| SP Gardening and Landscaping Ltd | Administrative & support | 2019 |
| Spartan Online Coaching Ltd | Arts & recreation | 2021 |
| Spartan Performance Consultancy Ltd | Health & social care | 2022 |
| Spartan Performance Ltd | Hospitality | 2014 |
| Spearhead Protection Ltd | Administrative & support | 2025 |
| Specialist Process Systems Ltd | Professional & scientific | 2017 |
| Specsure Opticians (Consett) Limited | Health & social care | 2006 |
| Speedline Tyres Limited | Wholesale & retail | 2003 |
| Spice Venue Catering Ltd | Hospitality | 2016 |
| Spice Venue Remastered Ltd | Hospitality | 2023 |
| SS Kriss Ltd | Wholesale & retail | 2014 |
| SSF Electrical (NE) Ltd | Construction | 2017 |
| Sshgb Ltd | Financial services | 2023 |
| ST Properties North East Ltd | Real estate | 2025 |
| Stacey's Barbers Ltd | Other services | 2022 |
| Stacey's Sensory Cutting Club CIC | Other services | 2025 |
| Staerck Investment Co Limited | Financial services | 2020 |
| Stairlift Express Ltd | Health & social care | 2013 |
| Stanley Engineering Ltd | Energy | 2026 |
| Stanley's Best Bargains Ltd | Wholesale & retail | 2023 |
| Starlight Management Limited | Administrative & support | 2016 |
| Starting Point Consultancy Ltd | Professional & scientific | 2021 |
| Station Developments Limited | Construction | 1991 |
| Stay Limited | Construction | 1998 |
| Staybright Glazing Ltd | Construction | 2026 |
| Steel Town Components Ltd | Manufacturing | 2025 |
| Steel Town Gym Consett Ltd | Arts & recreation | 2020 |
| Steel Town Pizza Ltd | Hospitality | 2023 |
| Steel Town Travel Ltd | Transport & logistics | 2020 |
| Steel Type Cards Ltd | Wholesale & retail | 2026 |
| Steg Roofing Limited | Construction | 2026 |
| Steve Murray Associates Limited | Construction | 2017 |
| Stewart & Pickersgill Electrical Contractors Limited | Construction | 2002 |
| Stewart's Metals Limited | Wholesale & retail | 2025 |
| Straight UP Scaffolding North East Ltd | Construction | 2020 |
| Studio 16 Interiors Limited | Professional & scientific | 2022 |
| Studio 97 Dance Company Ltd | Arts & recreation | 2020 |
| Summer Consett Ltd | Hospitality | 2024 |
| Sunrise Forecourts Ltd | Wholesale & retail | 2021 |
| Supreme Fitness (NE) Ltd | Arts & recreation | 2025 |
| Supreme Takeaway Limited | Hospitality | 2025 |
| Surgical Dynamics Limited | Manufacturing | 2013 |
| Sustain Holdings Ltd | Financial services | 2020 |
| Sustain Landscapes Limited | Construction | 2002 |
| SVR Connect Ltd | Administrative & support | 2020 |
| Svrpower Ltd | Professional & scientific | 2013 |
| SW Construction NE Ltd | Construction | 2011 |
| SW Rope Access Works Limited | Construction | 2018 |
| Sweet and Savoury (North East) Ltd | Hospitality | 2018 |
| Sweet Things Consett Ltd | Hospitality | 2022 |
| Swifty Excavation Ltd | Construction | 2019 |
| Swinburne Horticultural Services Limited | Other services | 2002 |
| SWS Scaffolding 2 Ltd | Construction | 2025 |
| SWS Scaffolding Limited | Construction | 2021 |
| Sycamore Pharmaceuticals Ltd | Wholesale & retail | 2025 |
| Symbolon Limited | Real estate | 2022 |
| T&H Estates Ltd | Real estate | 2020 |
| T.A. and N. White Limited | Real estate | 1982 |
| T.L.C Clothing Ltd | Wholesale & retail | 2010 |
| Tailored Family Support Ltd | Health & social care | 2024 |
| Tailored Vending Ltd | Wholesale & retail | 2025 |
| Talk Durham Limited | Health & social care | 2025 |
| TAN & Cafe Consett Limited | Arts & recreation | 2025 |
| Tan-Go (North East) Limited | Other services | 2009 |
| Tanbrooke Properties Ltd | Real estate | 2025 |
| Tanfield Groundworks Limited | Construction | 2012 |
| Tanning Specialists Ltd | Other services | 2023 |
| Taxus Ecology Limited | Professional & scientific | 2020 |
| Taylor Made Building NE Ltd | Construction | 2026 |
| Tayran Rope Access Welding Ltd | Construction | 2018 |
| TC Murray and Lamb Limited | Professional & scientific | 2005 |
| TCM Conservation & Masonry Ltd | Manufacturing | 2021 |
| TCR Electrical Services Limited | Construction | 2021 |
| Teasdale Inspection Services Ltd | Professional & scientific | 2019 |
| Technik Trading Limited | Wholesale & retail | 2022 |
| Telford Property Management (Consett) Limited | Real estate | 2012 |
| Temple Coaching LLP | | 2014 |
| Templemoyle Ltd | Health & social care | 2016 |
| Terra Steel Consulting Ltd | Construction | 2018 |
| THE Allotment Catering Limited | Hospitality | 2020 |
| THE Arche Group Ltd | Real estate | 2019 |
| THE Athletes' Agency Ltd | Arts & recreation | 2023 |
| THE Big Consett Directory CIC | Other services | 2025 |
| THE Blast Furnace Micropub Limited | Wholesale & retail | 2020 |
| THE Board Room NE Ltd | Arts & recreation | 2024 |
| THE Broad Group NE Ltd | Other services | 2017 |
| THE Busy Squirrel Limited | Education | 2025 |
| THE Castle Group NE Ltd | Health & social care | 2019 |
| THE Chance Editorial Limited | Information & communication | 2024 |
| THE Chop Shop N.E Ltd | Wholesale & retail | 2022 |
| THE Cleaning Fairies of Consett Ltd | Administrative & support | 2025 |
| THE Cleaning Fairy of Consett Limited | Administrative & support | 2017 |
| THE Clearing Circle LLP | | 2019 |
| THE Clipper Club Ltd | Other services | 2020 |
| THE Cobweb Orchestra | Arts & recreation | 2007 |
| THE Condensation Doctor Ltd | Construction | 2025 |
| THE Corney Manor Ltd | Hospitality | 2019 |
| THE Courtroom NE Ltd | Arts & recreation | 2026 |
| THE Dog DEN - North East Ltd | Agriculture & fishing | 2019 |
| THE Filming Company Limited | Administrative & support | 2023 |