| OAP3 | Octopus Apollo Vct PLC | 46.40 | 46.40 | 46.40 | 2.2K | -0.10 | | 0.22 | |
| OAUE | UBS Etf | 42.76 | 42.76 | 42.76 | 19 | 0.00 | | 0.00 | |
| OBD | Oxford Biodynamics PLC | 0.2600 | 0.2400 | 0.2400 | 5.95M | -0.0090 | | 3.61 | |
| OBI | Ondine Biomedical Inc. | 11.50 | 10.65 | 11.25 | 224.8K | 0.35 | | 3.21 | |
| OCDO | Ocado Group PLC | 208.2 | 198.2 | 207.8 | 2.24M | 6.7 | | 3.31 | |
| OCI | Oakley Capital Investments Limited | 490.0 | 473.0 | 473.0 | 419.0K | -17.0 | | 3.47 | |
| OCTF | First Trust Global Funds Public Limited | 2,026 | 2,026 | 2,030 | 150 | -5 | | 0.25 | |
| 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 | -1.2 | | 1.13 | |
| OFG | Octopus Future Generations Vct PLC | 79.50 | 79.50 | 79.50 | 0 | 0.00 | | 0.00 | |
| OGDC | Oil And Gas Development Company Limited | 8.200 | 8.200 | 8.200 | 120 | 0.000 | | 0.00 | |
| OGG9 | Gold Bullion Securities LD | 401.3 | 398.9 | 398.9 | 0 | -6.9 | | 1.70 | |
| OGLD | Deutsche Boerse Commodities Gmbh | 140.9 | 139.5 | 139.5 | 2.1K | -2.2 | | 1.53 | |
| OGN | Origin Enterprises PLC | 384.1 | 384.1 | 370.0 | 1.3K | -366.3 | | 9900.00 | |
| OGOL | Global X Metal Securities | 56.35 | 56.35 | 56.35 | 30 | 0.00 | | 0.00 | |
| OGZU | Wisdomtree Metal Securities Limited | 419.0 | 415.8 | 416.0 | 0 | -5.2 | | 1.23 | |
| OHGR | One Health Group PLC | 247.9 | 239.6 | 247.9 | 6.4K | -0.6 | | 0.24 | |
| OI20 | Kingdom Of Saudi Arabia (The) | 104.3 | 104.3 | 104.3 | 0 | 0.0 | | 0.00 | |
| OIG | Oryx International Growth Fund LTD | 1,277 | 1,220 | 1,220 | 4.4K | -59 | | 4.59 | |
| OIGB | Vaneck Ucits Etfs PLC | 23.35 | 22.91 | 23.07 | 10.5K | 0.03 | | 0.11 | |
| OIH | Orascom Investment Holding S.A.E | 0.0150 | 0.0140 | 0.0140 | 1.8K | 0.0000 | | 0.00 | |
| OIHV | Vaneck Ucits Etfs PLC | 30.90 | 30.58 | 30.58 | 5.6K | 0.25 | | 0.82 | |
| OIL2 | Wisdomtree Commodity Securities Limited | 1,796 | 1,586 | 1,619 | 9.8K | -62 | | 3.69 | |
| OIL3 | UBS AG | 112.2 | 109.7 | 129.0 | 128 | 8.2 | | 6.46 | |
| OILG | UBS AG | 7,466 | 7,466 | 10,408 | 0 | 223 | | 2.18 | |
| OILU | UBS AG | 158.0 | 158.0 | 170.0 | 100 | 8.1 | | 4.87 | |
| OIP9 | Shell International Finance B.V | 97.70 | 97.70 | 97.70 | 0 | 0.00 | | 0.00 | |
| OIT | Odyssean Investment Trust PLC | 185.0 | 183.5 | 184.1 | 55.3K | 0.6 | | 0.34 | |
| OM9S | Yorkshire Water Finance PLC | 69.60 | 69.60 | 69.60 | 100.0K | 0.00 | | 0.00 | |
| OMG | Oxford Metrics PLC | 47.00 | 45.80 | 45.80 | 135.4K | -0.90 | | 1.93 | |
| OMI | Orosur Mining INC | 19.70 | 18.75 | 19.58 | 1.98M | 0.08 | | 0.38 | |
| OMIP | One Media Ip Group PLC | 3.800 | 3.776 | 3.800 | 37 | 0.300 | | 9.38 | |
| OMU | Old Mutual Limited | 69.80 | 64.60 | 69.80 | 114.8K | 5.20 | | 8.05 | |
| OMXS | Ishares Iv PLC | 799.8 | 788.5 | 794.3 | 135.2K | 1.5 | | 0.19 | |
| ONDO | Ondo Insurtech PLC | 16.50 | 16.00 | 16.00 | 140.0K | 0.42 | | 2.67 | |
| ONT | Oxford Nanopore Technologies PLC | 118.9 | 114.4 | 117.3 | 1.05M | 1.1 | | 0.96 | |
