| Euro Electronic Security Ltd | 028 7134 4770 | | 39 Clooney Terrace, Londonderry, BT47 6AP |  Map & Directions |
| Foyle Security Systems | 028 7181 2185 | | 8 Mclean Road, Campsie Industrial Estate, Eglinton, Londonderry, BT47 3XX | | Map & Directions |
| Medway Security Distribution | 028 9077 7600 | | 41 Duncrue Crescent, Belfast, BT3 9BW | | Map & Directions |
| Protec Security Systems Ltd | 028 9267 7700 | | 137A Hillsborough Old Road , Lisburn, BT27 5QE | | Map & Directions |
| Electronic & Security Services | 028 9066 3510 | | 50belcher Place Place, Belfast, BT12 6AT | | Map & Directions |
| Guard Force Ltd | 028 2766 6540 | | 28-30 Glenlough Road, Ballymoney, BT53 7HB | | Map & Directions |
| Premier Security Systems | 07802 217442 | | 23a Credenhill Park, Dunmurry, Belfast, BT17 0ES | | Map & Directions |
| Initial Shorrock Security | 028 9045 9441 | | 213 Castlereagh Road, Belfast, BT5 5FH | | Map & Directions |
| Electronic & Security Services Ltd | 028 9066 1583 | | 50 Boucher Place , Belfast, BT12 6HT | | Map & Directions |
| Corps Of Commissionaires Management Ltd | 028 9023 0031 | | 9-13 Waring Street, Belfast, BT1 2DX | | Map & Directions |
| Special Events Ltd | 028 9024 4613 | | Washington House, 14-16 High Street, Belfast, BT1 2BD | | Map & Directions |
| Ensign Security | 028 9084 4005 | | 3 St. Quentin Park, Newtownabbey, BT36 6JB | | Map & Directions |
| Video Security Solutions Ltd | 028 9066 3919 | | 16-18 Lower Windsor Avenue, Belfast, BT9 7DW | | Map & Directions |
| Maybin Security & Guarding Services | 028 9077 0077 | | 6 Edgewater Road, Belfast, BT3 9JQ | | Map & Directions |
| Greenhills Security Products Ni Ltd | 028 9037 0030 | | 18a Duncrue Crescent, Belfast, BT3 9BW | | Map & Directions |
| B H P Alarms | 028 7126 2757 | | Unit B3 Balliniska Business Park Springtown Industrial Estate, Springtown Road, Londonderry, BT48 0LY | | Map & Directions |
| King Security | 028 3085 1251 | | 4 Bavan Villas, Mayobridge, Newry, BT34 2HD | | Map & Directions |
| Parking Access Service Systems Ltd | 028 9145 4453 | | Enterprise House , 2-4 Balloo Avenue , Bangor, BT19 7QT | | Map & Directions |
| Mid Ulster Security | 028 7946 9911 | | 48 Lurganagoose Road, Knockloughrim, Magherafelt, BT45 8QY | | Map & Directions |
| Radiocontact Ltd | 028 9040 1742 | | 37 Montgomery Road, Belfast, BT6 9HL | | Map & Directions |
| Brinks Allied Ltd | 028 9077 3442 | | 28-30 Duncrue Road, Belfast, BT3 9BP | | Map & Directions |
| Cobra Specialist Security Services | 028 9083 2383 | | Unit 9 Building 4, Central Park Mallusk, Newtownabbey, BT36 4FS | | Map & Directions |
| Pegasus Security Group | 028 9092 3331 | | Wellington Park, Belfast, BT9 6DJ | | Map & Directions |
| Estate Services Ltd | 028 7126 7268 | | 1 Iona Park, Londonderry, BT48 9LH | | Map & Directions |
| Spa Security Solutions | 028 9756 1065 | | 8 Spa Road, Ballynahinch, BT24 8LU | | Map & Directions |
| Adt Fire & Security Ltd | 028 7126 3626 | | 20 Springrowth, Springtown Road, Londonderry, BT48 0LY | | Map & Directions |
| B & E Security Systems | 028 7082 5119 | | 10 Oakland Avenue, Portrush, BT56 8JP | | Map & Directions |
| Securicor Ltd | 028 9038 1430 | | 1 Mallusk Road, Blackwater Business Park, Newtownabbey, BT36 4AA | | Map & Directions |
| N D S Systems Ltd | 028 9145 6014 | | Enterprise House, 2-4 Balloo Avenue , Bangor, BT19 7QT | | Map & Directions |
| 1st Alert Alarm Systems | 028 8778 9669 | | 44a Rhone Road, Dungannon, BT71 7EN | | Map & Directions |
| Gardiner Security Ltd | 028 9068 2994 | | Unit 6 Enterprise House, Boucher Place, Belfast, BT12 6HT | | Map & Directions |
| T M W Security Services | 028 3082 1111 | | 16 Latt Road , Newry, BT35 6PB | | Map & Directions |
| Checkmate Guarding | 028 9260 4850 | | 75 Young Street, Lisburn, BT27 5EA | | Map & Directions |
| North Sec Security Services Ltd | 028 7126 6113 | | 1 Bay Road, Londonderry, BT48 7SH | | Map & Directions |
| Star Security | 028 7083 4863 | | 3 Swilly Park, Portstewart, BT55 7FL | | Map & Directions |
| Mallusk Security Services Ltd | 028 9047 1394 | | 495 Upper Newtownards Road, Belfast, BT4 3LL | | Map & Directions |
| Xenon Security | 028 9062 5988 | | Trossachs Gardens, Belfast, BT10 0HX | | Map & Directions |
| Atm Securities | 07979 083353 | | 48 Eglinton Street , Portrush, BT56 8DY | | Map & Directions |
| Adt Fire & Security | 028 6632 2472 | | Enniskillen Business Centre, Tempo Road, Enniskillen, BT74 6HR | | Map & Directions |
| Age Concern Enterprise N I Ltd | 028 9023 3341 | | 10 College Street , Belfast, BT1 6BT | | Map & Directions |
| C I A Excel | 028 9053 0160 | | Unit, Carrowreagh Road, Dundonald Enterprise Park, Dundonald, Belfast, BT16 1QT | | Map & Directions |
| Rf Concepts | 028 9041 9596 | | Unit C16, Carrowreagh Road, Dundonald Enterprise Park, Dundonald, Belfast, BT16 1QT | | Map & Directions |
| K G B Alarms | 028 4278 8249 | | 9b Cardy Road, Greyabbey, Newtownards, BT22 2LS | | Map & Directions |
| Central Security Systems | 028 9266 0066 | | 90 Wallace Avenue, Lisburn, BT27 4AE | | Map & Directions |
| Anchor Electronic Security | 028 9756 2029 | | 2 Millbrook Drive, Ballynahinch, BT24 8HQ | | Map & Directions |
| Sword Security Ltd | 028 9050 3040 | | 68 Donegall Pass, Belfast, BT7 1BU | | Map & Directions |
| Protect Security | 028 9182 8059 | | 6 Newtown Close, Newtownards, BT23 7ZH | | Map & Directions |
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