Company lists · Data refreshed September 2026
Top 25 Marine and subsea consulting firms based in the United States
RevenueBase identified 2,325 company matches for marine and subsea consulting firms associated with the United States as of September 2026 and tracks 123,646 professional contacts across them, including 49,214 with verified work emails. Houston is the largest hub.
This list covers company matches for marine and subsea consulting 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 28, 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.
The 25 largest marine and subsea consulting firms based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 12,999 contacts → | ||||
Exact match “Tetra Tech is the leader in water, environment and sustainable infrastructure, providing high-end technical and engineering services for projects worldwide.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase | |||||
| 2 | 12,031 contacts → | ||||
Exact match “Oceaneering is a global technology company delivering engineered services and products and robotic solutions to the offshore energy, defense, aerospace, and manufacturing…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase | |||||
| 3 | 6,113 contacts → | ||||
Exact match “Terracon is a 100 percent employee-owned consulting engineering firm providing quality services to clients.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase | |||||
| 4 | 2,473 contacts → | ||||
Exact match “Headquartered in Walnut Creek, Calif, Brown and Caldwell is an employee-owned firm with 2,100+ professionals serving clients locally and globally from 52 locations.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase | |||||
| 5 | 2,393 contacts → | ||||
Exact match “Geosyntec is a consulting and engineering firm that works with private and public sector clients to address new ventures and complex problems involving our environment, natural…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase | |||||
| 6 | 2,232 contacts → | ||||
Exact match “Providence is an employee-owned engineering and environmental consulting firm.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase | |||||
| 7 | 2,210 contacts → | ||||
Exact match “ECS Group of Companies is a Chantilly, VA-based consulting engineering firm.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase | |||||
| 8 | 2,108 contacts → | ||||
Exact match “Olsson is an engineering firm made up of people who craft expert solutions and designs that improve communities.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase | |||||
| 9 | 1,706 contacts → | ||||
Exact match “Helix Energy Solutions, headquartered in Houston, Texas, is an international offshore energy services company that provides specialty services to the offshore energy industry…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase | |||||
| 10 | 1,604 contacts → | ||||
Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase | |||||
| 11 | 1,595 contacts → | ||||
Exact match “UES provides professional engineering, environmental, testing and inspection services to clients across the United States.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase | |||||
| 12 | 1,560 contacts → | ||||
Exact match “In an era of accelerating change, Exponent is the only premium engineering and scientific consulting firm with the depth and breadth of expertise to solve our clients’ most…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase | |||||
| 13 | 1,441 contacts → | ||||
Exact match “Weston Solutions, Inc.(Weston) is a 100% employee-owned environmental and infrastructure services firm committed to safety and providing measurable client value.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase | |||||
| 14 | 1,358 contacts → | ||||
Exact match “Partner Assessment Corp.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase | |||||
| 15 | 1,231 contacts → | ||||
Exact match “Knight Piésold is an employee-owned, global consulting firm providing specialist services to the mining, power, water resources, and infrastructure industries.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase | |||||
| 16 | 1,178 contacts → | ||||
Exact match “Moffatt & Nichol is a leading U.S-based global infrastructure advisor specializing in the planning and design of facilities that shape and serve our coastlines, harbors and…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase | |||||
| 17 | 1,137 contacts → | ||||
Exact match “Who is Apex?” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase | |||||
| 18 | 1,124 contacts → | ||||
Exact match “Haley & Aldrich is committed to solving our clients’ most meaningful challenges in the built and natural environments.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase | |||||
| 19 | 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 28, 2026 · View company records in RevenueBase | |||||
| 20 | 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 28, 2026 · View company records in RevenueBase | |||||
| 21 | 961 contacts → | ||||
Exact match “Trinity Consultants is a global team of experts helping organizations solve complex challenges in environmental compliance, ecological protection, infrastructure performance, and…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase | |||||
| 22 | 880 contacts → | ||||
Exact match “Founded in 1964 as a soils and foundations specialty consultant, GZA GeoEnvironmental, Inc.(GZA) has grown into a full-service company providing its clients with highly…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase | |||||
| 23 | 875 contacts → | ||||
Exact match “ABSG Consulting Inc.(ABS Consulting) is part of ABS Group of Companies, a global leader in safety and risk management for critical infrastructure worldwide and a wholly owned…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase | |||||
| 24 | 865 contacts → | ||||
Exact match “ATC Group Services LLC is now Atlas.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase | |||||
| 25 | 847 contacts → | ||||
Exact match “Founded in 1919, Weeks Marine, Inc.” Recorded in the RevenueBase company graph · Sep 28, 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 “marine and subsea consulting 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 2,325 marine and subsea consulting firms based in the United States
See the full list, filter by size, metro and specialty, and access 49,214 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Marine and subsea consulting firms based in the United States at a glance
As of Sep 28, 2026Companies by employee count
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 2,325 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 “marine and subsea consulting 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 49,214 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 28, 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.
