| OAP3 | Octopus Apollo VCT PLC | 47.10 | 47.10 | 47.10 | 0 | 0.00 | | 0.00 | |
| OAUE | UBS Etf | 42.76 | 42.76 | 42.76 | 73 | 0.00 | | 0.00 | |
| OBD | Oxford Biodynamics PLC | 0.3100 | 0.2530 | 0.2540 | 161.59M | -0.0410 | | 13.90 | |
| OBI | Ondine Biomedical Inc | 12.00 | 11.00 | 11.40 | 465.5K | 0.15 | | 1.33 | |
| OCDO | Ocado Group PLC | 185.0 | 180.2 | 184.4 | 1.23M | 1.5 | | 0.79 | |
| OCI | Oakley Capital Investments Limited | 556.0 | 548.0 | 556.0 | 74.6K | 2.0 | | 0.36 | |
| OCN | Ocean Wilsons Holdings Ltd | 1,160 | 1,130 | 1,145 | 15.2K | 5 | | 0.44 | |
| OCTF | First Trust Global Funds Public Limited | 2,062 | 2,061 | 2,053 | 225 | -7 | | 0.34 | |
| 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 | 320.6 | 320.6 | 320.6 | 504 | 0.0 | | 0.00 | |
| OGLD | Deutsche Boerse Commodities Gmbh | 116.8 | 115.4 | 116.7 | 1.8K | 1.6 | | 1.40 | |
| OGN | Origin Enterprises Plc | 3.775 | 3.730 | 3.730 | 367 | 0.000 | | 0.00 | |
| OGOL | Global X Metal Securities | 56.35 | 56.35 | 56.35 | 60 | 0.00 | | 0.00 | |
| OGZU | Wisdomtree Metal Securities Limited | 347.5 | 343.3 | 346.7 | 0 | 3.4 | | 1.00 | |
| OHGR | One Health Group Plc | 237.9 | 237.9 | 237.9 | 4.1K | 2.9 | | 1.23 | |
| 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 | 1,206 | 1,290 | 3.0K | 33 | | 2.58 | |
| OIGB | Vaneck Ucits Etfs Plc - Vaneck Oil | 17.57 | 17.21 | 17.57 | 3.2K | 0.32 | | 1.86 | |
| 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 | 23.07 | 22.99 | 22.99 | 1.8K | 0.11 | | 0.49 | |
| OIL2 | Wisdomtree Commodity Securities Limited | 665.5 | 663.3 | 665.5 | 102 | 3.9 | | 0.59 | |
| OIL3 | UBS AG | 86.17 | 86.17 | 83.33 | 0 | 1.13 | | 1.32 | |
| OILG | UBS AG UBS ETC (CMCI WTI) GBP | 7,872 | 7,548 | 7,548 | 0 | 27 | | 0.36 | |
| OILU | UBS AG | 129.9 | 129.9 | 123.6 | 75 | 1.4 | | 1.08 | |
| OIP9 | Shell International Finance B.V | 98.24 | 98.24 | 98.24 | 300.0K | 0.00 | | 0.00 | |
| OIT | Odyssean Investment Trust PLC | 171.5 | 166.5 | 166.9 | 201.7K | 0.9 | | 0.56 | |
| OM9S | Yorkshire Water Finance PLC | 69.60 | 69.60 | 69.60 | 100.0K | 0.00 | | 0.00 | |
| OMG | Oxford Metrics plc | 43.90 | 41.80 | 42.00 | 201.4K | -0.40 | | 0.94 | |
| OMI | Orosur Mining Inc | 23.00 | 21.50 | 22.25 | 1.93M | 0.75 | | 3.49 | |
| OMIP | One Media iP Group Plc | 3.750 | 3.501 | 3.501 | 100 | -0.249 | | 6.64 | |
| OMU | Old Mutual Ltd | 62.60 | 60.20 | 61.00 | 60.0K | 0.20 | | 0.33 | |
| OMXS | iShares OMX Stockholm Capped UCITS | 752.0 | 747.3 | 749.8 | 9.9K | 1.9 | | 0.25 | |
| ONDO | Ondo InsurTech PLC | 31.00 | 30.00 | 30.20 | 322.3K | -0.40 | | 1.31 | |
| ONT | Oxford Nanopore Technologies Ltd | 142.7 | 138.1 | 140.9 | 1.17M | 2.0 | | 1.44 | |
| ONWD | Onward Opportunities Ltd | 136.0 | 133.0 | 136.0 | 56.4K | 2.0 | | 1.49 | |
