| OAP3 | Octopus Apollo VCT PLC | 47.80 | 44.80 | 46.30 | 2.7K | 0.00 | | 0.00 | |
| OAUE | UBS Etf | 42.76 | 42.76 | 42.76 | 11 | 0.00 | | 0.00 | |
| OBD | Oxford Biodynamics PLC | 0.2300 | 0.2231 | 0.2300 | 1.37M | 0.0000 | | 0.00 | |
| OBI | Ondine Biomedical Inc | 9.000 | 8.636 | 8.750 | 57.0K | 0.150 | | 1.74 | |
| OCDO | Ocado Group PLC | 247.8 | 240.5 | 241.8 | 336.4K | -0.1 | | 0.04 | |
| OCI | Oakley Capital Investments Limited | 566.0 | 556.0 | 556.0 | 40.4K | -4.0 | | 0.71 | |
| OCN | Ocean Wilsons (Holdings) LD | 1,200 | 1,175 | 1,180 | 33.8K | 0 | | 0.00 | |
| OCTF | First Trust Global Funds Public Limited | 2,034 | 2,034 | 2,034 | 0 | -3 | | 0.15 | |
| 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 | 347.9 | 338.1 | 347.9 | 110 | 0.0 | | 0.00 | |
| OGLD | Deutsche Boerse Commodities Gmbh | 122.6 | 118.8 | 121.9 | 1.6K | 0.0 | | 0.00 | |
| OGN | Origin Enterprises Plc | 4.150 | 4.009 | 4.150 | 217 | 0.000 | | 0.00 | |
| OGOL | Global X Metal Securities | 56.35 | 56.35 | 56.35 | 128 | 0.00 | | 0.00 | |
| OGZU | Wisdomtree Metal Securities Limited | 364.6 | 349.1 | 362.5 | 3 | 0.0 | | 0.00 | |
| OHGR | One Health Group Plc | 254.2 | 253.0 | 253.0 | 906 | 2.0 | | 0.80 | |
| OI20 | Kingdom Of Saudi Arabia (The) | 106.2 | 106.2 | 106.2 | 2.68M | 0.0 | | 0.00 | |
| OIG | Oryx International Growth Fund | 1,290 | 1,220 | 1,248 | 2.5K | -8 | | 0.60 | |
| OIGB | Vaneck Ucits Etfs Plc - Vaneck Oil | 17.09 | 16.92 | 17.05 | 1.5K | 0.07 | | 0.42 | |
| 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 | 23.05 | 22.99 | 23.05 | 1.0K | 0.12 | | 0.54 | |
| OIL2 | Wisdomtree Commodity Securities Limited | 644.4 | 639.5 | 644.4 | 1.7K | 8.6 | | 1.36 | |
| OIL3 | UBS AG | 82.61 | 82.61 | 82.61 | 0 | 0.56 | | 0.68 | |
| OILG | UBS AG UBS ETC (CMCI WTI) GBP | 7,872 | 7,479 | 7,479 | 0 | 37 | | 0.50 | |
| OILU | UBS AG | 122.5 | 122.5 | 122.5 | 0 | 0.6 | | 0.49 | |
| OIP9 | Shell International Finance B.V | 97.70 | 97.70 | 97.70 | 0 | 0.00 | | 0.00 | |
| OIT | Odyssean Investment Trust PLC | 170.0 | 168.0 | 170.0 | 27.8K | 0.0 | | 0.00 | |
| OM9S | Yorkshire Water Finance PLC | 69.60 | 69.60 | 69.60 | 100.0K | 0.00 | | 0.00 | |
| OMG | Oxford Metrics plc | 49.37 | 48.45 | 48.45 | 143.5K | -0.35 | | 0.72 | |
| OMI | Orosur Mining Inc | 24.00 | 21.91 | 22.25 | 1.29M | -0.55 | | 2.41 | |
| OMIP | One Media iP Group Plc | 3.975 | 3.750 | 3.750 | 50 | 0.000 | | 0.00 | |
| OMU | Old Mutual Ltd | 65.80 | 64.60 | 65.40 | 57.7K | 0.60 | | 0.93 | |
| OMXS | iShares OMX Stockholm Capped UCITS | 772.5 | 768.0 | 770.4 | 1.3K | 0.0 | | 0.00 | |
| ONDO | Ondo InsurTech PLC | 22.00 | 21.50 | 21.75 | 146.8K | -0.25 | | 1.14 | |
