| 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 | 0.3190 | 0.2720 | 0.3000 | 47.73M | 0.0200 | | 7.14 | |
| OBI | Ondine Biomedical Inc | 8.500 | 8.000 | 8.250 | 1.45M | 0.250 | | 3.13 | |
| OCDO | Ocado Group PLC | 271.3 | 254.6 | 254.6 | 2.36M | -7.9 | | 3.01 | |
| OCI | Oakley Capital Investments Limited | 558.0 | 550.0 | 556.0 | 483.6K | 6.0 | | 1.09 | |
| OCN | Ocean Wilsons (Holdings) LD | 1,200 | 1,175 | 1,180 | 33.8K | 0 | | 0.00 | |
| OCTF | First Trust Global Funds Public Limited | 2,046 | 2,046 | 2,046 | 0 | 0 | | 0.01 | |
| OE08 | Bank Of Montreal | 100.4 | 100.4 | 100.4 | 1.0M | 0.0 | | 0.00 | |
| OE61 | The Kingdom Of Morocco | 108.0 | 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 | 377.7 | 376.8 | 376.8 | 548 | 8.2 | | 2.23 | |
| OGLD | Deutsche Boerse Commodities Gmbh | 133.6 | 132.2 | 133.6 | 3.2K | 0.6 | | 0.43 | |
| OGN | Origin Enterprises Plc | 4.110 | 4.088 | 4.110 | 1.1K | 0.060 | | 1.48 | |
| OGOL | Global X Metal Securities | 66.30 | 66.30 | 66.30 | 183 | 0.66 | | 1.01 | |
| OGZU | Wisdomtree Metal Securities Limited | 397.1 | 394.3 | 397.1 | 100 | 1.0 | | 0.25 | |
| OHGR | One Health Group Plc | 257.2 | 249.6 | 250.0 | 7.2K | -1.0 | | 0.40 | |
| OI20 | Kingdom Of Saudi Arabia (The) | 105.3 | 105.3 | 105.3 | 11.0M | 0.0 | | 0.00 | |
| OIG | Oryx International Growth Fund | 1,290 | 1,225 | 1,260 | 4.3K | 25 | | 2.02 | |
| OIGB | Vaneck Ucits Etfs Plc - Vaneck Oil | 20.46 | 20.09 | 20.31 | 25.6K | 0.18 | | 0.91 | |
| 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 | 27.42 | 27.15 | 27.34 | 27.0K | 0.23 | | 0.85 | |
| OIL2 | Wisdomtree Commodity Securities Limited | 691.3 | 668.0 | 668.0 | 4.5K | -21.3 | | 3.08 | |
| OIL3 | UBS AG | 84.66 | 84.66 | 84.66 | 0 | -0.94 | | 1.10 | |
| OILG | UBS AG UBS ETC (CMCI WTI) GBP | 7,638 | 7,638 | 7,638 | 0 | -80 | | 1.04 | |
| OILU | UBS AG | 125.1 | 125.1 | 125.1 | 0 | -1.3 | | 1.03 | |
| OIP9 | Shell International Finance B.V | 97.70 | 97.70 | 97.70 | 0 | 0.00 | | 0.00 | |
| OIT | Odyssean Investment Trust PLC | 173.0 | 170.5 | 171.8 | 131.7K | 4.0 | | 2.38 | |
| OM9S | Yorkshire Water Finance PLC | 69.60 | 69.60 | 69.60 | 100.0K | 0.00 | | 0.00 | |
| OMG | Oxford Metrics plc | 55.60 | 53.20 | 55.00 | 232.0K | 1.00 | | 1.85 | |
| OMI | Orosur Mining Inc | 36.00 | 33.50 | 35.70 | 3.23M | 0.90 | | 2.59 | |
| OMIP | One Media iP Group Plc | 3.750 | 3.750 | 3.750 | 0 | 0.000 | | 0.00 | |
| OMU | Old Mutual Ltd | 70.60 | 68.80 | 69.60 | 48.8K | 1.60 | | 2.35 | |
| OMXS | iShares OMX Stockholm Capped UCITS | 823.8 | 814.5 | 814.5 | 6.7K | 10.3 | | 1.27 | |
| ONDO | Ondo InsurTech PLC | 18.00 | 17.00 | 18.00 | 1.72M | 0.75 | | 4.35 | |
| ONT | Oxford Nanopore Technologies Ltd | 174.7 | 159.1 | 172.9 | 2.83M | 12.0 | | 7.46 | |
