| Shopping Bay Ltd | Wholesale & retail | 2025 |
| Shore Comms Ltd | Professional & scientific | 2021 |
| Shore Porters Trustees Limited | Financial services | 2025 |
| Shortday Limited | Administrative & support | 1993 |
| Showequip Limited | Arts & recreation | 2017 |
| SHR (Aberdeen) Limited | Real estate | 2016 |
| Shrisri Engineering Ltd | Professional & scientific | 2011 |
| Shriyuvi Ltd | Information & communication | 2025 |
| Shukla Properies Ltd | Real estate | 2022 |
| Shukur Property Limited | Real estate | 2020 |
| Shun LI Aberdeen Limited | Hospitality | 2018 |
| SI Services (Aberdeen) Limited | Hospitality | 2019 |
| SIB & Co. E-Commerce Ltd | Wholesale & retail | 2024 |
| Sickhaus Ltd | Wholesale & retail | 2023 |
| Sicmwrx Ltd | Wholesale & retail | 2014 |
| Sideturn Limited | Professional & scientific | 1989 |
| Sidewalk Mart Limited | Wholesale & retail | 2024 |
| Sidings (Aberdeen) Limited | Financial services | 2022 |
| Sidylle Properties Limited | Real estate | 2025 |
| SIE Manta Ltd | Information & communication | 2014 |
| Siejas Ltd | Professional & scientific | 2025 |
| Sight Action Sensory Services Limited | Health & social care | 2000 |
| Sigma Commercial Consulting Limited | Professional & scientific | 2008 |
| Sigma Hair Academy Limited | Education | 2025 |
| Sigma Hair Studio Ltd | Other services | 2023 |
| SIGMA4 Emissions Limited | Administrative & support | 2025 |
| SIGMA4 Group Limited | Administrative & support | 2026 |
| SIGMA4 Limited | Administrative & support | 2025 |
| Sigmawave Solutions Ltd | Professional & scientific | 2024 |
| Sign Company Aberdeen Limited | Manufacturing | 2016 |
| Sign Marketing and Communications Limited | Professional & scientific | 2025 |
| SIGNAL2NOISE Ltd. | Information & communication | 2011 |
| Signalpath Imports Limited | Wholesale & retail | 2025 |
| Signature Enterprises Limited | Real estate | 2003 |
| Signature Pubs Limited | Hospitality | 2006 |
| Sijibomi Limited | Other services | 2026 |
| Silver City Abode Ltd | Real estate | 2024 |
| Silver City Contractors (Electrical) Ltd | Construction | 2020 |
| Silver City Escapes Ltd | Hospitality | 2025 |
| Silver City Launderers Limited | Other services | 2017 |
| Silver City Lettings Limited | Real estate | 2022 |
| Silver City Real Estate Limited | Real estate | 2025 |
| Silver City Services Ltd | Professional & scientific | 2014 |
| Silver FOX Scotland Limited | Wholesale & retail | 2022 |
| Silver Square Solutions (Scotland) Limited | Professional & scientific | 2021 |
| Silver Threads Aberdeen Ltd | Manufacturing | 2021 |
| Silver Tree Home Help Ltd | Health & social care | 2025 |
| Silver Watch Security Ltd | Administrative & support | 2026 |
| Silverback Tea Company Limited | Manufacturing | 2019 |
| Silverburn Properties Limited | Real estate | 1971 |
| Silvercitysol Ltd | Information & communication | 2025 |
| Silverwood Partners Limited Liability Partnership | | 2009 |
| SIM & Linda Ltd | Real estate | 2023 |
| Simatic Europe Limited | Professional & scientific | 2024 |
| Simblox Technologies Limited | Information & communication | 2005 |
| Simeon Care for the Elderly Limited | Health & social care | 1984 |
| Simian Spirits Ltd | Manufacturing | 2025 |
| Simmers (Ardmedden) Limited | Agriculture & fishing | 1991 |
| Simon Clubb Photography Limited | Professional & scientific | 2005 |
| Simon Cousins Media Limited | Professional & scientific | 2018 |
| Simplarity Ltd | Information & communication | 2020 |
| Simple Innovations Ltd | Professional & scientific | 2019 |
| Simple Style Solution Ltd | Other services | 2018 |
| Simplesciencesupplies Ltd | Manufacturing | 2022 |
| Simpliciter DMC Limited | Administrative & support | 2017 |
| Simplify Lets Ltd | Real estate | 2018 |
| Simply Coaching Ltd | Professional & scientific | 2025 |
| Simply Dogs (Edinburgh) Limited | Other services | 2011 |
| Simply Events Decor Ltd | Hospitality | 2023 |
| Simply LET Ltd. | Real estate | 2004 |
| Simply Malts Limited | Wholesale & retail | 2016 |
| Simply Movers Limited | Transport & logistics | 2015 |
| Simply Ship Limited | Transport & logistics | 2008 |
| Simurg BS Ltd | Wholesale & retail | 2025 |
| SIN Fung Development Co. Limited | | 2023 |
| Sinay Ltd | Financial services | 2025 |
| Sinclair Agricultural & Recycling Services Limited | Administrative & support | 2008 |
| Sinclair Bay Subsea Limited | Professional & scientific | 2011 |
| Sinclair FAB Ltd | Manufacturing | 2024 |
| Sinclair Marine Limited | Administrative & support | 2010 |
| Sinclair School of Highland Dancing Limited | Education | 2015 |
| Sinclair Smith HR Limited | Administrative & support | 2021 |
| Sine Cera Solutions Ltd. | Other services | 2005 |
| Singer Contractors Ltd | Wholesale & retail | 2016 |
| Singer Property Solutions Ltd | Real estate | 2022 |
| Singh Engineering Solutions Ltd | Other services | 2010 |
| Singla Family Dental Limited | Health & social care | 2012 |
| Single Estate Spirits Ltd | Manufacturing | 2016 |
| Single Malts Limited | Wholesale & retail | 2005 |
| Sinha Consultants Limited | Professional & scientific | 2018 |
| Sinomine Specialty Fluids Limited | Professional & scientific | 2003 |
| Siorc Consulting Ltd | Professional & scientific | 2024 |
| SIP IT (Scotland) Limited | Manufacturing | 2021 |
| SIP N Paint Kulture Ltd | Arts & recreation | 2024 |
| Siqiu Handmade Ltd | Wholesale & retail | 2018 |
| Siranks Consult Ltd | Administrative & support | 2024 |
| Siri Landmarks Limited | Construction | 2024 |
| Sirius GL Ltd | Agriculture & fishing | 2017 |
| Sirius Group Limited | Wholesale & retail | 2020 |
| Sirius Impex LP | | 2013 |