Marine and subsea consulting 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 “marine and subsea consulting firms”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many marine and subsea consulting firms are there based in the United States?
RevenueBase identified 2,325 company matches for marine and subsea consulting 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?
Tetra Tech tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which city has the most marine and subsea consulting firms?
Houston leads with 286 company records, followed by Seattle (44) and Miami (37).
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 49,214 professional contacts with verified work emails tracked across these 2,325 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 28, 2026.
Ready to reach these companies? Verified emails and direct dials for all 2,325 marine and subsea consulting firms based in the United States. Start with a free account, no credit card.
Download this list →Related lists
Marine and subsea consulting firms by geography
- Marine and subsea consulting firms based in Brisbane, Australia
- Marine and subsea consulting firms based in Melbourne, Australia
- Marine and subsea consulting firms based in Perth, Australia
- Marine and subsea consulting firms based in Sydney, Australia
- Marine and subsea consulting firms based in Belo Horizonte, Brazil
- Marine and subsea consulting firms based in Curitiba, Brazil
- Marine and subsea consulting firms based in Rio De Janeiro, Brazil
- Marine and subsea consulting firms based in Sao Paulo, Brazil
- Marine and subsea consulting firms based in Calgary, Canada
- Marine and subsea consulting firms based in Edmonton, Canada
- Marine and subsea consulting firms based in Toronto, Canada
- Marine and subsea consulting firms based in Vancouver, Canada
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.
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Marine and subsea consulting firms based in Brisbane, Australia
- Marine and subsea consulting firms based in Melbourne, Australia
- Marine and subsea consulting firms based in Perth, Australia
- Marine and subsea consulting firms based in Sydney, Australia
- Marine and subsea consulting firms based in Belo Horizonte, Brazil
- Marine and subsea consulting firms based in Curitiba, Brazil
Company intelligence · public preview
Top 25 marine and subsea consulting firms based in the United States
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 2,325 matching company records for marine and subsea consulting firms based in the United States, with 123,646 tracked contacts and 49,214 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 28, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 marine and subsea consulting firms based in the United States
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 |  Tetra Techtetratech.comHQ: Pasadena, CA, United StatesReported employees: 10001+ | Pasadena, CA, United States | 10001+ | Exact match | 12,999 contacts → |
“Tetra Tech is the leader in water, environment and sustainable infrastructure, providing high-end technical and engineering services for projects worldwide.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  Oceaneeringoceaneering.comHQ: Houston, TX, United StatesReported employees: 10001+ | Houston, TX, United States | 10001+ | Exact match | 12,031 contacts → |
“Oceaneering is a global technology company delivering engineered services and products and robotic solutions to the offshore energy, defense, aerospace, and manufacturing…” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  Terraconterracon.comHQ: Olathe, KS, United StatesReported employees: 5,001-10,000 | Olathe, KS, United States | 5,001-10,000 | Exact match | 6,113 contacts → |
“Terracon is a 100 percent employee-owned consulting engineering firm providing quality services to clients.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  Brown And Caldwellbrownandcaldwell.comHQ: Walnut Creek, CA, United StatesReported employees: 1,001-5,000 | Walnut Creek, CA, United States | 1,001-5,000 | Exact match | 2,473 contacts → |
“Headquartered in Walnut Creek, Calif, Brown and Caldwell is an employee-owned firm with 2,100+ professionals serving clients locally and globally from 52 locations.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 |  Geosyntec Consultantsgeosyntec.comHQ: Boca Raton, FL, United StatesReported employees: 1,001-5,000 | Boca Raton, FL, United States | 1,001-5,000 | Exact match | 2,393 contacts → |
“Geosyntec is a consulting and engineering firm that works with private and public sector clients to address new ventures and complex problems involving our environment, natural…” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  Providenceprovidenceeng.comHQ: Baton Rouge, LA, United StatesReported employees: Not recorded | Baton Rouge, LA, United States | Not recorded | Exact match | 2,232 contacts → |
