| ID | Name | Type |
|---|---|---|
| #17589 | Oron Software | S |
| #10615 | Orpheus Ltd | P |
| #10616 | Orson | ? |
| #10617 | Orson Wylde | + |
| #17590 | Ortec Micro Computers | R |
| #10618 | Ortiz Lora | ? |
| #10619 | Orwin Software | P |
| #17591 | Osaris Computers | M |
| #10620 | Osborne | Z |
| #10621 | Osborne & Associates Inc | Z |
| #10622 | Oscar & Spilberg | Z |
| #10623 | Oscar Amat Caro | + |
| #10624 | Oscar Chamorro | + |
| #10625 | Oscar Domingo | + |
| #10626 | Oscar G. | + |
| #10627 | Oscar Gallego Sendin | + |
| #10628 | Oscar Garcia Cagigas | + |
| #10629 | Oscar Gomez | + |
| #19869 | Oscar Llamas | + |
| #10630 | Oscar Mate Gonzalez | + |