| OAP3 | Octopus Apollo Vct Plc | 48.20 | 45.20 | 46.70 | 100 | -1.50 | | 3.11 | |
| OAUE | UBS Etf | 125.6 | 125.6 | 125.6 | 219 | 0.0 | | 0.00 | |
| OBD | Oxford Biodynamics Plc | 0.2000 | 0.1700 | 0.1850 | 10.0M | 0.0050 | | 2.78 | |
| OBI | Ondine Biomedical Inc | 15.30 | 13.50 | 15.00 | 1.72M | 1.00 | | 7.14 | |
| OCDO | Ocado Group Plc | 199.1 | 193.1 | 195.7 | 1.46M | -1.5 | | 0.76 | |
| OCI | Oakley Capital Investments Limited | 475.6 | 458.0 | 460.0 | 355.8K | -15.0 | | 3.16 | |
| OCTF | First Trust Global Funds Icav | 2,116 | 2,109 | 2,109 | 100 | -5 | | 0.24 | |
| OE08 | Bank Of Montreal | 100.4 | 100.4 | 100.4 | 1.0M | 0.0 | | 0.00 | |
| OE61 | The Kingdom Of Morocco | 107.1 | 107.1 | 107.1 | 0 | 0.0 | | 0.00 | |
| OFG | Octopus Future Generations Vct Plc | 77.00 | 77.00 | 77.00 | 0 | 0.00 | | 0.00 | |
| OGDC | Oil and Gas Development Company Limited | 8.050 | 8.050 | 8.050 | 0 | 0.000 | | 0.00 | |
| OGG9 | Gold Bullion Securities | 366.1 | 366.1 | 366.1 | 3.6K | -1.6 | | 0.43 | |
| OGLD | Deutsche Boerse Commodities Gmbh | 129.6 | 127.6 | 129.6 | 600 | 0.1 | | 0.11 | |
| OGN | Origin Enterprises Plc | 397.5 | 391.5 | 397.5 | 4.0K | 0.0 | | 0.00 | |
| OGOL | Global X Metal Securities | 58.95 | 58.95 | 58.95 | 931 | 2.60 | | 4.61 | |
| OGZU | Wisdomtree Metal Securities Limited | 383.6 | 379.1 | 382.8 | 100 | -0.5 | | 0.12 | |
| OHGR | One Health Group Plc | 252.0 | 248.5 | 249.5 | 5.0K | 1.0 | | 0.40 | |
| OI20 | Kingdom Of Saudi Arabia (The) | 101.5 | 101.5 | 101.5 | 0 | 0.0 | | 0.00 | |
| OIG | Oryx International Growth Fund Ltd | 1,279 | 1,252 | 1,270 | 1.2K | 30 | | 2.42 | |
| OIGB | Vaneck Oil Services Ucits ETF | 25.80 | 25.41 | 25.66 | 19.2K | 0.18 | | 0.69 | |
| OIH | Orascom Investment Holding S.A.E | 0.0150 | 0.0140 | 0.0140 | 1.8K | 0.0000 | | 0.00 | |
| OIHV | Vaneck Oil Services Ucits ETF | 35.39 | 34.63 | 34.90 | 13.8K | 0.34 | | 0.98 | |
| OIL2 | Wisdomtree WTI Crude Oil 2X Daily Lev | 1,825 | 1,747 | 1,778 | 606 | 69 | | 4.05 | |
| OIL3 | UBS Etc [Cmci WTI 3M] USD | 132.1 | 132.1 | 132.1 | 0 | 0.0 | | 0.00 | |
| OILG | UBS Etc [Cmci Wti] GBP | 10,408 | 10,408 | 10,408 | 0 | 0 | | 0.00 | |
| OILU | UBS Etc [Ubs BBG CMCI WTI Crude Idx] USD | 183.6 | 183.6 | 183.6 | 0 | 3.5 | | 1.93 | |
| OIP9 | Shell International Finance B.V | 97.52 | 97.52 | 97.52 | 0 | 0.00 | | 0.00 | |
| OIT | Odyssean Investment Trust Plc | 208.0 | 202.0 | 205.0 | 130.1K | 3.0 | | 1.49 | |
