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Oklahoma— USA

Companies in Oklahoma

654.4K companies registered in Oklahoma, sourced from official business registers and enriched with industry, size, location and contact data. Below: the largest companies by reported revenue, and how the Oklahoma business base breaks down by industry and headcount.

654.4K
companies
#30
of 50 states
1%
of US records
15
industries ranked
September 2026
data updated

Part of the United States company directory.

Rankings

Largest companies in Oklahoma

By reported (actual) revenue, updated September 2026. Public-sector entities are excluded.

#CompanyIndustryCityRevenue (USD)Employees
1Oneok, Inc.Trade of gas through mainsTulsa$33.6B6,326
2The Williams Companies IncManufacture of gas; distribution of gaseous fuels through mainsTulsa$11.9B5,987
3Continental Resources, Inc.Extraction of crude petroleumOklahoma City$7.7B1,378
4Helmerich & Payne, Inc.Support activities for petroleum and natural gas extractionTulsa$3.7B6,200
5Bok Financial CorporationOther monetary intermediationTulsa$3.4B5,034
6Bokf, National AssociationOther monetary intermediationTulsa$3.3B4,822
7Express Services, Inc.Temporary employment agency activitiesOklahoma City$3.3B412,707
8Oklahoma Gas and Electric CompanyElectric power generation, transmission and distributionOklahoma City$3.3B2,248
9Oge Energy Corp.Electric power generation, transmission and distributionOklahoma City$3.3B2,248
10NGL Energy Partners LPWholesale of solid, liquid and gaseous fuels and related productsTulsa$3.2B449
11Transcontinental Gas Pipe Line Company, LLCManufacture of gas; distribution of gaseous fuels through mainsTulsa$3B11
12Integris Health, Inc.Hospital activitiesOklahoma City$2.8B9,500
13One Gas, Inc.Trade of gas through mainsTulsa$2.4B4,000
14Everett HospitalHospital activitiesOklahoma City$2.4B2,800
15Magellan Midstream Partners, LPWholesale of solid, liquid and gaseous fuels and related productsTulsa$2.3B1,720
16Ou Medicine, Inc.General medical practice activitiesOklahoma City$2.2B2,900
17Cherokee Nation Businesses LLCRepair and maintenance of aircraft and spacecraftCatoosa$2.2B8,803
18Alliance Resource Partners LPMining of ligniteTulsa$2.2B3,575
19Midfirst Insurance BankOther monetary intermediationOklahoma City$2.1B5
20Paycom Software, Inc.Computer programming activitiesOklahoma City$2.1B7,306
21Public Service Company of OklahomaElectric power generation, transmission and distributionTulsa$2B1,150
22Saint Francis Hospital, Inc.Hospital activitiesTulsa$1.8B4,000
23Midfirst BankOther monetary intermediationOklahoma City$1.5B1,346
24Aaon, Inc.Manufacture of non-domestic cooling and ventilation equipmentTulsa$1.4B5,897
25Gulfport Energy CorporationExtraction of crude petroleumOklahoma City$1.4B245

Top 25 by revenue reported to the register. Companies filing no revenue figure are not ranked, whatever their size.

Oneok, Inc. leads Oklahoma at $33.6B in reported revenue, from Tulsa.

Coverage

Companies by industry in Oklahoma

The industries holding the most companies, by NACE activity code.

Other business support service activities n.e.c.8299
46,797
Trusts, funds and similar financial entities6430
20,904
Business and other management consultancy activities7022
19,847
Construction of residential and non-residential buildings4120
19,505
Management of real estate on a fee or contract basis6832
18,925
Restaurants and mobile food service activities5610
16,624
Activities of religious organisations9491
16,507
Other human health activities8690
15,198
General medical practice activities8621
12,808
Mixed farming0150
12,807
Maintenance and repair of motor vehicles4520
12,452
Real estate agencies6831
12,022
Legal activities6910
11,105
Activities of other membership organisations n.e.c.9499
10,510
Other specialised construction activities n.e.c.4399
9,530

Ranked by number of companies. Each record carries its NACE code alongside SIC and NAICS, so the same segment can be pulled in any of the three schemes.

Browse these directories

Other business support service activities n.e.c. is the largest activity in Oklahoma, with 46,797 companies.

Distribution

Company size

By number of employees.

1-4
572,602
5-9
42,659
10-19
13,942
20-49
9,620
50-99
3,611
100-199
1,733
200-499
988
500-999
279
1000+
248

8,730 companies have no disclosed headcount (excluded from the chart).

89% of Oklahoma companies with a disclosed headcount fall in the 1-4 employee band.

Data coverage

What a Oklahoma record carries

Share of the state's companies holding each contact field.

25%

with a website

44%

with a phone number

16%

with an email address

Counted against the 654.4K companies in Oklahoma. Firmographics — industry, size, address, status — are present on every record.

FAQ

Companies in Oklahoma — frequently asked questions

There are 654.4K companies registered in Oklahoma in the InfobelPRO database, across every sector from sole proprietorships to large enterprises.
By revenue reported to the register, the largest company headquartered in Oklahoma is Oneok, Inc., based in Tulsa, in trade of gas through mains.
Other business support service activities n.e.c. (46,797 companies), Trusts, funds and similar financial entities (20,904 companies), Business and other management consultancy activities (19,847 companies) lead the Oklahoma business base by number of companies.
Registered name and address, industry classification in NACE, SIC and NAICS, company status and legal form, employee band, reported revenue where filed, and contact fields — website, phone and email — where available.
Yes. The Oklahoma file is available as a bulk export or through the API, filtered by industry, company size, city or revenue. Licensing is on volume and use, not per seat.

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