- iDAQ - sheffield
- Ideal Envelopes Ltd - Sheffield
- Illuminaries Ltd - Sheffield
- IMES International - Sheffield
- IMM Ltd - Sheffield
- Impact Carbides Ltd - Sheffield
- Independent Forgings & Alloys Ltd - Sheffield
- Independent Forgings and Alloys Ltd - Sheffield
- Independent Safety Services Ltd - Sheffield
- Inductelec - Sheffield
- Inflecto Systems - Sheffield
- Infraglo Sheffield Ltd - Sheffield
- Insight Direct UK - Sheffield
- Insight UK - Sheffield
- Intelligent Energy Saving Ltd - Powerperfector - Sheffield
- Intelligent Facility Solutions Ltd - Sheffield
- Intercast UK Ltd - Sheffield
- Interior Panel Systems - Sheffield
- J A Horne Starlight - Sheffield
- J B Stainless - Sheffield
- J Newsome Tools Ltd - Sheffield
- J R I Orthopaedics - Sheffield
- J S R Precision Engineers - Sheffield
- J. Adams Ltd - Sheffield
- Jackson Engineering - Sheffield
- John Owen Aggregates Ltd - Sheffield
- John Street Platers (UK Metal Finishing) - Sheffield
- Johnson & Allen Ltd - Sheffield
- Joseph Marples Ltd - Sheffield
- JT Handtools Ltd - Sheffield
- K Barriers Ltd - Sheffield
- K T G Engineering - Sheffield
- K T R UK Ltd - Sheffield
- Kaye-Dee Marking Solutions Ltd - Sheffield
- Kaymich - Sheffield
- Kelly Plant Hire - Sheffield
- Kelpack Ltd - Sheffield
- Killer Byte Ltd - Sheffield
- KingKraft - Sheffield
- Kinspeed - Sheffield
- Kiveton Park Steel Ltd - Sheffield
- Knight Imaging - Sheffield
- L & T A Group Ltd - Sheffield
- L A N Controls - Sheffield
- La Beeby - Sheffield
- LA Skincare - Sheffield
- Laser Cutting Ceramics Ltd - Sheffield
- Lathco Ltd. - Sheffield
- Lavender International - Sheffield
- Laycock Precision Engineering - Sheffield
Companies 301 to 350
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