| OKL3 | Leverage Shares Public Limited Company | 0.0000 | 0.0000 | 0.0000 | 0 | 0.0000 | | NaN | |
| OKL3 | Leverage Shares Public Limited Company | 11.08 | 9.66 | 10.28 | 322 | 0.00 | | NaN | |
| OKL3 | Leverage Shares Public Limited Company | 0.0000 | 0.0000 | 0.0000 | 0 | 0.0000 | | NaN | |
| OKL3 | Leverage Shares Public Limited Company | 0.0000 | 0.0000 | 0.0000 | 0 | 0.0000 | | NaN | |
| OKL3 | Leverage Shares Public Limited Company | 0.0000 | 0.0000 | 0.0000 | 0 | 0.0000 | | NaN | |
| OKL3 | Leverage Shares Public Limited Company | 0.0000 | 0.0000 | 0.0000 | 0 | 0.0000 | | NaN | |
| OKL3 | Leverage Shares Public Limited Company | 0.0000 | 0.0000 | 0.0000 | 0 | 0.0000 | | NaN | |
| OKL3 | Leverage Shares Public Limited Company | 11.08 | 9.66 | 10.28 | 322 | 0.00 | | NaN | |
| OKL3 | Leverage Shares Public Limited Company | 12.50 | 9.28 | 12.50 | 423 | 3.08 | | 32.63 | |
| OM9S | Yorkshire Water Finance PLC | 77.40 | 77.40 | 77.40 | 0 | 0.00 | | 0.00 | |
| OMG | Oxford Metrics Plc | 48.00 | 46.20 | 48.00 | 166.7K | 0.00 | | 0.00 | |
| OMI | Orosur Mining Inc | 20.00 | 19.00 | 19.20 | 1.14M | -0.80 | | 4.00 | |
| OMIP | One Media Ip Group Plc | 4.300 | 4.050 | 4.050 | 100 | 0.000 | | 0.00 | |
| OMU | Old Mutual Limited | 60.00 | 58.40 | 59.00 | 172.9K | -1.00 | | 1.67 | |
| OMXS | Ishares Omx Stockholm Capped Ucits ETF | 827.0 | 818.9 | 824.3 | 22.4K | 2.4 | | 0.29 | |
| ONDO | Ondo Insurtech Plc | 3.750 | 2.810 | 3.240 | 3.43M | -0.385 | | 10.62 | |
| ONT | Oxford Nanopore Technologies Plc | 115.3 | 111.4 | 115.2 | 1.38M | 2.1 | | 1.86 | |
| ONWD | Onward Opportunities Limited | 127.3 | 124.0 | 126.0 | 42.9K | 0.0 | | 0.00 | |
| OOA | Octopus Aim Vct Plc | 39.20 | 39.20 | 39.20 | 0 | -0.40 | | 1.01 | |
| OPEN | Ish Re Incl / Diversity ETF | 11.00 | 10.98 | 10.98 | 100 | -0.01 | | 0.13 | |
| OPT | Optima Health Plc | 192.0 | 187.0 | 192.0 | 1.75M | 2.5 | | 1.32 | |
| OPTI | Optibiotix Health Plc | 5.120 | 5.000 | 5.100 | 72.4K | 0.000 | | 0.00 | |
| OQ12 | Standard Chartered PLC | 91.37 | 91.37 | 91.02 | 0 | 0.00 | | 0.00 | |
| ORC1 | Orchard Bond Finance PLC | 99.30 | 97.00 | 98.65 | 0 | -1.48 | | 1.47 | |
| ORC3 | Leverage Shares Public Limited Company | 15.39 | 15.19 | 15.20 | 2.6K | -0.98 | | 6.06 | |
| ORCA | Orcadian Energy Plc | 16.00 | 14.00 | 15.00 | 65.2K | 0.00 | | 0.00 | |
| ORCH | Orchard Funding Group Plc | 57.00 | 55.00 | 56.00 | 22.5K | 0.00 | | 0.00 | |
