Company lists · Data refreshed September 2026

Top 25 Offshore drilling vessel operators based in the United States

Name: Offshore drilling vessel operators based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 301 companies tracked

RevenueBase identified 301 offshore drilling vessel operators headquartered in the United States as of September 2026 and tracks 48,484 professional contacts across them, including 7,539 with verified work emails. Houston is the largest hub.

This list covers offshore drilling vessel operators 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 20, 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 20, 2026 86% judged on-target in blind review

301Companies

48,484Contacts tracked

7,539Verified emails

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The 25 largest offshore drilling vessel operators based in the United States

Ranked by team size

Top 25 of 301 offshore drilling vessel operators based in the United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to offshore drilling vessel operators: 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	Nabors Industries	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	10001+	5,865 contacts →
	Indirect evidence “Nabors Industries is a leading provider of advanced technology for the energy industry.” Source: RevenueBase Database · checked Sep 20, 2026
2	Noble Corporation	Strong evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	5,001-10,000	5,601 contacts →
	Strong evidence “Noble is a leading offshore drilling contractor for the oil and gas industry.” Source: RevenueBase Database · checked Sep 20, 2026
3	Tidewater	Strong evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	5,001-10,000	3,290 contacts →
	Strong evidence “Tidewater Inc.(Tidewater) is the owner and operator of the world’s largest Offshore Support Vessel (OSV) fleet.” Source: RevenueBase Database · checked Sep 20, 2026
4	Valaris Limited	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	5,001-10,000	3,173 contacts →
	Indirect evidence “We Are Valaris With decades of expertise and strategic commitment built on efficiency, capability and ingenuity, our sights are continually set toward a future built with purpose…” Source: RevenueBase Database · checked Sep 20, 2026
5	Helix Energy Solutions Group	Partial evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,706 contacts →
	Partial evidence “Helix Energy Solutions, headquartered in Houston, Texas, is an international offshore energy services company that provides specialty services to the offshore energy industry…” Source: RevenueBase Database · checked Sep 20, 2026
6	Hornbeck Offshore	Partial evidence	Covington, LA, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,418 contacts →
	Partial evidence “Hornbeck Offshore Services, Inc.” Source: RevenueBase Database · checked Sep 20, 2026
7	Atwood Oceanics	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	501-1,000	639 contacts →
	Indirect evidence “Atwood Oceanics, Inc.” Source: RevenueBase Database · checked Sep 20, 2026
8	Pacific Drilling	Partial evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	501-1,000	538 contacts →
	Partial evidence “On April 15, 2021, Noble Corporation plc completed its acquisition of Pacific Drilling Company LLC.” Source: RevenueBase Database · checked Sep 20, 2026
9	Kosmos Energy	Partial evidence	Dallas, TX, United StatesHQ checked Sep 20, 2026	201-500	444 contacts →
	Partial evidence “Kosmos Energy is a leading deepwater exploration and production company with assets in proven basins offshore Ghana, Equatorial Guinea and the U.S.” Source: RevenueBase Database · checked Sep 20, 2026
10	Cactus Drilling CO	Partial evidence	Oklahoma City, OK, United StatesHQ checked Sep 20, 2026	1,001-5,000	440 contacts →
	Partial evidence “As the largest privately-held domestic land drilling contractor in the United States, Cactus provides competent, motivated personnel utilizing premium equipment to meet and exceed…” Source: RevenueBase Database · checked Sep 20, 2026
11	Seacor Marine Holdings	Partial evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	501-1,000	404 contacts →
	Partial evidence “Fleet diversity to meet every offshore need.” Source: RevenueBase Database · checked Sep 20, 2026
12	Harvey Gulf International Marine	Strong evidence	New Orleans, LA, United StatesHQ checked Sep 20, 2026	501-1,000	400 contacts →
	Strong evidence “Harvey Gulf International Marine, LLC is a marine transportation company that specializes in providing Offshore Supply and Multi-Purpose Support Vessels for deepwater operations…” Source: RevenueBase Database · checked Sep 20, 2026
13	Resolve Marine	Partial evidence	Fort Lauderdale, FL, United StatesHQ checked Sep 20, 2026	51-200	277 contacts →
	Partial evidence “Resolve Marine, a global leader in vessel salvage, emergency response, compliance and specialized marine services, has served and supported clients and projects for 40 years.” Source: RevenueBase Database · checked Sep 20, 2026
14	Crosby Energy Services	Indirect evidence	Cut Off, LA, United StatesHQ checked Sep 20, 2026	201-500	272 contacts →
	Indirect evidence “Founded as C&D Wireline in 1968, with C&D Production Specialist joining the business in 1993, today Crosby Energy Services is a certified Women’s Business Enterprise National…” Source: RevenueBase Database · checked Sep 20, 2026
15	Offshore Inland Marine & Oilfield Services, INC	Strong evidence	Pensacola, FL, United StatesHQ checked Sep 20, 2026	51-200	266 contacts →
