| 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 | 11 | 0.00 | | 0.00 | |
| OBD | Oxford Biodynamics PLC | 0.2600 | 0.2440 | 0.2590 | 36.79M | -0.0060 | | 2.26 | |
| OBI | Ondine Biomedical Inc | 11.50 | 11.00 | 11.30 | 29.4K | 0.10 | | 0.89 | |
| OCDO | Ocado Group PLC | 213.9 | 184.8 | 184.8 | 6.73M | 0.5 | | 0.27 | |
| OCI | Oakley Capital Investments Limited | 551.5 | 548.0 | 550.0 | 1.17M | 2.0 | | 0.36 | |
| OCN | Ocean Wilsons Holdings Ltd | 1,190 | 1,175 | 1,180 | 44.6K | -15 | | 1.26 | |
| OCTF | First Trust Global Funds Public Limited | 2,062 | 2,061 | 2,049 | 225 | 0 | | 0.01 | |
| 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 | 6.0K | 0.000 | | 0.00 | |
| OGG9 | Gold Bullion Securities LD | 330.2 | 330.2 | 330.2 | 145 | 0.0 | | 0.00 | |
| OGLD | Deutsche Boerse Commodities Gmbh | 117.5 | 116.2 | 116.6 | 1.0K | 0.3 | | 0.25 | |
| OGN | Origin Enterprises Plc | 3.900 | 3.775 | 3.900 | 367 | 0.000 | | 0.00 | |
| OGOL | Global X Metal Securities | 56.35 | 56.35 | 56.35 | 164 | -2.15 | | 3.68 | |
| OGZU | Wisdomtree Metal Securities Limited | 349.7 | 346.7 | 349.7 | 100 | 5.9 | | 1.70 | |
| OHGR | One Health Group Plc | 261.6 | 236.7 | 249.1 | 209.7K | 17.1 | | 7.36 | |
| OI20 | Kingdom Of Saudi Arabia (The) | 106.2 | 106.2 | 106.2 | 2.68M | 0.0 | | 0.00 | |
| OIG | Oryx International Growth Fund | 1,230 | 1,211 | 1,211 | 18.8K | -9 | | 0.70 | |
| OIGB | Vaneck Ucits Etfs Plc - Vaneck Oil | 18.58 | 18.30 | 18.53 | 6.9K | 0.35 | | 1.91 | |
| 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 | 24.70 | 24.53 | 24.70 | 1.1K | 0.47 | | 1.92 | |
| OIL2 | Wisdomtree Commodity Securities Limited | 683.5 | 668.0 | 683.5 | 238 | 19.3 | | 2.90 | |
| OIL3 | UBS AG | 82.86 | 82.86 | 84.28 | 1 | 0.21 | | 0.25 | |
| OILG | UBS AG UBS ETC (CMCI WTI) GBP | 7,872 | 7,612 | 7,612 | 0 | 46 | | 0.61 | |
| OILU | UBS AG | 129.9 | 129.9 | 124.7 | 75 | 0.1 | | 0.08 | |
| OIP9 | Shell International Finance B.V | 98.24 | 98.24 | 98.24 | 300.0K | 0.00 | | 0.00 | |
| OIT | Odyssean Investment Trust PLC | 167.8 | 167.0 | 167.0 | 83.8K | -1.0 | | 0.60 | |
| OM9S | Yorkshire Water Finance PLC | 69.60 | 69.60 | 69.60 | 100.0K | 0.00 | | 0.00 | |
| OMG | Oxford Metrics plc | 43.89 | 41.60 | 41.97 | 47.9K | -0.43 | | 1.02 | |
| OMI | Orosur Mining Inc | 23.24 | 21.00 | 22.77 | 2.51M | 1.62 | | 7.66 | |
| OMIP | One Media iP Group Plc | 3.975 | 3.500 | 3.750 | 63.4K | 0.250 | | 7.14 | |
| OMU | Old Mutual Ltd | 62.20 | 61.00 | 61.00 | 1.19M | 0.80 | | 1.33 | |
| OMXS | iShares OMX Stockholm Capped UCITS | 760.4 | 755.3 | 760.4 | 15.8K | 9.1 | | 1.21 | |
| ONDO | Ondo InsurTech PLC | 23.74 | 23.00 | 23.50 | 961.1K | 0.00 | | 0.00 | |
| ONT | Oxford Nanopore Technologies Ltd | 130.9 | 124.7 | 127.6 | 1.18M | -2.7 | | 2.07 | |
| ONWD | Onward Opportunities Ltd | 139.2 | 137.5 | 139.2 | 1.1K | 1.2 | | 0.87 | |
| OOA | Octopus Aim Vct PLC | 45.70 | 45.70 | 45.60 | 204.8K | 0.00 | | 0.00 | |
