| Supply of EN590 ULSDCompetitive Procedure With Negotiation | Iarnród Eireann-Irish Rail | Valero Marketing Ireland Limited | | €280,000,000 |
| Provision of Home Support ServicesOpen Procedure | Health Service Executive (HSE) | All in Care Limited and 46 others | | €192,000,000 |
| The Operation of Public Bus Passenger Services on Certain Outer Dublin Metropolitan RoutesCompetitive Procedure With Negotiation | National Transport Authority | The Go-Ahead Group plc | | €171,646,195 |
| Mini Competition for the Supply of Natural Gas to Education Sector (Primary and Secondary Schools, the Third Level Sector, and the Education and Training Board (ETB) Sector)Direct Invite – Mini-Competition | The Office of Government Procurement | SSE Airtricity Limited | | €49,000,000 |
| Recombinant Coagulation Factor VIIIOpen Procedure | St James's Hospital | Swedish Orphan Biovitrum Ltd (Sobi Ltd),.,.,.,.,.,.,.,.,.,.,., | | €40,000,000 |
| Invitation to Tender for Social Inclusion Community Activation Programme (SICAP) 2018 - 2022Open Procedure | Dublin City Council | Ballyfermot Chapelizod Partnership and 4 others | | €32,438,934 |
| Procurement of Buses & Coaches for Bus EireannCompetitive Procedure With Negotiation | Bus Eireann/Irish Bus | VDL Bus and Coach BV and Volvo Group UK Ltd T/A Volvo Bus | | €30,088,000 |
| Childcare Residential Services on behalf of TuslaOpen Procedure | Health Service Executive (HSE) | Daffodil Care Services Unlimited Company and 3 others | | €23,616,000 |
| Pre-Qualification Process to access suitability of Tenderers for the Dinish Wharf Expansion at Castletownbere Fishery Harbour Centre, Co. CorkRestricted Procedure | Department of Agriculture Food and the Marine | L. & M. Keating Limited | | €23,438,323 |
| Provision of 131 no. Rapid Delivery Housing Units in Dublin City Council's Administrative AreaRestricted Procedure | Dublin City Council | ABM ABM Design and Build / Construction and 2 others | | €20,000,000 |
| Mini Competition for the Supply of Microsoft Licencing Solution Partner Services for the HSE.Direct Invite – Mini-Competition | The Office of Government Procurement | SoftwareONE | | €13,500,000 |
| Provision of 70 No. Rapid Delivery Housing units in Dublin City Council's admistrative areaRestricted Procedure | Dublin City Council | Abm Contractors Limited | | €12,655,596 |
| Mini Competition for the Provision of Lot 1 Microsoft LSP Services for Dublin City Council.Direct Invite – Mini-Competition | The Office of Government Procurement | Micromail Limited | | €12,000,000 |
| Western Distributor Road Phase 2 Main Construction ContractOpen Procedure | Sligo County Council | Siac Construction Limited | | €11,999,427 |
| Services for the vaccination and removal of wildlife as part of an animal disease eradication programmeOpen Procedure | Department of Agriculture Food and the Marine | FRS Recruitment | | €11,014,000 |
| Mini Competition for Firewalls and Associated Services for The Office of the Revenue Commissioners.Direct Invite – Mini-Competition | The Office of Government Procurement | Ecom Solutions Limited | | €10,720,000 |
| Services in Relation to the Social Inclusion and Community Activation Programme 2018 – 2022Open Procedure | South Dublin County Council | South Dublin County Partnership | | €10,530,645 |
| Mini Competition for the Provision of Microsoft Licencing Solution Partner Services for the Local Government Management Agency (LGMA).Direct Invite – Mini-Competition | The Office of Government Procurement | Micromail Limited | | €10,500,000 |
| I-SEM Phase 2: To Support Nominated Electricity Market Operator (NEMO) FunctionsCompetitive Procedure With Negotiation | EirGrid plc | Epex Spot | | €10,350,543 |
| Mini Competition for the provision of Microsoft Licencing Solution Partner Services for the Department of Employment Affairs and Social Protection.Direct Invite – Mini-Competition | The Office of Government Procurement | Micromail Limited | | €10,250,000 |
| City NorthWest Quarter Regeneration (CNWQR), Phase2A, Construction of 47 Dwellings, consisting of 11 nr. 3 storey & 21 nr. 2 storey houses; 15 nr. apartments and associated siteOpen Procedure | Cork City Council | Murnane and O'Shea Limited | | €9,482,243 |
| The implementation, production, personalisation and distribution of the Public Services Card and the provision of associated servicesOpen Procedure | Department of Social Protection | DLRS Limited and IDEMIA The Netherlands BV | | €9,410,000 |
| ITT for Executive Development ProgrammesOpen Procedure | Bord Bia (Irish Food Board) | UCD School of Business | | €9,400,000 |
| Lot 2 - Mini Competition for the Provision of Commercial Cleaning Services Clinical and Non-Clinical for Our Lady’s Children’s Hospital CrumlinDirect Invite – Mini-Competition | The Office of Government Procurement | Derry Court Company Limited | | €8,387,492 |
| Event Stand Construction PanelOpen Procedure | Bord Bia (Irish Food Board) | Display Contracts International Limited and 3 others | | €8,000,000 |