| Name | Ticker | Type | ISIN code |
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| OMX COPENHAGEN CAP_GI | OMXCCAPGI | Index | |
| OMX_COPENHAGEN_MID_CAP_GI | OMXCMCGI | Index | SE0001776683 |
| OMX_COPENHAGEN_MID_CAP_PI | OMXCMCPI | Index | SE0001776675 |
| OMX_COPENHAGEN_MID_CAP_PLUS_PI | OMXCMCPLUSPI | Index | |
| OMX STOCKHOLM BENCHMARK CAP_PI | OMXSBCAPPI | Index | SE0000744229 |
| OMX STOCKHOLM BENCHMARK_GI | OMXSBGI | Index | SE0000744211 |
| ONE MEDIA HOLDING AB | ONE | Stock | SE0001096140 |
| ORASOLV AB | OS | Stock | SE0001183732 |
| ORC SOFTWARE AB | ORC | Stock | SE0000634321 |
| ORIFLAME COSMETICS S.A\, SDB | ORI-SDB | Stock | SE0001174889 |
| ORION B + ORIOLA B | ORIONBASKET | Index | |
| ORION CORPORATION B | ORNBV | Stock | FI0009014377 |