| Trac HLM Limited | Administrative & support | 2009 |
| Trac International Limited | Administrative & support | 1999 |
| Trac OIL & GAS Limited | Administrative & support | 2009 |
| Trace Learning Solutions Ltd | Professional & scientific | 2014 |
| Tracewood Engineers Ltd | Professional & scientific | 2022 |
| Trackgenesis Limited | Information & communication | 2019 |
| Trackpack Global Ltd | Information & communication | 2025 |
| Tracs Assets Limited | Information & communication | 2006 |
| Tracs International Limited | Mining & quarrying | 1997 |
| Trade ASC Limited | Wholesale & retail | 2019 |
| Trade Secrets (U.K) Limited | Wholesale & retail | 2018 |
| Tradebe Healthcare (South West) Limited | Administrative & support | 2006 |
| Trader KAI Limited | Wholesale & retail | 2021 |
| Traill Consulting Limited | Administrative & support | 2003 |
| Tramonte LP | | 2015 |
| Tranquility Massage Therapy Limited | Health & social care | 2019 |
| Trans Asia Energy Services (UK) Ltd | Mining & quarrying | 2019 |
| Trans NV Solutions Ltd | Wholesale & retail | 2022 |
| Transform to Zero Ltd | Professional & scientific | 2023 |
| Transformologyxr Ltd | Information & communication | 2020 |
| Transformu Coaching Ltd | Other services | 2026 |
| Transition Extreme Sports Limited | Arts & recreation | 2005 |
| Transition Technology Centre Limited | Professional & scientific | 2020 |
| Transocean Drilling U.K. Limited | Other services | 1991 |
| Transocean Onshore Support Services Limited | Mining & quarrying | 2001 |
| Transom Limited | Hospitality | 2010 |
| Traveline Scotland Limited | Information & communication | 2000 |
| Travelstock (Packaging) Limited | Wholesale & retail | 1980 |
| TRC Consulting (UK) Limited | Professional & scientific | 2013 |
| Tread SPY Ltd | Information & communication | 2024 |
| Treasure School of Music Limited | Arts & recreation | 2025 |
| Treasurebase Ltd | Health & social care | 2023 |
| Treehouse Properties Aberdeen Limited | Real estate | 2014 |
| Treespark Development Co Ltd | Real estate | 2015 |
| Trek Adventure Van Ltd | Professional & scientific | 2019 |
| Trekken Technical Ltd | Professional & scientific | 2022 |
| Trend Node Ltd | Wholesale & retail | 2025 |
| Trend Productions Limited | Information & communication | 2007 |
| Trendsetter Subsea UK Ltd | Professional & scientific | 2026 |
| Trendy Hair Studio Ltd | Other services | 2017 |
| Trendytoque Ltd | Wholesale & retail | 2024 |
| Trex Services Ltd | Professional & scientific | 2018 |
| TRI Polar Limited | Wholesale & retail | 2019 |
| Tri-Milk Ltd | Manufacturing | 2025 |
| Triamp Limited | Professional & scientific | 2012 |
| Triana NET LP | | 2015 |
| Tribus (Strategic Business Services) Ltd | Professional & scientific | 2026 |
| Tricker Communications Ltd | Professional & scientific | 2001 |
| Trini Vybz Ltd | Hospitality | 2025 |
| Trinity Exploration & Production (UK) Limited | Administrative & support | 2011 |
| Trinity Hair Aberdeen Limited | Other services | 2003 |
| Trinity Hall Catering Limited | Hospitality | 2011 |
| Trinity International Services Limited | Hospitality | 1990 |
| Trinity Kerr Limited | Professional & scientific | 2015 |
| Trinity Premier Services Ltd | Administrative & support | 2025 |
| Trinomial Solutions Ltd | Professional & scientific | 2010 |
| Trip to Grow Ltd | Professional & scientific | 2022 |
| Trip Wise Limited | Administrative & support | 2021 |
| Triple a Property Solutions Ltd | Real estate | 2026 |
| Triple INK Ltd | Arts & recreation | 2022 |
| Triple J Dembo Limited | Professional & scientific | 2020 |
| Triple MC Limited | Administrative & support | 2022 |
| Tripple-D Real Estate Ltd | Real estate | 2022 |
| Triscape Limited | Arts & recreation | 2015 |
| Trisci Builders Ltd | Construction | 2024 |
| Triton Marine & Engineering Consultants Limited | Mining & quarrying | 2017 |
| Triton Marine Services Limited | Mining & quarrying | 2018 |
| Triton Software Ltd | Administrative & support | 2009 |
| Triumph Cleaning Limited | Administrative & support | 2020 |
| Trog Media Ltd | Information & communication | 2026 |
| Trojan Cases Ltd | Professional & scientific | 2011 |
| Trojan Crates Holdings Limited | Administrative & support | 2024 |
| Trojan Crates Limited | Other services | 1979 |
| Trophies International Ltd. | Manufacturing | 2001 |
| Tropical Marine Aberdeen Ltd | Agriculture & fishing | 2019 |
| Troubadour Management Limited | Real estate | 2023 |
| TRT Engineering Limited | Professional & scientific | 2013 |
| True North (Scotland) Limited | Professional & scientific | 2020 |
| True North Integrated Solutions Ltd | Professional & scientific | 2025 |
| True North Marine Ltd | Mining & quarrying | 2019 |
| True Stories Events Ltd | Professional & scientific | 2025 |
| Truedeal Securities Limited | Professional & scientific | 1973 |
| Truedge Digital Ltd | Information & communication | 2026 |
| Truffelos Ltd | Manufacturing | 2014 |
| Trusted Real World Assets Ltd | Financial services | 2025 |
| Trustpro Consulting Ltd | Construction | 2025 |
| TSA Newsagent Ltd | Wholesale & retail | 2023 |
| Tserv Limited | Professional & scientific | 2018 |
| TSG Business Services Ltd | Professional & scientific | 2023 |
| TSL Aberdeen Ltd | Professional & scientific | 2018 |
| TSM Investment Limited | Extraterritorial | 2012 |
| TT Engineering Ltd | Professional & scientific | 2021 |
| TT Inspection Ltd | Mining & quarrying | 2024 |
| TTF Therapy Ltd | Health & social care | 2021 |
| TTT Subsurface Ltd | Professional & scientific | 2025 |
| TU Home Limited | Real estate | 2020 |
| Tubular International Consultants UK Limited | Other services | 2016 |
| Tucara Ltd | Information & communication | 2022 |
| Tudor House Publishers Ltd | Information & communication | 2021 |
| Tulloch Recruitment (Aberdeen) Limited | Administrative & support | 1993 |