| ORCP | Oracle Power Plc | 0.0600 | 0.0500 | 0.0500 | 216.82M | -0.0025 | | 4.76 | |
| ORCY | Leverage Shares Public Limited Company | 11.02 | 11.01 | 11.01 | 100 | -0.15 | | 1.32 | |
| ORIT | Octopus Renewables Infrastructure Trust | 61.00 | 59.00 | 61.00 | 794.2K | 1.00 | | 1.67 | |
| ORNT | Orient Telecoms Plc | 4.000 | 4.000 | 4.000 | 0 | 0.000 | | 0.00 | |
| ORR | Oriole Resources Plc | 0.3400 | 0.3100 | 0.3250 | 28.92M | 0.0050 | | 1.56 | |
| OS73 | Toyota Finance Australia Limited | 95.17 | 95.17 | 95.17 | 0 | 0.00 | | 0.00 | |
| OSB | Osb Group Plc | 516.5 | 509.8 | 511.0 | 664.6K | -3.5 | | 0.68 | |
| OSEC | Octopus Aim Vct 2 Plc | 29.60 | 29.60 | 29.60 | 0 | -0.20 | | 0.67 | |
| OSX5 | Source Markets Public Limited Company | 58.10 | 58.09 | 58.10 | 21 | 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 | 15.50 | 15.50 | 15.50 | 0 | 1.00 | | 6.90 | |
| OT3 | Oxford Technology 2 Venture Capital | 8.000 | 8.000 | 8.000 | 0 | 0.500 | | 6.67 | |
| OT4 | Oxford Technology 2 Venture Capital | 9.500 | 8.000 | 8.000 | 15.0K | 0.500 | | 6.67 | |
| OTB | On The Beach Group Plc | 173.6 | 167.2 | 169.6 | 1.13M | -2.4 | | 1.40 | |
| OTES | Hellenic Telecommunications Organization | 10.96 | 10.80 | 10.96 | 1 | 0.00 | | 0.00 | |
| OTPD | Gdr [Each Repr 1/2 Ord Huf100][Reg S] | 17.00 | 17.00 | 17.00 | 0 | 0.00 | | 0.00 | |
| OTV2 | Octopus Titan Vct Plc | 19.50 | 19.50 | 19.50 | 0 | 0.00 | | 0.00 | |
| OVCT | Oberon Aim Vct Plc | 23.50 | 20.00 | 23.50 | 1.0K | 0.00 | | 0.00 | |
| OVZA | Wisdomtree Metal Securities Limited | 165.0 | 156.7 | 165.0 | 100 | 7.4 | | 4.66 | |
| OVZB | Wisdomtree Metal Securities Limited | 117.2 | 113.6 | 117.2 | 100 | 2.2 | | 1.89 | |
| OVZC | Wisdomtree Metal Securities Limited | 66.34 | 61.94 | 62.21 | 29.9K | 0.04 | | 0.07 | |
| OXA1 | Physical Gold Euro Hdg Etc | 268.5 | 264.3 | 268.5 | 225 | 1.5 | | 0.58 | |
| OXA2 | Db Etc PLC | 421.3 | 418.7 | 420.4 | 72 | 0.0 | | 0.00 | |
| OXA5 | Physical Gold Etc 27/08/60 | 385.6 | 385.6 | 385.6 | 0 | 1.9 | | 0.50 | |
| OXA6 | Physical Silver Etc 27/08/60 | 602.1 | 602.1 | 602.1 | 100 | 16.0 | | 2.72 | |
| OXB | Oxford Biomedica Plc | 655.0 | 618.0 | 647.0 | 272.1K | -2.0 | | 0.31 | |
| OXH | Oxford Technology 2 Venture Capital | 7.500 | 7.500 | 7.500 | 0 | 0.500 | | 7.14 | |
| OXIG | Oxford Instruments Plc | 2,990 | 2,920 | 2,960 | 304.6K | 0 | | 0.00 | |
| OZ76 | Nationwide Building Society | 98.25 | 98.25 | 98.25 | 578.0K | 0.00 | | 0.00 | |