Company lists · Data refreshed September 2026

Top 25 Refinery staffing companies worldwide

Name: Refinery staffing companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 5,335 companies tracked

RevenueBase identified 5,335 refinery staffing companies worldwide as of September 2026 and tracks 117,026 professional contacts across them, including 16,568 with verified work emails. The United States is the largest market and London the largest hub.

This list covers refinery staffing companies worldwide, 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 29, 2026. Country and city lists for refinery staffing companies follow the table.

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 29, 2026 86% judged on-target in blind review

5,335Companies

117,026Contacts tracked

16,568Verified emails

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The 25 largest refinery staffing companies worldwide

Ranked by team size

Top 25 of 5,335 refinery staffing companies worldwide, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to refinery staffing 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	CITGO	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	1,001-5,000	4,396 contacts →
	Indirect evidence “CITGO Petroleum Corporation is a recognized leader in the refining industry and operates under the well-known CITGO brand.” Source: RevenueBase Database · checked Sep 29, 2026
2	NES Fircroft	Partial evidence	Altrincham, United KingdomHQ checked Sep 29, 2026	1,001-5,000	2,951 contacts →
	Partial evidence “With over 90 years’ combined experience of delivering workforce solutions to the global energy industry, NES Fircroft is proud to be the world’s leading engineering staffing…” Source: RevenueBase Database · checked Sep 29, 2026
3	REFIT	Indirect evidence	Rio De Janeiro, BrazilHQ checked Sep 29, 2026	501-1,000	1,406 contacts →
	Indirect evidence “Inaugurada em 1954, a Refit nasceu para ajudar o Brasil a escrever sua história de sucesso no mercado de petróleo.” Source: RevenueBase Database · checked Sep 29, 2026
4	Delek US	Indirect evidence	Brentwood, TN, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,297 contacts →
	Indirect evidence “Delek US is a diversified downstream energy company with assets in petroleum refining, asphalt, renewable fuels, and logistics.” Source: RevenueBase Database · checked Sep 29, 2026
5	Attock Refinery Limited	Partial evidence	Rawalpindi, PakistanHQ checked Sep 29, 2026	501-1,000	1,270 contacts →
	Partial evidence “Attock Refinery Limited (ARL) is the pioneer and pacesetter in Pakistan’s petroleum refining sector.” Source: RevenueBase Database · checked Sep 29, 2026
6	Chennai Petroleum Corp. LTD Indian OIL	Indirect evidence	Chennai, IndiaHQ checked Sep 29, 2026	1,001-5,000	1,194 contacts →
	Indirect evidence “Chennai Petroleum Corporation Limited (CPCL) is a subsidiary of IOCL with world class refining technologies and a dominant presence in South India.” Source: RevenueBase Database · checked Sep 29, 2026
7	TRS Staffing Solutions	Partial evidence	Greenville, United StatesHQ checked Sep 29, 2026	201-500	1,187 contacts →
	Partial evidence “TRS Staffing Solutions is a world leading engineering recruitment agency specialising in the recruitment and supply of professional, engineering, technical and field talent.” Source: RevenueBase Database · checked Sep 29, 2026
8	National Refinery Limited	Partial evidence	Karachi, PakistanHQ checked Sep 29, 2026	1,001-5,000	1,097 contacts →
	Partial evidence “National Refinery Limited ( NRL ) was incorporated on August 19, 1963 as a public limited company.” Source: RevenueBase Database · checked Sep 29, 2026
9	Sraco Human Resources Company	Indirect evidence	Dammam, Saudi ArabiaHQ checked Sep 29, 2026	10001+	947 contacts →
	Indirect evidence “SRACO Human Resources Company was established in 2016 to provide the Saudi market with qualified and trained manpower for all activities, commercial, industrial, and domestic…” Source: RevenueBase Database · checked Sep 29, 2026
10	Sapref	Indirect evidence	Prospecton, South AfricaHQ checked Sep 29, 2026	501-1,000	944 contacts →
	Indirect evidence “SAPREF is a joint venture between Shell SA Refining and BP Southern Africa.” Source: RevenueBase Database · checked Sep 29, 2026
11	Bolashak Atyrau LLP & Bolashak International LTD	Indirect evidence	Atyrau, KazakhstanHQ checked Sep 29, 2026	5,001-10,000	793 contacts →
	Indirect evidence “Bolashak Group is a market leader in the provision of Technical & Engineering solutions to Kazakhstan’s Oil & Gas, Petrochemical, Construction, Mining, Telecommunication…” Source: RevenueBase Database · checked Sep 29, 2026
12	Matchtech	Indirect evidence	Whiteley, United KingdomHQ checked Sep 29, 2026	201-500	754 contacts →
	Indirect evidence “At Matchtech, we do more than recruit.” Source: RevenueBase Database · checked Sep 29, 2026
13	Trojan Labor	Partial evidence	Goose Creek, SC, United StatesHQ checked Sep 29, 2026	n/a	732 contacts →
	Partial evidence “Trojan Labor Specializes in matching Customers who have industrial and Light Industrial staffing needs while never forgetting who the CUSTOMER is.” Source: RevenueBase Database · checked Sep 29, 2026
14	NES Global Talent	Indirect evidence	United KingdomHQ checked Sep 29, 2026	1,001-5,000	726 contacts →
	Indirect evidence “NES Global Talent provided engineering and technical personnel to the Oil & Gas, Power, Life Science and mining sectors.” Source: RevenueBase Database · checked Sep 29, 2026
15	PTS Advance	Indirect evidence	Tustin, CA, United StatesHQ checked Sep 29, 2026	501-1,000	706 contacts →