“Providence is an employee-owned engineering and environmental consulting firm.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  ECS Group Of Companiesecslimited.comHQ: Chantilly, VA, United StatesReported employees: 1,001-5,000 | Chantilly, VA, United States | 1,001-5,000 | Exact match | 2,210 contacts → |
“ECS Group of Companies is a Chantilly, VA-based consulting engineering firm.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  Olssonolsson.comHQ: Lincoln, NE, United StatesReported employees: 1,001-5,000 | Lincoln, NE, United States | 1,001-5,000 | Exact match | 2,108 contacts → |
“Olsson is an engineering firm made up of people who craft expert solutions and designs that improve communities.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  Helix Energy Solutions Grouphelixesg.comHQ: Houston, TX, United StatesReported employees: 1,001-5,000 | Houston, TX, United States | 1,001-5,000 | Exact match | 1,706 contacts → |
“Helix Energy Solutions, headquartered in Houston, Texas, is an international offshore energy services company that provides specialty services to the offshore energy industry…” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  GEI Consultants, INCgeiconsultants.comHQ: Woburn, MA, United StatesReported employees: 1,001-5,000 | Woburn, MA, United States | 1,001-5,000 | Exact match | 1,604 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 11 |  UESteamues.comHQ: Orlando, FL, United StatesReported employees: 1,001-5,000 | Orlando, FL, United States | 1,001-5,000 | Exact match | 1,595 contacts → |
“UES provides professional engineering, environmental, testing and inspection services to clients across the United States.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  Exponentexponent.comHQ: Menlo Park, CA, United StatesReported employees: 1,001-5,000 | Menlo Park, CA, United States | 1,001-5,000 | Exact match | 1,560 contacts → |
“In an era of accelerating change, Exponent is the only premium engineering and scientific consulting firm with the depth and breadth of expertise to solve our clients’ most…” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Weston Solutions, INCwestonsolutions.com HQ: West Chester, PA, United StatesReported employees: 1,001-5,000 | West Chester, PA, United States | 1,001-5,000 | Exact match | 1,441 contacts → |
“Weston Solutions, Inc.(Weston) is a 100% employee-owned environmental and infrastructure services firm committed to safety and providing measurable client value.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  Partner Engineering & Science, INCpartneresi.comHQ: Torrance, CA, United StatesReported employees: 1,001-5,000 | Torrance, CA, United States | 1,001-5,000 | Exact match | 1,358 contacts → |
“Partner Assessment Corp.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  Knight Piesoldknightpiesold.comHQ: Denver, CO, United StatesReported employees: 1,001-5,000 | Denver, CO, United States | 1,001-5,000 | Exact match | 1,231 contacts → |
“Knight Piésold is an employee-owned, global consulting firm providing specialist services to the mining, power, water resources, and infrastructure industries.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  Moffatt & Nicholmoffattnichol.comHQ: Long Beach, CA, United StatesReported employees: 1,001-5,000 | Long Beach, CA, United States | 1,001-5,000 | Exact match | 1,178 contacts → |
“Moffatt & Nichol is a leading U.S-based global infrastructure advisor specializing in the planning and design of facilities that shape and serve our coastlines, harbors and…” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 |  Apex Companiesapexcos.comHQ: Rockville, MD, United StatesReported employees: 1,001-5,000 | Rockville, MD, United States | 1,001-5,000 | Exact match | 1,137 contacts → |
“Who is Apex?” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  Haley & Aldrichhaleyaldrich.comHQ: Burlington, MA, United StatesReported employees: 501-1,000 | Burlington, MA, United States | 501-1,000 | Exact match | 1,124 contacts → |
“Haley & Aldrich is committed to solving our clients’ most meaningful challenges in the built and natural environments.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  Barr Engineering CObarr.comHQ: Minneapolis, MN, United StatesReported employees: 1,001-5,000 | Minneapolis, MN, United States | 1,001-5,000 | Exact match | 1,088 contacts → |
“Barr provides engineering and environmental consulting services to clients across the Midwest, throughout the Americas, and around the world.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 |  Gulf Companiesgulfcompanies.comHQ: Houston, TX, United StatesReported employees: 1,001-5,000 | Houston, TX, United States | 1,001-5,000 | Exact match | 1,046 contacts → |
“At Gulf Companies, we are driven by our mission to serve a vital role in the global energy industry.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 |  Trinity Consultantstrinityconsultants.comHQ: Dallas, TX, United StatesReported employees: 1,001-5,000 | Dallas, TX, United States | 1,001-5,000 | Exact match | 961 contacts → |
