| OAP3 | Octopus Apollo VCT PLC | 46.30 | 46.30 | 46.30 | 0 | -1.50 | | 3.14 | |
| OAUE | UBS Etf | 42.76 | 42.76 | 42.76 | 11 | 0.00 | | 0.00 | |
| OBD | Oxford Biodynamics PLC | 0.2300 | 0.2200 | 0.2250 | 3.01M | 0.0000 | | 0.00 | |
| OBI | Ondine Biomedical Inc | 8.895 | 8.750 | 8.750 | 263.4K | 0.000 | | 0.00 | |
| OCDO | Ocado Group PLC | 245.0 | 234.1 | 240.4 | 1.44M | 0.6 | | 0.25 | |
| OCI | Oakley Capital Investments Limited | 568.0 | 562.0 | 568.0 | 183.6K | 2.0 | | 0.35 | |
| OCN | Ocean Wilsons (Holdings) LD | 1,200 | 1,175 | 1,180 | 33.8K | 0 | | 0.00 | |
| OCTF | First Trust Global Funds Public Limited | 2,042 | 2,042 | 2,042 | 0 | 8 | | 0.41 | |
| OE08 | Bank Of Montreal | 100.4 | 100.4 | 100.4 | 1.0M | 0.0 | | 0.00 | |
| OE61 | The Kingdom Of Morocco | 108.4 | 108.4 | 108.4 | 1.47M | 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 | 346.0 | 328.6 | 328.6 | 2.1K | -19.3 | | 5.54 | |
| OGLD | Deutsche Boerse Commodities Gmbh | 121.0 | 119.0 | 120.3 | 61.4K | 1.8 | | 1.54 | |
| OGN | Origin Enterprises Plc | 4.150 | 4.009 | 4.150 | 2.3K | 0.000 | | 0.00 | |
| OGOL | Global X Metal Securities | 56.35 | 56.35 | 56.35 | 32 | -5.26 | | 8.54 | |
| OGZU | Wisdomtree Metal Securities Limited | 358.0 | 354.2 | 358.0 | 100 | 5.6 | | 1.58 | |
| OHGR | One Health Group Plc | 257.0 | 251.2 | 257.0 | 11.3K | 3.0 | | 1.18 | |
| OI20 | Kingdom Of Saudi Arabia (The) | 106.2 | 106.2 | 106.2 | 2.68M | 0.0 | | 0.00 | |
| OIG | Oryx International Growth Fund | 1,259 | 1,220 | 1,250 | 6.4K | 5 | | 0.40 | |
| OIGB | Vaneck Ucits Etfs Plc - Vaneck Oil | 17.30 | 16.89 | 17.24 | 901 | 0.25 | | 1.50 | |
| 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 | 23.20 | 23.01 | 23.20 | 806 | 0.28 | | 1.22 | |
| OIL2 | Wisdomtree Commodity Securities Limited | 641.0 | 633.8 | 633.8 | 1.4K | 0.9 | | 0.14 | |
| OIL3 | UBS AG | 81.98 | 81.98 | 81.98 | 0 | 0.04 | | 0.05 | |
| OILG | UBS AG UBS ETC (CMCI WTI) GBP | 7,872 | 7,442 | 7,442 | 0 | 6 | | 0.08 | |
| OILU | UBS AG | 121.9 | 121.9 | 121.9 | 0 | 0.1 | | 0.04 | |
| OIP9 | Shell International Finance B.V | 97.70 | 97.70 | 97.70 | 0 | 0.00 | | 0.00 | |
| OIT | Odyssean Investment Trust PLC | 171.0 | 166.7 | 169.0 | 123.4K | -2.0 | | 1.17 | |
| OM9S | Yorkshire Water Finance PLC | 69.60 | 69.60 | 69.60 | 100.0K | 0.00 | | 0.00 | |
| OMG | Oxford Metrics plc | 50.24 | 49.40 | 49.75 | 121.3K | -0.05 | | 0.10 | |
| OMI | Orosur Mining Inc | 25.50 | 23.91 | 25.00 | 2.05M | 1.00 | | 4.17 | |
| OMIP | One Media iP Group Plc | 3.750 | 3.600 | 3.750 | 63 | 0.000 | | 0.00 | |
| OMU | Old Mutual Ltd | 66.40 | 65.60 | 66.40 | 597.5K | 0.40 | | 0.61 | |
| OMXS | iShares OMX Stockholm Capped UCITS | 782.4 | 773.5 | 782.0 | 1.4K | 6.5 | | 0.84 | |
| ONDO | Ondo InsurTech PLC | 22.00 | 21.00 | 21.50 | 315.4K | -0.25 | | 1.15 | |
| ONT | Oxford Nanopore Technologies Ltd | 129.5 | 126.9 | 128.1 | 421.2K | -1.6 | | 1.23 | |
| ONWD | Onward Opportunities Ltd | 148.0 | 145.0 | 148.0 | 7.1K | 4.0 | | 2.78 | |
| OOA | Octopus Aim Vct PLC | 44.40 | 44.40 | 44.40 | 0 | 0.00 | | 0.00 | |
