Company Name

Industry

Location

Revenue

Employees

Alliance Resource Partners, L.P.

Mining & Metals

United States, Oklahoma

$1B and Over

1001-5000

ONEOK

Oil & Energy

United States, Oklahoma

$1B and Over

1001-5000

Devon Energy

Oil & Energy

United States, Oklahoma

$1B and Over

1001-5000

Chesapeake Energy

Oil & Energy

United States, Oklahoma

$1B and Over

1001-5000

Magellan Midstream Partners

Oil & Energy

United States, Oklahoma

$1B and Over

1001-5000

Continental Resources

Oil & Energy

United States, Oklahoma

$1B and Over

1001-5000

AAON

Machinery

United States, Oklahoma

$500M to $1B

1001-5000

T.D. Williamson

Oil & Energy

United States, Oklahoma

$500M to $1B

1001-5000

Quality Integrated Services

Oil & Energy

United States, Oklahoma

$500M to $1B

1001-5000

Zeeco

Oil & Energy

United States, Oklahoma

$250M to $500M

1001-5000

Enable Midstream Partners

Oil & Energy

United States, Oklahoma

$250M to $500M

1001-5000

WPX Energy

Oil & Energy

United States, Oklahoma

$250M to $500M

1001-5000

Ditch Witch

Machinery

United States, Oklahoma

$250M to $500M

1001-5000

NORDAM

Aviation & Aerospace

United States, Oklahoma

$250M to $500M

1001-5000

Webco Industries

Oil & Energy

United States, Oklahoma

$250M to $500M

1001-5000

Ruhrpumpen

Machinery

United States, Oklahoma

$250M to $500M

1001-5000

Unit Drilling Company

Oil & Energy

United States, Oklahoma

$250M to $500M

1001-5000

Tucker Energy Services

Oil & Energy

United States, Oklahoma

$250M to $500M

1001-5000

John Zink Hamworthy Combustion

Oil & Energy

United States, Oklahoma

$100M to $250M

1001-5000

ATC Drivetrain

Automotive

United States, Oklahoma

$100M to $250M

1001-5000