| The delivery, installation, commissioning, and maintenance of five Dual Polarisation Weather Radars Systems Check valueOpen Procedure | Met Eireann | Vaisala Oyj | | €816,438,300 |
| TII400 Luas Operations and Maintenance Contract | Transport Infrastructure Ireland (TII) | Keolis (UK) Limited | | €718,979,302 |
| TII400 Luas Operations and Maintenance ContractCompetitive Procedure With Negotiation | Transport Infrastructure Ireland (TII) | Keolis (UK) Limited | | €718,979,302 |
| 24-018Q-015 Electricity supply: Pool Price PassThru | Uisce Éireann | SSE Airtricity Limited | | €500,000,000 |
| RFT for the provision of Cash Payment ServicesOpen Procedure | Department of Social Protection | An Post | | €261,100,000 |
| 9068 Contract for the Operation and Maintenance of the On Track Machine (OTM) Fleet and Permanent Way Engineering TrainsCompetitive Procedure With Negotiation | Iarnród Eireann-Irish Rail | Rhomberg Sersa Ireland Limited | | €165,000,000 |
| 8729 Supply and Delivery of Level Crossing CCTV Camera PoleCompetitive Procedure With Negotiation | Iarnród Eireann-Irish Rail | Altron Communications | | €145,344,400 |
| ENQEIR966 - DS3 System Services – Volume Uncapped – Gate 13 | EirGrid plc | Sundew Solar Designated Activity Company and 7 others | | €140,500,000 |
| 9337 GSM-R Phase 4 Civils Works Package 2Direct Invite – Mini-Competition | Iarnród Eireann-Irish Rail | Pod-Trak Infrastructure Limited | | €129,992,647 |
| MP2 Works at Berth 52 and 53 at Dublin Port | Dublin Port Company | Wills Bros Limited | | €128,706,500 |
| Provision of supply of Natural Gas to the HSE and Health SectorDirect Invite – Mini-Competition | The Office of Government Procurement | Bord Gais Energy Limited | | €124,714,946 |
| Stand Alone Contract Award Notice for Tyndall North | University College Cork | John Sisk & Son (Holdings) Limited | | €111,989,689 |
| Provision of electricity Supply for the Government Departments and Security Services UEL005F 32 | The Office of Government Procurement | Energia | | €103,520,982 |
| Aggregated Mini-Competition (AMC), under DPS, for the Provision of Natural Gas Supply to the HSE and Health Sector UGF016F-2Direct Invite – Mini-Competition | The Office of Government Procurement | Bord Gais Energy Limited | | €101,869,580 |
| Aggregated Mini-Competition (AMC), under DPS, for the Provision of Natural Gas Supply to the Education Sector UGF016F-3Direct Invite – Mini-Competition | The Office of Government Procurement | SSE Airtricity Limited | | €94,208,697 |
| Stand Alone CAN for CFT 3167264 - Development Agreement with Stage Payments-DDB - Social Housing Schemes in Dublin 2024 Lot 4 | Clúid Housing Association | Castlethorn Developments Luttrellstown Limited | | €91,511,060 |
| Provision of Microsoft LSP ServicesDirect Invite – Mini-Competition | Office of the Revenue Commissioners | CDW Limited | | €85,972,481 |
| Provision of Electricity Supply to the Government Agencies and Bodies in IrelandDirect Invite – Mini-Competition | The Office of Government Procurement | Electric Ireland | | €85,133,810 |
| Call for tenders for the provision of hot meals under the school meals scheme to St Patrick's NS 16672P Check value | St Patrick's National School (Letterkenny) 16672P | School Lunches Catering Limited | | €75,129,600 |
| 9365 (9096-19) OBE53 Waterproofing and Stitching Check valueDirect Invite – Mini-Competition | Iarnród Eireann-Irish Rail | Triur Construction Limited | | €75,000,000 |
| 9024 Maintenance of the 38kV equipment in Traction SubstationsCompetitive Procedure With Negotiation | Iarnród Eireann-Irish Rail | Tli Group Limited | | €69,272,843 |
| T.077/2025 Request for Tenders for the establishment of Contract for the provision of Application Support and Project Delivery services, for An Garda Síochána | An Garda Síochána | Accenture Limited | | €69,000,000 |
| Temperature Controlled Supply Chain Management Services | Health Service Executive (HSE) | United Drug Distributors Ireland Limited | | €69,000,000 |
| Call for Tender for the provision of hot school meals freshly prepared on site under the School Meals Scheme to O'Growney NS 17623HOpen Procedure | O'Growney National School | The School Food Company Limited | | €67,791,360 |
| Provision of Electricity Supply to Primary and Secondary Schools UEL005F - 34 | The Office of Government Procurement | Electric Ireland | | €67,735,257 |