| OAP3 | Octopus Apollo Vct Plc | 48.20 | 45.20 | 46.70 | 19.5K | -1.50 | | 3.11 | |
| OAUE | UBS Etf | 125.6 | 125.6 | 125.6 | 396 | 0.0 | | 0.00 | |
| OBD | Oxford Biodynamics Plc | 0.2100 | 0.1900 | 0.1920 | 21.53M | -0.0080 | | 4.00 | |
| OBI | Ondine Biomedical Inc | 11.00 | 10.50 | 10.75 | 160.5K | 0.00 | | 0.00 | |
| OCDO | Ocado Group Plc | 183.0 | 175.9 | 180.1 | 3.22M | -1.8 | | 0.99 | |
| OCI | Oakley Capital Investments Limited | 471.0 | 438.8 | 468.0 | 913.9K | 26.0 | | 5.88 | |
| OCTF | First Trust Global Funds Public Limited | 1,996 | 1,996 | 1,996 | 0 | 11 | | 0.54 | |
| 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 | 77.00 | 77.00 | 77.00 | 0 | 0.00 | | 0.00 | |
| OGDC | Oil and Gas Development Company Limited | 8.200 | 8.200 | 8.200 | 0 | 0.000 | | 0.00 | |
| OGG9 | Gold Bullion Securities | 351.6 | 351.6 | 351.6 | 926 | -45.9 | | 11.54 | |
| OGLD | Deutsche Boerse Commodities Gmbh | 128.8 | 123.7 | 123.7 | 100 | -16.9 | | 12.00 | |
| OGN | Origin Enterprises Plc | 377.5 | 377.5 | 377.5 | 0 | 7.5 | | 2.03 | |
| OGOL | Global X Metal Securities | 56.35 | 56.35 | 56.35 | 2 | -3.27 | | 5.48 | |
| OGZU | Wisdomtree Metal Securities Limited | 383.3 | 367.7 | 367.7 | 100 | 0.5 | | 0.14 | |
| OHGR | One Health Group Plc | 242.0 | 237.9 | 242.0 | 2.0K | 0.0 | | 0.00 | |
| OI20 | Kingdom Of Saudi Arabia (The) | 101.5 | 101.5 | 101.5 | 0 | 0.0 | | 0.00 | |
| OIG | Oryx International Growth Fund Ltd | 1,250 | 1,155 | 1,200 | 8.4K | -5 | | 0.41 | |
| OIGB | Vaneck Oil Services Ucits ETF | 25.59 | 25.05 | 25.55 | 26.0K | -0.26 | | 1.01 | |
| OIH | Orascom Investment Holding S.A.E | 0.0150 | 0.0140 | 0.0140 | 1.8K | 0.0000 | | 0.00 | |
| OIHV | Vaneck Oil Services Ucits ETF | 33.82 | 33.09 | 33.57 | 57.0K | -0.27 | | 0.79 | |
| OIL2 | Wisdomtree WTI Crude Oil 2X Daily Lev | 1,886 | 1,814 | 1,851 | 5.1K | 29 | | 1.58 | |
| OIL3 | UBS Etc [Cmci WTI 3M] USD | 132.1 | 132.1 | 132.1 | 0 | 0.0 | | 0.00 | |
| OILG | UBS Etc [Cmci Wti] GBP | 10,408 | 10,408 | 10,408 | 0 | 0 | | 0.00 | |
| OILU | UBS Etc [Ubs BBG CMCI WTI Crude Idx] USD | 173.3 | 173.3 | 173.3 | 0 | -2.3 | | 1.32 | |
| OIP9 | Shell International Finance B.V | 97.08 | 97.08 | 97.08 | 0 | 0.00 | | 0.00 | |
| OIT | Odyssean Investment Trust Plc | 177.5 | 171.0 | 172.5 | 244.2K | 0.0 | | 0.00 | |
| OM9S | Yorkshire Water Finance PLC | 77.40 | 77.40 | 77.40 | 0 | 0.00 | | 0.00 | |
| OMG | Oxford Metrics Plc | 44.90 | 43.10 | 43.60 | 395.1K | -1.40 | | 3.11 | |
| OMI | Orosur Mining Inc | 19.00 | 17.50 | 18.00 | 1.14M | -1.00 | | 5.26 | |
| OMIP | One Media Ip Group Plc | 3.200 | 3.000 | 3.200 | 12.6K | 0.000 | | 0.00 | |
| OMU | Old Mutual Limited | 62.80 | 60.80 | 62.00 | 200.2K | 0.00 | | 0.00 | |
| OMXS | Ishares Omx Stockholm Capped Ucits ETF | 775.0 | 760.0 | 769.0 | 175.9K | 8.8 | | 1.15 | |
| ONDO | Ondo Insurtech Plc | 15.00 | 14.00 | 14.50 | 385.6K | -0.25 | | 1.69 | |
| ONT | Oxford Nanopore Technologies Plc | 110.8 | 106.0 | 110.8 | 1.56M | 4.2 | | 3.94 | |
| ONWD | Onward Opportunities Limited | 123.5 | 122.0 | 123.5 | 100 | 0.0 | | 0.00 | |
