- Abbott Vascular Devices Ireland Ltd
- Abbott Ireland Ltd (Cavan)
- Abbott Ireland Ltd (Longford)
- Abbott Ireland Pharmaceutical Operation
- Allergan Pharmaceuticals Ltd
- Alza Ireland Ltd
- Analog Devices BV
- Arkil Ltd
- Arvato Digital Services Ireland (formerly Sonopress Ireland Ltd)
- Associated Packaging Technologies
- Astellas Ireland Co. Ltd (Dublin)
- Astellas Ireland Co. Ltd. (Kerry)
- Ballina Beverages
- Bausch & Lomb Ireland Ltd
- Baxter Healthcare SA
- Bitech Engineering (Glen Dimplex Group)
- Boliden Tara Mines Ltd
- Boston Scientific Ireland Ltd (Clonmel)
- Boston Scientific Ireland Ltd (Cork)
- Boston Scientific Ireland Ltd (Galway)
- Braun Oral-B Ireland Ltd
- Bristol-Myers Squibb (Cruiserath)
- Bristol-Myers Squibb (Swords)
- Bulmers Ltd
- Cadbury Ireland Ltd (Dublin)
- Cadbury Ireland Ltd (Kerry)
- Cantrell & Cochrane Ltd (Dublin)
- Cara Partners
- Carbery Milk Products Lt
- CITADEL100 Datacenters Limited
- Citi
| - Cognis Ireland Ltd
- Connacht Gold Ltd (Shannonside)
- ConocoPhillips Whitegate Refinery Ltd
- Covidien (Athlone)
- Covidien (Mulhuddart)
- Cuisine de France Ltd
- Dairygold Co-op Society
- Dawn Meats Ltd (Ballyhaunis)
- Depuy (Ireland) Ltd
- Diageo Bailey’s Global Supply
- Diageo Ireland (Dundalk)
- Diageo Ireland (Kilkenny)
- Diageo Ireland (St James’s Gate)
- Diageo Ireland (Waterford)
- Donegal Meat Processors
- Dublin Airport Authority
- Edenderry Power Ltd
- Eircom
- Elan Pharma
- Element Six Ltd
- Eli Lilly S.A.
- EMC Ireland Ltd
- Genzyme Ireland Ltd
- Glanbia Consumer Foods Ltd (Inch)
- Glanbia Ingredients (Ballyragget) Ltd
- Glanbia Ingredients (Virginia) Ltd
- GlaxoSmithKline Ltd (Cork)
- GlaxoSmithKline Ltd (Dungarvan)
- Google Ireland
- Green Isle Foods (Gurteen)
- Green Isle Foods (Longford)
- Green Isle Foods (Naas)
- Green Isle Foods (Portumna)
| - Gypsum Industries Ltd
- Hewlett-Packard (Manufacturing) Ltd
- HJ Heinz Frozen and Chilled Foods Ltd
- Honeywell Turbo Technologies
- Iarnród Éireann
- IBM International Holdings
- Intel Ireland Ltd
- Interxion Ireland Limited
- Irish Cement (Limerick)
- Irish Cement (Platin)
- Janssen Pharmaceutical Ltd
- Kerry Foods Ltd (Shillelagh)
- Kerry Ingredients (Listowel)
- Kerry Ingredients (Charleville)
- Kostal Ireland Gmbh
- Lagan Cement Ltd
- Lakeland Dairies (Bailieboro)
- LEO Pharma
- Lisheen Mine
- Masonite Ireland
- Merck Sharp & Dohme (Ireland)
- Micro-Bio Ireland Ltd
- Microsoft
- Molex Ireland
- Monaghan Mushrooms
- Novartis Ringaskiddy Ltd
- Organic Lens Manufacturing
- Pfizer Ireland Pharmaceuticals (Little Island)
- Pfizer Ireland Pharmaceuticals (Ringaskiddy)
- Premier Periclase Ltd
- Procter & Gamble Ireland (Naas)
- Quinn Cement Ltd
- Roadstone Wood Group
| - Roche Ireland Ltd
- Rosderra Irish Meats Group Ltd
- RUSAL Aughinish
- Schering Plough (Avondale) Co.
- Schering Plough (Brinny) Co.
- Schering Plough (Swords) Co. (formally Organon Ireland)
- Silver Hill Foods
- Takeda Ireland Ltd (Bray)
- Takeda Ireland Ltd (Grange Castle)
- Tech Group Europe Ltd (Dublin)
- Tegral Building Products
- Temmler Ireland Ltd
- Tesco Ireland Ltd
- Teva Pharmaceuticals Ireland
- Thermo King Europe
- Transitions Optical Ltd
- United Fish Industries Ltd
- Vistakon Ireland
- Vitra Ireland Ltd
- Vodafone
- Wellman International Ltd
- Western Proteins
- Wyeth Medica Ireland Ltd
- Wyeth Nutritionals Ireland
- Xerox (Europe) Ltd
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