| OAP3 | Octopus Apollo VCT PLC | 47.10 | 47.10 | 47.10 | 0 | 0.00 | | 0.00 | |
| OAUE | UBS Etf | 42.76 | 42.76 | 42.76 | 73 | 0.00 | | 0.00 | |
| OBD | Oxford Biodynamics PLC | 0.2900 | 0.2750 | 0.2820 | 11.66M | 0.0020 | | 0.71 | |
| OBI | Ondine Biomedical Inc | 11.46 | 11.21 | 11.46 | 98.7K | 0.21 | | 1.87 | |
| OCDO | Ocado Group PLC | 188.4 | 182.5 | 185.4 | 6.41M | -2.2 | | 1.17 | |
| OCI | Oakley Capital Investments Limited | 566.0 | 554.0 | 558.0 | 112.5K | -8.0 | | 1.41 | |
| OCN | Ocean Wilsons Holdings Ltd | 1,150 | 1,125 | 1,130 | 3.4K | -15 | | 1.32 | |
| OCTF | First Trust Global Funds Public Limited | 2,062 | 2,061 | 2,024 | 225 | 0 | | 0.00 | |
| OE08 | Bank Of Montreal | 100.4 | 100.4 | 100.4 | 1.0M | 0.0 | | 0.00 | |
| OE61 | The Kingdom Of Morocco | 108.8 | 108.8 | 108.8 | 550.0K | 0.0 | | 0.00 | |
| OFG | Octopus Future Generations VCT plc | 79.50 | 79.50 | 79.50 | 0 | 0.00 | | 0.00 | |
| OGDC | Oil And Gas Development Company Limited | 8.000 | 8.000 | 8.000 | 6.0K | 0.000 | | 0.00 | |
| OGG9 | Gold Bullion Securities LD | 329.6 | 329.6 | 329.6 | 3.8K | 0.0 | | 0.00 | |
| OGLD | Deutsche Boerse Commodities Gmbh | 113.9 | 112.3 | 113.8 | 3.6K | 0.5 | | 0.43 | |
| OGN | Origin Enterprises Plc | 3.775 | 3.730 | 3.775 | 10.6K | 0.045 | | 1.21 | |
| OGOL | Global X Metal Securities | 56.35 | 56.35 | 56.35 | 1.6K | 0.00 | | 0.00 | |
| OGZU | Wisdomtree Metal Securities Limited | 338.8 | 334.0 | 338.8 | 0 | 0.7 | | 0.20 | |
| OHGR | One Health Group Plc | 232.5 | 226.2 | 227.0 | 10.9K | -2.0 | | 0.87 | |
| OI20 | Kingdom Of Saudi Arabia (The) | 106.2 | 106.2 | 106.2 | 2.68M | 0.0 | | 0.00 | |
| OIG | Oryx International Growth Fund | 1,243 | 1,243 | 1,243 | 965 | -15 | | 1.19 | |
| OIGB | Vaneck Ucits Etfs Plc - Vaneck Oil | 16.94 | 16.56 | 16.80 | 2.3K | -0.56 | | 3.22 | |
| OIH | Orascom Investment Holding S.A.E | 0.0150 | 0.0140 | 0.0140 | 1.8K | 0.0000 | | 0.00 | |
| OIHV | VanEck Oil Services ETF A USD Acc | 22.08 | 21.79 | 21.79 | 8.1K | -0.95 | | 4.16 | |
| OIL2 | Wisdomtree Commodity Securities Limited | 655.8 | 643.5 | 645.3 | 31.3K | -28.5 | | 4.23 | |
| OIL3 | UBS AG | 86.17 | 86.17 | 81.16 | 0 | -0.17 | | 0.20 | |
| OILG | UBS AG UBS ETC (CMCI WTI) GBP | 7,872 | 7,386 | 7,386 | 0 | -128 | | 1.70 | |
| OILU | UBS AG | 129.9 | 129.9 | 121.0 | 75 | -0.2 | | 0.16 | |
| OIP9 | Shell International Finance B.V | 98.24 | 98.24 | 98.24 | 300.0K | 0.00 | | 0.00 | |
| OIT | Odyssean Investment Trust PLC | 164.0 | 162.7 | 164.0 | 96.1K | -2.0 | | 1.20 | |
| OM9S | Yorkshire Water Finance PLC | 69.60 | 69.60 | 69.60 | 100.0K | 0.00 | | 0.00 | |
| OMG | Oxford Metrics plc | 43.90 | 41.70 | 41.70 | 124.3K | -1.30 | | 3.02 | |
| OMI | Orosur Mining Inc | 20.50 | 18.60 | 19.50 | 1.38M | -1.00 | | 4.88 | |
| OMIP | One Media iP Group Plc | 3.975 | 3.750 | 3.750 | 125 | 0.000 | | 0.00 | |
| OMU | Old Mutual Ltd | 59.60 | 58.00 | 59.40 | 127.8K | -2.40 | | 3.88 | |
| OMXS | iShares OMX Stockholm Capped UCITS | 726.3 | 717.3 | 722.3 | 62.1K | -3.7 | | 0.51 | |
| ONDO | Ondo InsurTech PLC | 32.00 | 30.00 | 32.00 | 1.73M | 1.00 | | 3.23 | |
| ONT | Oxford Nanopore Technologies Ltd | 132.3 | 121.0 | 132.1 | 2.39M | 8.0 | | 6.45 | |
| ONWD | Onward Opportunities Ltd | 134.5 | 132.6 | 134.5 | 8.0K | 0.5 | | 0.39 | |
