| OAP3 | Octopus Apollo Vct Plc | 46.30 | 43.75 | 46.30 | 94.8K | 0.00 | | 0.00 | |
| OAUE | UBS Etf | 42.76 | 42.76 | 42.76 | 571 | 0.00 | | 0.00 | |
| OBD | Oxford Biodynamics Plc | 0.3200 | 0.2700 | 0.2900 | 18.46M | -0.0250 | | 7.94 | |
| OBI | Ondine Biomedical Inc | 10.000 | 9.000 | 9.500 | 1.9K | 0.000 | | 0.00 | |
| OCDO | Ocado Group Plc | 238.5 | 224.8 | 234.9 | 2.26M | 6.9 | | 3.03 | |
| OCI | Oakley Capital Investments Limited | 550.0 | 538.0 | 542.0 | 54.9K | -2.0 | | 0.37 | |
| OCN | Ocean Wilsons (Holdings) LD | 1,200 | 1,175 | 1,180 | 33.8K | 0 | | 0.00 | |
| OCTF | First Trust Global Funds Public Limited | 2,048 | 2,048 | 2,048 | 0 | 10 | | 0.49 | |
| 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 | Oil and Gas Development Company Limited | 8.000 | 8.000 | 8.000 | 0 | 0.000 | | 0.00 | |
| OGG9 | Gold Bullion Securities LD | 387.0 | 380.5 | 386.9 | 0 | 0.0 | | 0.00 | |
| OGLD | Deutsche Boerse Commodities Gmbh | 137.2 | 135.9 | 136.5 | 2.0K | 0.6 | | 0.46 | |
| OGN | Origin Enterprises Plc | 370.0 | 370.0 | 370.0 | 0 | 0.0 | | 0.00 | |
| OGOL | Global X Metal Securities | 64.67 | 64.67 | 64.67 | 100 | 8.32 | | 14.76 | |
| OGZU | Wisdomtree Metal Securities Limited | 407.9 | 404.7 | 407.9 | 0 | 3.3 | | 0.83 | |
| OHGR | One Health Group Plc | 235.4 | 233.0 | 233.0 | 1.3K | 0.0 | | 0.00 | |
| OI20 | Kingdom Of Saudi Arabia (The) | 105.5 | 105.5 | 105.5 | 0 | 0.0 | | 0.00 | |
| OIG | Oryx International Growth Fund Ltd | 1,395 | 1,366 | 1,395 | 7.9K | 0 | | 0.00 | |
| OIGB | Vaneck Oil Services Ucits ETF | 24.20 | 22.97 | 23.57 | 28.3K | 0.49 | | 2.10 | |
| 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 | 31.89 | 31.24 | 31.69 | 23.4K | 0.58 | | 1.85 | |
| OIL2 | Wisdomtree WTI Crude Oil 2X Daily Lev | 830.5 | 806.5 | 826.6 | 963 | 52.1 | | 6.73 | |
| OIL3 | UBS Etc [Cmci WTI 3M] USD | 94.34 | 94.34 | 94.34 | 0 | 2.61 | | 2.85 | |
| OILG | UBS Etc [Cmci Wti] GBP | 8,271 | 8,271 | 8,271 | 0 | 173 | | 2.14 | |
| OILU | UBS Etc [Ubs BBG CMCI WTI Crude Idx] USD | 135.6 | 135.6 | 135.6 | 0 | 2.8 | | 2.09 | |
| OIP9 | Shell International Finance B.V | 97.70 | 97.70 | 97.70 | 0 | 0.00 | | 0.00 | |
| OIT | Odyssean Investment Trust Plc | 188.0 | 182.7 | 186.0 | 55.8K | 2.0 | | 1.09 | |
| OM9S | Yorkshire Water Finance PLC | 69.60 | 69.60 | 69.60 | 100.0K | 0.00 | | 0.00 | |
| OMG | Oxford Metrics Plc | 56.80 | 54.20 | 55.60 | 127.0K | 0.20 | | 0.36 | |
| OMI | Orosur Mining Inc | 22.00 | 20.50 | 21.75 | 4.05M | -0.35 | | 1.58 | |
| OMIP | One Media Ip Group Plc | 4.000 | 3.200 | 3.600 | 53.0K | 0.000 | | 0.00 | |
| OMU | Old Mutual Limited | 76.80 | 73.20 | 75.00 | 84.9K | 0.60 | | 0.81 | |
| OMXS | Ishares Omx Stockholm Capped Ucits ETF | 850.3 | 842.5 | 847.3 | 448 | 0.1 | | 0.01 | |
| ONDO | Ondo Insurtech Plc | 17.50 | 17.00 | 17.25 | 194.1K | 0.00 | | 0.00 | |
| ONT | Oxford Nanopore Technologies Plc | 134.1 | 129.3 | 133.2 | 1.42M | 0.0 | | 0.00 | |
