1. CRH

CRH plc is an international building materials group. The group was formed through a merger in 1970 of two leading Irish public companies, Cement Limited (established in 1936) and Roadstone Limited (1949). It is headquartered in Dublin.

2. Peninsula Petroleum

Peninsula Petroleum Ltd is a physical bunker and lubricant supplier at the ports of Gibraltar, Ceuta, Canary Islands and Panama and is active as a worldwide trader with annual sales in excess of 6,000,000 metric tonnes. As part of the Gibunco Group, it also provides ...

3. CMC

CMC distributes and markets coal products which is mined at Cerrejón, Colombia. It has an office in Dublin where it employs 31 people. Europe is the largest single market for CMC and it also sells to central and south america, the US and Asia. It is owned in equal par...

4. Valero Energy Corporation

Valero Energy Corporation, through its subsidiaries, is an international manufacturer and marketer of transportation fuels, petrochemical products and power. Valero subsidiaries employ approximately 10,000 people, and assets include 15 petroleum refineries with a combin...

5. Tullow Oil

Tullow oil is an independent oil and gas exploration and production company. Its focus is on finding and monetising oil in Africa and the Atlantic Margins. Its portfolio of over 135 licences spans 22 countries and is organised into three regions. It is headquartered in ...

6. Circle K Energy

Topaz Direct is a division of Topaz Energy Limited. The firm supplies home heating oil and fuel to farmers, businesses, schools, churches, wholesale, marine and transport customers. With over 444 stations nationwide, Topaz describe themselves as Ireland’s largest fuel ...

7. Bord Gáis Energy

Bord Gáis Energy is a gas and electricity supplier and supplier of energy services. It generates, sells and trades energy for use in the Republic of Ireland. It has been in operation since 1976 and today supplies over 750,000 customers with energy in Ireland. In 2014...

8. SSE Airtricity

SSE Airtricity is in independent energy provider, supplying over half a million domestic and commercial gas, electricity and home energy services customers in the Republic of Ireland and Northern Ireland. The company is a wholly-owned division of the Top 40 FTSE listed ...

9. Josar Holdings (Kentech)

Kentech provides engineering, procurement, construction, commissioning and maintenance services to the energy industry. Its customers are in the oil, gas, power, and petrochemical industries in the Middle East, Russia and Mexico. The company was founded in Ireland...

10. EirGrid

EirGrid plc is a leading Irish energy business, dedicated to the provision of transmission and market services for the benefit of electricity consumers. It is a state-owned commercial company. EirGrid holds licences as independent electricity Transmission System Ope...

11. Waters Celtic

Waters Celtic is a holding company which acquired Waters Technologies Ireland from Waters Chromatography Ireland in 2005. Waters Technologies Ireland manufactures high performance chromatography columns and other related services. In 2007 the holding company bought Wate...

12. Rusal Aughinish

Rusal Aughinish is a subsidiary of RUSAL. RUSAL’s largest alumina refinery, Aughinish Alumina, based in Limerick is Europe’s largest alumina refinery and a major alumina asset of RUSAL. The facility infrastructure includes a deepwater terminal on the Shannon estua...

13. Maxol

McMullan Bros is the family-owned company behind the fuel wholesaler and retailer Maxol. Maxol has a network of more than 230 service stations and 22 authorised oil distributors.

14. Diesel Card Ireland

Diesel Card Ireland Limited is Ireland's largest fuel card provider with over 1000 sites. It has offices in Galway and Derry. The principal activity of the group is the resale of oil products. DCI Ireland, which has offices in Derry and Galway. provides fuel card ser...

15. Northern Ireland Water

Northern Ireland Water provides water and sewerage services in Northern Ireland. The company supplies 575 million litres of clean water a day for almost 1.8 million people as well as treating 340 million litres of wastewater a day. Northern Ireland Water is a Governmen...

16. Kenmare Resources

Kenmare Resources plc has been a mining and production company since 1972. The company has a primary listing on the London Stock Exchange and secondary listing on the Irish Stock Exchange. The principal activities of the group are the exploration for commercial deposits...

17. Coillte

Coillte's core purpose is to enrich lives locally, nationally and globally through the innovative and sustainable management of natural resources Coillte is a commercial company operating in forestry, land based businesses, renewable energy and panel products. Th...

18. Bord na Mona

Bord Na Móna is an integrated utility service provider encompassing electricity, heating, resource recovery, water, growing media and related services. It is headquartered in Newbridge, Co Kildare and employs over 2,000 people.

19. Coolkeeragh ESB

The combined-cycle gas turbine plant at Coolkeeragh was developed by Coolkeeragh ESB Ltd, a partnership between Coolkeeragh Power Limited and ESB International. The station was commissioned in June 2005 and is operated and maintained by ESBI O&M Solutions. ESBI are ...

20. Glennon Brothers

Since 1913, Glennon Brothers has been manufacturing timber products. Through Glennon Brothers plants in Longford and Fermoy, and Windymains Timber and Adam Wilsons in Scotland, it supplies both the Irish and UK markets with products for the construction, pallet wood and...