	Indirect evidence “PTS Advance teams up with thousands of candidates, clients, and partners to advance workforce utilization in the Oil, Gas & Chemicals, Power & Renewables, Advanced Manufacturing…” Source: RevenueBase Database · checked Sep 29, 2026
16	Bpcl Kochi Refinery	Partial evidence	Ernakulam, IndiaHQ checked Sep 29, 2026	1,001-5,000	680 contacts →
	Partial evidence “The BPCL Kochi Refinery, embarked on its journey in 1966 with a capacity of barrels per day.” Source: RevenueBase Database · checked Sep 29, 2026
17	Fircroft	Partial evidence	Warrington, United KingdomHQ checked Sep 29, 2026	501-1,000	589 contacts →
	Partial evidence “Fircroft is now part of the NES Fircroft group - the world’s leading engineering staffing provider spanning the Oil & Gas, Power & Renewables, Infrastructure, Life Sciences…” Source: RevenueBase Database · checked Sep 29, 2026
18	Island Operating Company	Indirect evidence	Scott, LA, United StatesHQ checked Sep 29, 2026	1,001-5,000	570 contacts →
	Indirect evidence “Improving efficiency and reducing costs, all while meeting safety requirements, is the challenge faced by every operator in the oil and gas industry.” Source: RevenueBase Database · checked Sep 29, 2026
19	Kavin Engineering And Services	Indirect evidence	Coimbatore, IndiaHQ checked Sep 29, 2026	501-1,000	536 contacts →
	Indirect evidence “Kavin Engineering And Services Private Limited are leaders in Engineering & Services.” Source: RevenueBase Database · checked Sep 29, 2026
20	Rotostat Services Pvt. LTD	Indirect evidence	Mumbai, IndiaHQ checked Sep 29, 2026	1,001-5,000	524 contacts →
	Indirect evidence “Rotostat Services Pvt.” Source: RevenueBase Database · checked Sep 29, 2026
21	Dynamic Staffing Services	Indirect evidence	New Delhi, IndiaHQ checked Sep 29, 2026	501-1,000	512 contacts →
	Indirect evidence “Rated #1- Building the lives of People - A recruitment & outsourcing firm that prides itself on ethics!# 47 years in business.” Source: RevenueBase Database · checked Sep 29, 2026
22	Turn2 Specialty Companies	Indirect evidence	Baytown, TX, United StatesHQ checked Sep 29, 2026	1,001-5,000	475 contacts →
	Indirect evidence “Turn2 Specialty Companies is the premier provider of specialty turnaround services in the refining, petrochemical, and power industries.” Source: RevenueBase Database · checked Sep 29, 2026
23	NRL	Indirect evidence	Wigan, United KingdomHQ checked Sep 29, 2026	51-200	471 contacts →
	Indirect evidence “At NRL, our people play an integral role on major projects across a range of critical sectors including renewable energy, power generation and infrastructure.” Source: RevenueBase Database · checked Sep 29, 2026
24	Entegee	Indirect evidence	Burlington, MA, United StatesHQ checked Sep 29, 2026	201-500	468 contacts →
	Indirect evidence “For the last sixty years Entegee has provided Fortune 500 and other companies with highly qualified engineering and technical personnel.” Source: RevenueBase Database · checked Sep 29, 2026
25	Ineos Grangemouth	Indirect evidence	Grangemouth, United KingdomHQ checked Sep 29, 2026	1,001-5,000	466 contacts →
	Indirect evidence “Located at Grangemouth, some 40km west of Edinburgh, one of INEOS’ largest manufacturing sites directly employs c1500 highly skilled people.” Source: RevenueBase Database · checked Sep 29, 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: refinery staffing 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 refinery staffing companies.
Partial evidence: Its own public description names part of refinery staffing companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name refinery staffing 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 5,335 refinery staffing companies worldwide

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Refinery staffing companies worldwide at a glance

As of Sep 29, 2026

14.2%Verified-email coverage

21.9Average contacts per company

11-50Median size (employees)

3.1%Largest-city concentration · London

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

2,561

11-50

1,491

51-200

786

201-500

251

501-1,000

122

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 refinery staffing 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.
Coverage: Every country. Country and city lists for refinery staffing companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “refinery staffing 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 refinery staffing 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 refinery staffing companies, and records with no verified work email.
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, 16,568 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 29, 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.

Refinery staffing companies by location

31 lists · largest first

Every Refinery staffing companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 refinery staffing 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 refinery staffing companies are there worldwide?

RevenueBase identified 5,335 refinery staffing companies worldwide 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?

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

Which country has the most refinery staffing companies?

The United States leads with 867 companies, followed by the United Kingdom (805) and India (432). Every refinery staffing companies list by country and city is linked on this page.

Which city has the most refinery staffing companies?

London leads with 168 headquartered companies, followed by Houston (139) and Mumbai (94).

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 16,568 verified decision-maker contacts tracked across these 5,335 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 29, 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.