- Abbott Ireland Ltd (Cavan)
- Abbott Ireland Pharmaceutical Operation
- Allergan Pharmaceuticals Ltd
- Alza Ireland Ltd
- Associated Packaging Technologies
- Astellas Ireland Co. Ltd (Dublin)
- Astellas Ireland Co. Ltd. (Kerry)
- Baxter Healthcare SA
- Bitech Engineering (Glen Dimplex Group)
- Boliden Tara Mines Ltd
- Boston Scientific Ireland Ltd (Galway)
- Bristol-Myers Squibb (Cruiserath)
- Bristol-Myers Squibb (Swords)
- Bulmers Ltd
- Cadbury Ireland Ltd (Dublin)
- Citadel 100 Datacenters Limited
- Cognis Ireland Ltd
- Connacht Gold Ltd (Shannonside)
- 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
- Edenderry Power Ltd
- Element Six Ltd
- Eli Lilly S.A.
- EMC Ireland Ltd
- Glanbia Consumer Foods Ltd (Inch)
- Glanbia Ingredients (Ballyragget) Ltd
- Glanbia Ingredients (Virginia) Ltd
| - GlaxoSmithKline Ltd (Cork)
- Google Ireland
- Green Isle Foods (Gurteen)
- Green Isle Foods (Longford) Ltd
- Green Isle Foods (Naas)
- Green Isle Foods (Portumna)
- HJ Heinz Frozen and Chilled Foods Ltd
- Intel Ireland Ltd
- Irish Cement (Limerick)
- Irish Cement (Platin)
- Janssen Pharmaceutical Ltd
- Lagan Cement Ltd
- LEO Pharma
- Molex Ireland
- Pfizer Ireland Pharmaceuticals (Little Island)
- Quinn Cement Ltd
- Roadstone Wood Group
- Roche Ireland Ltd
- Rusal Aughinish
- Schering Plough (Avondale) Co.
- Schering Plough (Brinny) Co.
- Silver Hill Foods
- Takeda Ireland Ltd (Grange Castle)
- Tesco Ireland Ltd
- Teva Pharmaceuticals Ireland
- Vistakon Ireland
- Vitra Ireland Ltd
- Vodafone
- Wyeth Medica Ireland Ltd
- Xerox (Europe) Ltd
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