| 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 | 0.2580 | 0.2400 | 0.2430 | 10.6M | -0.0070 | | 2.80 | |
| OBI | Ondine Biomedical Inc | 8.500 | 7.610 | 8.050 | 178.1K | -0.200 | | 2.42 | |
| OCDO | Ocado Group PLC | 275.2 | 265.1 | 271.7 | 1.67M | 4.7 | | 1.76 | |
| OCI | Oakley Capital Investments Limited | 572.0 | 564.0 | 570.0 | 120.9K | 0.0 | | 0.00 | |
| OCN | Ocean Wilsons (Holdings) LD | 1,200 | 1,175 | 1,180 | 33.8K | 0 | | 0.00 | |
| OCTF | First Trust Global Funds Public Limited | 2,050 | 2,050 | 2,061 | 150 | 1 | | 0.02 | |
| 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 | 0 | 0.0 | | 0.00 | |
| OFG | Octopus Future Generations VCT plc | 79.50 | 79.50 | 79.50 | 0 | 0.00 | | 0.00 | |
| OGDC | OGDC | 8.000 | 8.000 | 8.000 | 0 | 0.000 | | 0.00 | |
| OGG9 | Gold Bullion Securities LD | 351.5 | 351.5 | 351.5 | 364 | 1.9 | | 0.55 | |
| OGLD | Deutsche Boerse Commodities Gmbh | 124.8 | 123.3 | 124.5 | 10.1K | 1.6 | | 1.30 | |
| OGN | Origin Enterprises Plc | 4.200 | 4.050 | 4.200 | 276 | 0.115 | | 2.82 | |
| OGOL | Global X Metal Securities | 56.35 | 56.35 | 56.35 | 17 | 0.00 | | 0.00 | |
| OGZU | Wisdomtree Metal Securities Limited | 371.1 | 367.0 | 371.1 | 100 | 6.0 | | 1.64 | |
| OHGR | One Health Group Plc | 257.6 | 251.8 | 251.8 | 6.4K | 4.0 | | 1.59 | |
| OI20 | Kingdom Of Saudi Arabia (The) | 106.2 | 106.2 | 106.2 | 2.68M | 0.0 | | 0.00 | |
| OIG | Oryx International Growth Fund | 1,260 | 1,196 | 1,260 | 5.4K | 23 | | 1.82 | |
| OIGB | Vaneck Ucits Etfs Plc - Vaneck Oil | 19.18 | 18.91 | 19.11 | 22.4K | 0.49 | | 2.61 | |
| 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 | 25.72 | 25.33 | 25.55 | 13.1K | 0.63 | | 2.51 | |
| OIL2 | Wisdomtree Commodity Securities Limited | 660.0 | 635.5 | 660.0 | 8.5K | 12.6 | | 2.05 | |
| OIL3 | UBS AG | 82.86 | 82.86 | 84.03 | 1 | 0.70 | | 0.87 | |
| OILG | UBS AG UBS ETC (CMCI WTI) GBP | 7,872 | 7,579 | 7,579 | 0 | 252 | | 3.46 | |
| OILU | UBS AG | 124.0 | 124.0 | 124.0 | 100 | 0.7 | | 0.61 | |
| OIP9 | Shell International Finance B.V | 97.70 | 97.70 | 97.70 | 0 | 0.00 | | 0.00 | |
| OIT | Odyssean Investment Trust PLC | 173.0 | 171.0 | 172.0 | 231.5K | 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 | 53.00 | 50.40 | 51.00 | 170.9K | -0.60 | | 1.16 | |
| OMI | Orosur Mining Inc | 26.50 | 24.50 | 25.00 | 3.97M | 0.75 | | 3.09 | |
| OMIP | One Media iP Group Plc | 4.000 | 3.500 | 4.000 | 823 | 0.000 | | 0.00 | |
| OMU | Old Mutual Ltd | 69.40 | 67.71 | 68.40 | 68.0K | -0.20 | | 0.29 | |
| OMXS | iShares OMX Stockholm Capped UCITS | 803.3 | 794.5 | 803.3 | 34.9K | 12.0 | | 1.54 | |
| ONDO | Ondo InsurTech PLC | 19.78 | 19.50 | 19.70 | 488.0K | -0.55 | | 2.72 | |
| ONT | Oxford Nanopore Technologies Ltd | 143.9 | 138.0 | 138.1 | 2.92M | -0.8 | | 0.56 | |
| ONWD | Onward Opportunities Ltd | 153.3 | 152.5 | 153.3 | 6.5K | 0.0 | | 0.00 | |
