| OAP3 | Octopus Apollo Vct PLC | 46.30 | 46.30 | 46.30 | 0 | 0.00 | | 0.00 | |
| OAUE | UBS Etf | 42.76 | 42.76 | 42.76 | 39 | 0.00 | | 0.00 | |
| OBD | Oxford Biodynamics PLC | 0.2900 | 0.2540 | 0.2700 | 2.2M | 0.0000 | | 0.00 | |
| OBI | Ondine Biomedical Inc. | 9.000 | 8.500 | 8.500 | 15.0K | 0.000 | | 0.00 | |
| OCDO | Ocado Group PLC | 232.2 | 208.7 | 232.2 | 12.34M | 20.5 | | 9.68 | |
| OCI | Oakley Capital Investments Limited | 540.0 | 530.0 | 532.0 | 976.7K | 2.0 | | 0.38 | |
| OCN | Ocean Wilsons (Holdings) LD | 1,200 | 1,175 | 1,180 | 33.8K | 0 | | 0.00 | |
| OCTF | First Trust Global Funds Public Limited | 2,012 | 2,012 | 2,012 | 0 | -19 | | 0.95 | |
| OE08 | Bank Of Montreal | 100.4 | 100.4 | 100.4 | 1.0M | 0.0 | | 0.00 | |
| OE61 | The Kingdom Of Morocco | 108.0 | 108.0 | 108.0 | 200.0K | 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 | 0 | 0.000 | | 0.00 | |
| OGG9 | Gold Bullion Securities LD | 405.4 | 380.9 | 381.9 | 11.0K | 19.4 | | 5.34 | |
| OGLD | Deutsche Boerse Commodities Gmbh | 138.7 | 133.0 | 135.4 | 419.2K | 7.9 | | 6.23 | |
| OGN | Origin Enterprises PLC | 4.250 | 4.200 | 4.200 | 3.7K | 0.000 | | 0.00 | |
| OGOL | Global X Metal Securities | 62.61 | 62.61 | 62.61 | 2.5K | -8.38 | | 11.80 | |
| OGZU | Wisdomtree Metal Securities Limited | 411.3 | 396.4 | 402.1 | 507 | 21.9 | | 5.75 | |
| OHGR | One Health Group PLC | 225.8 | 224.0 | 225.0 | 11.0K | -5.0 | | 2.17 | |
| OI20 | Kingdom Of Saudi Arabia (The) | 105.3 | 105.3 | 105.3 | 11.0M | 0.0 | | 0.00 | |
| OIG | Oryx International Growth Fund LTD | 1,350 | 1,240 | 1,330 | 11.6K | 45 | | 3.50 | |
| OIGB | Vaneck Ucits Etfs PLC | 21.00 | 20.01 | 20.77 | 42.8K | 0.19 | | 0.94 | |
| OIH | Orascom Investment Holding S.A.E | 0.0150 | 0.0140 | 0.0140 | 1.8K | 0.0000 | | 0.00 | |
| OIHV | Vaneck Ucits Etfs PLC | 28.53 | 27.80 | 28.46 | 145.3K | 0.27 | | 0.96 | |
| OIL2 | Wisdomtree Commodity Securities Limited | 724.4 | 690.8 | 724.4 | 1.3K | 16.6 | | 2.35 | |
| OIL3 | UBS AG | 88.60 | 88.60 | 88.60 | 0 | 1.18 | | 1.35 | |
| OILG | UBS AG | 7,874 | 7,874 | 7,874 | 0 | 101 | | 1.30 | |
| OILU | UBS AG | 129.2 | 129.2 | 129.2 | 0 | 1.6 | | 1.25 | |
| OIP9 | Shell International Finance B.V | 97.70 | 97.70 | 97.70 | 0 | 0.00 | | 0.00 | |
| OIT | Odyssean Investment Trust PLC | 183.0 | 178.0 | 179.5 | 101.9K | -1.5 | | 0.83 | |
| OM9S | Yorkshire Water Finance PLC | 69.60 | 69.60 | 69.60 | 100.0K | 0.00 | | 0.00 | |
| OMG | Oxford Metrics PLC | 59.80 | 56.20 | 58.20 | 930.8K | 1.20 | | 2.11 | |
| OMI | Orosur Mining INC | 35.65 | 30.50 | 34.00 | 4.09M | 2.50 | | 7.94 | |
| OMIP | One Media Ip Group PLC | 4.000 | 3.500 | 3.600 | 245 | -0.400 | | 10.00 | |
| OMU | Old Mutual Limited | 73.00 | 71.40 | 71.80 | 15.9K | 0.20 | | 0.28 | |
| OMXS | Ishares Iv PLC | 834.8 | 826.8 | 831.0 | 14.6K | 6.1 | | 0.74 | |
| ONDO | Ondo Insurtech PLC | 17.50 | 17.00 | 17.00 | 562.1K | -0.25 | | 1.45 | |
| ONT | Oxford Nanopore Technologies PLC | 158.4 | 152.3 | 153.6 | 1.12M | -2.1 | | 1.35 | |
