| Orion B Ord Shs (FI0009014377-EUR) SWX - SIX Swiss Exchange | |
| Orpea Ord Shs (FR0000184798-EUR) SWX - SIX Swiss Exchange | |
| Osram Licht N Ord Shs (DE000LED4000-EUR) SWX - SIX Swiss Exchange | |
| Outokumpu Ord Shs (FI0009002422-EUR) SWX - SIX Swiss Exchange | |
| Outotec Ord Shs (FI0009014575-EUR) SWX - SIX Swiss Exchange | |
| Oxford Instruments Ord Shs (GB0006650450-GBX) SWX - SIX Swiss Exchange | |
| ON REAL INT-OLD (8563) HKEX - Hong Kong Stock Exchange | |
| OOH Holdings Ltd (8091) HKEX - Hong Kong Stock Exchange | |
| Ocean One Holding Ltd (8476) HKEX - Hong Kong Stock Exchange | |
| Okura Holdings Ltd (1655) HKEX - Hong Kong Stock Exchange | |
| Omnibridge Holdings Ltd (8462) HKEX - Hong Kong Stock Exchange | |
| Orient Securities Co Ltd (3958) HKEX - Hong Kong Stock Exchange | |
| OPC Energy Ltd (OPCE) TASE - Tel Aviv Stock Exchange | |
| Or City Holdings Ltd (APLP) TASE - Tel Aviv Stock Exchange | |
| Overseas Commerce Ltd (OVRS) TASE - Tel Aviv Stock Exchange | |