Company lists · Data refreshed September 2026

Top 25 Chemical engineering firms based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 1,232 companies tracked

RevenueBase identified 1,232 chemical engineering firms headquartered in the United States as of September 2026 and tracks 40,333 professional contacts across them, including 13,459 with verified work emails. Houston is the largest hub.

This list covers chemical engineering firms 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 16, 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 16, 2026 86% judged on-target in blind review

1,232Companies

40,333Contacts tracked

13,459Verified emails

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The 25 largest chemical engineering firms based in the United States

Ranked by team size

Top 25 of 1,232 chemical engineering firms based in the United States, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to chemical engineering firms: 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	Zachry Group	Strong evidence	San Antonio, TX, United StatesHQ checked Sep 16, 2026	10001+	6,824 contacts →
	Strong evidence “Zachry Group is North America's pacesetter in turnkey engineering, construction, maintenance, turnaround and fabrication services to the energy, chemicals, power, manufacturing…” Source: RevenueBase Database · checked Sep 16, 2026
2	Hargrove Engineers & Constructors	Partial evidence	Mobile, AL, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,877 contacts →
	Partial evidence “Hargrove is a full-service engineering, procurement, and construction management firm delivering multi-discipline engineering, project delivery, controls & automation, and…” Source: RevenueBase Database · checked Sep 16, 2026
3	Audubon Companies	Indirect evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,488 contacts →
	Indirect evidence “Founded in 1997, Audubon Companies LLC provides EPC, consulting, fabrication, and field services to energy and industrial operators across the globe.” Source: RevenueBase Database · checked Sep 16, 2026
4	Atwell, LLC	Partial evidence	Southfield, MI, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,290 contacts →
	Partial evidence “Atwell is a full-service consulting, engineering and construction services firm that delivers a broad range of creative solutions to clients in the real estate and land…” Source: RevenueBase Database · checked Sep 16, 2026
5	Gulf Companies	Indirect evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,046 contacts →
	Indirect evidence “At Gulf Companies, we are driven by our mission to serve a vital role in the global energy industry.” Source: RevenueBase Database · checked Sep 16, 2026
6	EDG	Indirect evidence	Metairie, LA, United StatesHQ checked Sep 16, 2026	501-1,000	700 contacts →
	Indirect evidence “EDG Inc.” Source: RevenueBase Database · checked Sep 16, 2026
7	Middough INC	Indirect evidence	Cleveland, OH, United StatesHQ checked Sep 16, 2026	501-1,000	575 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 16, 2026
8	Ingenero	Partial evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	501-1,000	532 contacts →
	Partial 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 16, 2026
9	Arb, INC	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 16, 2026	1,001-5,000	528 contacts →
	Indirect evidence “ARB Inc.” Source: RevenueBase Database · checked Sep 16, 2026
10	Hunt Guillot & Associates HGA	Partial evidence	Ruston, LA, United StatesHQ checked Sep 16, 2026	501-1,000	505 contacts →
	Partial evidence “HGA is a leading engineering, consulting, and program management company that has been delivering innovative and sustainable solutions to our clients for over 29 years.” Source: RevenueBase Database · checked Sep 16, 2026
11	Richard	Partial evidence	Beaumont, TX, United StatesHQ checked Sep 16, 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 16, 2026
12	Anvil Corporation	Partial evidence	Bellingham, WA, United StatesHQ checked Sep 16, 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 16, 2026
13	Recon Management Services, INC	Partial evidence	Sulphur, LA, United StatesHQ checked Sep 16, 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 16, 2026
14	Sterling Engineering	Partial evidence	Westchester, IL, United StatesHQ checked Sep 16, 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 16, 2026
15	Mangan INC	Strong evidence	Long Beach, CA, United StatesHQ checked Sep 16, 2026	201-500	395 contacts →
	Strong 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 16, 2026
16	C&i Engineering	Strong evidence	Louisville, KY, United StatesHQ checked Sep 16, 2026	201-500	313 contacts →
	Strong evidence “Chemical & Industrial Engineering, Inc.(C&I) is a full-service Engineering, Design & Procurement firm, providing hands-on design expertise for increasing capacity, improving…” Source: RevenueBase Database · checked Sep 16, 2026
17	ARION	Indirect evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	201-500	310 contacts →
