| ID | Name | Type |
|---|---|---|
| #749 | Allanson Computing | Z |
| #750 | Allcom | ? |
| #751 | Allen | ? |
| #20216 | Allen Adham | + |
| #752 | Allen Doe | + |
| #753 | Allen Hardy | + |
| #754 | Allen Lane | + |
| #755 | Allen Pendle | + |
| #16049 | Allen Webb | + |
| #756 | Allen Wolach | + |
| #757 | Alliance Team | Z |
| #758 | Alligata Software Ltd | P |
| #759 | Allison & Busby | Z |
| #760 | Allison Kerr | + |
| #761 | Allistair Watt | + |
| #762 | Allister Brimble | + |
| #763 | Ally Noble | ? |
| #764 | Alma-Press | Z |
| #765 | Almaro | ? |
| #766 | Almart | Z |