Company lists · Data refreshed September 2026

Top 25 Slant hole drilling companies based in the United States

Name: Slant hole drilling companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 306 companies tracked

RevenueBase identified 306 slant hole drilling companies headquartered in the United States as of September 2026 and tracks 9,109 professional contacts across them, including 2,354 with verified work emails. Houston is the largest hub.

This list covers slant hole drilling companies 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 22, 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 22, 2026 86% judged on-target in blind review

306Companies

9,109Contacts tracked

2,354Verified emails

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The 25 largest slant hole drilling companies based in the United States

Ranked by team size

Top 25 of 306 slant hole drilling companies based in the United States, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to slant hole drilling companies: 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	Boart Longyear	Partial evidence	West Valley City, UT, United StatesHQ checked Sep 22, 2026	5,001-10,000	3,285 contacts →
	Partial evidence “Established in 1890, Boart Longyear is the world’s leading innovative provider of drilling services, manufacturer of productivity-driven drilling equipment and performance…” Source: RevenueBase Database · checked Sep 22, 2026
2	Scientific Drilling	Partial evidence	The Woodlands, TX, United StatesHQ checked Sep 22, 2026	1,001-5,000	1,134 contacts →
	Partial evidence “THE ULTIMATE PARTNER IN WELLBORE PLACEMENT Scientific Drilling International is an independent service provider offering a complete high accuracy wellbore placement and drilling…” Source: RevenueBase Database · checked Sep 22, 2026
3	Cactus Drilling CO	Partial evidence	Oklahoma City, OK, United StatesHQ checked Sep 22, 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 22, 2026
4	Total Directional Services, LLC	Indirect evidence	Windsor, CO, United StatesHQ checked Sep 22, 2026	51-200	313 contacts →
	Indirect evidence “Total Directional Services, LLC is a privately owned, managed and operated service company headquartered in Windsor, CO.” Source: RevenueBase Database · checked Sep 22, 2026
5	Leam Drilling Services	Partial evidence	New Iberia, LA, United StatesHQ checked Sep 22, 2026	501-1,000	291 contacts →
	Partial evidence “LEAM Drilling Systems, Inc.” Source: RevenueBase Database · checked Sep 22, 2026
6	Altitude Energy Partners	Partial evidence	The Woodlands, TX, United StatesHQ checked Sep 22, 2026	51-200	288 contacts →
	Partial evidence “Altitude Energy Partners (AEP) provides trusted expertise in Directional Drilling.” Source: RevenueBase Database · checked Sep 22, 2026
7	MS Directional	Partial evidence	Conroe, TX, United StatesHQ checked Sep 22, 2026	501-1,000	215 contacts →
	Partial evidence “For more than 30 years, MS Directional, a Patterson-UTI company, has led the way in directional drilling services across North America.” Source: RevenueBase Database · checked Sep 22, 2026
8	National EWP	Partial evidence	Elko, NV, United StatesHQ checked Sep 22, 2026	201-500	146 contacts →
	Partial evidence “National provides mining companies primarily working in the Western United States with the safest, most competitive drilling services in the industry.” Source: RevenueBase Database · checked Sep 22, 2026
9	Nomac Drilling	Partial evidence	El Reno, OK, United StatesHQ checked Sep 22, 2026	1,001-5,000	134 contacts →
	Partial evidence “Nomac Drilling is now Patterson-UTI.” Source: RevenueBase Database · checked Sep 22, 2026
10	Geoprobe Systems	Partial evidence	Salina, KS, United StatesHQ checked Sep 22, 2026	51-200	107 contacts →
	Partial evidence “Geoprobe® Manufactures Powerful, Compact Machines & Tooling that Provide Direct Push, Rotary, & Sonic Drilling Capabilities to the Environmental, Geotechnical, Geothermal, &…” Source: RevenueBase Database · checked Sep 22, 2026
11	Redpath USA Corporation	Indirect evidence	Sparks, NV, United StatesHQ checked Sep 22, 2026	201-500	87 contacts →
	Indirect evidence “Redpath USA Corporation is a full-service underground mining contractor.” Source: RevenueBase Database · checked Sep 22, 2026
12	K&m Technology Group	Partial evidence	The Woodlands, TX, United StatesHQ checked Sep 22, 2026	51-200	85 contacts →
	Partial evidence “K&M Technology Group was founded in 1988 and has been involved in extended reach and horizontal drilling since its inception.” Source: RevenueBase Database · checked Sep 22, 2026
13	Hole Products	Strong evidence	Little Falls, MN, United StatesHQ checked Sep 22, 2026	51-200	83 contacts →
	Strong evidence “Hole Products is a leading manufacturer and supplier of high performance drilling supplies, tools and equipment to the construction, direct push, environmental, geotechnical…” Source: RevenueBase Database · checked Sep 22, 2026
14	Shaft Drillers International	Indirect evidence	Mt Morris, PA, United StatesHQ checked Sep 22, 2026	1,001-5,000	78 contacts →
	Indirect evidence “Shaft Drillers International LLC Headquartered in Mt.” Source: RevenueBase Database · checked Sep 22, 2026
15	Timberline Drilling, INC	Partial evidence	Elko, NV, United StatesHQ checked Sep 22, 2026	201-500	77 contacts →
	Partial evidence “With more than 7.4 million feet drilled in the past seven years, Timberline Drilling has a proven track records in safety and production.” Source: RevenueBase Database · checked Sep 22, 2026