| ONWD | Onward Opportunities Ltd | 148.8 | 147.1 | 148.0 | 31.8K | 0.0 | | 0.00 | |
| OOA | Octopus Aim Vct Plc | 45.55 | 45.10 | 45.40 | 198.0K | 0.00 | | 0.00 | |
| OPEN | iShares Thomson Reuters Inclusion and | 10.29 | 10.28 | 10.29 | 100 | 0.16 | | 1.57 | |
| OPG | Opg Power Ventures PLC | 5.700 | 5.300 | 5.400 | 1.25M | 0.000 | | 0.00 | |
| OPT | Optima Health plc | 218.0 | 214.0 | 216.0 | 63.1K | -1.0 | | 0.46 | |
| OPTI | OptiBiotix Health Plc | 8.500 | 7.600 | 8.000 | 1.24M | 0.400 | | 5.26 | |
| OQ12 | Standard Chartered PLC | 92.54 | 92.54 | 92.54 | 0 | 0.00 | | 0.00 | |
| ORC1 | Orchard Bond Finance PLC | 103.7 | 103.7 | 101.3 | 0 | 0.0 | | 0.00 | |
| ORCA | Orcadian Energy PLC | 19.00 | 18.50 | 19.00 | 27.9K | 0.00 | | 0.00 | |
| ORCH | Orchard Funding Group PLC | 61.00 | 59.00 | 60.00 | 3.3K | 0.00 | | 0.00 | |
| ORCP | Oracle Coalfields Plc | 0.0600 | 0.0500 | 0.0580 | 493.46M | -0.0010 | | 1.69 | |
| ORIT | Octopus Renewables Infrastructure Trust | 59.03 | 57.50 | 57.60 | 1.46M | 0.10 | | 0.17 | |
| ORNT | Orient Telecoms | 4.000 | 4.000 | 4.000 | 0 | 0.000 | | 0.00 | |
| ORR | Oriole Resources PLC | 0.3500 | 0.3300 | 0.3400 | 13.81M | 0.0000 | | 0.00 | |
| OS73 | Toyota Finance Australia Limited | 95.93 | 95.93 | 95.93 | 0 | 0.03 | | 0.03 | |
| OSB | OneSavings Bank PLC | 636.5 | 618.5 | 629.0 | 1.53M | 5.0 | | 0.80 | |
| OSEC | Octopus Aim VCT 2 PLC | 36.26 | 35.00 | 36.00 | 209.6K | 0.00 | | 0.00 | |
| OSX5 | Source Markets Public Limited Company | 57.78 | 57.78 | 57.78 | 0 | 0.88 | | 1.55 | |
| 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 | 218.5 | 207.0 | 218.5 | 357.3K | 7.0 | | 3.31 | |
| 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 | 21.50 | 21.50 | 21.50 | 0 | 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 | 25.70 | 25.70 | 25.70 | 0 | 0.00 | | 0.00 | |
| OVZA | Wisdomtree Metal Securities Limited | 198.9 | 191.5 | 198.5 | 100 | 0.3 | | 0.15 | |
| OVZB | Wisdomtree Metal Securities Limited | 146.5 | 144.1 | 146.2 | 100 | 0.2 | | 0.12 | |
| OVZC | Wisdomtree Metal Securities Limited | 74.50 | 72.46 | 74.19 | 8.9K | 1.31 | | 1.80 | |
| OXA1 | Db Etc PLC | 277.9 | 276.2 | 276.9 | 390 | -0.4 | | 0.15 | |
| OXA2 | Db Etc PLC | 503.5 | 489.9 | 502.1 | 125 | 9.2 | | 1.87 | |
| OXA5 | Db Etc PLC | 398.4 | 394.9 | 398.4 | 100 | 1.8 | | 0.44 | |
| OXA6 | Db Etc PLC | 763.3 | 744.5 | 754.8 | 100 | 4.2 | | 0.56 | |
| OXB | Oxford BioMedica PLC | 900.0 | 849.1 | 853.0 | 362.9K | -22.0 | | 2.51 | |
| OXH | Oxford Technology 2 Venture Capital | 6.500 | 6.500 | 6.500 | 0 | 0.000 | | 0.00 | |
| OXIG | Oxford Instruments PLC | 2,530 | 2,424 | 2,500 | 378.1K | 85 | | 3.52 | |
| OZ76 | Nationwide Building Society | 98.25 | 98.25 | 98.25 | 578.0K | 0.00 | | 0.00 | |