| OAP3 | Octopus Apollo Vct Plc | 46.30 | 46.30 | 46.30 | 100 | 0.00 | | 0.00 | |
| OAUE | UBS Etf | 42.76 | 42.76 | 42.76 | 19 | 0.00 | | 0.00 | |
| OBD | Oxford Biodynamics Plc | 0.2600 | 0.2400 | 0.2500 | 1.79M | 0.0000 | | 0.00 | |
| OBI | Ondine Biomedical Inc | 10.50 | 10.00 | 10.25 | 78.1K | 0.00 | | 0.00 | |
| OCDO | Ocado Group Plc | 207.5 | 196.3 | 196.3 | 1.62M | -4.7 | | 2.34 | |
| OCI | Oakley Capital Investments Limited | 500.0 | 488.0 | 488.0 | 63.0K | -6.0 | | 1.21 | |
| OCTF | First Trust Global Funds Public Limited | 2,049 | 2,049 | 2,049 | 0 | -7 | | 0.33 | |
| 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 | 8.200 | 8.200 | 8.200 | 0 | 0.000 | | 0.00 | |
| OGG9 | Gold Bullion Securities | 416.0 | 406.6 | 416.0 | 0 | -6.0 | | 1.42 | |
| OGLD | Deutsche Boerse Commodities Gmbh | 143.3 | 140.4 | 140.9 | 2.5K | -7.6 | | 5.10 | |
| OGN | Origin Enterprises Plc | 370.0 | 370.0 | 370.0 | 0 | 0.0 | | 0.00 | |
| OGOL | Global X Metal Securities | 67.14 | 67.14 | 67.14 | 977 | -0.40 | | 0.59 | |
| OGZU | Wisdomtree Metal Securities Limited | 426.2 | 419.5 | 423.6 | 0 | -9.5 | | 2.18 | |
| OHGR | One Health Group Plc | 251.1 | 249.0 | 249.0 | 2.0K | 0.0 | | 0.00 | |
| OI20 | Kingdom Of Saudi Arabia (The) | 105.8 | 105.8 | 105.8 | 0 | 0.0 | | 0.00 | |
| OIG | Oryx International Growth Fund Ltd | 1,295 | 1,231 | 1,270 | 6.4K | -30 | | 2.31 | |
| OIGB | Vaneck Oil Services Ucits ETF | 23.77 | 23.13 | 23.19 | 22.7K | -0.15 | | 0.62 | |
| 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 | 31.60 | 30.79 | 30.82 | 105.7K | -0.55 | | 1.74 | |
| OIL2 | Wisdomtree WTI Crude Oil 2X Daily Lev | 1,144 | 1,055 | 1,140 | 23.8K | 136 | | 13.55 | |
| OIL3 | UBS Etc [Cmci WTI 3M] USD | 106.6 | 106.6 | 106.6 | 0 | 4.8 | | 4.74 | |
| OILG | UBS Etc [Cmci Wti] GBP | 9,006 | 9,006 | 9,006 | 0 | 306 | | 3.52 | |
| OILU | UBS Etc [Ubs BBG CMCI WTI Crude Idx] USD | 147.5 | 147.5 | 147.5 | 0 | 4.9 | | 3.44 | |
| OIP9 | Shell International Finance B.V | 97.70 | 97.70 | 97.70 | 0 | 0.00 | | 0.00 | |
| OIT | Odyssean Investment Trust Plc | 188.0 | 185.0 | 186.5 | 69.8K | 1.0 | | 0.54 | |
| OM9S | Yorkshire Water Finance PLC | 69.60 | 69.60 | 69.60 | 100.0K | 0.00 | | 0.00 | |
| OMG | Oxford Metrics Plc | 51.60 | 48.83 | 49.60 | 598.6K | -0.40 | | 0.80 | |
| OMI | Orosur Mining Inc | 22.70 | 20.00 | 20.75 | 4.0M | 0.00 | | 0.00 | |
| OMIP | One Media Ip Group Plc | 3.500 | 3.500 | 3.500 | 0 | 0.000 | | 0.00 | |
| OMU | Old Mutual Limited | 70.60 | 67.20 | 67.20 | 80.0K | -2.80 | | 4.00 | |
| OMXS | Ishares Omx Stockholm Capped Ucits ETF | 837.0 | 818.0 | 818.0 | 16.3K | -17.8 | | 2.12 | |
| ONDO | Ondo Insurtech Plc | 16.54 | 16.25 | 16.25 | 574.4K | -0.25 | | 1.52 | |
| ONT | Oxford Nanopore Technologies Plc | 126.9 | 122.3 | 124.0 | 1.21M | -0.4 | | 0.32 | |