| ONT | Oxford Nanopore Technologies Ltd | 131.7 | 127.5 | 127.9 | 150.1K | -1.6 | | 1.24 | |
| ONWD | Onward Opportunities Ltd | 145.0 | 144.0 | 144.0 | 6.7K | 0.5 | | 0.35 | |
| OOA | Octopus Aim Vct PLC | 47.00 | 47.00 | 47.00 | 0 | 0.00 | | 0.00 | |
| OPEN | iShares Thomson Reuters Inclusion and | 10.06 | 10.06 | 10.06 | 148 | 0.02 | | 0.24 | |
| OPG | Opg Power Ventures PLC | 5.700 | 5.300 | 5.400 | 1.25M | 0.000 | | 0.00 | |
| OPT | Optima Health plc | 200.0 | 196.0 | 197.5 | 58.9K | 0.0 | | 0.00 | |
| OPTI | OptiBiotix Health Plc | 6.890 | 6.525 | 6.750 | 8.1K | 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 | 13.50 | 12.80 | 13.50 | 20.0K | 0.25 | | 1.89 | |
| ORCH | Orchard Funding Group PLC | 62.00 | 60.00 | 60.00 | 7.2K | 0.00 | | 0.00 | |
| ORCP | Oracle Coalfields Plc | 0.0380 | 0.0322 | 0.0340 | 76.39M | -0.0020 | | 5.56 | |
| ORIT | Octopus Renewables Infra Trust | 58.80 | 58.30 | 58.80 | 141.2K | -0.30 | | 0.51 | |
| ORNT | Orient Telecoms | 4.500 | 4.000 | 4.000 | 0 | 0.000 | | 0.00 | |
| ORR | Oriole Resources PLC | 0.2870 | 0.2600 | 0.2750 | 8.34M | 0.0050 | | 1.85 | |
| OS73 | Toyota Finance Australia Limited | 95.00 | 95.00 | 95.00 | 1.0M | 0.00 | | 0.00 | |
| OSB | OneSavings Bank PLC | 644.0 | 636.0 | 636.5 | 158.1K | -1.5 | | 0.24 | |
| OSEC | Octopus Aim Vct 2 PLC | 35.40 | 35.40 | 35.40 | 0 | 0.00 | | 0.00 | |
| OSX5 | Source Markets Public Limited Company | 55.49 | 55.25 | 55.37 | 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 | 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 | 227.0 | 228.5 | 166.4K | 0.5 | | 0.22 | |
| 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 | 23.50 | 18.00 | 23.50 | 10.5K | 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 | 25.30 | 25.30 | 25.30 | 0 | 0.00 | | 0.00 | |
| OVZA | Wisdomtree Metal Securities Limited | 173.6 | 144.7 | 173.6 | 159 | 0.0 | | 0.00 | |
| OVZB | Wisdomtree Metal Securities Limited | 149.8 | 139.8 | 142.7 | 193 | -2.3 | | 1.59 | |
| OVZC | Wisdomtree Metal Securities Limited | 56.08 | 55.29 | 56.05 | 455 | 1.52 | | 2.79 | |
| OXA1 | Db Etc PLC | 257.7 | 248.8 | 256.3 | 309 | 0.0 | | 0.00 | |
| OXA2 | Db Etc PLC | 371.6 | 365.3 | 369.8 | 54 | 0.0 | | 0.00 | |
| OXA5 | Db Etc PLC | 365.5 | 352.1 | 363.4 | 7 | 0.0 | | 0.00 | |
| OXA6 | Db Etc PLC | 550.0 | 550.0 | 550.0 | 563 | 20.4 | | 3.84 | |
| OXB | Oxford BioMedica PLC | 621.0 | 590.0 | 604.0 | 20.9K | -6.0 | | 0.98 | |
| OXH | Oxford Technology 2 Venture Capital | 6.000 | 6.000 | 6.000 | 0 | 0.000 | | 0.00 | |
| OXIG | Oxford Instruments PLC | 2,080 | 2,050 | 2,055 | 9.8K | -5 | | 0.24 | |
| OZ76 | Nationwide Building Society | 98.25 | 98.25 | 98.25 | 578.0K | 0.00 | | 0.00 | |