	Strong 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 20, 2026
16	Trendsetter Engineering, INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	201-500	259 contacts →
	Indirect evidence “Trendsetter is a global provider of specialized subsea solutions to the oil and gas industry's toughest challenges.” Source: RevenueBase Database · checked Sep 20, 2026
17	Exmar Offshore Company	Partial evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	51-200	226 contacts →
	Partial evidence “Exmar Offshore Group Houston is the American branch of Exmar (Euronext: EXM), a descendant of the Compagnie Maritime Belge (Euronext: CMB) maritime group founded in 1895 in…” Source: RevenueBase Database · checked Sep 20, 2026
18	Delmar Systems	Partial evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	201-500	207 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 20, 2026
19	Patterson-Uti Drilling	Partial evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	1,001-5,000	205 contacts →
	Partial evidence “Drill smarter and faster with Patterson-UTI Drilling’s comprehensive fleet of pad-capable rigs featuring advanced walking systems to enhance your operations so you can reach your…” Source: RevenueBase Database · checked Sep 20, 2026
20	Enterprise Offshore Drilling	Strong evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	501-1,000	185 contacts →
	Strong evidence “The People Company" Enterprise Offshore Drilling was formed in January of 2017 - A privately owned limited liability company with headquarters in Houston, TX.” Source: RevenueBase Database · checked Sep 20, 2026
21	Otto Candies, LLC	Partial evidence	Des Allemands, LA, United StatesHQ checked Sep 20, 2026	201-500	158 contacts →
	Partial evidence “Otto Candies, LLC is a maritime transportation and support service company specializing in regional, national, and international operations in support of the offshore energy…” Source: RevenueBase Database · checked Sep 20, 2026
22	PRT Offshore An Expro Company	Partial evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	51-200	155 contacts →
	Partial evidence “PRT Offshore, an Expro company, provides high-quality oilfield rental equipment and services for the global offshore industry.” Source: RevenueBase Database · checked Sep 20, 2026
23	Loadmaster Industries	Indirect evidence	Broussard, LA, United StatesHQ checked Sep 20, 2026	51-200	146 contacts →
	Indirect evidence “Loadmaster Industries is a diversified manufacturing, engineering, design, and field services company with 30 years of experience in the global energy and industrial markets.” Source: RevenueBase Database · checked Sep 20, 2026
24	Scandrill INC	Indirect evidence	Tyler, TX, United StatesHQ checked Sep 20, 2026	201-500	133 contacts →
	Indirect evidence “SCANDRILL, INC.” Source: RevenueBase Database · checked Sep 20, 2026
25	Petrolog Group	Indirect evidence	Houston, United StatesHQ checked Sep 20, 2026	501-1,000	131 contacts →
	Indirect evidence “Petrolog brings energy to the world as an integrated provider of solutions for the entire oil and gas lifecycle.” Source: RevenueBase Database · checked Sep 20, 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: offshore drilling vessel operators. 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 offshore drilling vessel operators.
Partial evidence: Its own public description names part of offshore drilling vessel operators, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name offshore drilling vessel operators. 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 301 offshore drilling vessel operators based in the United States

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Offshore drilling vessel operators based in the United States at a glance

As of Sep 20, 2026

15.5%Verified-email coverage

161.1Average contacts per company

11-50Median size (employees)

29.6%Largest-city concentration · Houston

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

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 301 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 drilling vessel operators, 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 drilling vessel operators”. 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 drilling vessel operators), 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 drilling vessel operators, 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, 7,539 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 20, 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.

Offshore drilling vessel operators by metro

Offshore drilling vessel operators in Houston89

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 drilling vessel operators, 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 drilling vessel operators are there based in the United States?

RevenueBase identified 301 offshore drilling vessel operators 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?

Nabors Industries, headquartered in Houston, tops this list with the largest team on record.

Which city has the most offshore drilling vessel operators?

Houston leads with 89 headquartered companies, followed by Houma (12) and Broussard (8).

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 7,539 verified decision-maker contacts tracked across these 301 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 20, 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.