| Chief Security Systems | 028 9042 3042 | | 222 Bangor Road , Holywood, BT18 0JF |  Map & Directions |
| Securicor Ltd | 028 9038 1430 | | 1 Mallusk Road, Blackwater Business Park, Newtownabbey, BT36 4AA | | Map & Directions |
| Spa Security Solutions | 028 9756 1065 | | 8 Spa Road, Ballynahinch, BT24 8LU | | Map & Directions |
| C I A Excel | 028 9053 0160 | | Unit, Carrowreagh Road, Dundonald Enterprise Park, Dundonald, Belfast, BT16 1QT | | Map & Directions |
| Xenon Security | 028 9062 5988 | | Trossachs Gardens, Belfast, BT10 0HX | | Map & Directions |
| Orbis Property Protection | 028 9077 1701 | | 22-26 Duncrue Road, Belfast, BT3 9BP | | Map & Directions |
| Greenhills Security Products Ni Ltd | 028 9037 0030 | | 18a Duncrue Crescent, Belfast, BT3 9BW | | Map & Directions |
| South Antrim Alarms Ltd | 028 9267 5568 | | Unit 6, 10 Graham Gardens, Lisburn, BT28 1XE | | Map & Directions |
| Premier Security Systems | 07802 217442 | | 23a Credenhill Park, Dunmurry, Belfast, BT17 0ES | | Map & Directions |
| Phoenix Security Business Management Services Ltd | 028 4062 8258 | | 46 Huntly Road, Banbridge, BT32 3BJ | | Map & Directions |
| N D S Systems Ltd | 028 9145 6014 | | Enterprise House, 2-4 Balloo Avenue , Bangor, BT19 7QT | | Map & Directions |
| Initial Shorrock Security | 028 9045 9441 | | 213 Castlereagh Road, Belfast, BT5 5FH | | Map & Directions |
| Maybin Security & Guarding Services | 028 9077 0077 | | 6 Edgewater Road, Belfast, BT3 9JQ | | Map & Directions |
| Guard Force Ltd | 028 2766 6540 | | 28-30 Glenlough Road, Ballymoney, BT53 7HB | | Map & Directions |
| Atm Securities | 07979 083353 | | 48 Eglinton Street , Portrush, BT56 8DY | | Map & Directions |
| Mercury | 028 9081 3030 | | Unit 20 Edgar Industrial Estate, Comber Road, Carryduff, Belfast, BT8 8AN | | Map & Directions |
| Sword Security Ltd | 028 9050 3040 | | 68 Donegall Pass, Belfast, BT7 1BU | | Map & Directions |
| Loxsit | 028 9045 6554 | | 142-148 Albertbridge Road, Belfast, BT5 4GS | | Map & Directions |
| Pegasus Security Group | 028 9092 3331 | | Wellington Park, Belfast, BT9 6DJ | | Map & Directions |
| Special Events Ltd | 028 9024 4613 | | Washington House, 14-16 High Street, Belfast, BT1 2BD | | Map & Directions |
| Checkmate Guarding & Security | 028 9260 4850 | | 11b Waterside, Coleraine, BT51 3DP | | Map & Directions |
| B H P Alarms | 028 7126 2757 | | Unit B3 Balliniska Business Park Springtown Industrial Estate, Springtown Road, Londonderry, BT48 0LY | | Map & Directions |
| B & E Security Systems | 028 7082 5119 | | 10 Oakland Avenue, Portrush, BT56 8JP | | Map & Directions |
| Rf Concepts | 028 9041 9596 | | Unit C16, Carrowreagh Road, Dundonald Enterprise Park, Dundonald, Belfast, BT16 1QT | | Map & Directions |
| B M F Systems | 028 9050 4133 | | 21 Mallusk Drive, Mallusk Enterprise Park, Newtownabbey, BT36 4GN | | Map & Directions |
| Video Security Solutions Ltd | 028 9066 3919 | | 16-18 Lower Windsor Avenue, Belfast, BT9 7DW | | Map & Directions |
| T M W Security Services | 028 3082 1111 | | 16 Latt Road , Newry, BT35 6PB | | Map & Directions |
| 1st Alert Alarm Systems | 028 8778 9669 | | 44a Rhone Road, Dungannon, BT71 7EN | | Map & Directions |
| F S P Alarms | 028 2766 5557 | | 2 Market Street, Silversprings Shopping Centre, Ballymoney, BT53 6RD | | Map & Directions |
| Euro Electronic Security Ltd | 028 7134 4770 | | 39 Clooney Terrace, Londonderry, BT47 6AP | | Map & Directions |
| Access Video Projects | 028 4484 2685 | | 37 Ballybrannagh Road , Downpatrick, BT30 7HF | | Map & Directions |
| G D I Security | 028 3025 0833 | | 55a Derryleckagh Road, Newry, BT34 2NL | | 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 |
| Digital Fire & Security | 028 9266 1555 | | 41 Ballymullan Road , Lisburn, BT27 5PJ | | Map & Directions |
| Parking Access Service Systems Ltd | 028 9145 4453 | | Enterprise House , 2-4 Balloo Avenue , Bangor, BT19 7QT | | Map & Directions |
| Anchor Electronic Security | 028 9756 2029 | | 2 Millbrook Drive, Ballynahinch, BT24 8HQ | | Map & Directions |
| Radiocontact Ltd | 028 9040 1742 | | 37 Montgomery Road, Belfast, BT6 9HL | | Map & Directions |
| Electronic & Security Services Ltd | 028 9066 1583 | | 50 Boucher Place , Belfast, BT12 6HT | | Map & Directions |
| B S S | 028 9062 8867 | | Unit 16 Work West Enterprise Centre, 301 Glen Road, Andersonstown, Belfast, BT11 8BU | | Map & Directions |
| Delta Communications | 028 9049 1212 | | 6 Knockbreda Park, Belfast, BT6 0HB | | Map & Directions |
| K G B Alarms | 028 4278 8249 | | 9b Cardy Road, Greyabbey, Newtownards, BT22 2LS | | Map & Directions |
| Age Concern Enterprise N I Ltd | 028 9023 3341 | | 10 College Street , Belfast, BT1 6BT | | Map & Directions |
| Checkmate Guarding | 028 9260 4850 | | 75 Young Street, Lisburn, BT27 5EA | | Map & Directions |
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