| Tait Europe Ltd | Information & communication | 1979 |
| Taiwan Chaoqun Industry Co., Ltd | Wholesale & retail | 2023 |
| Taiwan Medex Petroleum Group Ltd | Wholesale & retail | 2020 |
| Taiwo Oladokun Ltd | Real estate | 2023 |
| Taiyue International Trade Co., Limited | Mining & quarrying | 2020 |
| Taizhou Changkuan Co., Ltd | Extraterritorial | 2023 |
| Taizhou Chengbo Qihua Import and Export Co., Ltd | Extraterritorial | 2024 |
| Taizhou Liangyuan Toys Co., Ltd. | Extraterritorial | 2018 |
| TAJ @ Cambridge Limited | Wholesale & retail | 2010 |
| TAJ Cambridge Ltd | Hospitality | 2017 |
| TAJ Karamay Ltd | Wholesale & retail | 2024 |
| Taj@Tawa Cambridge Limited | Manufacturing | 2022 |
| Tajinaste Ltd | Real estate | 2025 |
| Taka Digital Limited | Information & communication | 2023 |
| Takeaway Tree Ltd | Wholesale & retail | 2021 |
| Takeba Ltd | Real estate | 2023 |
| Takeda Cambridge Limited | Real estate | 1998 |
| Takhar Collection Services Ltd. | | 2006 |
| Takreem T/A Maharani Limited | Hospitality | 2023 |
| Taldr Limited | Other services | 2016 |
| Talent Forge UA Ltd | Arts & recreation | 2025 |
| Talent Glue Ltd. | Professional & scientific | 2011 |
| Taletex Ltd | Arts & recreation | 2025 |
| Talexi Ltd | Arts & recreation | 2016 |
| Talga Anode UK Limited | Administrative & support | 2020 |
| Talga Technologies Limited | Administrative & support | 2016 |
| Talisker Developments Limited | Administrative & support | 2007 |
| Talisker Limited | Construction | 1997 |
| Talisman Therapeutics Limited | Professional & scientific | 2013 |
| Talkdata Limited | Information & communication | 1983 |
| Talking T'S Limited | Manufacturing | 2010 |
| Talking T'S of Cambridge Limited | Wholesale & retail | 2010 |
| Talking Transformation Limited | Administrative & support | 2013 |
| Talkserve Limited | Information & communication | 2000 |
| Tallen Consulting Ltd | Information & communication | 2025 |
| Talmaciu Petre Catalin Aerospace Ltd | Manufacturing | 2026 |
| Tamara House Freehold Limited | Households | 2008 |
| Tamara Property Development Ltd | Real estate | 2024 |
| Tamarack Aerospace, Ltd. | Administrative & support | 2015 |
| Tamarind Executive Search Limited | Administrative & support | 2013 |
| Tamarind Spice Ltd | Hospitality | 2020 |
| TAMAS1947 Ltd | Manufacturing | 2025 |
| Tamba Trading Co., Ltd | Wholesale & retail | 2024 |
| Tambala Consulting Limited | Information & communication | 2009 |
| Tambo Restaurants Ltd | Hospitality | 2023 |
| Tamedcare Co., Ltd | Wholesale & retail | 2018 |
| TAN ZHI Zhou Co., Limited | Wholesale & retail | 2026 |
| Tanasity Software + Services Limited | Information & communication | 2004 |
| Tane Linton Ltd | Wholesale & retail | 2023 |
| Tanerellas Limited | Other services | 2017 |
| Tanestapleford Limited | Wholesale & retail | 2023 |
| Tangent Telecom Ltd. | Information & communication | 2002 |
| Tangential Cambridge Ltd | Administrative & support | 2025 |
| Tangential Software Limited | Information & communication | 2014 |
| Tangmere Residents Association Limited | Households | 1986 |
| Tangxu Import and Export Co., Ltd | Wholesale & retail | 2025 |
| Tanner & Hall Roofing Ltd | Construction | 2023 |
| Tanpal Limited | Hospitality | 2015 |
| Tantawowa Ltd | Information & communication | 2024 |
| Tantick Ltd. | Information & communication | 2025 |
| TAO Chen Valve Fluid Co., Ltd. | Extraterritorial | 2021 |
| TAO Health and Care Consulting Limited | Education | 2009 |
| TAO Jones Index Ltd | Information & communication | 2018 |
| TAO Living Ltd | Wholesale & retail | 2018 |
| Taofengbo Limited | Agriculture & fishing | 2026 |
| TAP for One Ltd | Wholesale & retail | 2024 |
| TAP Stays Ltd | Real estate | 2025 |
| TAP to Design Ltd | Information & communication | 2024 |
| Taproot Ltd | Professional & scientific | 2019 |
| Taps Food Ltd | Hospitality | 2024 |
| Tarabya Yachting Ltd | Other services | 2026 |
| Taracove UK Limited | Construction | 2022 |
| Tarad Property Limited | Real estate | 2024 |
| Taranos Consulting Ltd | Professional & scientific | 2024 |
| Target International Trading Co., Ltd | Wholesale & retail | 2020 |
| Targo TX Limited | Professional & scientific | 2026 |
| Tarita Holdings Ltd | Information & communication | 2025 |
| Taronina Decorators Ltd | Construction | 2026 |
| Tarraco Holdings Limited | Professional & scientific | 2018 |
| Tarraco Planning Limited | Professional & scientific | 2011 |
| Taruwa Africa Centre CIC | Education | 2023 |
| TAS Car & Van Rentals Ltd | Administrative & support | 2024 |
| Tasa Limited | Health & social care | 2019 |
| Tashi Twaha Ltd | Manufacturing | 2026 |
| Taskline Ltd | Information & communication | 2005 |
| Taste Flavourings Cambridge Limited | Hospitality | 2022 |
| Taste Flavourings Ltd | Manufacturing | 2012 |
| Taste Flavourings UK Holdings Limited | Financial services | 2026 |
| Taste From Hungary Ltd | Wholesale & retail | 2020 |
| Taste From Hungry Ltd | Hospitality | 2024 |
| Taste Maker UK & Eu.Co Ltd | Agriculture & fishing | 2023 |
| Taste That Ltd | Extraterritorial | 2012 |
| Tastier Easier Limited | Information & communication | 2012 |
| Tasty Tempe Limited | Hospitality | 2011 |
| Tatiana Ansell Consultancy Ltd | Professional & scientific | 2026 |
| Tattooing by Fabio Limited | Administrative & support | 2006 |
| Taues Ltd | Water & waste | 2024 |
| Taurus Industry Ltd | Manufacturing | 2015 |
| Taurus Management Consultants Limited | Information & communication | 2013 |
| Taurus Racing Limited | Wholesale & retail | 2026 |