Company lists · Data refreshed September 2026

Top 25 Offshore structural engineering firms based in the United States

RevenueBase identified 2,041 offshore structural engineering firms headquartered in the United States as of September 2026 and tracks 61,989 professional contacts across them, including 20,928 with verified work emails. Houston is the largest hub.

This list covers offshore structural 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 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
2,041Companies
61,989Contacts tracked
20,928Verified emails
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The 25 largest offshore structural engineering firms based in the United States

Ranked by team size
Top 25 of 2,041 offshore structural engineering firms 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 offshore structural 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Partial evidenceHouston, TX, United StatesHQ checked Sep 17, 202610001+20,135 contacts →

Partial evidence

“McDermott is a premier provider of engineering and construction solutions to the energy industry.”

Source: RevenueBase Database · checked Sep 17, 2026
2Indirect evidenceHouston, TX, United StatesHQ checked Sep 17, 20261,001-5,0001,488 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 17, 2026
3Indirect evidenceHouston, TX, United StatesHQ checked Sep 17, 20261,001-5,0001,298 contacts →

Indirect evidence

“Welcome to Walter P Moore!”

Source: RevenueBase Database · checked Sep 17, 2026
4Indirect evidenceElgin, IL, United StatesHQ checked Sep 17, 20261,001-5,0001,050 contacts →

Indirect evidence

“DGSTS, Inc.”

Source: RevenueBase Database · checked Sep 17, 2026
5Strong evidenceHouston, TX, United StatesHQ checked Sep 17, 2026n/a789 contacts →

Strong evidence

“Energo Engineering is a KBR Company that provides the full package of structural integrity management (SIM) and advanced structural engineering services for offshore floating and…”

Source: RevenueBase Database · checked Sep 17, 2026
6Indirect evidenceGlen Allen, VA, United StatesHQ checked Sep 17, 2026501-1,000707 contacts →

Indirect evidence

“Schnabel is a trusted partner in building the foundation for project success.”

Source: RevenueBase Database · checked Sep 17, 2026
7Indirect evidenceMetairie, LA, United StatesHQ checked Sep 17, 2026501-1,000700 contacts →

Indirect evidence

“EDG Inc.”

Source: RevenueBase Database · checked Sep 17, 2026
8Indirect evidenceGalliano, LA, United StatesHQ checked Sep 17, 20261,001-5,000612 contacts →

Indirect evidence

“Established in 1948 in Grand Isle, LA, GIS began as a modest company serving the commercial fishing industry.”

Source: RevenueBase Database · checked Sep 17, 2026
9Indirect evidenceNew Orleans, LA, United StatesHQ checked Sep 17, 20261,001-5,000567 contacts →

Indirect evidence

Source: RevenueBase Database · checked Sep 17, 2026
10Strong evidenceNew York, NY, United StatesHQ checked Sep 17, 2026501-1,000512 contacts →

Strong evidence

“Founded in New York City in 1969, DeSimone provides structural engineering, façade and building envelope consulting, vertical transportation consulting, forensics, structural…”

Source: RevenueBase Database · checked Sep 17, 2026
11Partial evidenceBellingham, WA, United StatesHQ checked Sep 17, 2026201-500460 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
12Indirect evidenceChicago, IL, United StatesHQ checked Sep 17, 2026201-500432 contacts →

Indirect evidence

“In 1979, Collins Engineers, Inc.”

Source: RevenueBase Database · checked Sep 17, 2026
13Partial evidenceSulphur, LA, United StatesHQ checked Sep 17, 2026501-1,000420 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
14Strong evidenceSeattle, WA, United StatesHQ checked Sep 17, 2026201-500404 contacts →

Strong evidence

“DCI Engineers has been providing client-focused structural and civil engineering services for over three decades.”

Source: RevenueBase Database · checked Sep 17, 2026
15Partial evidenceArlington, VA, United StatesHQ checked Sep 17, 2026201-500394 contacts →

Partial evidence

“Leidos Gibbs & Cox is an engineering and design firm specializing naval architecture, marine engineering, and consulting engineering.”