| ONWD | Onward Opportunities Limited | 148.7 | 145.0 | 146.0 | 16.3K | -4.0 | | 2.67 | |
| OOA | Octopus Aim Vct PLC | 45.40 | 45.40 | 45.40 | 0 | 0.00 | | 0.00 | |
| OPEN | Ishares Iv PLC | 10.39 | 10.31 | 10.31 | 973 | -0.03 | | 0.33 | |
| OPG | Opg Power Ventures PLC | 5.700 | 5.300 | 5.400 | 1.25M | 0.000 | | 0.00 | |
| OPT | Optima Health PLC | 215.0 | 214.0 | 214.5 | 307.1K | 0.0 | | 0.00 | |
| OPTI | Optibiotix Health PLC | 8.000 | 7.300 | 7.650 | 102.8K | 0.000 | | 0.00 | |
| OQ12 | Standard Chartered PLC | 92.40 | 92.40 | 92.54 | 0 | 0.00 | | 0.00 | |
| ORC1 | Orchard Bond Finance PLC | 100.7 | 100.7 | 101.4 | 0 | 0.0 | | 0.00 | |
| ORCA | Orcadian Energy PLC | 20.00 | 18.00 | 19.00 | 18.6K | 0.00 | | 0.00 | |
| ORCH | Orchard Funding Group PLC | 60.00 | 59.00 | 60.00 | 66.0K | 0.00 | | 0.00 | |
| ORCP | Oracle Power PLC | 0.0650 | 0.0550 | 0.0580 | 167.21M | -0.0050 | | 7.94 | |
| ORIT | Octopus Renewables Infrastructure Trust | 57.90 | 55.40 | 55.90 | 879.5K | 1.10 | | 2.01 | |
| ORNT | Orient Telecoms PLC | 4.000 | 4.000 | 4.000 | 0 | 0.000 | | 0.00 | |
| ORR | Oriole Resources PLC | 0.3700 | 0.3400 | 0.3600 | 55.32M | 0.0100 | | 2.86 | |
| OS73 | Toyota Finance Australia Limited | 95.93 | 95.93 | 95.93 | 0 | 0.00 | | 0.00 | |
| OSB | Osb Group PLC | 626.0 | 613.0 | 614.0 | 1.11M | -5.0 | | 0.81 | |
| OSEC | Octopus Aim Vct 2 PLC | 36.00 | 36.00 | 36.00 | 0 | 0.00 | | 0.00 | |
| OSX5 | Source Markets Public Limited Company | 58.48 | 57.99 | 58.00 | 100 | 0.09 | | 0.16 | |
| 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 | 225.0 | 215.0 | 215.5 | 371.0K | -7.5 | | 3.36 | |
| OTES | Hellenic Telecommunications Organization | 9.830 | 9.450 | 9.540 | 100 | -0.110 | | 1.14 | |
| OTPD | Otp Bank PLC | 17.00 | 17.00 | 17.00 | 0 | 0.00 | | 0.00 | |
| OTV2 | Octopus Titan Vct PLC | 21.50 | 21.50 | 21.50 | 19.2K | 0.00 | | 0.00 | |
| OUFU | Ossiam Irl Icav | 207.1 | 207.1 | 205.2 | 3 | -1.0 | | 0.49 | |
| OVB | Ovoca Bio PLC | 7.500 | 7.000 | 7.250 | 224.6K | 1.250 | | 20.83 | |
| OVCT | Oberon Aim Vct PLC | 25.70 | 25.70 | 25.70 | 0 | 0.00 | | 0.00 | |
| OVZA | Wisdomtree Metal Securities Limited | 202.6 | 171.2 | 174.3 | 8.6K | 7.4 | | 4.44 | |
| OVZB | Wisdomtree Metal Securities Limited | 150.0 | 138.0 | 139.6 | 10.4K | 7.1 | | 5.35 | |
| OVZC | Wisdomtree Metal Securities Limited | 84.44 | 66.14 | 68.35 | 285.9K | 7.53 | | 12.38 | |
| OXA1 | Db Etc PLC | 290.6 | 280.2 | 280.9 | 1.2K | 14.3 | | 5.36 | |
| OXA2 | Db Etc PLC | 569.9 | 449.5 | 462.4 | 8.1K | 54.7 | | 13.43 | |
| OXA5 | Db Etc PLC | 414.3 | 399.0 | 404.0 | 2.8K | 23.5 | | 6.18 | |
| OXA6 | Db Etc PLC | 803.6 | 679.0 | 803.6 | 2.9K | -124.8 | | 13.44 | |
| OXB | Oxford Biomedica PLC | 847.0 | 813.0 | 818.0 | 300.2K | -12.0 | | 1.45 | |
| OXH | Oxford Technology 2 Venture Capital | 7.000 | 7.000 | 7.000 | 0 | 0.000 | | 0.00 | |
| OXIG | Oxford Instruments PLC | 2,560 | 2,450 | 2,470 | 587.4K | -40 | | 1.59 | |
| OZ76 | Nationwide Building Society | 98.25 | 98.25 | 98.25 | 578.0K | 0.00 | | 0.00 | |