| OOA | Octopus Aim Vct Plc | 37.20 | 37.20 | 37.20 | 0 | -0.60 | | 1.59 | |
| OPEN | Ish Re Incl / Diversity ETF | 9.745 | 9.725 | 9.737 | 11.6K | 0.039 | | 0.40 | |
| OPT | Optima Health Plc | 181.4 | 178.0 | 180.0 | 60.6K | 0.0 | | 0.00 | |
| OPTI | Optibiotix Health Plc | 5.000 | 4.700 | 4.900 | 1.17M | 0.000 | | 0.00 | |
| OQ12 | Standard Chartered PLC | 91.00 | 91.00 | 91.00 | 0 | 0.00 | | 0.00 | |
| ORC1 | Orchard Bond Finance PLC | 103.0 | 103.0 | 100.4 | 0 | 2.2 | | 2.21 | |
| ORCA | Orcadian Energy Plc | 15.00 | 13.00 | 14.00 | 140.7K | 0.50 | | 3.70 | |
| ORCH | Orchard Funding Group Plc | 56.00 | 53.00 | 53.00 | 6.9K | -2.50 | | 4.50 | |
| ORCP | Oracle Power Plc | 0.0550 | 0.0400 | 0.0480 | 405.22M | 0.0060 | | 14.29 | |
| ORIT | Octopus Renewables Infrastructure Trust | 57.20 | 52.80 | 52.80 | 2.33M | -3.90 | | 6.88 | |
| ORNT | Orient Telecoms Plc | 4.000 | 4.000 | 4.000 | 0 | 0.000 | | 0.00 | |
| ORR | Oriole Resources Plc | 0.3000 | 0.2800 | 0.2900 | 15.26M | 0.0100 | | 3.57 | |
| OS73 | Toyota Finance Australia Limited | 95.17 | 95.17 | 95.17 | 0 | 0.00 | | 0.00 | |
| OSB | Osb Group Plc | 529.0 | 517.0 | 520.0 | 2.1M | 3.5 | | 0.68 | |
| OSEC | Octopus Aim Vct 2 Plc | 29.60 | 29.60 | 29.60 | 0 | -0.40 | | 1.33 | |
| OSX5 | Source Markets Public Limited Company | 53.29 | 53.29 | 53.29 | 0 | 0.00 | | 0.00 | |
| OT06 | Derwent London PLC | 72.10 | 72.10 | 72.10 | 9.6K | 0.00 | | 0.00 | |
| OT1 | Oxford Technology 2 Venture Capital | 14.50 | 14.50 | 14.50 | 0 | 0.00 | | 0.00 | |
| OT3 | Oxford Technology 2 Venture Capital | 7.500 | 7.500 | 7.500 | 0 | 0.000 | | 0.00 | |
| OT4 | Oxford Technology 2 Venture Capital | 7.500 | 7.500 | 7.500 | 0 | 0.000 | | 0.00 | |
| OTB | On The Beach Group Plc | 162.2 | 153.8 | 157.2 | 1.65M | -1.0 | | 0.63 | |
| OTES | Hellenic Telecommunications Organization | 9.770 | 9.210 | 9.770 | 1 | 0.000 | | 0.00 | |
| OTPD | Gdr [Each Repr 1/2 Ord Huf100][Reg S] | 17.00 | 17.00 | 17.00 | 0 | 0.00 | | 0.00 | |
| OTV2 | Octopus Titan Vct Plc | 20.50 | 20.50 | 20.50 | 0 | 0.00 | | 0.00 | |
| OVCT | Oberon Aim Vct Plc | 24.50 | 24.50 | 24.50 | 0 | 0.00 | | 0.00 | |
| OVZA | Wisdomtree Metal Securities Limited | 154.1 | 151.0 | 152.6 | 100 | 5.1 | | 3.48 | |
| OVZB | Wisdomtree Metal Securities Limited | 117.1 | 114.2 | 115.2 | 100 | 2.1 | | 1.88 | |
| OVZC | Wisdomtree Metal Securities Limited | 63.75 | 57.11 | 63.75 | 2.0K | 1.06 | | 1.69 | |
| OXA1 | Physical Gold Euro Hdg Etc | 286.1 | 259.3 | 286.1 | 1.0K | 26.1 | | 10.05 | |
| OXA2 | Physical Silver Euro Hdg Etc | 369.5 | 369.5 | 369.5 | 0 | 18.5 | | 5.27 | |
| OXA5 | Physical Gold Etc 27/08/60 | 383.0 | 383.0 | 383.0 | 100 | 17.6 | | 4.82 | |
| OXA6 | Physical Silver Etc 27/08/60 | 553.5 | 553.5 | 553.5 | 100 | -91.0 | | 14.12 | |
| OXB | Oxford Biomedica Plc | 566.0 | 542.0 | 545.0 | 181.1K | -6.0 | | 1.09 | |
| OXH | Oxford Technology 2 Venture Capital | 7.000 | 7.000 | 7.000 | 0 | 0.000 | | 0.00 | |
| OXIG | Oxford Instruments Plc | 2,400 | 2,275 | 2,400 | 224.2K | 45 | | 1.91 | |
| OZ76 | Nationwide Building Society | 98.25 | 98.25 | 98.25 | 578.0K | 0.00 | | 0.00 | |