Company lists · Data refreshed September 2026

Top 25 Process engineering companies based in Houston, United States

Name: Process engineering companies based in Houston, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 104 companies tracked

RevenueBase identified 104 process engineering companies headquartered in Houston, United States as of September 2026 and tracks 5,623 professional contacts across them, including 804 with verified work emails. Houston is the largest hub.

This list covers process engineering companies headquartered in Houston, United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 17, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 17, 2026 86% judged on-target in blind review

104Companies

5,623Contacts tracked

804Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest process engineering companies based in Houston, United States

Ranked by team size

Top 25 of 104 process engineering companies based in Houston, United States, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to process engineering companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Englobal	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	201-500	1,183 contacts →
	Partial evidence “Who We Are Englobal Founded in 1985, ENGlobal (NASDAQ: ENG) is a specialty engineering services firm that focuses on automation solutions and select EPCM projects for the energy…” Source: RevenueBase Database · checked Sep 17, 2026
2	Ingenero	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	501-1,000	532 contacts →
	Strong evidence “Ingenero's goal is to be the best process engineering firm by delivering the highest quality service and software solutions at the lowest cost.” Source: RevenueBase Database · checked Sep 17, 2026
3	Relevant Industrial, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	201-500	209 contacts →
	Partial evidence “Relevant Solutions is the preferred provider of process equipment solutions.” Source: RevenueBase Database · checked Sep 17, 2026
4	Prismecs	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	91 contacts →
	Indirect evidence “Prismecs is the trusted partner for operators that expect more from their supply chain and engineered solutions.” Source: RevenueBase Database · checked Sep 17, 2026
5	BD Energy Systems, LLC	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	65 contacts →
	Strong evidence “BD Energy Systems LLC located in Houston, TX, USA is a world leading engineering company operating in the Petrochemical, Fertilizer, Refining, and Gas Processing industry…” Source: RevenueBase Database · checked Sep 17, 2026
6	Blackline Engineering, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	46 contacts →
	Partial evidence “Blackline Engineering, LLC is a Houston based engineering consulting firm that offers innovative design and project management services that are tailored for each client.” Source: RevenueBase Database · checked Sep 17, 2026
7	Oliver Equipment Company	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	33 contacts →
	Indirect evidence “Oliver Equipment Company (OEC) is proud to service the Refining, Petrochemical, Chemical, Midstream Oil & Gas, offshore, Power Generation, Water Treatment, and General Industrial…” Source: RevenueBase Database · checked Sep 17, 2026
8	GAP Engineering INC	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	21 contacts →
	Strong evidence “Our expertise spans the full range of Process Engineering, Industrial Automation, Turn-Key Engineering Construction Projects, Fabrication, Turnaround and Field Services.” Source: RevenueBase Database · checked Sep 17, 2026
9	Calcgen Solutions	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	21 contacts →
	Partial evidence “Calcgen Solutions believes in quality engineering service delivery to our clients.” Source: RevenueBase Database · checked Sep 17, 2026
10	The Automation Group	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	21 contacts →
	Partial evidence “TAG is a recognized leader in providing system independent, specialized technical and management services for the implementation of process control system projects in the…” Source: RevenueBase Database · checked Sep 17, 2026
11	Ascent Engineering INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	20 contacts →
	Partial evidence “Ascent Engineering, Inc.” Source: RevenueBase Database · checked Sep 17, 2026
12	Reliable	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	1-10	17 contacts →
	Partial evidence “We are committed to empowering manufacturing and process plants with actionable insights and innovative strategies that drive lean operations, enhance efficiency, and boost…” Source: RevenueBase Database · checked Sep 17, 2026
13	Chemcad, A Datacor Product	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	201-500	14 contacts →
	Partial evidence “Datacor, formerly Chemstations, provides chemical process simulation software that enables chemical engineers to model and optimize processes, improve safety, and increase…” Source: RevenueBase Database · checked Sep 17, 2026
14	Flesch Engineering, LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	12 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
15	Epcon International	Strong evidence	Houston, United StatesHQ checked Sep 17, 2026	11-50	9 contacts →
	Strong evidence “EPCON’s mission is Ingenuity Simplified - we develop process engineering software that enables plant based engineers to make a significant difference in their company and in their…” Source: RevenueBase Database · checked Sep 17, 2026
16	Cleancap Technologies & Services	Partial evidence	Houston, United StatesHQ checked Sep 17, 2026	11-50	8 contacts →
	Partial evidence “CleanCap Technologies & Services (CleanCap) is an engineering driven industrial services and solutions provider specializing in furnaces, ovens, thermal oxidizers, and air…” Source: RevenueBase Database · checked Sep 17, 2026
17	Kalluri Group, Inc. KGI	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	1-10	8 contacts →
	Partial evidence “Kalluri Group, Inc.(KGI) is a consulting engineering company specializing in the design of Water and Wastewater Treatment Plants for refineries, petrochemical plants…” Source: RevenueBase Database · checked Sep 17, 2026
18	I-Solids	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	8 contacts →
	Partial evidence “Knight Engineering Solutions LLC dba i-SOLIDS is a specialized team of engineers, designers, and programmers who provide technical consulting and turnkey prototyping solutions: •…” Source: RevenueBase Database · checked Sep 17, 2026
19	G & M Engineering Services	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	8 contacts →
	Partial evidence “Advanced Expertise Over 25 years’ Experience in Engineering, Plant Maintenance & Reliability, Mechanical Integrity, Critical Spares, Operational Readiness, Startup Support…” Source: RevenueBase Database · checked Sep 17, 2026
20	Siege Engineering	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	1-10	7 contacts →
	Partial evidence “At Siege Engineering, we excel in advancing chemical manufacturing technologies, allowing us to ensure safety, lower costs, and faster, reliable outcomes.” Source: RevenueBase Database · checked Sep 17, 2026
21	Catmasters	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	1-10	6 contacts →
	Partial evidence “Catmasters LLC was formed in 2019 by a team of engineers from leading engineering roles within top tier global technology providers to oil refineries, gas, petrochemical and…” Source: RevenueBase Database · checked Sep 17, 2026
22	Hydrus Works	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	6 contacts →
	Indirect evidence “Hydrus Works helps energy and industrial facilities optimize their utility systems that underpin reliable operations.” Source: RevenueBase Database · checked Sep 17, 2026
23	Basal Solutions	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	1-10	6 contacts →
	Indirect evidence “Every company bears great ideas.” Source: RevenueBase Database · checked Sep 17, 2026
24	OPF Enterprises, LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	1-10	6 contacts →
	Indirect evidence “OPF Enterprises, LLC A Different Kind Of Consultant: Boots on the ground leadership and support.” Source: RevenueBase Database · checked Sep 17, 2026
25	Engineering & Terminal Services, LP	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	5 contacts →
	Partial evidence “Founded in January 2008, Engineering & Terminal Services, L.P.(E & TS) is a Consulting Engineering Company committed to providing the petrochemical industry with practical…” Source: RevenueBase Database · checked Sep 17, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: process engineering companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names process engineering companies.
Partial evidence: Its own public description names part of process engineering companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name process engineering companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 104 process engineering companies based in Houston, United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 804 reachable decision-makers.

