| Phostyx Limited | Information & communication | 2011 |
| Pioneer Software Ltd | Information & communication | 1998 |
| Playdays Play Equipment Ltd | Manufacturing | 2025 |
| Port Evolution Management Limited | Professional & scientific | 2009 |
| Precision ATM Limited | Transport & logistics | 2001 |
| Proctor and SON Properties Limited | Transport & logistics | 1981 |
| Procurement Expertise Limited | Hospitality | 2017 |
| Projects Energised Ltd | Professional & scientific | 2024 |
| Quadzilla INT Limited | Wholesale & retail | 2023 |
| Quadzilla Limited | Wholesale & retail | 2006 |
| Quids in Competitions Ltd | Other services | 2026 |
| R and J Scaffolding Lincs Ltd | Construction | 2023 |
| R Hutton Plumbing & Heating Limited | Construction | 2011 |
| R, E & L Thurlow Ltd | Agriculture & fishing | 2002 |
| R. Davis Plumbing and Heating Limited | Construction | 2021 |
| R.G.W.Services(Lincs) Ltd | Manufacturing | 2011 |
| R.P.A. (Lincolnshire) Limited | Wholesale & retail | 1999 |
| Rawdon Tyres & Auto Centre Ltd | Wholesale & retail | 2021 |
| RAY Larrington Hydraulics (Brothertoft) Limited | Manufacturing | 1997 |
| RECYCLING4YOU Limited | Water & waste | 2008 |
| Reemar Construction Limited | Construction | 2022 |
| Remote Check-In Limited | Information & communication | 2020 |
| Revesby Country Fair | Arts & recreation | 2019 |
| Reward Virtual Services Limited | Administrative & support | 2019 |
| RGA Consultancy Limited | Professional & scientific | 2009 |
| Richard Williams Engineering Limited | Manufacturing | 2007 |
| RM217 Limited | Financial services | 2017 |
| Robec Limited | Other services | 2008 |
| Robert Bell & Company Limited | Real estate | 2010 |
| Robinsons Heating and Boiler Care Limited | Construction | 2023 |
| Roofing Remedies Limited | Construction | 2023 |
| Rosewood Residents Management Limited | Households | 2006 |
| RP Construction Consultancy Ltd | Professional & scientific | 2022 |
| S B Construction (Lincs) Ltd | Construction | 2017 |
| S J G Homes Horncastle Ltd | Construction | 2021 |
| S K Bibby & SON Ltd | Construction | 2026 |
| S Lowe Property Ltd | Households | 2025 |
| S R Kilby Machinery Ltd | Wholesale & retail | 2025 |
| S&M T6 Triumph Spitfire LE Mans Ltd | Wholesale & retail | 2014 |
| S. a. Spooner Limited | Construction | 2013 |
| S.P.A Construction Limited | Construction | 2018 |
| Sach Avro Ltd | Financial services | 1987 |
| Safe and Sound Security Systems (Links) Ltd | Manufacturing | 2009 |
| Sandy Acre Properties Ltd | Hospitality | 2020 |
| Scarborough Inn’S Limited | Hospitality | 2025 |
| Scarletts Parrot Essentials Limited | Wholesale & retail | 2011 |
| Scattear Competitions Ltd | Other services | 2022 |
| Scrivelsby Biomass Limited | Energy | 2013 |
| Scrivelsby Farms Limited | Agriculture & fishing | 1993 |
| SDL Training Services Limited | Education | 2016 |
| Sealpine Limited | Households | 1988 |
| Senjie E-Commerce Internet Sales Co., Ltd | Wholesale & retail | 2025 |
| Sepal Consultancy Limited | Administrative & support | 2013 |
| Shaun Lindley Limited | Construction | 2008 |
| Shear Training & Consultancy Ltd | Professional & scientific | 2018 |
| Shinn Developments Limited | Construction | 2014 |
| Shiregreen Properties Limited | Extraterritorial | 2015 |
| Sier Ltd | Real estate | 2020 |
| Silvanus Place Limited | Real estate | 2024 |
| Silverline Scaffolding (Lincs) Ltd | Construction | 2012 |
| Skeet Print Limited | Manufacturing | 2008 |
| Sleaford Motor Company Limited | Financial services | 2016 |
| Smart DESIGNSS11 Ltd | Professional & scientific | 2025 |
| Something That Sparkles Limited | Wholesale & retail | 2005 |
| Sonicbridge Limited | Hospitality | 1989 |
| South Wold Kennels Ltd | Agriculture & fishing | 2024 |
| Spectacle Image Ltd | Other services | 2014 |
| Sprint Signs Limited | Manufacturing | 1999 |
| Squirrel Lodge Centre Limited | Professional & scientific | 2012 |
| Stainsby House Farm Ltd | Agriculture & fishing | 2014 |
| Statheby Court Limited | Households | 2004 |
| Stephenson Trapmore Construction Ltd | Construction | 2017 |
| Stourton Estates Holdings Limited | Financial services | 2024 |
| Stourton Estates Limited | Agriculture & fishing | 2013 |
| Stourton Properties Holdings Limited | Financial services | 2024 |
| Stourton Properties Limited | Real estate | 1989 |
| Stronghold Estate Planning Limited | Professional & scientific | 2024 |
| Sturton Property Limited | Real estate | 2024 |
| Sunset Escapes Horsington Ltd | Hospitality | 2021 |
| Surprise Shirts Ltd | Wholesale & retail | 2020 |
| T J & a G Ltd | Agriculture & fishing | 2014 |
| T. C. Bryant Limited | Financial services | 2010 |
| T.B. Harrison and Sons Limited | Financial services | 1976 |
| Tagg Farms Ltd | Agriculture & fishing | 2014 |
| Taylor Ventures Ltd | Professional & scientific | 2026 |
| Taylor Williams Associates Limited | Households | 2002 |
| TDF Automotive Solutions Ltd. | Professional & scientific | 2025 |
| Tennis Buddies Limited | Arts & recreation | 2002 |
| Tentorium Limited | Agriculture & fishing | 2002 |
| Terracvita Group Ltd | Information & communication | 2023 |
| Terracvita Limited | Information & communication | 2023 |
| Terrasciences Limited | Information & communication | 2024 |
| TH Management Limited | Households | 2003 |
| THE Allotment Cook Limited | Information & communication | 2023 |
| THE Billy English Way Management Company Limited | Households | 2020 |
| THE Firs Management Company (Mablethorpe) Limited | Households | 1990 |
| THE Gables (Hundleby) Management Company Ltd | Households | 2019 |
| THE Good Spud Ltd | Hospitality | 2026 |
| THE Grapevine (Lincs) Limited | Other services | 2009 |
| THE Gym Horncastle Ltd | Arts & recreation | 2017 |