| ONWD | Onward Opportunities Limited | 142.2 | 140.0 | 141.5 | 29.8K | -1.5 | | 1.05 | |
| OOA | Octopus Aim Vct Plc | 44.20 | 44.20 | 44.20 | 32.2K | -1.40 | | 3.07 | |
| OPEN | Ish Re Incl / Diversity ETF | 10.14 | 10.14 | 10.14 | 14.9K | -0.18 | | 1.74 | |
| OPT | Optima Health Plc | 185.0 | 180.0 | 182.5 | 45.8K | 0.0 | | 0.00 | |
| OPTI | Optibiotix Health Plc | 6.000 | 5.733 | 5.750 | 142.2K | 0.000 | | 0.00 | |
| OQ12 | Standard Chartered PLC | 92.40 | 92.40 | 92.54 | 0 | 0.00 | | 0.00 | |
| ORC1 | Orchard Bond Finance PLC | 100.9 | 100.9 | 101.1 | 0 | 0.0 | | 0.00 | |
| ORCA | Orcadian Energy Plc | 17.50 | 16.30 | 16.75 | 37.9K | 0.00 | | 0.00 | |
| ORCH | Orchard Funding Group Plc | 60.00 | 59.25 | 60.00 | 8.1K | 0.00 | | 0.00 | |
| ORCP | Oracle Power Plc | 0.0600 | 0.0550 | 0.0570 | 128.9M | -0.0010 | | 1.72 | |
| ORIT | Octopus Renewables Infrastructure Trust | 55.00 | 53.00 | 55.00 | 1.81M | 0.90 | | 1.66 | |
| ORNT | Orient Telecoms Plc | 4.000 | 4.000 | 4.000 | 0 | 0.000 | | 0.00 | |
| ORR | Oriole Resources Plc | 0.3290 | 0.3150 | 0.3150 | 2.52M | -0.0150 | | 4.55 | |
| OS73 | Toyota Finance Australia Limited | 96.04 | 96.04 | 96.04 | 0 | 0.00 | | 0.00 | |
| OSB | Osb Group Plc | 584.5 | 547.5 | 574.5 | 1.6M | 7.0 | | 1.23 | |
| OSEC | Octopus Aim Vct 2 Plc | 35.00 | 35.00 | 35.00 | 0 | 0.00 | | 0.00 | |
| OSX5 | Source Markets Public Limited Company | 56.07 | 55.99 | 55.99 | 17.9K | -2.33 | | 3.90 | |
| 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 | 198.0 | 192.0 | 196.0 | 506.9K | 1.0 | | 0.51 | |
| OTES | Hellenic Telecommunications Organization | 9.850 | 9.750 | 9.750 | 1 | 0.000 | | 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 | 23.00 | 15.00 | 21.50 | 102.8K | 0.00 | | 0.00 | |
| 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 | 174.1 | 166.8 | 174.1 | 100 | -6.9 | | 3.79 | |
| OVZB | Wisdomtree Metal Securities Limited | 131.6 | 128.0 | 131.5 | 100 | 0.3 | | 0.23 | |
| OVZC | Wisdomtree Metal Securities Limited | 68.62 | 64.12 | 68.62 | 2.0K | -5.43 | | 7.33 | |
| OXA1 | Physical Gold Euro Hdg Etc | 294.3 | 288.6 | 288.6 | 283 | -14.1 | | 4.67 | |
| OXA2 | Physical Silver Euro Hdg Etc | 440.7 | 425.0 | 425.0 | 100 | -17.6 | | 3.97 | |
| OXA5 | Physical Gold Etc 27/08/60 | 427.2 | 412.0 | 423.6 | 100 | -11.3 | | 2.61 | |
| OXA6 | Physical Silver Etc 27/08/60 | 700.0 | 657.7 | 700.0 | 112 | -63.9 | | 8.36 | |
| OXB | Oxford Biomedica Plc | 659.0 | 637.0 | 638.0 | 127.0K | -21.0 | | 3.19 | |
| OXH | Oxford Technology 2 Venture Capital | 7.000 | 7.000 | 7.000 | 0 | 0.000 | | 0.00 | |
| OXIG | Oxford Instruments Plc | 2,800 | 2,635 | 2,635 | 181.9K | -40 | | 1.50 | |
| OZ76 | Nationwide Building Society | 98.25 | 98.25 | 98.25 | 578.0K | 0.00 | | 0.00 | |