| South Tyneside Council EN | North East | generic | Weekly | Pending | 0 |
| South Yorkshire Fire and Rescue Authority EN | Yorkshire and the Humber | in-tend | Weekly | Today | 1 |
| Southampton Council EN | South East | generic | Weekly | Pending | 0 |
| Southeastconsortium (In-Tend portal) EN | London | in-tend | Weekly | Today | 34 |
| Southend-on-Sea Council EN | East of England | generic | Weekly | Pending | 0 |
| Southern Water Services Limited EN | South East | bravo | Weekly | Today | 16 |
| Southern Water Services Limited EN | South East | bravo | Weekly | Broken | 0 |
| Southwark Council EN | London | generic | Weekly | Pending | 0 |
| Sovereign Network Group EN | South East | in-tend | Weekly | Broken | 0 |
| Spelthorne Council EN | South East | generic | Weekly | Pending | 0 |
| Sport England EN | East Midlands | bravo | Weekly | Broken | 0 |
| St Albans Council EN | East of England | generic | Weekly | Pending | 0 |
| St Edmund's College Cambridge EN | East of England | in-tend | Weekly | Today | 24 |
| St Helens Council EN | North West | generic | Weekly | Pending | 0 |
| St Mary's University, Twickenham EN | London | in-tend | Weekly | Broken | 0 |
| Stafford Council EN | West Midlands | generic | Weekly | Pending | 0 |
| Staffordshire County Council EN | West Midlands | generic | Weekly | Pending | 0 |
| Staffordshire Moorlands Council EN | West Midlands | generic | Weekly | Pending | 0 |
| Stevenage Council EN | East of England | generic | Weekly | Pending | 0 |
| Stirling Council SC | Scotland | generic | Weekly | Pending | 0 |
| Stockport Council EN | North West | generic | Weekly | Pending | 0 |
| Stockton-on-Tees Council EN | North East | generic | Weekly | Pending | 0 |
| Stoke-on-Trent Council EN | West Midlands | generic | Weekly | Pending | 0 |
| Stratford-on-Avon Council EN | West Midlands | generic | Weekly | Pending | 0 |
| Stroud Council EN | South West | generic | Weekly | Pending | 0 |
| Suffolk County Council EN | East of England | generic | Weekly | Pending | 0 |
| Sunderland Council EN | North East | generic | Weekly | Pending | 0 |
| Surrey And Sussex Healthcare Nhs Trust EN | South East | in-tend | Weekly | Broken | 0 |
| Surrey County Council EN | South East | generic | Weekly | Pending | 0 |
| Surrey Heath Council EN | South East | generic | Weekly | 7d ago | 0 |
| Sutton Council EN | London | generic | Weekly | Pending | 0 |
| Swale Council EN | South East | generic | Weekly | 7d ago | 0 |
| Swansea Council WL | Wales | generic | Weekly | Pending | 0 |
| Swindon Council EN | South West | generic | Weekly | Pending | 0 |
| Tameside Council EN | North West | generic | Weekly | Pending | 0 |
| Tamworth Council EN | West Midlands | in-tend | Weekly | Today | 56 |
| Tandridge Council EN | South East | generic | Weekly | Pending | 0 |
| Tees Valley Combined Authority EN | North East | delta | Weekly | Today | 26 |
| Teignbridge Council EN | South West | generic | Weekly | Pending | 0 |
| Tendring Council EN | East of England | generic | Weekly | Pending | 0 |
| Test Valley Council EN | South East | generic | Weekly | Pending | 0 |
| Tewkesbury Council EN | South West | in-tend | Weekly | Today | 6 |
| Thameslink Southern Great Northern Limited (TSGN) EN | London | delta | Weekly | Today | 21 |
| Thanet Council EN | South East | generic | Weekly | Pending | 0 |
| The City of Liverpool College EN | North West | in-tend | Weekly | Broken | 0 |
| The Crown Estate EN | London | in-tend | Weekly | Today | 3 |
| The David Ross Education Trust EN | East Midlands | in-tend | Weekly | Today | 1 |
| The Education Training Collective EN | North East | in-tend | Weekly | Today | 8 |
| The Electoral Commission EN | London | in-tend | Weekly | Today | 1 |
| The Highland Council SC | Scotland | generic | Weekly | Pending | 0 |
| The Hyde Group EN | — | delta | Weekly | Broken | 0 |
| The Industrial Dwellings Society (1885) Ltd EN | London | in-tend | Weekly | Broken | 0 |
| The Mayor and Commonalty and Citizens of the City of London EN | London | bravo | Weekly | Today | 72 |
| The Office of the Police and Crime Commissioner for Hampshire and the Isle of Wight EN | South East | in-tend | Weekly | Today | 7 |
| The Open University EN | South East | in-tend | Weekly | Broken | 0 |
| The Pirbright Institute EN | South East | in-tend | Weekly | Today | 7 |
| The Police & Crime Commissioner for Sussex EN | South East | in-tend | Weekly | Today | 21 |
| The Police and Crime Commissioner for Nottinghamshire EN | East Midlands | atamis | Weekly | Today | 12 |
| The Police and Crime Commissioner for Surrey EN | South East | in-tend | Weekly | Broken | 0 |
| The Police, Fire and Crime Commissioner for Cumbria EN | North West | in-tend | Weekly | Broken | 0 |
| The Police, Fire and Crime Commissioner for Northamptonshire WL | East Midlands | atamis | Weekly | Today | 16 |
| The Riverside Group Limited EN | North West | in-tend | Weekly | Today | 44 |
| The Riverside Group Limited EN | North West | in-tend | Weekly | Broken | 0 |
| The Royal Mint EN | Wales | bravo | Weekly | Broken | 0 |
| The Swaythling Housing Society Ltd (Trading as Abri) EN | South East | in-tend | Weekly | Broken | 0 |
| The Ted Wragg Multi Academy Trust EN | South West | in-tend | Weekly | Broken | 0 |
| The University Of Birmingham EN | West Midlands | in-tend | Weekly | Today | 21 |
| The University Of Cumbria EN | North West | in-tend | Weekly | Broken | 0 |
| The University of Keele EN | West Midlands | in-tend | Weekly | Broken | 0 |
| The West of England Combined Authority EN | South West | atamis | Weekly | Today | 21 |
| Thirteen Housing Group Limited EN | North East | in-tend | Weekly | Today | 24 |
| Three Rivers Council EN | East of England | generic | Weekly | Pending | 0 |
| Thrive Homes Limited EN | East of England | delta | Weekly | Broken | 0 |
| Thurrock Council EN | East of England | in-tend | Weekly | Today | 4 |
| Together Housing Association EN | Yorkshire and the Humber | in-tend | Weekly | Broken | 0 |
| Tonbridge and Malling Council EN | South East | generic | Weekly | Pending | 0 |
| Torbay Council EN | South West | generic | Weekly | Pending | 0 |
| Torfaen Council WL | Wales | generic | Weekly | Pending | 0 |
| Torridge Council EN | South West | generic | Weekly | 35d ago | 10 |
| Tower Hamlets Council EN | London | generic | Weekly | Pending | 0 |