	Indirect evidence “We are A-Team of engineers specializing in the energy industry.” Source: RevenueBase Database · checked Sep 16, 2026
18	KAP Project Services, LTD	Indirect evidence	Deer Park, TX, United StatesHQ checked Sep 16, 2026	201-500	304 contacts →
	Indirect evidence “KAP Project Services is a leading project management and consulting firm serving the petrochemical, power, LNG, pharmaceutical, and oil & gas industries.” Source: RevenueBase Database · checked Sep 16, 2026
19	ADF Engineering, INC	Partial evidence	Miamisburg, NE, United StatesHQ checked Sep 16, 2026	51-200	286 contacts →
	Partial evidence “ADF Engineering provides comprehensive Process and Facility engineering services to the food, feed, biofuels, bioscience, and consumer products industries.” Source: RevenueBase Database · checked Sep 16, 2026
20	Fateh Group	Indirect evidence	Cherryfield, ME, United StatesHQ checked Sep 16, 2026	1,001-5,000	277 contacts →
	Indirect evidence “FATEH GROUP is committed to provide its customers with high-quality services and products.” Source: RevenueBase Database · checked Sep 16, 2026
21	Nexus Engineering Group	Partial evidence	Cleveland, OH, United StatesHQ checked Sep 16, 2026	201-500	255 contacts →
	Partial evidence “Nexus Engineering Group is a full-service engineering, procurement, and construction management (EPCm) firm headquartered in Cleveland, Ohio with offices in Toledo, Ohio, Midland…” Source: RevenueBase Database · checked Sep 16, 2026
22	Hyde Engineering Consulting	Partial evidence	Louisville, CO, United StatesHQ checked Sep 16, 2026	201-500	253 contacts →
	Partial evidence “Hyde E+C is an international engineering consulting firm that helps companies operate more efficiently, get products to market more quickly, meet regulatory requirements more…” Source: RevenueBase Database · checked Sep 16, 2026
23	BSI Engineering	Partial evidence	Mason, OH, United StatesHQ checked Sep 16, 2026	201-500	247 contacts →
	Partial evidence “BSI Engineering is a full-service engineering consulting firm dedicated to delivering innovative, efficient, and effective solutions across various industries.” Source: RevenueBase Database · checked Sep 16, 2026
24	Chemtex	Partial evidence	Wilmington, NC, United StatesHQ checked Sep 16, 2026	201-500	230 contacts →
	Partial evidence “Chemtex is a global engineering and technology company.” Source: RevenueBase Database · checked Sep 16, 2026
25	Waldemar S. Nelson & Co., INC	Indirect evidence	New Orleans, LA, United StatesHQ checked Sep 16, 2026	201-500	211 contacts →
	Indirect evidence “For over a half century our professional staff - in meeting technical, schedule, budget, and regulatory requirements - has successfully completed projects in the U.S.” Source: RevenueBase Database · checked Sep 16, 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: chemical engineering firms. 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 chemical engineering firms.
Partial evidence: Its own public description names part of chemical engineering firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name chemical engineering firms. 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 1,232 chemical engineering firms based in the United States

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Chemical engineering firms based in the United States at a glance

As of Sep 16, 2026

33.4%Verified-email coverage

32.7Average contacts per company

11-50Median size (employees)

10.2%Largest-city concentration · Houston

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

601

11-50

389

51-200

164

201-500

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 1,232 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 chemical engineering firms, 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 “chemical engineering firms”. 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 chemical engineering firms), 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 chemical engineering firms, 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, 13,459 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 16, 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.

Chemical engineering firms by metro

Chemical engineering firms in Houston126

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 chemical engineering firms, 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 chemical engineering firms are there based in the United States?

RevenueBase identified 1,232 chemical engineering firms 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?

Zachry Group, headquartered in San Antonio, tops this list with the largest team on record.

Which city has the most chemical engineering firms?

Houston leads with 126 headquartered companies, followed by Tulsa (15) and Atlanta (14).

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 13,459 verified decision-maker contacts tracked across these 1,232 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 16, 2026.

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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.