“Trinity Consultants is a global team of experts helping organizations solve complex challenges in environmental compliance, ecological protection, infrastructure performance, and…” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  GZA Geoenvironmental, INCgza.comHQ: Norwood, MA, United StatesReported employees: 501-1,000 | Norwood, MA, United States | 501-1,000 | Exact match | 880 contacts → |
“Founded in 1964 as a soils and foundations specialty consultant, GZA GeoEnvironmental, Inc.(GZA) has grown into a full-service company providing its clients with highly…” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 |  ABS Consultingabs-group.comHQ: Spring, TX, United StatesReported employees: 1,001-5,000 | Spring, TX, United States | 1,001-5,000 | Exact match | 875 contacts → |
“ABSG Consulting Inc.(ABS Consulting) is part of ABS Group of Companies, a global leader in safety and risk management for critical infrastructure worldwide and a wholly owned…” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 |  ATC Group Services LLConeatlas.comHQ: Lafayette, LA, United StatesReported employees: 1,001-5,000 | Lafayette, LA, United States | 1,001-5,000 | Exact match | 865 contacts → |
“ATC Group Services LLC is now Atlas.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | Weeks Marine, INCweeksmarine.com HQ: Cranford, NJ, United StatesReported employees: 1,001-5,000 | Cranford, NJ, United States | 1,001-5,000 | Exact match | 847 contacts → |
“Founded in 1919, Weeks Marine, Inc.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 2,325 company matches
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Marine and subsea consulting firms: dataset insights
September 28, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
2,320 records in the displayed employee bands.
5 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
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 2,325 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 28, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Marine and subsea consulting firms by metro
Questions about this company list
What does Exact match mean for marine and subsea consulting firms?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many marine and subsea consulting firms did RevenueBase find based in the United States?
The saved snapshot records 2,325 matching company records, 123,646 tracked contacts and 49,214 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 28, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
Marine and subsea consulting firms by geography
- Marine and subsea consulting firms based in Brisbane, Australia
- Marine and subsea consulting firms based in Melbourne, Australia
- Marine and subsea consulting firms based in Perth, Australia
- Marine and subsea consulting firms based in Sydney, Australia
- Marine and subsea consulting firms based in Belo Horizonte, Brazil
- Marine and subsea consulting firms based in Curitiba, Brazil
- Marine and subsea consulting firms based in Rio De Janeiro, Brazil
- Marine and subsea consulting firms based in Sao Paulo, Brazil
- Marine and subsea consulting firms based in Calgary, Canada
- Marine and subsea consulting firms based in Edmonton, Canada
- Marine and subsea consulting firms based in Toronto, Canada
- Marine and subsea consulting firms based in Vancouver, Canada
Cite this list
RevenueBase Data Team. Top 25 marine and subsea consulting firms based in the United States. Snapshot: September 28, 2026. https://revenuebase.ai/companies/marine-and-subsea-consulting-firms/united-states.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Marine and subsea consulting firms based in Brisbane, Australia
- Marine and subsea consulting firms based in Melbourne, Australia
- Marine and subsea consulting firms based in Perth, Australia
- Marine and subsea consulting firms based in Sydney, Australia
- Marine and subsea consulting firms based in Belo Horizonte, Brazil
- Marine and subsea consulting firms based in Curitiba, Brazil
Company intelligence · public preview
Top 25 marine and subsea consulting firms based in the United States
RevenueBase records 2,325 matching company records for marine and subsea consulting firms based in the United States, with 123,646 tracked contacts and 49,214 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 28, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 marine and subsea consulting firms based in the United States
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 | Tetra Techtetratech.com HQ: Pasadena, CA, United StatesReported employees: 10001+ | Pasadena, CA, United States | 10001+ | Exact match | 12,999 contacts → |
“Tetra Tech is the leader in water, environment and sustainable infrastructure, providing high-end technical and engineering services for projects worldwide.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Oceaneeringoceaneering.com HQ: Houston, TX, United StatesReported employees: 10001+ | Houston, TX, United States | 10001+ | Exact match | 12,031 contacts → |
