| OAP3 | Octopus Apollo VCT PLC | 46.30 | 46.30 | 46.30 | 0 | 1.50 | | 3.35 | |
| OAUE | UBS Etf | 42.76 | 42.76 | 42.76 | 1.2K | 0.00 | | 0.00 | |
| OBD | Oxford Biodynamics PLC | 0.2900 | 0.2500 | 0.2600 | 12.12M | -0.0280 | | 9.72 | |
| OBI | Ondine Biomedical Inc | 9.000 | 8.000 | 8.500 | 491.4K | -0.244 | | 2.79 | |
| OCDO | Ocado Group PLC | 252.1 | 240.2 | 242.2 | 1.97M | -6.5 | | 2.62 | |
| OCI | Oakley Capital Investments Limited | 555.0 | 548.0 | 548.0 | 103.6K | -6.0 | | 1.08 | |
| OCN | Ocean Wilsons (Holdings) LD | 1,200 | 1,175 | 1,180 | 33.8K | 0 | | 0.00 | |
| OCTF | First Trust Global Funds Public Limited | 2,020 | 2,020 | 2,020 | 0 | -20 | | 0.96 | |
| 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 | 200.0K | 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 | 393.1 | 391.4 | 391.4 | 434 | 5.9 | | 1.53 | |
| OGLD | Deutsche Boerse Commodities Gmbh | 138.5 | 137.3 | 137.4 | 9.9K | 1.0 | | 0.76 | |
| OGN | Origin Enterprises Plc | 4.170 | 4.110 | 4.110 | 1.7K | -0.035 | | 0.84 | |
| OGOL | Global X Metal Securities | 56.35 | 56.35 | 56.35 | 3 | 0.00 | | 0.00 | |
| OGZU | Wisdomtree Metal Securities Limited | 411.5 | 408.8 | 410.5 | 100 | 6.8 | | 1.68 | |
| OHGR | One Health Group Plc | 252.4 | 249.2 | 250.0 | 6.3K | 0.8 | | 0.31 | |
| OI20 | Kingdom Of Saudi Arabia (The) | 105.3 | 105.3 | 105.3 | 11.0M | 0.0 | | 0.00 | |
| OIG | Oryx International Growth Fund | 1,280 | 1,227 | 1,265 | 6.3K | 33 | | 2.68 | |
| OIGB | Vaneck Ucits Etfs Plc - Vaneck Oil | 20.43 | 20.05 | 20.22 | 13.5K | -0.24 | | 1.16 | |
| 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 | 27.82 | 27.46 | 27.69 | 19.9K | -0.23 | | 0.82 | |
| OIL2 | Wisdomtree Commodity Securities Limited | 694.1 | 678.4 | 678.4 | 137 | -15.9 | | 2.29 | |
| OIL3 | UBS AG | 85.84 | 85.84 | 85.84 | 0 | -0.50 | | 0.58 | |
| OILG | UBS AG UBS ETC (CMCI WTI) GBP | 7,726 | 7,726 | 7,726 | 0 | -41 | | 0.53 | |
| OILU | UBS AG | 126.6 | 126.6 | 126.6 | 0 | -0.6 | | 0.47 | |
| OIP9 | Shell International Finance B.V | 97.70 | 97.70 | 97.70 | 0 | 0.00 | | 0.00 | |
| OIT | Odyssean Investment Trust PLC | 175.0 | 172.0 | 174.3 | 269.4K | 2.2 | | 1.26 | |
| OM9S | Yorkshire Water Finance PLC | 69.60 | 69.60 | 69.60 | 100.0K | 0.00 | | 0.00 | |
| OMG | Oxford Metrics plc | 56.00 | 54.00 | 56.00 | 298.1K | 1.00 | | 1.82 | |
| OMI | Orosur Mining Inc | 41.00 | 37.50 | 39.00 | 9.6M | 1.75 | | 4.70 | |
| OMIP | One Media iP Group Plc | 3.750 | 3.750 | 3.750 | 0 | 0.000 | | 0.00 | |
| OMU | Old Mutual Ltd | 69.80 | 68.20 | 69.40 | 19.5K | -0.20 | | 0.29 | |
| OMXS | iShares OMX Stockholm Capped UCITS | 819.4 | 814.3 | 818.1 | 24.9K | 5.4 | | 0.66 | |
| ONDO | Ondo InsurTech PLC | 18.50 | 17.50 | 18.00 | 1.27M | -0.20 | | 1.10 | |
| ONT | Oxford Nanopore Technologies Ltd | 171.9 | 166.8 | 170.5 | 1.54M | -0.5 | | 0.29 | |
| ONWD | Onward Opportunities Ltd | 149.4 | 147.8 | 148.5 | 12.9K | 0.7 | | 0.45 | |
| OOA | Octopus Aim Vct PLC | 45.40 | 45.40 | 45.40 | 43.7K | 0.00 | | 0.00 | |
