| ID | Name | Type |
|---|---|---|
| #11678 | Prophics Software | Z |
| #11679 | Prosign | ? |
| #17638 | Prosoft | M |
| #11680 | Prospec | ? |
| #11681 | Prospect Software | P |
| #11682 | Prospek Computing Coorperation | Z |
| #11683 | Prospero Software | Z |
| #17639 | Prot Enterprises | S |
| #11684 | Protecnics | ? |
| #11685 | Protein | ? |
| #11686 | Protek Computing Ltd | P |
| #11687 | Proteus Developments | Z |
| #23097 | Proteusy | P |
| #11688 | Protocol | ? |
| #11689 | Protom | ? |
| #11690 | Proton | ? |
| #17640 | Proton Software | S |
| #11691 | Protos Computer Systems | Z |
| #11692 | Proxima Centauri Ltd | Z |
| #11693 | Proxima Software | Z |