| 5 | Happy Hols Ltd | School/college/university | North Northamptonshire | NN6 0ND |
| 5 | Hatton Academies Trust At Earls Barton Infant Sch. | School/college/university | North Northamptonshire | NN6 0ND |
| 5 | Hatton Academies Trust At Earls Barton Jnr School | School/college/university | North Northamptonshire | NN6 0ND |
| Awaiting | Henrys Farm Produce | Manufacturers/packers | West Northamptonshire | NN6 6NX |
| Awaiting | Her.9 | Manufacturers/packers | West Northamptonshire | NN6 |
| 5 | Highgate House | Hotel/bed & breakfast/guest house | West Northamptonshire | NN6 8NN |
| 5 | Hillcrest Bed And Breakfast | Hotel/bed & breakfast/guest house | North Northamptonshire | NN6 0HQ |
| 5 | Holcot Estates LLP | Farmers/growers | West Northamptonshire | NN6 |
| 5 | Holiday Inn | Hotel/bed & breakfast/guest house | West Northamptonshire | NN6 7XR |
| 5 | Hollowell Sailing Club | Pub/bar/nightclub | West Northamptonshire | NN6 8RJ |
| 3 | Holroyd Howe @ Pitsford School | School/college/university | West Northamptonshire | NN6 9AX |
| 5 | Homes 2 Inspire Ltd | Hospitals/Childcare/Caring Premises | West Northamptonshire | NN6 |
| 5 | Honeywell Bakes | Other catering premises | West Northamptonshire | NN6 |
| 5 | Hope Honey | Retailers - other | North Northamptonshire | NN6 |
| 5 | House of Bakes | Other catering premises | West Northamptonshire | NN6 7RD |
| Awaiting | I Loaf You | Other catering premises | West Northamptonshire | NN6 |
| 5 | Ibis Hotel (Rugby East) | Hotel/bed & breakfast/guest house | West Northamptonshire | NN6 7EX |
| 5 | Impact Food group @ | School/college/university | West Northamptonshire | NN6 8QE |
| 5 | Indian Lodge | Restaurant/Cafe/Canteen | West Northamptonshire | NN6 7TP |
| Awaiting | Iona & Mousey's Sweets | Retailers - other | West Northamptonshire | NN6 |
| 5 | Issi's Fine Foods | Other catering premises | West Northamptonshire | NN6 |
| 5 | J N Dairies | Distributors/Transporters | North Northamptonshire | NN6 9TG |
| Awaiting | JJ business | Other catering premises | West Northamptonshire | NN6 |
| 5 | Jack Speak Wets On Wheels Mobile Bar | Mobile caterer | West Northamptonshire | NN6 |
| 5 | Jeyda Cakes | Other catering premises | North Northamptonshire | NN6 |
| Exempt | Jeyes Chemist | Retailers - other | North Northamptonshire | NN6 0NA |
| 5 | Jj's Kiddycare Llp | Hospitals/Childcare/Caring Premises | West Northamptonshire | NN6 6HF |
| 3 | Jomidar lounge | Pub/bar/nightclub | West Northamptonshire | NN6 8NH |
| Awaiting | Jules Jams | Other catering premises | West Northamptonshire | NN6 |
| 5 | Junction 18 Ices | Mobile caterer | West Northamptonshire | NN6 7SQ |
| 5 | K F Troop & Son | Retailers - other | West Northamptonshire | NN6 9EL |
| 5 | KO Catering | Mobile caterer | West Northamptonshire | NN6 8BE |
| 5 | Kelmarsh Hall | Restaurant/Cafe/Canteen | West Northamptonshire | NN6 9LY |
| 5 | Kingswood Education Catering Ltd | School/college/university | West Northamptonshire | NN6 9JF |
| 5 | Kingswood Education Catering Ltd | School/college/university | West Northamptonshire | NN6 7RE |
| 5 | Kingswood Education Catering Ltd | School/college/university | West Northamptonshire | NN6 7PX |
| 5 | Kingswood Education Catering Ltd At Sywell Primary School | School/college/university | North Northamptonshire | NN6 0AW |
| 5 | Kingswood at East Haddon CEV | Restaurant/Cafe/Canteen | West Northamptonshire | NN6 8DB |
| 5 | Kingswood at Guilsborough Primary | School/college/university | West Northamptonshire | NN6 8PT |
| 5 | Kingswood at Naseby Primary School | School/college/university | West Northamptonshire | NN6 6BZ |
| 5 | Kingswood at Overstone Primary Schoo | School/college/university | West Northamptonshire | NN6 0AG |
| 5 | Kingswood at Pitsford Primary School | School/college/university | West Northamptonshire | NN6 9AU |
| 5 | Kingswood at Spratton Primary School | School/college/university | West Northamptonshire | NN6 8HY |
| 5 | Kingswood at The Bramptons Primary | School/college/university | West Northamptonshire | NN6 8AW |
| 5 | Kingswood at Walgrave Primary School | School/college/university | West Northamptonshire | NN6 9PH |
| 5 | Kingswood at West Haddon Primary | School/college/university | West Northamptonshire | NN6 7AN |
| 5 | Kingswood@Brixworth Primary | School/college/university | West Northamptonshire | NN6 9BG |
| 5 | Knightley Arms | Pub/bar/nightclub | West Northamptonshire | NN6 6LF |
| 5 | LEON | Restaurant/Cafe/Canteen | West Northamptonshire | NN6 7UZ |
| 5 | Lamport Hall | Restaurant/Cafe/Canteen | West Northamptonshire | NN6 9HD |