| OPEN | iShares Thomson Reuters Inclusion and | 9.881 | 9.881 | 9.881 | 0 | 0.021 | | 0.21 | |
| OPG | OPG Power Venture Plc | 5.700 | 5.400 | 5.400 | 3.68M | -0.100 | | 1.82 | |
| OPT | Optima Health plc | 196.0 | 193.0 | 193.0 | 102.2K | -0.2 | | 0.10 | |
| OPTI | OptiBiotix Health Plc | 8.000 | 7.500 | 7.719 | 13.0K | 0.219 | | 2.92 | |
| OQ12 | Standard Chartered PLC | 92.47 | 92.47 | 92.47 | 450.0K | 0.00 | | 0.00 | |
| ORC1 | Orchard Bond Finance PLC | 100.0 | 100.0 | 101.1 | 0 | 0.0 | | 0.00 | |
| ORCA | Orcadian Energy PLC | 14.50 | 13.98 | 13.98 | 19.6K | 1.21 | | 9.48 | |
| ORCH | Orchard Funding Group PLC | 62.00 | 57.00 | 59.88 | 67.8K | -0.12 | | 0.20 | |
| ORCP | Oracle Coalfields Plc | 0.0400 | 0.0330 | 0.0400 | 80.69M | 0.0040 | | 11.11 | |
| ORIT | Octopus Renewables Infrastructure Trust | 60.00 | 58.30 | 60.00 | 3.47M | 0.90 | | 1.52 | |
| ORNT | Orient Telecoms | 4.500 | 4.000 | 4.500 | 10.8K | 0.500 | | 12.50 | |
| ORR | Oriole Resources PLC | 0.2900 | 0.2600 | 0.2690 | 65.97M | -0.0010 | | 0.37 | |
| OS73 | Toyota Finance Australia Limited | 95.00 | 95.00 | 95.00 | 1.0M | 0.00 | | 0.00 | |
| OSB | OneSavings Bank PLC | 575.5 | 564.5 | 567.6 | 451.8K | 1.6 | | 0.28 | |
| OSEC | Octopus Aim Vct 2 PLC | 35.20 | 35.20 | 34.20 | 1.3K | 0.00 | | 0.00 | |
| OSX5 | Source Markets Public Limited Company | 55.93 | 55.92 | 55.92 | 0 | 0.30 | | 0.54 | |
| 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 | 70 | 0.00 | | 0.00 | |
| OT3 | Oxford Technology 2 Venture Capital | 8.500 | 5.000 | 7.000 | 55.0K | 0.000 | | 0.00 | |
| OT4 | Oxford Technology 2 Venture Capital | 6.500 | 4.500 | 6.500 | 5.3K | 0.000 | | 0.00 | |
| OTB | On The Beach Group PLC | 217.0 | 212.0 | 215.4 | 1.34M | 2.4 | | 1.15 | |
| 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 | 1 | 0.00 | | 0.00 | |
| OTV2 | Octopus Titan Vct PLC | 26.00 | 26.00 | 24.50 | 376 | 1.50 | | 6.12 | |
| 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 | 24.00 | 24.00 | 25.30 | 8.1K | 0.00 | | 0.00 | |
| OVZA | Wisdomtree Metal Securities Limited | 130.5 | 128.9 | 130.0 | 100 | 0.4 | | 0.28 | |
| OVZB | Wisdomtree Metal Securities Limited | 115.4 | 114.0 | 115.0 | 100 | 1.7 | | 1.46 | |
| OVZC | Wisdomtree Metal Securities Limited | 46.43 | 45.34 | 45.87 | 3.8K | 1.17 | | 2.62 | |
| OXA1 | Db Etc PLC | 243.2 | 242.8 | 243.2 | 125 | 1.5 | | 0.63 | |
| OXA2 | Db Etc PLC | 312.8 | 305.9 | 311.2 | 100 | 10.6 | | 3.54 | |
| OXA5 | Db Etc PLC | 349.6 | 347.1 | 347.1 | 0 | 1.3 | | 0.36 | |
| OXA6 | Db Etc PLC | 476.2 | 465.2 | 469.7 | 100 | 4.1 | | 0.88 | |
| OXB | Oxford BioMedica PLC | 628.0 | 614.0 | 618.8 | 134.7K | -0.2 | | 0.03 | |
| OXH | Oxford Technology 2 Venture Capital | 7.500 | 7.500 | 6.000 | 20.0K | 0.000 | | 0.00 | |
| OXIG | Oxford Instruments PLC | 2,185 | 2,120 | 2,150 | 162.2K | 30 | | 1.42 | |
| OZ76 | Nationwide Building Society | 98.25 | 98.25 | 98.25 | 578.0K | 0.00 | | 0.00 | |