| OAP3 | Octopus Apollo VCT PLC | 46.30 | 46.30 | 46.30 | 0 | 0.10 | | 0.22 | |
| OAUE | UBS Etf | 42.76 | 42.76 | 42.76 | 19 | 0.00 | | 0.00 | |
| OBD | Oxford Biodynamics PLC | 0.2500 | 0.2000 | 0.2000 | 16.89M | -0.0300 | | 13.04 | |
| OBI | Ondine Biomedical Inc | 10.95 | 10.68 | 10.75 | 473.0K | 0.15 | | 1.42 | |
| OCDO | Ocado Group PLC | 205.8 | 190.9 | 191.7 | 3.63M | -8.0 | | 4.00 | |
| OCI | Oakley Capital Investments Limited | 492.0 | 476.1 | 492.0 | 1.02M | 13.0 | | 2.71 | |
| OCTF | First Trust Global Funds Public Limited | 2,026 | 2,026 | 1,997 | 150 | 0 | | 0.01 | |
| OE08 | Bank Of Montreal | 100.4 | 100.4 | 100.4 | 1.0M | 0.0 | | 0.00 | |
| OE61 | The Kingdom Of Morocco | 106.7 | 106.7 | 106.7 | 0 | 0.0 | | 0.00 | |
| OFG | Octopus Future Generations VCT plc | 79.50 | 79.50 | 79.50 | 0 | 0.00 | | 0.00 | |
| OGDC | OGDC | 8.200 | 8.200 | 8.200 | 0 | 0.000 | | 0.00 | |
| OGG9 | Gold Bullion Securities LD | 368.2 | 368.2 | 368.2 | 0 | -8.7 | | 2.30 | |
| OGLD | Deutsche Boerse Commodities Gmbh | 131.4 | 126.5 | 127.6 | 2.4K | -0.7 | | 0.57 | |
| OGN | Origin Enterprises Plc | 3.841 | 3.700 | 3.700 | 52 | -380.400 | | 99.04 | |
| OGOL | Global X Metal Securities | 56.35 | 56.35 | 56.35 | 7 | 0.00 | | 0.00 | |
| OGZU | Wisdomtree Metal Securities Limited | 389.8 | 377.8 | 379.2 | 518 | -2.7 | | 0.71 | |
| OHGR | One Health Group Plc | 243.0 | 240.0 | 240.0 | 3.7K | 2.4 | | 1.01 | |
| OI20 | Kingdom Of Saudi Arabia (The) | 104.3 | 104.3 | 104.3 | 0 | 0.0 | | 0.00 | |
| OIG | Oryx International Growth Fund | 1,220 | 1,175 | 1,175 | 3.2K | -10 | | 0.84 | |
| OIGB | Vaneck Ucits Etfs Plc - Vaneck Oil | 24.38 | 23.80 | 24.07 | 11.3K | -0.21 | | 0.84 | |
| 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 | 32.42 | 31.77 | 32.12 | 35.3K | -0.38 | | 1.15 | |
| OIL2 | Wisdomtree Commodity Securities Limited | 1,766 | 1,636 | 1,766 | 15.5K | -19 | | 1.06 | |
| OIL3 | UBS AG | 112.2 | 109.7 | 135.6 | 128 | 0.0 | | 0.00 | |
| OILG | UBS AG UBS ETC (CMCI WTI) GBP | 10,408 | 7,872 | 10,408 | 0 | 0 | | 0.00 | |
| OILU | UBS BBG CMCI WTI Crude | 176.3 | 172.9 | 176.3 | 4.0K | -2.5 | | 1.37 | |
| OIP9 | Shell International Finance B.V | 97.70 | 97.70 | 97.70 | 0 | 0.00 | | 0.00 | |
| OIT | Odyssean Investment Trust PLC | 179.5 | 178.0 | 178.0 | 24.2K | -1.0 | | 0.56 | |
| OM9S | Yorkshire Water Finance PLC | 78.59 | 78.59 | 78.59 | 0 | 0.00 | | 0.00 | |
| OMG | Oxford Metrics plc | 46.00 | 44.00 | 44.00 | 67.3K | -1.50 | | 3.30 | |
| OMI | Orosur Mining Inc | 18.80 | 17.27 | 18.00 | 2.25M | 0.00 | | 0.00 | |
| OMIP | One Media iP Group Plc | 3.500 | 3.500 | 3.500 | 568 | 0.300 | | 9.38 | |
| OMU | Old Mutual Ltd | 62.80 | 60.00 | 60.40 | 390.4K | -0.60 | | 0.98 | |
| OMXS | iShares OMX Stockholm Capped UCITS | 773.5 | 749.3 | 749.3 | 19.4K | -11.0 | | 1.45 | |
| ONDO | Ondo InsurTech PLC | 15.15 | 14.63 | 14.80 | 719.3K | 0.20 | | 1.37 | |
| ONT | Oxford Nanopore Technologies Ltd | 123.3 | 119.6 | 119.8 | 1.91M | 0.0 | | 0.00 | |
| ONWD | Onward Opportunities Ltd | 129.5 | 128.0 | 129.5 | 1.6K | 1.5 | | 1.17 | |