“Oceaneering is a global technology company delivering engineered services and products and robotic solutions to the offshore energy, defense, aerospace, and manufacturing…” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | Terraconterracon.com HQ: Olathe, KS, United StatesReported employees: 5,001-10,000 | Olathe, KS, United States | 5,001-10,000 | Exact match | 6,113 contacts → |
“Terracon is a 100 percent employee-owned consulting engineering firm providing quality services to clients.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | Brown And Caldwellbrownandcaldwell.com HQ: Walnut Creek, CA, United StatesReported employees: 1,001-5,000 | Walnut Creek, CA, United States | 1,001-5,000 | Exact match | 2,473 contacts → |
“Headquartered in Walnut Creek, Calif, Brown and Caldwell is an employee-owned firm with 2,100+ professionals serving clients locally and globally from 52 locations.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Geosyntec Consultantsgeosyntec.com HQ: Boca Raton, FL, United StatesReported employees: 1,001-5,000 | Boca Raton, FL, United States | 1,001-5,000 | Exact match | 2,393 contacts → |
“Geosyntec is a consulting and engineering firm that works with private and public sector clients to address new ventures and complex problems involving our environment, natural…” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | Providenceprovidenceeng.com HQ: Baton Rouge, LA, United StatesReported employees: Not recorded | Baton Rouge, LA, United States | Not recorded | Exact match | 2,232 contacts → |
“Providence is an employee-owned engineering and environmental consulting firm.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | ECS Group Of Companiesecslimited.com HQ: Chantilly, VA, United StatesReported employees: 1,001-5,000 | Chantilly, VA, United States | 1,001-5,000 | Exact match | 2,210 contacts → |
“ECS Group of Companies is a Chantilly, VA-based consulting engineering firm.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Olssonolsson.com HQ: Lincoln, NE, United StatesReported employees: 1,001-5,000 | Lincoln, NE, United States | 1,001-5,000 | Exact match | 2,108 contacts → |
“Olsson is an engineering firm made up of people who craft expert solutions and designs that improve communities.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Helix Energy Solutions Grouphelixesg.com HQ: Houston, TX, United StatesReported employees: 1,001-5,000 | Houston, TX, United States | 1,001-5,000 | Exact match | 1,706 contacts → |
“Helix Energy Solutions, headquartered in Houston, Texas, is an international offshore energy services company that provides specialty services to the offshore energy industry…” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | GEI Consultants, INCgeiconsultants.com HQ: Woburn, MA, United StatesReported employees: 1,001-5,000 | Woburn, MA, United States | 1,001-5,000 | Exact match | 1,604 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 11 | UESteamues.com HQ: Orlando, FL, United StatesReported employees: 1,001-5,000 | Orlando, FL, United States | 1,001-5,000 | Exact match | 1,595 contacts → |
“UES provides professional engineering, environmental, testing and inspection services to clients across the United States.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Exponentexponent.com HQ: Menlo Park, CA, United StatesReported employees: 1,001-5,000 | Menlo Park, CA, United States | 1,001-5,000 | Exact match | 1,560 contacts → |
“In an era of accelerating change, Exponent is the only premium engineering and scientific consulting firm with the depth and breadth of expertise to solve our clients’ most…” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Weston Solutions, INCwestonsolutions.com HQ: West Chester, PA, United StatesReported employees: 1,001-5,000 | West Chester, PA, United States | 1,001-5,000 | Exact match | 1,441 contacts → |
“Weston Solutions, Inc.(Weston) is a 100% employee-owned environmental and infrastructure services firm committed to safety and providing measurable client value.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Partner Engineering & Science, INCpartneresi.com HQ: Torrance, CA, United StatesReported employees: 1,001-5,000 | Torrance, CA, United States | 1,001-5,000 | Exact match | 1,358 contacts → |
“Partner Assessment Corp.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Knight Piesoldknightpiesold.com HQ: Denver, CO, United StatesReported employees: 1,001-5,000 | Denver, CO, United States | 1,001-5,000 | Exact match | 1,231 contacts → |
“Knight Piésold is an employee-owned, global consulting firm providing specialist services to the mining, power, water resources, and infrastructure industries.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Moffatt & Nicholmoffattnichol.com HQ: Long Beach, CA, United StatesReported employees: 1,001-5,000 | Long Beach, CA, United States | 1,001-5,000 | Exact match | 1,178 contacts → |
“Moffatt & Nichol is a leading U.S-based global infrastructure advisor specializing in the planning and design of facilities that shape and serve our coastlines, harbors and…” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Apex Companiesapexcos.com HQ: Rockville, MD, United StatesReported employees: 1,001-5,000 | Rockville, MD, United States | 1,001-5,000 | Exact match | 1,137 contacts → |
