| OAP3 | Octopus Apollo Vct Plc | 46.70 | 46.70 | 46.70 | 1.22M | 0.00 | | 0.00 | |
| OAUE | UBS Etf | 125.6 | 125.6 | 125.6 | 333 | 0.0 | | 0.00 | |
| OBD | Oxford Biodynamics Plc | 0.2000 | 0.1790 | 0.1900 | 17.23M | 0.0000 | | 0.00 | |
| OBI | Ondine Biomedical Inc | 12.00 | 11.00 | 11.25 | 2.04M | 0.25 | | 2.27 | |
| OCDO | Ocado Group Plc | 184.4 | 179.8 | 182.4 | 6.57M | 2.5 | | 1.39 | |
| OCI | Oakley Capital Investments Limited | 512.0 | 494.0 | 508.0 | 171.6K | 12.0 | | 2.42 | |
| OCTF | First Trust Global Funds Public Limited | 2,052 | 2,041 | 2,052 | 211 | 12 | | 0.58 | |
| OE08 | Bank Of Montreal | 100.4 | 100.4 | 100.4 | 1.0M | 0.0 | | 0.00 | |
| OE61 | The Kingdom Of Morocco | 107.4 | 107.4 | 107.4 | 0 | 1.7 | | 1.61 | |
| OFG | Octopus Future Generations Vct Plc | 77.00 | 77.00 | 77.00 | 0 | 0.00 | | 0.00 | |
| OGDC | Oil and Gas Development Company Limited | 8.000 | 8.000 | 8.000 | 0 | 0.000 | | 0.00 | |
| OGG9 | Gold Bullion Securities | 370.5 | 370.5 | 370.5 | 1.4K | 6.9 | | 1.91 | |
| OGLD | Deutsche Boerse Commodities Gmbh | 130.3 | 130.3 | 130.3 | 150 | 3.5 | | 2.76 | |
| OGN | Origin Enterprises Plc | 405.0 | 405.0 | 405.0 | 12.7K | 0.0 | | 0.00 | |
| OGOL | Global X Metal Securities | 56.35 | 56.35 | 56.35 | 42 | -4.63 | | 7.59 | |
| OGZU | Wisdomtree Metal Securities Limited | 390.0 | 381.1 | 381.1 | 100 | 4.2 | | 1.12 | |
| OHGR | One Health Group Plc | 244.0 | 240.9 | 244.0 | 1.6K | -2.0 | | 0.81 | |
| OI20 | Kingdom Of Saudi Arabia (The) | 101.5 | 101.5 | 101.5 | 0 | 0.0 | | 0.00 | |
| OIG | Oryx International Growth Fund Ltd | 1,240 | 1,217 | 1,240 | 8.1K | 15 | | 1.22 | |
| OIGB | Vaneck Oil Services Ucits ETF | 25.42 | 24.47 | 24.73 | 19.7K | -0.64 | | 2.52 | |
| 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 | 34.08 | 33.25 | 33.44 | 24.5K | -0.54 | | 1.59 | |
| OIL2 | Wisdomtree WTI Crude Oil 2X Daily Lev | 1,603 | 1,508 | 1,534 | 14.9K | -153 | | 9.09 | |
| 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 | 173.4 | 169.5 | 171.3 | 100 | -3.2 | | 1.85 | |
| OIP9 | Shell International Finance B.V | 97.40 | 97.40 | 97.40 | 0 | 0.00 | | 0.00 | |
| OIT | Odyssean Investment Trust Plc | 188.0 | 180.5 | 188.0 | 159.0K | 3.0 | | 1.62 | |
| OM9S | Yorkshire Water Finance PLC | 77.40 | 77.40 | 77.40 | 0 | 0.00 | | 0.00 | |
| OMG | Oxford Metrics Plc | 49.10 | 46.10 | 49.10 | 578.5K | 3.00 | | 6.51 | |
| OMI | Orosur Mining Inc | 22.00 | 18.00 | 20.95 | 6.7M | 3.20 | | 18.03 | |
| OMIP | One Media Ip Group Plc | 3.400 | 3.000 | 3.200 | 8.59M | 0.100 | | 3.23 | |
| OMU | Old Mutual Limited | 63.20 | 60.40 | 61.80 | 71.3K | 0.80 | | 1.31 | |
| OMXS | Ishares Omx Stockholm Capped Ucits ETF | 839.8 | 834.0 | 834.5 | 13.6K | 2.8 | | 0.33 | |
| ONDO | Ondo Insurtech Plc | 15.00 | 14.00 | 14.60 | 412.0K | -0.25 | | 1.68 | |