| OOA | Octopus Aim Vct PLC | 38.70 | 38.70 | 38.60 | 101.9K | 0.00 | | 0.00 | |
| OPEN | iShares Thomson Reuters Inclusion and | 9.931 | 9.710 | 9.710 | 11.1K | -0.152 | | 1.54 | |
| OPT | Optima Health plc | 183.0 | 180.0 | 181.5 | 46.2K | -0.5 | | 0.27 | |
| OPTI | OptiBiotix Health Plc | 6.000 | 5.625 | 5.750 | 219.2K | -0.450 | | 7.26 | |
| OQ12 | Standard Chartered PLC | 91.00 | 91.00 | 91.00 | 0 | 0.00 | | 0.00 | |
| ORC1 | Orchard Bond Finance PLC | 103.0 | 103.0 | 100.5 | 0 | 2.2 | | 2.16 | |
| ORCA | Orcadian Energy PLC | 14.75 | 14.50 | 14.75 | 25.7K | -0.10 | | 0.67 | |
| ORCH | Orchard Funding Group PLC | 58.80 | 55.23 | 56.00 | 33.1K | -2.00 | | 3.45 | |
| ORCP | Oracle Coalfields Plc | 0.0450 | 0.0400 | 0.0435 | 47.37M | 0.0005 | | 1.16 | |
| ORIT | Octopus Renewables Infrastructure Trust | 59.20 | 57.70 | 58.80 | 1.36M | 0.80 | | 1.38 | |
| ORNT | Orient Telecoms | 4.000 | 3.200 | 4.000 | 0 | 0.000 | | 0.00 | |
| ORR | Oriole Resources PLC | 0.3000 | 0.2800 | 0.2900 | 42.38M | -0.0100 | | 3.33 | |
| OS73 | Toyota Finance Australia Limited | 96.04 | 96.04 | 96.04 | 0 | 0.00 | | 0.00 | |
| OSB | OneSavings Bank PLC | 553.5 | 534.8 | 536.5 | 2.76M | -6.0 | | 1.11 | |
| OSEC | Octopus Aim Vct 2 PLC | 30.80 | 30.80 | 30.80 | 48.5K | 0.00 | | 0.00 | |
| OSX5 | Source Markets Public Limited Company | 54.68 | 54.68 | 54.68 | 0 | 0.20 | | 0.37 | |
| OT06 | Derwent London PLC | 72.10 | 72.10 | 72.10 | 9.6K | 0.00 | | 0.00 | |
| OT1 | Oxford Technology 2 Venture Capital | 16.00 | 14.50 | 14.50 | 10.0K | 0.00 | | 0.00 | |
| OT3 | Oxford Technology 2 Venture Capital | 8.500 | 7.500 | 7.500 | 0 | 0.000 | | 0.00 | |
| OT4 | Oxford Technology 2 Venture Capital | 8.500 | 7.500 | 7.500 | 0 | 0.000 | | 0.00 | |
| OTB | On The Beach Group PLC | 163.6 | 157.0 | 157.0 | 727.0K | -4.6 | | 2.85 | |
| OTES | Hellenic Telecommunications Organization | 9.590 | 9.540 | 9.590 | 2 | 0.000 | | 0.00 | |
| OTPD | OTP Bank Plc | 17.00 | 17.00 | 17.00 | 0 | 0.00 | | 0.00 | |
| OTV2 | Octopus Titan Vct PLC | 21.00 | 21.00 | 21.50 | 25.0K | 0.00 | | 0.00 | |
| OVB | Ovoca Bio PLC | 7.920 | 7.000 | 7.300 | 513.9K | 0.000 | | 0.00 | |
| OVCT | Oberon Aim Vct PLC | 24.60 | 24.60 | 25.70 | 16.0K | 0.00 | | 0.00 | |
| OVZA | Wisdomtree Metal Securities Limited | 158.9 | 153.8 | 154.8 | 5 | 1.0 | | 0.65 | |
| OVZB | Wisdomtree Metal Securities Limited | 117.2 | 110.4 | 112.2 | 10 | -2.4 | | 2.07 | |
| OVZC | Wisdomtree Metal Securities Limited | 57.97 | 54.20 | 55.10 | 8.3K | -0.56 | | 1.00 | |
| OXA1 | Db Etc PLC | 268.7 | 259.0 | 260.9 | 3.4K | -1.1 | | 0.43 | |
| OXA2 | Db Etc PLC | 380.7 | 357.1 | 362.9 | 44 | -3.9 | | 1.06 | |
| OXA5 | Db Etc PLC | 391.2 | 373.6 | 380.9 | 38 | -1.8 | | 0.46 | |
| OXA6 | Db Etc PLC | 595.1 | 556.0 | 566.1 | 63 | -8.0 | | 1.38 | |
| OXB | Oxford BioMedica PLC | 626.0 | 601.0 | 617.0 | 517.0K | -1.0 | | 0.16 | |
| OXH | Oxford Technology 2 Venture Capital | 8.000 | 8.000 | 7.000 | 20.0K | 0.000 | | 0.00 | |
| OXIG | Oxford Instruments PLC | 2,515 | 2,306 | 2,390 | 217.9K | -15 | | 0.62 | |
| OZ76 | Nationwide Building Society | 98.25 | 98.25 | 98.25 | 578.0K | 0.00 | | 0.00 | |