Company lists · Data refreshed September 2026

Top 25 Process engineering companies based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 3,604 companies tracked

RevenueBase identified 3,604 process engineering companies headquartered in the United States as of September 2026 and tracks 85,347 professional contacts across them, including 28,801 with verified work emails. Houston is the largest hub.

This list covers process engineering companies headquartered in the 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

3,604Companies

85,347Contacts tracked

28,801Verified emails

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

The 25 largest process engineering companies based in the United States

Ranked by team size

Top 25 of 3,604 process engineering companies based in the 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	Plexus Corp	Indirect evidence	Neenah, NC, United StatesHQ checked Sep 17, 2026	10001+	8,149 contacts →
	Indirect evidence “Since 1979, Plexus has been partnering with companies to create the products that build a better world.” Source: RevenueBase Database · checked Sep 17, 2026
2	Entrust Solutions Group	Partial evidence	Lisle, IL, United StatesHQ checked Sep 17, 2026	1,001-5,000	2,966 contacts →
	Partial evidence “ENTRUST Solutions Group, an ENR Top 100 company, provides comprehensive and dependable engineering, consulting, and automation services to pipeline companies, gas and electric…” Source: RevenueBase Database · checked Sep 17, 2026
3	Hexagon Asset Lifecycle Intelligence	Indirect evidence	Madison, AL, United StatesHQ checked Sep 17, 2026	10001+	2,630 contacts →
	Indirect evidence “Hexagon’s Asset Lifecycle Intelligence division helps clients design, construct and operate more profitable, safe and sustainable industrial facilities.” Source: RevenueBase Database · checked Sep 17, 2026
4	BW Design Group	Indirect evidence	St Louis, MO, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,555 contacts →
	Indirect evidence “BW Design Group is the only independent, fully integrated AEC firm powered by a Manufacturer's Mindset™.” Source: RevenueBase Database · checked Sep 17, 2026
5	GRAY	Partial evidence	Lexington, KY, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,477 contacts →
	Partial evidence “Founded by James Norris and Lois Howard Gray in 1960, Gray is a family-owned, fully integrated industrial design-builder specializing in engineering, architecture, construction…” Source: RevenueBase Database · checked Sep 17, 2026
6	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
7	Moldtek Technologies Limited	Indirect evidence	Cumming, GA, United StatesHQ checked Sep 17, 2026	501-1,000	1,107 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
8	DGS Technical Services INC	Indirect evidence	Elgin, IL, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,050 contacts →
	Indirect evidence “DGSTS, Inc.” Source: RevenueBase Database · checked Sep 17, 2026
9	ARI	Partial evidence	East Peoria, IL, United StatesHQ checked Sep 17, 2026	1,001-5,000	979 contacts →
	Partial evidence “ARi is a global engineering firm headquartered in East Peoria, Illinois, USA offering services for: Embedded Software, Product Engineering, Manufacturing Engineering and Testing &…” Source: RevenueBase Database · checked Sep 17, 2026
10	Production Modeling Corporation PMC	Partial evidence	Dearborn, MI, United StatesHQ checked Sep 17, 2026	n/a	970 contacts →
	Partial evidence “Today's advanced operations and industrial engineering, laser scanning and precision CAD, supply chain management, lean systems, finite capacity scheduling, software design, and…” Source: RevenueBase Database · checked Sep 17, 2026
11	Technosoft Engineering	Partial evidence	Morrisville, NC, United StatesHQ checked Sep 17, 2026	501-1,000	833 contacts →
	Partial evidence “Technosoft Engineering is a global provider of Digital Engineering & Consulting, Product Engineering, Manufacturing Engineering with substantial operations in North America and…” Source: RevenueBase Database · checked Sep 17, 2026
12	PAE	Partial evidence	Portland, OR, United StatesHQ checked Sep 17, 2026	201-500	744 contacts →
	Partial evidence “PAE provides mechanical and electrical engineering design, technology system design, energy modeling and analysis, and more.” Source: RevenueBase Database · checked Sep 17, 2026
13	Kinetics	Partial evidence	Livermore, CA, United StatesHQ checked Sep 17, 2026	1,001-5,000	734 contacts →
	Partial evidence “Founded in 1973, Kinetics is a full-service process and mechanical contractor specializing in the design and installation of process, mechanical, plumbing and HVAC systems.” Source: RevenueBase Database · checked Sep 17, 2026