| OPEN | iShares Thomson Reuters Inclusion and | 10.10 | 10.08 | 10.10 | 1.3K | 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 | 201.9 | 197.1 | 201.0 | 51.5K | 3.5 | | 1.77 | |
| OPTI | OptiBiotix Health Plc | 6.890 | 6.750 | 6.750 | 159.7K | 0.000 | | 0.00 | |
| OQ12 | Standard Chartered PLC | 92.46 | 92.46 | 92.46 | 0 | 0.00 | | 0.00 | |
| ORC1 | Orchard Bond Finance PLC | 100.0 | 100.0 | 101.0 | 0 | 0.0 | | 0.00 | |
| ORCA | Orcadian Energy PLC | 14.50 | 13.44 | 13.75 | 57.5K | 0.00 | | 0.00 | |
| ORCH | Orchard Funding Group PLC | 62.00 | 58.56 | 60.00 | 1.7K | 0.00 | | 0.00 | |
| ORCP | Oracle Coalfields Plc | 0.0400 | 0.0360 | 0.0375 | 25.72M | -0.0005 | | 1.32 | |
| ORIT | Octopus Renewables Infra Trust | 59.60 | 59.30 | 59.50 | 447.1K | 0.70 | | 1.19 | |
| ORNT | Orient Telecoms | 4.000 | 3.000 | 4.000 | 17.3K | 0.000 | | 0.00 | |
| ORR | Oriole Resources PLC | 0.2975 | 0.2700 | 0.2840 | 32.77M | 0.0090 | | 3.27 | |
| OS73 | Toyota Finance Australia Limited | 95.00 | 95.00 | 95.00 | 1.0M | 0.00 | | 0.00 | |
| OSB | OneSavings Bank PLC | 646.0 | 638.5 | 643.5 | 236.4K | 3.5 | | 0.55 | |
| OSEC | Octopus Aim Vct 2 PLC | 35.40 | 35.40 | 35.40 | 0 | 0.00 | | 0.00 | |
| OSX5 | Source Markets Public Limited Company | 56.10 | 55.69 | 56.10 | 0 | 0.73 | | 1.32 | |
| OT06 | Derwent London PLC | 72.10 | 72.10 | 72.10 | 9.6K | 0.00 | | 0.00 | |
| OT1 | Oxford Technology 2 Venture Capital | 17.00 | 14.50 | 14.50 | 0 | 0.00 | | 0.00 | |
| OT3 | Oxford Technology 2 Venture Capital | 8.500 | 5.000 | 7.000 | 32.2K | 0.000 | | 0.00 | |
| OT4 | Oxford Technology 2 Venture Capital | 8.500 | 4.500 | 6.500 | 32.4K | 0.000 | | 0.00 | |
| OTB | On The Beach Group PLC | 229.5 | 224.5 | 229.5 | 284.8K | 4.5 | | 2.00 | |
| OTES | Hellenic Telecommunications Organization | 9.440 | 9.440 | 9.440 | 8 | 0.000 | | 0.00 | |
| OTPD | Otp Bank PLC | 17.00 | 17.00 | 17.00 | 0 | 0.00 | | 0.00 | |
| OTV2 | Octopus Titan Vct PLC | 23.50 | 23.50 | 23.50 | 0 | 0.00 | | 0.00 | |
| OUFU | Ossiam Irl Icav | 207.1 | 207.1 | 205.2 | 3 | -1.0 | | 0.49 | |
| OVB | Ovoca Bio PLC | 1.295 | 1.045 | 1.150 | 173.3K | 0.000 | | 0.00 | |
| OVCT | Oberon Aim Vct PLC | 25.70 | 25.70 | 25.70 | 0 | 0.40 | | 1.58 | |
| OVZA | Wisdomtree Metal Securities Limited | 173.0 | 165.6 | 172.7 | 5.3K | 9.3 | | 5.70 | |
| OVZB | Wisdomtree Metal Securities Limited | 131.3 | 125.0 | 128.4 | 137 | 2.4 | | 1.91 | |
| OVZC | Wisdomtree Metal Securities Limited | 59.40 | 54.20 | 59.09 | 18.0K | 3.63 | | 6.54 | |
| OXA1 | Db Etc PLC | 252.6 | 250.3 | 252.6 | 922 | 4.5 | | 1.80 | |
| OXA2 | Db Etc PLC | 399.7 | 362.4 | 399.0 | 1.5K | 23.8 | | 6.35 | |
| OXA5 | Db Etc PLC | 360.5 | 355.4 | 358.7 | 6.4K | 5.1 | | 1.44 | |
| OXA6 | Db Etc PLC | 605.0 | 588.0 | 603.0 | 100 | 50.0 | | 9.03 | |
| OXB | Oxford BioMedica PLC | 632.0 | 616.0 | 620.0 | 138.3K | 3.0 | | 0.49 | |
| OXH | Oxford Technology 2 Venture Capital | 6.000 | 6.000 | 6.000 | 0 | 0.000 | | 0.00 | |
| OXIG | Oxford Instruments PLC | 2,085 | 2,050 | 2,075 | 35.5K | 0 | | 0.00 | |
| OZ76 | Nationwide Building Society | 98.25 | 98.25 | 98.25 | 578.0K | 0.00 | | 0.00 | |