| ONWD | Onward Opportunities Limited | 137.3 | 130.9 | 130.9 | 36.8K | -4.1 | | 3.04 | |
| OOA | Octopus Aim Vct PLC | 45.40 | 45.40 | 39.20 | 5.0K | -4.00 | | 10.00 | |
| OPEN | Ishares Iv PLC | 9.973 | 9.937 | 9.973 | 0 | 0.067 | | 0.68 | |
| OPT | Optima Health PLC | 183.0 | 180.0 | 182.0 | 91.6K | 0.0 | | 0.00 | |
| OPTI | Optibiotix Health PLC | 6.500 | 5.500 | 5.800 | 94.5K | -0.200 | | 3.33 | |
| OQ12 | Standard Chartered PLC | 92.40 | 92.40 | 92.54 | 0 | 0.00 | | 0.00 | |
| ORC1 | Orchard Bond Finance PLC | 103.0 | 103.0 | 100.7 | 0 | 2.2 | | 2.21 | |
| ORCA | Orcadian Energy PLC | 17.00 | 15.50 | 17.00 | 1.6K | 0.65 | | 3.98 | |
| ORCH | Orchard Funding Group PLC | 61.00 | 58.00 | 58.00 | 22 | -0.10 | | 0.17 | |
| ORCP | Oracle Power PLC | 0.0450 | 0.0450 | 0.0450 | 140.56M | -0.0026 | | 5.46 | |
| ORIT | Octopus Renewables Infrastructure Trust | 57.40 | 56.40 | 57.00 | 1.13M | 0.50 | | 0.88 | |
| ORNT | Orient Telecoms PLC | 3.200 | 3.200 | 4.000 | 5.0K | 0.000 | | 0.00 | |
| ORR | Oriole Resources PLC | 0.3400 | 0.3000 | 0.3200 | 45.58M | 0.0000 | | 0.00 | |
| OS73 | Toyota Finance Australia Limited | 96.04 | 96.04 | 96.04 | 0 | 0.00 | | 0.00 | |
| OSB | Osb Group PLC | 570.5 | 560.5 | 560.5 | 476.7K | -9.7 | | 1.71 | |
| OSEC | Octopus Aim Vct 2 PLC | 36.00 | 36.00 | 31.20 | 16 | -4.20 | | 13.21 | |
| OSX5 | Source Markets Public Limited Company | 55.43 | 55.42 | 55.43 | 2 | 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 | 16.00 | 16.00 | 14.50 | 10.0K | -1.50 | | 9.38 | |
| OT3 | Oxford Technology 2 Venture Capital | 8.500 | 8.500 | 7.500 | 10.0K | 0.000 | | 0.00 | |
| OT4 | Oxford Technology 2 Venture Capital | 8.500 | 8.500 | 7.500 | 10.0K | 0.000 | | 0.00 | |
| OTB | On The Beach Group PLC | 163.4 | 159.8 | 159.8 | 661.8K | -2.4 | | 1.48 | |
| OTES | Hellenic Telecommunications Organization | 9.950 | 9.950 | 9.950 | 6 | -0.060 | | 0.60 | |
| OTPD | Otp Bank PLC | 17.00 | 17.00 | 17.00 | 1 | 0.00 | | 0.00 | |
| OTV2 | Octopus Titan Vct PLC | 15.00 | 15.00 | 21.50 | 5.4K | 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 | 168.4 | 161.4 | 166.5 | 37 | 4.4 | | 2.70 | |
| OVZB | Wisdomtree Metal Securities Limited | 127.7 | 120.0 | 126.5 | 44 | 1.1 | | 0.87 | |
| OVZC | Wisdomtree Metal Securities Limited | 64.75 | 61.40 | 63.48 | 8.2K | -0.41 | | 0.64 | |
| OXA1 | Db Etc PLC | 286.3 | 283.8 | 283.9 | 952 | -2.9 | | 1.00 | |
| OXA2 | Db Etc PLC | 423.6 | 402.4 | 416.3 | 17 | -1.0 | | 0.24 | |
| OXA5 | Db Etc PLC | 419.9 | 416.4 | 417.0 | 6 | -5.5 | | 1.29 | |
| OXA6 | Db Etc PLC | 663.9 | 630.0 | 652.3 | 369 | -1.6 | | 0.24 | |
| OXB | Oxford Biomedica PLC | 644.0 | 625.0 | 633.0 | 93.5K | 3.0 | | 0.48 | |
| OXH | Oxford Technology 2 Venture Capital | 8.000 | 8.000 | 7.000 | 20.0K | 0.000 | | 0.00 | |
| OXIG | Oxford Instruments PLC | 2,530 | 2,470 | 2,500 | 179.9K | -27 | | 1.08 | |
| OZ76 | Nationwide Building Society | 98.25 | 98.25 | 98.25 | 578.0K | 0.00 | | 0.00 | |