| OOA | Octopus Aim Vct PLC | 43.60 | 43.60 | 45.00 | 2.5K | 0.00 | | 0.00 | |
| OPEN | iShares Thomson Reuters Inclusion and | 10.15 | 10.13 | 10.15 | 10.6K | 0.00 | | 0.00 | |
| OPG | Opg Power Ventures PLC | 5.700 | 5.300 | 5.400 | 1.25M | 0.000 | | 0.00 | |
| OPT | Optima Health plc | 202.0 | 198.0 | 200.0 | 223.0K | 0.0 | | 0.00 | |
| OPTI | OptiBiotix Health Plc | 6.250 | 5.675 | 5.925 | 429.9K | -0.350 | | 5.60 | |
| OQ12 | Standard Chartered PLC | 92.54 | 92.54 | 92.54 | 0 | 0.00 | | 0.00 | |
| ORC1 | Orchard Bond Finance PLC | 100.1 | 100.1 | 101.2 | 0 | 0.0 | | 0.00 | |
| ORCA | Orcadian Energy PLC | 16.00 | 15.00 | 15.00 | 1.47M | 2.75 | | 21.57 | |
| ORCH | Orchard Funding Group PLC | 62.00 | 58.00 | 58.00 | 7.2K | 0.00 | | 0.00 | |
| ORCP | Oracle Coalfields Plc | 0.0470 | 0.0370 | 0.0400 | 187.78M | 0.0005 | | 1.16 | |
| ORIT | Octopus Renewables Infrastructure Trust | 59.80 | 58.00 | 58.00 | 747.3K | -0.80 | | 1.35 | |
| ORNT | Orient Telecoms | 4.000 | 3.000 | 4.000 | 17.3K | 0.000 | | 0.00 | |
| ORR | Oriole Resources PLC | 0.3390 | 0.3100 | 0.3160 | 17.79M | -0.0080 | | 2.40 | |
| OS73 | Toyota Finance Australia Limited | 95.00 | 95.00 | 95.00 | 1.0M | 0.00 | | 0.00 | |
| OSB | OneSavings Bank PLC | 636.0 | 623.0 | 630.0 | 477.6K | -5.5 | | 0.87 | |
| OSEC | Octopus Aim Vct 2 PLC | 35.45 | 35.10 | 35.40 | 403.0K | 0.00 | | 0.00 | |
| OSX5 | Source Markets Public Limited Company | 57.60 | 57.60 | 57.60 | 0 | 0.18 | | 0.31 | |
| 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 | 7.500 | 7.500 | 10.0K | 0.000 | | 0.00 | |
| OT4 | Oxford Technology 2 Venture Capital | 7.000 | 5.000 | 7.000 | 2.5K | 0.000 | | 0.00 | |
| OTB | On The Beach Group PLC | 225.0 | 218.5 | 222.0 | 223.1K | 0.5 | | 0.23 | |
| 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 | 22.21 | 22.00 | 23.50 | 28.2K | 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 | 24.60 | 24.60 | 25.70 | 6.0K | 0.00 | | 0.00 | |
| OVZA | Wisdomtree Metal Securities Limited | 182.1 | 178.1 | 180.7 | 100 | 3.8 | | 2.17 | |
| OVZB | Wisdomtree Metal Securities Limited | 145.6 | 142.8 | 143.9 | 100 | 7.4 | | 5.43 | |
| OVZC | Wisdomtree Metal Securities Limited | 62.86 | 60.52 | 62.85 | 11.0K | 3.59 | | 6.05 | |
| OXA1 | Db Etc PLC | 259.3 | 256.4 | 259.3 | 1.1K | 4.9 | | 1.92 | |
| OXA2 | Db Etc PLC | 422.0 | 407.3 | 422.0 | 100 | 22.9 | | 5.73 | |
| OXA5 | Db Etc PLC | 371.9 | 367.8 | 371.5 | 131 | 6.8 | | 1.86 | |
| OXA6 | Db Etc PLC | 644.3 | 621.8 | 643.4 | 215 | 35.0 | | 5.74 | |
| OXB | Oxford BioMedica PLC | 750.0 | 730.0 | 741.9 | 262.9K | -21.0 | | 2.80 | |
| OXH | Oxford Technology 2 Venture Capital | 7.500 | 7.500 | 6.500 | 10.0K | 0.000 | | 0.00 | |
| OXIG | Oxford Instruments PLC | 2,165 | 2,105 | 2,141 | 769.5K | -15 | | 0.71 | |
| OZ76 | Nationwide Building Society | 98.25 | 98.25 | 98.25 | 578.0K | 0.00 | | 0.00 | |