Utilities

• Guyana Telephone and Telegraph Company (GT&T)
• Digicel
  Digicel
  Digicel is a mobile phone network provider covering parts of Oceania, Central America, and the Caribbean regions. The company is owned by Irishman Denis O'Brien, is incorporated in Bermuda, and based in Jamaica. It provides mobile services in 26 countries and territories throughout the Caribbean...
  
  
• GuyOil
• Guyana Power and Light
  Guyana Power and Light
  Guyana Power and Light is a utility company in Guyana, providing electric power in the country. Its distribution system is unique because it is supplied with 50 and 60 cycle power. Domestic voltage can be 110 or 220 depending on the area....
  
  
• Guyana Water Authority – formed in 1972 to take over the provision of potable water in all areas except the bauxite mining areas, sugar estates, municipalities and cities.

Overseas based companies with major presence

• Caribbean Airlines
  Caribbean Airlines
  Caribbean Airlines Limited operating as Caribbean Airlines is the national airline of Trinidad and Tobago. The airline is also flag carrier to Jamaica through its subsidiary, Caribbean Airlines-Air Jamaica Transition Limited or Air Jamaica....
  
  
• Western Union
  Western Union
  The Western Union Company is a financial services and communications company based in the United States. Its North American headquarters is in Englewood, Colorado. Up until 2006, Western Union was the best-known U.S...
  
  
• Royal Dutch Shell
  Royal Dutch Shell
  Royal Dutch Shell plc , commonly known as Shell, is a global oil and gas company headquartered in The Hague, Netherlands and with its registered office in London, United Kingdom. It is the fifth-largest company in the world according to a composite measure by Forbes magazine and one of the six...
  
  
• Texaco
  Texaco
  Texaco is the name of an American oil retail brand. Its flagship product is its fuel "Texaco with Techron". It also owns the Havoline motor oil brand....
  
  
• North American Airlines
  North American Airlines
  North American Airlines, Inc. is an American airline with its headquarters in Building 141 on the grounds of John F. Kennedy International Airport in Jamaica, Queens, New York City, USA. Prior to May 2008, it operated scheduled international services from the USA to Africa and Guyana. Today, it...
  
  
• The Coca-Cola Company
  The Coca-Cola Company
  The Coca-Cola Company is an American multinational beverage corporation and manufacturer, retailer and marketer of non-alcoholic beverage concentrates and syrups. The company is best known for its flagship product Coca-Cola, invented in 1886 by pharmacist John Stith Pemberton in Columbus, Georgia...
  
  
• PepsiCo, Inc.
• Neal & Massy Group of Companies

Others

• Guyana Sugar Corporation Inc. (GuySuCo)
• National Milling Company of Guyana
  National Milling Company of Guyana
  National Milling Company of Guyana , a subsidiary of U.S. based Seaboard Corporation, is the oldest commercial flour mill in Guyana. It started operations in1969....