Free signup · no credit card

View the full list →

Process engineering companies based in Houston, United States at a glance

As of Sep 17, 2026

14.3%Verified-email coverage

54.1Average contacts per company

11-50Median size (employees)

100.0%Largest-city concentration · Houston

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured across the whole United States list rather than for Houston, so it is reported there. Company counts and contact totals on this page are exact for Houston, over 104 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among process engineering companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Houston, United States whose own description of what they do matches “process engineering companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names process engineering companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among process engineering companies, and records with no verified work email. Companies headquartered outside Houston are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 804 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 17, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Process engineering companies by metro in the United States

Process engineering companies in Houston104
Process engineering companies in San Diego32
Process engineering companies in Chicago30
Process engineering companies in Austin29
Process engineering companies in Atlanta28

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names process engineering companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many process engineering companies are there based in Houston, United States?

RevenueBase identified 104 process engineering companies headquartered in Houston, United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Englobal, headquartered in Houston, tops this list with the largest team on record.

Which city has the most process engineering companies?

Houston leads with 104 headquartered companies, followed by San Diego (32) and Chicago (30).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 804 verified decision-maker contacts tracked across these 104 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 17, 2026.

Ready to reach these companies? Verified emails and direct dials for all 104 process engineering companies based in Houston, United States. Start with a free account, no credit card.

Download this list →

Related lists

Process engineering companies by geography

Browse the directory

Browse: Companies home · Process engineering companies in United States · All United States lists · All Process engineering companies lists · New lists

About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.