Company lists · Data refreshed September 2026

Top 25 Refinery engineering firms based in the United States

Name: Refinery 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 17, 2026 3,365 companies tracked

RevenueBase identified 3,365 company matches for refinery engineering firms associated with the United States as of September 2026 and tracks 123,226 professional contacts across them, including 45,120 with verified work emails. Houston is the largest hub.

This list covers company matches for refinery engineering firms associated with the United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 17, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 17, 2026 How this list was built

3,365Companies

123,226Contacts tracked

45,120Verified emails

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The 25 largest refinery engineering firms based in the United States

Ranked by team size

Top 25 of 3,365 company matches for refinery engineering firms based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 17, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Zachry Group	Exact match	San Antonio, TX, United StatesHQ recorded Sep 17, 2026	10001+	6,824 contacts →
	Exact match “Zachry Group is North America's pacesetter in turnkey engineering, construction, maintenance, turnaround and fabrication services to the energy, chemicals, power, manufacturing…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
2	CITGO	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	1,001-5,000	4,396 contacts →
	Exact match “CITGO Petroleum Corporation is a recognized leader in the refining industry and operates under the well-known CITGO brand.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
3	S&b	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	5,001-10,000	3,510 contacts →
	Exact match “S&B is an engineer and constructor that designs and builds some of the largest and most complex industrial facilities in the world.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
4	Entrust Solutions Group	Exact match	Lisle, IL, United StatesHQ recorded Sep 17, 2026	1,001-5,000	2,966 contacts →
	Exact match “ENTRUST Solutions Group, an ENR Top 100 company, provides comprehensive and dependable engineering, consulting, and automation services to pipeline companies, gas and electric…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
5	FTI	Exact match	Menasha, WI, United StatesHQ recorded Sep 17, 2026	1,001-5,000	2,741 contacts →
	Exact match “Faith Technologies Incorporated (FTI) is a dynamic organization comprised of construction, engineering, manufacturing and renewable energy experts.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
6	The Haskell Company	Exact match	Jacksonville, FL, United StatesHQ recorded Sep 17, 2026	1,001-5,000	2,213 contacts →
	Exact match “Haskell delivers over $3 billion annually in Architecture, Engineering, Construction (AEC) and Consulting solutions to assure certainty of outcome for complex capital projects…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
7	IMEG	Exact match	Rock Island, IL, United StatesHQ recorded Sep 17, 2026	1,001-5,000	1,985 contacts →
	Exact match “Leaders in Engineering and Innovation.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
8	Hargrove Engineers & Constructors	Exact match	Mobile, AL, United StatesHQ recorded Sep 17, 2026	1,001-5,000	1,877 contacts →
	Exact match “Hargrove is a full-service engineering, procurement, and construction management firm delivering multi-discipline engineering, project delivery, controls & automation, and…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
9	Yates Construction	Exact match	Philadelphia, MS, United StatesHQ recorded Sep 17, 2026	5,001-10,000	1,713 contacts →
	Exact match “Yates Construction is part of The Yates Companies, Inc.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
10	Audubon Companies	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	1,001-5,000	1,488 contacts →
	Exact match “Founded in 1997, Audubon Companies LLC provides EPC, consulting, fabrication, and field services to energy and industrial operators across the globe.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
11	Kpff Consulting Engineers	Exact match	Seattle, WA, United StatesHQ recorded Sep 17, 2026	1,001-5,000	1,487 contacts →
	Exact match “KPFF is a multi-office, multi-discipline engineering firm.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
12	Partner Engineering & Science, INC	Exact match	Torrance, CA, United StatesHQ recorded Sep 17, 2026	1,001-5,000	1,358 contacts →
	Exact match “Partner Assessment Corp.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
13	Delek US	Exact match	Brentwood, TN, United StatesHQ recorded Sep 17, 2026	1,001-5,000	1,297 contacts →
	Exact match “Delek US is a diversified downstream energy company with assets in petroleum refining, asphalt, renewable fuels, and logistics.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
14	Atwell, LLC	Exact match	Southfield, MI, United StatesHQ recorded Sep 17, 2026	1,001-5,000	1,290 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
15	Englobal	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	201-500	1,183 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
16	Barr Engineering CO	Exact match	Minneapolis, MN, United StatesHQ recorded Sep 17, 2026	1,001-5,000	1,088 contacts →
	Exact match “Barr provides engineering and environmental consulting services to clients across the Midwest, throughout the Americas, and around the world.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
17	DGS Technical Services INC	Exact match	Elgin, IL, United StatesHQ recorded Sep 17, 2026	1,001-5,000	1,050 contacts →
	Exact match “DGSTS, Inc.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
18	Gulf Companies	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	1,001-5,000	1,046 contacts →
	Exact match “At Gulf Companies, we are driven by our mission to serve a vital role in the global energy industry.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
19	Coffman Engineers	Exact match	Seattle, WA, United StatesHQ recorded Sep 17, 2026	501-1,000	859 contacts →
	Exact match “The right team is more than an advantage.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
20	Percheron, LLC	Exact match	Katy, TX, United StatesHQ recorded Sep 17, 2026	501-1,000	776 contacts →
	Exact match “Percheron streamlines energy infrastructure projects through a comprehensive EPCM (Engineering, Procurement, Construction Management) approach.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
21	EDG	Exact match	Metairie, LA, United StatesHQ recorded Sep 17, 2026	501-1,000	700 contacts →
	Exact match “EDG Inc.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
22	Wyatt Field Service Company	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	1,001-5,000	686 contacts →
	Exact match “WYATT is recognized for executing complex maintenance, outage, turnaround, and capital construction projects across the Oil, Gas & Chemical, and Power markets.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
23	Vepica	Exact match	Katy, TX, United StatesHQ recorded Sep 17, 2026	1,001-5,000	680 contacts →
	Exact match “Vepica is a multinational engineering company with more than 53 years experience in the energy, industrial, infrastructure and petrochemical sectors.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
24	Wunderlich-Malec Engineering, INC	Exact match	Eden Prairie, MN, United StatesHQ recorded Sep 17, 2026	501-1,000	623 contacts →
	Exact match “Wunderlich-Malec Engineering is a nationally recognized, 100% employee-owned leader in advanced engineering and control system solutions.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
25	Applied Consultants	Exact match	Longview, TX, United StatesHQ recorded Sep 17, 2026	501-1,000	578 contacts →
	Exact match “Since 1991, Applied Consultants Inc.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “refinery engineering firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 3,365 refinery engineering firms based in the United States

See the full list, filter by size, metro and specialty, and access 45,120 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Refinery engineering firms based in the United States at a glance

As of Sep 17, 2026

36.6%Verified-email coverage

36.6Average contacts per company

11-50Median size (employees)

10.0%Largest-city concentration · Houston

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

1,512

11-50

1,111

51-200

487

201-500

138

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 3,365 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with the United States whose business descriptions match “refinery engineering firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 45,120 professional contacts with verified work emails across the full matched dataset. 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.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Refinery engineering firms by metro

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “refinery engineering firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many refinery engineering firms are there based in the United States?

RevenueBase identified 3,365 company matches for refinery engineering firms associated with the United States as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Zachry Group tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most refinery engineering firms?

Houston leads with 338 company records, followed by New York (41) and Austin (36).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 45,120 professional contacts with verified work emails tracked across these 3,365 companies; direct dials are available where recorded.

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.

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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 SmartSearch, 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.