Source: RevenueBase Database · checked Sep 17, 2026
16Indirect evidenceSan Francisco, CA, United StatesHQ checked Sep 17, 2026201-500332 contacts →

Indirect evidence

“Founded in 1940, Degenkolb Engineers’ practice reflects more than eight decades of commitment to expertise, client service, and life-long learning.”

Source: RevenueBase Database · checked Sep 17, 2026
17Indirect evidenceHouston, TX, United StatesHQ checked Sep 17, 2026201-500310 contacts →

Indirect evidence

“We are A-Team of engineers specializing in the energy industry.”

Source: RevenueBase Database · checked Sep 17, 2026
18Partial evidenceHouma, LA, United StatesHQ checked Sep 17, 2026501-1,000305 contacts →

Partial evidence

“Performance Energy Services, a Danos company, was formed in to deliver safe, client-focused support to the onshore and offshore energy markets.”

Source: RevenueBase Database · checked Sep 17, 2026
19Indirect evidenceCoraopolis, PA, United StatesHQ checked Sep 17, 2026501-1,000281 contacts →

Indirect evidence

“American Bridge is a legendary construction company whose projects include a significant proportion of the world’s large bridges, marine installations, and other complex…”

Source: RevenueBase Database · checked Sep 17, 2026
20Partial evidencePensacola, FL, United StatesHQ checked Sep 17, 202651-200266 contacts →

Partial evidence

Offshore Inland Marine & Oilfield Services, Inc.(OIMO) corporate headquarters in Pensacola,FL provides a full range of Drilling Rig services and construction support activities…”

Source: RevenueBase Database · checked Sep 17, 2026
21Partial evidenceBoulder, CO, United StatesHQ checked Sep 17, 202651-200258 contacts →

Partial evidence

“JVA, Incorporated is an employee-owned consulting engineering firm with offices in Boulder, Fort Collins, Winter Park, Glenwood Springs, and Denver, Colorado.”

Source: RevenueBase Database · checked Sep 17, 2026
22Indirect evidenceHouston, TX, United StatesHQ checked Sep 17, 202651-200250 contacts →

Indirect evidence

“CTS - Complete Technical Services, Inc.”

Source: RevenueBase Database · checked Sep 17, 2026
23Partial evidenceMechanicsburg, PA, United StatesHQ checked Sep 17, 2026201-500241 contacts →

Partial evidence

“Modjeski and Masters is a nationwide leader in the design, inspection, and rehabilitation of all bridges types, including long-span and movable structures.”

Source: RevenueBase Database · checked Sep 17, 2026
24Partial evidenceWhite Bear Lake, MN, United StatesHQ checked Sep 17, 202651-200234 contacts →

Partial evidence

“Core Purpose: We use our passion for engineering to impact the world.”

Source: RevenueBase Database · checked Sep 17, 2026
25Partial evidenceHouston, TX, United StatesHQ checked Sep 17, 2026201-500207 contacts →

Partial evidence

“Delmar Systems is the trusted partners to most offshore energy industry’s leaders, delivering innovative and customer-focused anchoring and mooring solutions.”

Source: RevenueBase Database · checked Sep 17, 2026

Showing 25 of 2,041 offshore structural engineering firms based in the United States

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Offshore structural engineering firms based in the United States at a glance

As of Sep 17, 2026
33.8%Verified-email coverage
30.4Average contacts per company
1-10Median size (employees)
9.8%Largest-city concentration · Houston
Sep 17, 2026Page data refreshed

Companies by employee count

1-10
1,098
11-50
676
51-200
193
201-500
38
501-1,000
18
1,001-5,000
10
5,001-10,000
2
10001+
6

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 2,041 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 offshore structural 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 “offshore structural 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 offshore structural 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 offshore structural 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, 20,928 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.

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 offshore structural 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 offshore structural engineering firms are there based in the United States?

RevenueBase identified 2,041 offshore structural 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?

Mcdermott International, LTD, headquartered in Houston, tops this list with the largest team on record.

Which city has the most offshore structural engineering firms?

Houston leads with 200 headquartered companies, followed by New York (36) and Austin (28).

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 20,928 verified decision-maker contacts tracked across these 2,041 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.

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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.