14	Wunderlich-Malec Engineering, INC	Partial evidence	Eden Prairie, MN, United StatesHQ checked Sep 17, 2026	501-1,000	623 contacts →
	Partial evidence “Wunderlich-Malec Engineering is a nationally recognized, 100% employee-owned leader in advanced engineering and control system solutions.” Source: RevenueBase Database · checked Sep 17, 2026
15	E Tech Group	Partial evidence	West Chester, OH, United StatesHQ checked Sep 17, 2026	501-1,000	610 contacts →
	Partial evidence “E Tech Group is one of the largest engineering and system integration firms in the United States.” Source: RevenueBase Database · checked Sep 17, 2026
16	Middough INC	Indirect evidence	Cleveland, OH, United StatesHQ checked Sep 17, 2026	501-1,000	575 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
17	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
18	Richard	Partial evidence	Beaumont, TX, United StatesHQ checked Sep 17, 2026	1,001-5,000	501 contacts →
	Partial evidence “RICHARD is a full-service engineering, procurement and construction firm in the petrochemical and refining industry.” Source: RevenueBase Database · checked Sep 17, 2026
19	RFA Engineering	Indirect evidence	Eden Prairie, MN, United StatesHQ checked Sep 17, 2026	201-500	468 contacts →
	Indirect evidence “RFA serves 100's of clients ranging in size from Fortune 500 to entrepreneurial start-ups.” Source: RevenueBase Database · checked Sep 17, 2026
20	Anvil Corporation	Partial evidence	Bellingham, WA, United StatesHQ checked Sep 17, 2026	201-500	460 contacts →
	Partial evidence “Founded in 1971, Anvil Corporation is a 100% employee-owned engineering firm providing multi-discipline engineering, design, project management, procurement, and construction…” Source: RevenueBase Database · checked Sep 17, 2026
21	Electroimpact	Indirect evidence	Mukilteo, WA, United StatesHQ checked Sep 17, 2026	201-500	443 contacts →
	Indirect evidence “Electroimpact is a highly experienced provider of factory automation and tooling solutions.” Source: RevenueBase Database · checked Sep 17, 2026
22	Recon Management Services, INC	Partial evidence	Sulphur, LA, United StatesHQ checked Sep 17, 2026	501-1,000	420 contacts →
	Partial evidence “ReCon was established in 1995 and has matured as a high quality and competitive engineering consulting firm providing engineering design and project management services to the…” Source: RevenueBase Database · checked Sep 17, 2026
23	The PAC Group	Partial evidence	Troy, MI, United StatesHQ checked Sep 17, 2026	201-500	413 contacts →
	Partial evidence “The PAC Group is a global engineering and management services firm supporting diversified industries on a global basis.” Source: RevenueBase Database · checked Sep 17, 2026
24	Sterling Engineering	Partial evidence	Westchester, IL, United StatesHQ checked Sep 17, 2026	501-1,000	402 contacts →
	Partial evidence “Sterling is an award-winning professional engineering consulting and technical staffing company.” Source: RevenueBase Database · checked Sep 17, 2026
25	Mangan INC	Partial evidence	Long Beach, CA, United StatesHQ checked Sep 17, 2026	201-500	395 contacts →
	Partial evidence “Mangan Inc, an Automation & Engineering Firm, provides the highest quality services for the Refining, Gas & Oil, Pipeline, Renewable, Chemical, and Biopharm Industries.” 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 3,604 process engineering companies based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 28,801 reachable decision-makers.

Free signup · no credit card

View the full list →

Process engineering companies based in the United States at a glance

As of Sep 17, 2026

33.7%Verified-email coverage

23.7Average contacts per company

1-10Median size (employees)

2.9%Largest-city concentration · Houston

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

1,902

11-50

1,064

51-200

461

201-500

111

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 3,604 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 the 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 United States 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, 28,801 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

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 the United States?

RevenueBase identified 3,604 process engineering companies headquartered in the 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?

Plexus Corp, headquartered in Raleigh, 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 28,801 verified decision-maker contacts tracked across these 3,604 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 3,604 process engineering companies based in the 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 · 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.