulting firm specializing in partnering with Energy industry companies to address barriers, capture opportunities, and provide customized, results-driven solutions |
15 |
| 42 |
Quanta Services, South Regionquantaservices.com
A leading specialty contractor providing integrated solutions for electric power, pipeline, industrial, and communications industries with highly trained skilled workforce |
12 |
| 43 | 8 | |
| 44 |
Hooks Industrial Inchooksindustrial.com
A leading manufacturer specializing in industrial parts, rotating equipment, engineered solutions, and complete working assemblies |
8 |
| 45 |
Pushpak Logistiks LLCpushpak-logistiks.com
Logistics company specializing in tailored solutions for US and Canada, helping businesses focus on growth by streamlining the shipping process |
7 |
| 46 |
True North Energy Corp.onlinesportsbettingsite.org
An oil and gas company founded in 2004, focused on acquiring, exploring, developing, and producing properties in Colorado and Oklahoma |
6 |
| 47 |
Logistics Prime Corplogisticsprimecorp.com
A US-based freight brokerage company offering truckload, ocean, and rail freight services, along with warehousing, distribution, and logistics solutions |
6 |
| 48 |
Faith Racefaithusa.com
A leading provider of high-quality BMX and MTB race gear, designed and tested by top riders worldwide, now expanding to the USA market |
5 |
| 49 |
The Grijalva Groupthegrijalvagroup.com
Residential real estate specialists with over 20 years of experience in The Woodlands, Spring, Conroe, Tomball, Oak Ridge North, & Shenandoah, Texas |
5 |
| 50 |
ARC Glass, L.L.C.arcglassservices.com
This company specializes in providing custom glass solutions for homes and businesses, including shower doors, mirrors, tabletops, windows, and glass fabrication services |
5 |
| 51 |
OI Managementoimgmt.com
A full-service commercial real estate firm in Spring, Texas, offering property management, leasing, sales brokerage, and tenant representation services for retail properties |
3 |
| 52 |
Chic Floorschicfloors.com
Creative upscale flooring and kitchen/bath renovation company in northwest Houston with a luxury showroom providing endless inspiration for home improvement projects |
3 |
| 53 |
Black Belt Operatingblackbeltoperating.com
Independent oil and gas company dedicated to fueling national progress, offering tailored energy solutions with a focus on excellence, innovation, and sustainability |
3 |
| 54 |
MACH 5 RACINGmachfiveracing.com
This company specializes in coaching runners and cyclists to improve their performance through a holistic approach focusing on mental game, training, nutrition, restorative practices, and life balance |
2 |
| 55 |
Sawmill Trail Holdings, Inc.sawmilltrail.com
The company focuses on promoting responsible energy use, acquisition, investment, and technological innovation to support thriving communities worldwide |
2 |
| 56 |
Avail Capital GroupAvailCG.com
Provider of financial services for individuals and businesses, offering a range of solutions to help clients achieve their goals |
2 |
Turn this list into pipeline
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How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Oct 24, 2026.
The same list elsewhere in United States
- The largest companies in the United States 91,669
- The largest companies in California 12,813
- The largest companies in New York State 10,485
- The largest companies in Texas 8,086
- The largest companies in Florida 4,945
- The largest companies in Illinois 4,175
- The largest companies in Pennsylvania 3,110
- The largest companies in Massachusetts 3,093
- The largest companies in Georgia 2,632
- The largest companies in Ohio 2,618
- The largest companies in New Jersey 2,569
- The largest companies in Virginia 2,503
- The largest companies in Michigan 2,346
- The largest companies in North Carolina 2,174
- The largest companies in Alabama 1,806
- The largest companies in Washington State 1,785
- The largest companies in Colorado 1,774
- The largest companies in Minnesota 1,700
- The largest companies in Maryland 1,527
- The largest companies in Wisconsin 1,482
- The largest companies in New York 6,920
- The largest companies in San Francisco 2,030
- The largest companies in Houston 1,791
- The largest companies in Chicago 1,668