“Who is Apex?” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Haley & Aldrichhaleyaldrich.com HQ: Burlington, MA, United StatesReported employees: 501-1,000 | Burlington, MA, United States | 501-1,000 | Exact match | 1,124 contacts → |
“Haley & Aldrich is committed to solving our clients’ most meaningful challenges in the built and natural environments.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | Barr Engineering CObarr.com HQ: Minneapolis, MN, United StatesReported employees: 1,001-5,000 | Minneapolis, MN, United States | 1,001-5,000 | Exact match | 1,088 contacts → |
“Barr provides engineering and environmental consulting services to clients across the Midwest, throughout the Americas, and around the world.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | Gulf Companiesgulfcompanies.com HQ: Houston, TX, United StatesReported employees: 1,001-5,000 | Houston, TX, United States | 1,001-5,000 | Exact match | 1,046 contacts → |
“At Gulf Companies, we are driven by our mission to serve a vital role in the global energy industry.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Trinity Consultantstrinityconsultants.com HQ: Dallas, TX, United StatesReported employees: 1,001-5,000 | Dallas, TX, United States | 1,001-5,000 | Exact match | 961 contacts → |
“Trinity Consultants is a global team of experts helping organizations solve complex challenges in environmental compliance, ecological protection, infrastructure performance, and…” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | GZA Geoenvironmental, INCgza.com HQ: Norwood, MA, United StatesReported employees: 501-1,000 | Norwood, MA, United States | 501-1,000 | Exact match | 880 contacts → |
“Founded in 1964 as a soils and foundations specialty consultant, GZA GeoEnvironmental, Inc.(GZA) has grown into a full-service company providing its clients with highly…” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | ABS Consultingabs-group.com HQ: Spring, TX, United StatesReported employees: 1,001-5,000 | Spring, TX, United States | 1,001-5,000 | Exact match | 875 contacts → |
“ABSG Consulting Inc.(ABS Consulting) is part of ABS Group of Companies, a global leader in safety and risk management for critical infrastructure worldwide and a wholly owned…” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | ATC Group Services LLConeatlas.com HQ: Lafayette, LA, United StatesReported employees: 1,001-5,000 | Lafayette, LA, United States | 1,001-5,000 | Exact match | 865 contacts → |
“ATC Group Services LLC is now Atlas.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | Weeks Marine, INCweeksmarine.com HQ: Cranford, NJ, United StatesReported employees: 1,001-5,000 | Cranford, NJ, United States | 1,001-5,000 | Exact match | 847 contacts → |
“Founded in 1919, Weeks Marine, Inc.” Recorded description excerpt · September 28, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 2,325 company matches
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Marine and subsea consulting firms: dataset insights
September 28, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
2,320 records in the displayed employee bands.
5 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
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 2,325 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 28, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Marine and subsea consulting firms by metro
Questions about this company list
What does Exact match mean for marine and subsea consulting firms?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many marine and subsea consulting firms did RevenueBase find based in the United States?
The saved snapshot records 2,325 matching company records, 123,646 tracked contacts and 49,214 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 28, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
Marine and subsea consulting firms by geography
- Marine and subsea consulting firms based in Brisbane, Australia
- Marine and subsea consulting firms based in Melbourne, Australia
- Marine and subsea consulting firms based in Perth, Australia
- Marine and subsea consulting firms based in Sydney, Australia
- Marine and subsea consulting firms based in Belo Horizonte, Brazil
- Marine and subsea consulting firms based in Curitiba, Brazil
- Marine and subsea consulting firms based in Rio De Janeiro, Brazil
- Marine and subsea consulting firms based in Sao Paulo, Brazil
- Marine and subsea consulting firms based in Calgary, Canada
- Marine and subsea consulting firms based in Edmonton, Canada
- Marine and subsea consulting firms based in Toronto, Canada
- Marine and subsea consulting firms based in Vancouver, Canada
Cite this list
RevenueBase Data Team. Top 25 marine and subsea consulting firms based in the United States. Snapshot: September 28, 2026. https://revenuebase.ai/companies/marine-and-subsea-consulting-firms/united-states.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
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