| ONT | Oxford Nanopore Technologies Plc | 112.9 | 106.2 | 112.9 | 3.92M | 7.5 | | 7.12 | |
| ONWD | Onward Opportunities Limited | 129.0 | 126.0 | 126.0 | 31.9K | 1.0 | | 0.80 | |
| OOA | Octopus Aim Vct Plc | 37.20 | 37.20 | 37.20 | 0 | 0.00 | | 0.00 | |
| OPEN | Ish Re Incl / Diversity ETF | 10.53 | 10.49 | 10.53 | 100 | 0.21 | | 1.99 | |
| OPT | Optima Health Plc | 183.0 | 178.0 | 180.0 | 207.6K | -0.5 | | 0.28 | |
| OPTI | Optibiotix Health Plc | 5.500 | 5.226 | 5.300 | 38.5K | -0.050 | | 0.93 | |
| OQ12 | Standard Chartered PLC | 91.02 | 91.02 | 91.02 | 0 | 0.00 | | 0.00 | |
| ORC1 | Orchard Bond Finance PLC | 100.0 | 100.0 | 100.8 | 0 | 2.2 | | 2.21 | |
| ORCA | Orcadian Energy Plc | 17.00 | 15.47 | 16.00 | 132.5K | -0.50 | | 3.03 | |
| ORCH | Orchard Funding Group Plc | 58.00 | 56.50 | 56.50 | 9.1K | 0.50 | | 0.89 | |
| ORCP | Oracle Power Plc | 0.0550 | 0.0400 | 0.0500 | 93.15M | 0.0050 | | 11.11 | |
| ORIT | Octopus Renewables Infrastructure Trust | 61.50 | 56.60 | 60.50 | 3.09M | 2.20 | | 3.77 | |
| ORNT | Orient Telecoms Plc | 4.000 | 4.000 | 4.000 | 0 | 0.000 | | 0.00 | |
| ORR | Oriole Resources Plc | 0.3500 | 0.3100 | 0.3300 | 65.87M | 0.0100 | | 3.13 | |
| OS73 | Toyota Finance Australia Limited | 95.17 | 95.17 | 95.17 | 0 | 0.00 | | 0.00 | |
| OSB | Osb Group Plc | 559.5 | 544.0 | 559.5 | 1.61M | 10.0 | | 1.82 | |
| OSEC | Octopus Aim Vct 2 Plc | 29.60 | 29.60 | 29.60 | 0 | 0.00 | | 0.00 | |
| OSX5 | Source Markets Public Limited Company | 57.44 | 57.14 | 57.44 | 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 | 178.0 | 171.6 | 177.6 | 502.0K | 8.0 | | 4.72 | |
| OTES | Hellenic Telecommunications Organization | 10.50 | 10.50 | 10.50 | 1 | 0.00 | | 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 | 23.50 | 20.00 | 23.50 | 1.0K | 0.00 | | 0.00 | |
| OVZA | Wisdomtree Metal Securities Limited | 162.4 | 159.6 | 161.4 | 100 | 2.6 | | 1.61 | |
| OVZB | Wisdomtree Metal Securities Limited | 123.8 | 120.5 | 121.9 | 100 | 1.7 | | 1.39 | |
| OVZC | Wisdomtree Metal Securities Limited | 61.17 | 58.04 | 58.04 | 4.3K | 1.76 | | 3.13 | |
| OXA1 | Physical Gold Euro Hdg Etc | 271.8 | 262.8 | 262.8 | 992 | 2.9 | | 1.13 | |
| OXA2 | Db Etc PLC | 386.8 | 386.8 | 386.8 | 25 | 3.4 | | 0.89 | |
| OXA5 | Physical Gold Etc 27/08/60 | 390.2 | 387.5 | 390.2 | 476 | 10.5 | | 2.77 | |
| OXA6 | Physical Silver Etc 27/08/60 | 603.4 | 603.4 | 603.4 | 100 | 1.2 | | 0.20 | |
| OXB | Oxford Biomedica Plc | 625.0 | 567.4 | 625.0 | 322.5K | 53.0 | | 9.27 | |
| OXH | Oxford Technology 2 Venture Capital | 7.000 | 7.000 | 7.000 | 0 | 0.000 | | 0.00 | |
| OXIG | Oxford Instruments Plc | 2,794 | 2,656 | 2,792 | 271.3K | 142 | | 5.36 | |
| OZ76 | Nationwide Building Society | 98.25 | 98.25 | 98.25 | 578.0K | 0.00 | | 0.00 | |