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| NYIIX | NYN | NYP | NYSIA | NYU | NZR |
| O | O-MaSE | O2I | OA | OAA | OAC |
| OAD | OAE | OAF | OAG | OAI-PMH | OAK |
| OAL | OAM | OAM&P | OAMP | OAOT | OAR |
| OARS | OAS | OASIS | OAT | OATH | OAuth |
| OAV | OAW | OAZ | OB | OBA | OBB |
| OBD | OBDD | OBF | OBH | OBI | OBIEE |
| OBJ | OBM | OBN | OBNM | OBO | OBOE |
| OBP | OBR | OBS | OBSAI | OBSN | OBT |
| OBV | OBZ | OC | OC-1 | OC-12 | OC-3 |
| OC-48 | OC-n | OCA | OCAP | OCASE | OCB |
| OCC | OCD | OCE | OCF | OCFS | OCI |
| OCL | oclock | OCM | OCN | OCP | OCR |
| OCS | OCSG | OCSI | OCT | OCU | OCUR |
| OCWN | OCX | OD | ODA | ODAA | ODAT |