| ONWD | Onward Opportunities Limited | 146.0 | 145.0 | 145.5 | 66.5K | 0.0 | | 0.00 | |
| OOA | Octopus Aim Vct Plc | 44.80 | 44.30 | 44.80 | 215.7K | 0.00 | | 0.00 | |
| OPEN | Ish Re Incl / Diversity ETF | 10.42 | 10.42 | 10.42 | 0 | -0.07 | | 0.64 | |
| OPG | Opg Power Ventures PLC | 5.700 | 5.300 | 5.400 | 1.25M | 0.000 | | 0.00 | |
| OPT | Optima Health Plc | 197.0 | 188.5 | 191.0 | 131.4K | -2.0 | | 1.04 | |
| OPTI | Optibiotix Health Plc | 6.500 | 6.075 | 6.250 | 367.5K | -0.100 | | 1.57 | |
| OQ12 | Standard Chartered PLC | 92.40 | 92.40 | 92.54 | 0 | 0.00 | | 0.00 | |
| ORC1 | Orchard Bond Finance PLC | 100.9 | 100.9 | 101.4 | 0 | 0.0 | | 0.00 | |
| ORCA | Orcadian Energy Plc | 16.28 | 15.00 | 15.50 | 486.4K | -0.25 | | 1.59 | |
| ORCH | Orchard Funding Group Plc | 61.00 | 59.70 | 60.00 | 40.0K | 0.00 | | 0.00 | |
| ORCP | Oracle Power Plc | 0.0650 | 0.0500 | 0.0580 | 334.14M | 0.0030 | | 5.45 | |
| ORIT | Octopus Renewables Infrastructure Trust | 56.00 | 54.00 | 54.00 | 1.07M | -0.60 | | 1.10 | |
| 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 | 6.41M | 0.0000 | | 0.00 | |
| OS73 | Toyota Finance Australia Limited | 96.04 | 96.04 | 96.04 | 0 | 0.00 | | 0.00 | |
| OSB | Osb Group Plc | 618.5 | 594.0 | 601.0 | 653.9K | -11.5 | | 1.88 | |
| OSEC | Octopus Aim Vct 2 Plc | 35.60 | 35.20 | 35.60 | 109.0K | 0.00 | | 0.00 | |
| OSX5 | Source Markets Public Limited Company | 59.07 | 59.07 | 59.07 | 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 | 7.500 | 7.500 | 7.500 | 0 | 0.000 | | 0.00 | |
| OTB | On The Beach Group Plc | 201.0 | 196.7 | 198.8 | 359.6K | 0.0 | | 0.00 | |
| OTES | Hellenic Telecommunications Organization | 10.15 | 10.15 | 10.15 | 100 | 0.20 | | 2.01 | |
| 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 | 20.20 | 20.20 | 20.20 | 3.9K | -1.30 | | 6.05 | |
| OVB | Ovoca Bio PLC | 7.920 | 7.000 | 7.300 | 513.9K | 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 | 164.5 | 159.5 | 161.3 | 100 | -0.2 | | 0.09 | |
| OVZB | Wisdomtree Metal Securities Limited | 134.4 | 130.0 | 131.1 | 100 | -3.2 | | 2.38 | |
| OVZC | Wisdomtree Metal Securities Limited | 61.33 | 59.86 | 60.44 | 3.2K | 0.37 | | 0.61 | |
| OXA1 | Physical Gold Euro Hdg Etc | 286.6 | 284.5 | 285.2 | 100 | -0.2 | | 0.07 | |
| OXA2 | Physical Silver Euro Hdg Etc | 414.4 | 404.1 | 408.5 | 100 | 0.7 | | 0.18 | |
| OXA5 | Physical Gold Etc 27/08/60 | 408.4 | 405.4 | 408.4 | 0 | 2.8 | | 0.70 | |
| OXA6 | Physical Silver Etc 27/08/60 | 628.9 | 575.4 | 575.4 | 112 | -30.5 | | 5.03 | |
| OXB | Oxford Biomedica Plc | 809.0 | 780.0 | 790.0 | 144.1K | -17.0 | | 2.11 | |
| OXH | Oxford Technology 2 Venture Capital | 7.000 | 7.000 | 7.000 | 0 | 0.000 | | 0.00 | |
| OXIG | Oxford Instruments Plc | 2,680 | 2,600 | 2,615 | 450.3K | -30 | | 1.13 | |
| OZ76 | Nationwide Building Society | 98.25 | 98.25 | 98.25 | 578.0K | 0.00 | | 0.00 | |