| OPEN | iShares Thomson Reuters Inclusion and | 10.32 | 10.27 | 10.32 | 1.5K | 0.10 | | 0.99 | |
| OPG | Opg Power Ventures PLC | 5.700 | 5.300 | 5.400 | 1.25M | 0.000 | | 0.00 | |
| OPT | Optima Health plc | 217.8 | 214.0 | 216.0 | 28.8K | -2.0 | | 0.92 | |
| OPTI | OptiBiotix Health Plc | 8.500 | 8.000 | 8.350 | 385.2K | 0.516 | | 6.59 | |
| OQ12 | Standard Chartered PLC | 92.54 | 92.54 | 92.54 | 0 | 0.00 | | 0.00 | |
| ORC1 | Orchard Bond Finance PLC | 100.6 | 100.6 | 101.4 | 0 | 0.0 | | 0.00 | |
| ORCA | Orcadian Energy PLC | 20.00 | 18.00 | 19.00 | 108.3K | 0.45 | | 2.43 | |
| ORCH | Orchard Funding Group PLC | 61.00 | 59.00 | 60.00 | 21.9K | -0.16 | | 0.26 | |
| ORCP | Oracle Coalfields Plc | 0.0650 | 0.0550 | 0.0630 | 400.21M | 0.0080 | | 14.55 | |
| ORIT | Octopus Renewables Infrastructure Trust | 60.00 | 57.50 | 57.60 | 1.34M | -0.60 | | 1.03 | |
| ORNT | Orient Telecoms | 4.000 | 4.000 | 4.000 | 0 | 0.000 | | 0.00 | |
| ORR | Oriole Resources PLC | 0.3900 | 0.3360 | 0.3500 | 105.05M | 0.0100 | | 2.94 | |
| OS73 | Toyota Finance Australia Limited | 95.93 | 95.93 | 95.93 | 0 | 0.00 | | 0.00 | |
| OSB | OneSavings Bank PLC | 634.5 | 621.5 | 630.0 | 1.3M | 5.0 | | 0.80 | |
| OSEC | Octopus Aim Vct 2 PLC | 36.00 | 36.00 | 36.00 | 30.2K | 0.00 | | 0.00 | |
| OSX5 | Source Markets Public Limited Company | 57.61 | 57.61 | 57.61 | 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 | 14.50 | 14.50 | 14.50 | 0 | 0.00 | | 0.00 | |
| OT3 | Oxford Technology 2 Venture Capital | 7.500 | 7.500 | 7.500 | 0 | 0.000 | | 0.00 | |
| OT4 | Oxford Technology 2 Venture Capital | 7.000 | 7.000 | 7.000 | 0 | 0.000 | | 0.00 | |
| OTB | On The Beach Group PLC | 218.0 | 214.4 | 217.5 | 436.0K | 1.0 | | 0.46 | |
| OTES | Hellenic Telecommunications Organization | 9.990 | 9.990 | 9.990 | 11 | 0.000 | | 0.00 | |
| OTPD | OTP Bank Plc | 17.00 | 17.00 | 17.00 | 0 | 0.00 | | 0.00 | |
| OTV2 | Octopus Titan VCT | 21.50 | 15.00 | 21.50 | 10.2K | 6.50 | | 43.33 | |
| 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 | 0.00 | | 0.00 | |
| OVZA | Wisdomtree Metal Securities Limited | 224.8 | 215.7 | 218.0 | 457 | 4.9 | | 2.31 | |
| OVZB | Wisdomtree Metal Securities Limited | 166.7 | 158.9 | 165.0 | 141 | 7.9 | | 5.06 | |
| OVZC | Wisdomtree Metal Securities Limited | 87.31 | 83.29 | 86.58 | 21.4K | 8.45 | | 10.81 | |
| OXA1 | Db Etc PLC | 292.3 | 290.6 | 290.9 | 20.1K | 6.6 | | 2.33 | |
| OXA2 | Db Etc PLC | 596.4 | 570.6 | 591.4 | 535 | 61.5 | | 11.60 | |
| OXA5 | Db Etc PLC | 413.0 | 409.6 | 411.0 | 428 | 6.9 | | 1.70 | |
| OXA6 | Db Etc PLC | 894.9 | 746.2 | 746.2 | 1.0K | -54.6 | | 6.81 | |
| OXB | Oxford BioMedica PLC | 880.0 | 854.1 | 864.0 | 114.5K | -7.0 | | 0.80 | |
| OXH | Oxford Technology 2 Venture Capital | 6.500 | 6.500 | 6.500 | 0 | 0.000 | | 0.00 | |
| OXIG | Oxford Instruments PLC | 2,525 | 2,470 | 2,525 | 148.9K | 20 | | 0.80 | |
| OZ76 | Nationwide Building Society | 98.25 | 98.25 | 98.25 | 578.0K | 0.00 | | 0.00 | |