16	MES Mining	Indirect evidence	Sandy, UT, United StatesHQ checked Sep 22, 2026	11-50	77 contacts →
	Indirect evidence “Mining & Environmental Services LLC provides specialized technical expertise, at a high level of excellence, to support our Clients throughout the full process cycle of…” Source: RevenueBase Database · checked Sep 22, 2026
17	Wesco Western Explosives Systems Company	Partial evidence	Salt Lake City, United StatesHQ checked Sep 22, 2026	51-200	61 contacts →
	Partial evidence “WESCO provides rock drilling and blasting solutions to businesses in the construction and mining industries throughout the western United States.” Source: RevenueBase Database · checked Sep 22, 2026
18	Mobile Drill Intl	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 22, 2026	11-50	42 contacts →
	Indirect evidence “Mobile Drill Intl manufactures a full line of drill rigs and tooling servicing the Geotechnical, Environmental, Mineral Exploration, Water Well and Seismic industries.” Source: RevenueBase Database · checked Sep 22, 2026
19	Inrock	Partial evidence	Houston, TX, United StatesHQ checked Sep 22, 2026	51-200	41 contacts →
	Partial evidence “INROCK® is the HDD industry-recognized global leader in performance drilling tools, equipment and services with Sales and Operations facilities in the USA, UK, Canada and Latin…” Source: RevenueBase Database · checked Sep 22, 2026
20	Noram Drilling Company	Partial evidence	Houston, TX, United StatesHQ checked Sep 22, 2026	201-500	34 contacts →
	Partial evidence “NORAM DRILLING COMPANY is an oil & energy company based out of Houston, TX and located at 8400 N Sam Houston Pkwy W, Suite 120, Houston, Texas, 77064, United States.” Source: RevenueBase Database · checked Sep 22, 2026
21	Alford Drilling, LLC	Partial evidence	Elko, NV, United StatesHQ checked Sep 22, 2026	11-50	33 contacts →
	Partial evidence “Alford Drilling, LLC is a new drilling company based in Elko, Nevada, offering diamond core and reverse circulation drilling services.” Source: RevenueBase Database · checked Sep 22, 2026
22	Keystone Drill Services	Partial evidence	Somerset, PA, United StatesHQ checked Sep 22, 2026	11-50	31 contacts →
	Partial evidence “Keystone Drill Services pairs over a century of drilling experience with a diverse supplier network to resolve drill-related issues with unprecedented efficiency.” Source: RevenueBase Database · checked Sep 22, 2026
23	Universal Fluid Services, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 22, 2026	11-50	31 contacts →
	Partial evidence “At Universal Fluid Services we combine unmatched drilling experience with our unique ability to fully understand customer needs, resulting in consistently better drilling outcomes.” Source: RevenueBase Database · checked Sep 22, 2026
24	Cowin & Company, INC	Indirect evidence	Birmingham, AL, United StatesHQ checked Sep 22, 2026	51-200	31 contacts →
	Indirect evidence “Welcome to: Cowin & Company, Inc- Mining Contractors and Engineers For three generations, Cowin & Company, Inc.” Source: RevenueBase Database · checked Sep 22, 2026
25	NISS	Partial evidence	Kellogg, ID, United StatesHQ checked Sep 22, 2026	51-200	30 contacts →
	Partial evidence “Nasco Industrial Services & Supply (NISS) is a full-service mining supply and contract drilling and General Contracting Mining agency, built to serve the industries that make…” Source: RevenueBase Database · checked Sep 22, 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: slant hole drilling companies. 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 slant hole drilling companies.
Partial evidence: Its own public description names part of slant hole drilling companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name slant hole drilling companies. 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 306 slant hole drilling companies based in the United States

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Slant hole drilling companies based in the United States at a glance

As of Sep 22, 2026

25.8%Verified-email coverage

29.8Average contacts per company

11-50Median size (employees)

5.9%Largest-city concentration · Houston

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

109

11-50

126

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

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 306 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 slant hole drilling companies, 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 “slant hole drilling companies”. 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 slant hole drilling companies), 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 slant hole drilling companies, 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, 2,354 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 22, 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 slant hole drilling companies, 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 slant hole drilling companies are there based in the United States?

RevenueBase identified 306 slant hole drilling companies 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?

Boart Longyear, headquartered in West Valley City, tops this list with the largest team on record.

Which city has the most slant hole drilling companies?

Houston leads with 18 headquartered companies, followed by Elko (8) and Midland (6).

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 2,354 verified decision-maker contacts tracked across these 306 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 22, 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.