| Name | Ticker | Type | ISIN code |
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| OAKDENE ORD 1P | OKD | Stock | GB0030739790 |
| OAK HLDGS ORD 5P | OAH | Stock | GB00B1XLNB88 |
| OAKLEY ORD 1P (DI) | OCL | Stock | BMG670131058 |
| OAKLEY WTS WTS TO SUB FOR ORD (DI) | OCLW | Warrant | BMG670131132 |
| OAO GAZ.ADS 4A ADS (REPR 4 ORD)(144A) | 81JK | Stock | US3682871088 |
| OAO SEV. 144A GDR (EACH REPR 1 ORD RUB0. | 50AW | Stock | US8181501045 |
| OAO TMK (144A) GDR(EACH REPR 4 ORDS) (14 | 69SI | Stock | US87260R1023 |
| OBRASCON 5% 5.00% NTS 18/05/12 EUR (BR) | 50ML | Bond | XS0299486745 |
| OBTALA RES. ORD 1P | OBT | Stock | GB00B2QPCD91 |
| OCEAN PWR DI COM SHS USD0.001 (DI) | OPT | Stock | US6748703088 |
| OCEAN WILSONS ORD 20P | OCN | Stock | BMG6699D1074 |
| OCN | OCN | Stock | |
| OCN0 | OCN0 | Stock | |
| OCTAGON5.333% 5.333%GTD SEC BD31/12/35£( | 48DB | Bond | XS0181523803 |
| OCT IHT AIM B ORD B 0.01P | OIAB | Stock | GB00B0JR9G02 |
| OCT IHT AIM ORD A 0.01P | OIAA | Stock | GB00B0JQZZ80 |
| OCTOPUS AIM NEW ORD 50P | OOA | Stock | GB0034202076 |
| OCTOPUS APP.1 ORD 10P | OAP1 | Stock | GB00B13YV684 |
| OCTOPUS APP.2 ORD 10P | OAP2 | Stock | GB00B13YVK26 |
| OCTOPUS ECL.2 ORD 10P | OEC2 | Stock | GB00B05Q9S37 |
| OCTOPUS ECL.3 ORD 10P | OEC3 | Stock | GB00B0FXRZ77 |
| OCTOPUS ECL.4 ORD 10P | OEC4 | Stock | GB00B0FXS097 |
| OCTOPUS ECL. ORD 10P | OEC1 | Stock | GB00B00MKB60 |
| OCTOPUS ORD 10P | OCT | Stock | GB00B17B3479 |
| OCTOPUS PRO ORD 10P | OPV | Stock | GB00B39XCB54 |