| OOA | Octopus Aim Vct PLC | 45.70 | 45.70 | 45.60 | 204.8K | 0.00 | | 0.00 | |
| OPEN | iShares Thomson Reuters Inclusion and | 9.792 | 9.516 | 9.792 | 129 | 0.020 | | 0.20 | |
| OPG | OPG Power Venture Plc | 6.000 | 5.800 | 5.900 | 710.4K | 0.000 | | 0.00 | |
| OPT | Optima Health plc | 200.0 | 196.0 | 198.2 | 91.6K | 0.2 | | 0.12 | |
| OPTI | OptiBiotix Health Plc | 8.000 | 7.620 | 7.975 | 7.1K | 0.225 | | 2.90 | |
| OQ12 | Standard Chartered PLC | 92.47 | 92.47 | 92.47 | 450.0K | 0.00 | | 0.00 | |
| ORC1 | Orchard Bond Finance PLC | 99.3 | 99.3 | 101.0 | 6.6K | 0.0 | | 0.00 | |
| ORCA | Orcadian Energy PLC | 14.00 | 12.50 | 12.78 | 155.9K | -0.23 | | 1.73 | |
| ORCH | Orchard Funding Group PLC | 60.00 | 58.00 | 59.00 | 104.8K | -0.50 | | 0.84 | |
| ORCP | Oracle Coalfields Plc | 0.0400 | 0.0320 | 0.0400 | 103.02M | 0.0020 | | 5.26 | |
| ORIT | Octopus Renewables Infrastructure Trust | 56.00 | 54.00 | 55.80 | 1.51M | 1.70 | | 3.14 | |
| ORNT | Orient Telecoms | 4.000 | 3.200 | 4.000 | 15.0K | 0.000 | | 0.00 | |
| ORR | Oriole Resources PLC | 0.2500 | 0.2200 | 0.2490 | 86.6M | 0.0240 | | 10.67 | |
| OS73 | Toyota Finance Australia Limited | 95.00 | 95.00 | 95.00 | 1.0M | 0.00 | | 0.00 | |
| OSB | OneSavings Bank PLC | 588.0 | 572.5 | 572.5 | 523.1K | -11.0 | | 1.89 | |
| OSEC | Octopus Aim Vct 2 PLC | 34.74 | 34.40 | 34.20 | 132.4K | 0.00 | | 0.00 | |
| OSX5 | Source Markets Public Limited Company | 54.69 | 54.67 | 54.67 | 0 | 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 | 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 | 191.6 | 187.0 | 189.4 | 665.0K | -1.2 | | 0.65 | |
| 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 | 18.00 | 18.00 | 24.50 | 2.9K | 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 | 24.00 | 24.00 | 25.30 | 8.1K | 0.20 | | 0.80 | |
| OVZA | Wisdomtree Metal Securities Limited | 131.6 | 123.8 | 131.1 | 100 | 4.3 | | 3.39 | |
| OVZB | Wisdomtree Metal Securities Limited | 119.0 | 110.0 | 114.0 | 125 | 1.0 | | 0.85 | |
| OVZC | Wisdomtree Metal Securities Limited | 43.90 | 42.25 | 43.75 | 1.4K | 1.88 | | 4.49 | |
| OXA1 | Db Etc PLC | 241.8 | 239.3 | 241.8 | 967 | 2.6 | | 1.07 | |
| OXA2 | Db Etc PLC | 293.9 | 283.8 | 293.9 | 148 | 13.0 | | 4.64 | |
| OXA5 | Db Etc PLC | 348.1 | 345.1 | 348.1 | 100 | 4.4 | | 1.29 | |
| OXA6 | Db Etc PLC | 449.3 | 433.4 | 448.4 | 100 | 31.5 | | 7.57 | |
| OXB | Oxford BioMedica PLC | 648.0 | 629.0 | 630.0 | 119.6K | -9.0 | | 1.41 | |
| OXH | Oxford Technology 2 Venture Capital | 7.500 | 7.500 | 6.000 | 20.0K | 0.000 | | 0.00 | |
| OXIG | Oxford Instruments PLC | 2,060 | 1,956 | 1,968 | 43.4K | 0 | | 0.01 | |
| OZ76 | Nationwide Building Society | 98.25 | 98.25 | 98.25 | 578.0K | 0.00 | | 0.00 | |