| OOA | Octopus Aim Vct PLC | 45.70 | 45.70 | 46.00 | 204.8K | 0.00 | | 0.00 | |
| OPEN | iShares Thomson Reuters Inclusion and | 9.516 | 9.516 | 9.516 | 129 | -0.012 | | 0.13 | |
| OPG | OPG Power Venture Plc | 6.019 | 5.800 | 5.810 | 31.58M | -0.090 | | 1.53 | |
| OPT | Optima Health plc | 204.0 | 202.0 | 202.0 | 53.8K | -1.0 | | 0.49 | |
| OPTI | OptiBiotix Health Plc | 7.925 | 7.800 | 7.925 | 78.1K | 0.025 | | 0.32 | |
| OQ12 | Standard Chartered PLC | 92.69 | 92.69 | 92.69 | 1.63M | 0.00 | | 0.00 | |
| ORC1 | Orchard Bond Finance PLC | 99.3 | 99.3 | 101.1 | 6.6K | 0.0 | | 0.00 | |
| ORCA | Orcadian Energy PLC | 16.00 | 14.11 | 14.50 | 148.7K | -0.75 | | 4.92 | |
| ORCH | Orchard Funding Group PLC | 60.00 | 57.00 | 59.00 | 19.6K | 1.00 | | 1.72 | |
| ORCP | Oracle Coalfields Plc | 0.0400 | 0.0320 | 0.0380 | 153.87M | -0.0020 | | 5.00 | |
| ORIT | Octopus Renewables Infrastructure Trust | 58.50 | 57.70 | 57.70 | 605.3K | -0.50 | | 0.86 | |
| ORNT | Orient Telecoms | 4.000 | 3.200 | 4.000 | 15.0K | 0.000 | | 0.00 | |
| ORR | Oriole Resources PLC | 0.2500 | 0.2400 | 0.2500 | 8.75M | 0.0100 | | 4.17 | |
| OS73 | Toyota Finance Australia Limited | 95.00 | 95.00 | 95.00 | 1.0M | 0.00 | | 0.00 | |
| OSB | OneSavings Bank PLC | 540.5 | 527.5 | 537.0 | 434.0K | 2.5 | | 0.47 | |
| OSEC | Octopus Aim Vct 2 PLC | 34.74 | 34.40 | 34.60 | 132.4K | 0.00 | | 0.00 | |
| OSX5 | Source Markets Public Limited Company | 53.39 | 53.39 | 53.39 | 0 | -0.86 | | 1.59 | |
| OT06 | Derwent London PLC | 72.10 | 72.10 | 72.10 | 9.6K | 0.00 | | 0.00 | |
| OT1 | Oxford Technology 2 Venture Capital | 17.00 | 14.50 | 14.50 | 70 | 0.00 | | 0.00 | |
| OT3 | Oxford Technology 2 Venture Capital | 8.500 | 5.000 | 7.000 | 55.0K | 0.000 | | 0.00 | |
| OT4 | Oxford Technology 2 Venture Capital | 6.500 | 4.500 | 6.500 | 5.3K | 0.000 | | 0.00 | |
| OTB | On The Beach Group PLC | 188.4 | 183.0 | 184.0 | 1.56M | -1.6 | | 0.86 | |
| OTES | Hellenic Telecommunications Organization | 9.440 | 9.440 | 9.440 | 8 | 0.000 | | 0.00 | |
| OTPD | Otp Bank PLC | 17.00 | 17.00 | 17.00 | 1 | 0.00 | | 0.00 | |
| OTV2 | Octopus Titan Vct PLC | 26.00 | 26.00 | 24.50 | 25.0K | 0.00 | | 0.00 | |
| OUFU | Ossiam Irl Icav | 207.1 | 207.1 | 205.2 | 3 | -1.0 | | 0.49 | |
| OVB | Ovoca Bio PLC | 1.295 | 1.045 | 1.150 | 173.3K | 0.000 | | 0.00 | |
| OVCT | Oberon Aim Vct PLC | 24.00 | 24.00 | 25.10 | 8.1K | 0.00 | | 0.00 | |
| OVZA | Wisdomtree Metal Securities Limited | 120.8 | 118.5 | 120.8 | 100 | -1.5 | | 1.19 | |
| OVZB | Wisdomtree Metal Securities Limited | 110.4 | 106.9 | 108.3 | 5.8K | -1.8 | | 1.65 | |
| OVZC | Wisdomtree Metal Securities Limited | 39.57 | 38.60 | 39.54 | 370 | -0.73 | | 1.82 | |
| OXA1 | Db Etc PLC | 233.8 | 231.7 | 233.8 | 298 | -0.9 | | 0.38 | |
| OXA2 | Db Etc PLC | 262.8 | 257.8 | 262.5 | 100 | -6.6 | | 2.46 | |
| OXA5 | Db Etc PLC | 339.7 | 335.0 | 338.7 | 100 | -2.0 | | 0.58 | |
| OXA6 | Db Etc PLC | 405.7 | 396.7 | 404.4 | 100 | 0.6 | | 0.14 | |
| OXB | Oxford BioMedica PLC | 607.0 | 581.0 | 592.4 | 188.0K | -14.6 | | 2.40 | |
| OXH | Oxford Technology 2 Venture Capital | 7.500 | 7.500 | 6.000 | 20.0K | 0.000 | | 0.00 | |
| OXIG | Oxford Instruments PLC | 1,940 | 1,878 | 1,922 | 93.5K | -16 | | 0.83 | |
| OZ76 | Nationwide Building Society | 98.25 | 98.25 | 98.25 | 578.0K | 0.00 | | 0.00 | |