| OAP3 | Octopus Apollo Vct Plc | 46.40 | 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 | 0.2450 | 3.09M | -0.0050 | | 2.00 | |
| OBI | Ondine Biomedical Inc | 11.40 | 10.50 | 11.00 | 24.9K | 0.00 | | 0.00 | |
| OCDO | Ocado Group Plc | 207.2 | 198.5 | 202.0 | 1.67M | 0.6 | | 0.30 | |
| OCI | Oakley Capital Investments Limited | 516.0 | 492.0 | 492.0 | 240.3K | -14.0 | | 2.77 | |
| OCTF | First Trust Global Funds Public Limited | 2,020 | 2,020 | 2,020 | 0 | -5 | | 0.25 | |
| OE08 | Bank Of Montreal | 100.4 | 100.4 | 100.4 | 1.0M | 0.0 | | 0.00 | |
| OE61 | The Kingdom Of Morocco | 107.9 | 107.9 | 107.9 | 1.32M | 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 | 409.1 | 406.8 | 406.8 | 0 | 3.0 | | 0.74 | |
| OGLD | Deutsche Boerse Commodities Gmbh | 144.5 | 142.7 | 144.4 | 1.4K | 0.7 | | 0.49 | |
| OGN | Origin Enterprises Plc | 370.0 | 370.0 | 370.0 | 0 | 0.0 | | 0.00 | |
| OGOL | Global X Metal Securities | 66.29 | 66.29 | 66.29 | 100 | -0.57 | | 0.85 | |
| OGZU | Wisdomtree Metal Securities Limited | 429.4 | 425.9 | 427.9 | 0 | 0.2 | | 0.05 | |
| OHGR | One Health Group Plc | 247.9 | 243.0 | 243.0 | 3.4K | 0.0 | | 0.00 | |
| OI20 | Kingdom Of Saudi Arabia (The) | 104.3 | 104.3 | 104.3 | 0 | 0.6 | | 0.54 | |
| OIG | Oryx International Growth Fund Ltd | 1,295 | 1,216 | 1,268 | 15.0K | 3 | | 0.20 | |
| OIGB | Vaneck Oil Services Ucits ETF | 23.56 | 22.74 | 22.99 | 35.6K | -0.51 | | 2.15 | |
| 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 | 31.55 | 30.39 | 30.63 | 20.8K | -0.69 | | 2.19 | |
| OIL2 | Wisdomtree WTI Crude Oil 2X Daily Lev | 1,643 | 1,494 | 1,597 | 21.4K | 220 | | 15.98 | |
| OIL3 | UBS Etc [Cmci WTI 3M] USD | 126.2 | 126.2 | 126.2 | 0 | 8.2 | | 6.90 | |
| OILG | UBS Etc [Cmci Wti] GBP | 10,185 | 10,185 | 10,185 | 0 | 507 | | 5.24 | |
| OILU | UBS Etc [Ubs BBG CMCI WTI Crude Idx] USD | 166.7 | 166.7 | 166.7 | 0 | 8.1 | | 5.12 | |
| OIP9 | Shell International Finance B.V | 97.70 | 97.70 | 97.70 | 0 | 0.00 | | 0.00 | |
| OIT | Odyssean Investment Trust Plc | 189.0 | 182.7 | 184.3 | 198.6K | -4.5 | | 2.38 | |
| OM9S | Yorkshire Water Finance PLC | 69.60 | 69.60 | 69.60 | 100.0K | 0.00 | | 0.00 | |
| OMG | Oxford Metrics Plc | 50.60 | 47.35 | 47.80 | 336.9K | -2.20 | | 4.40 | |
| OMI | Orosur Mining Inc | 21.60 | 19.99 | 20.50 | 1.71M | -1.00 | | 4.65 | |
| OMIP | One Media Ip Group Plc | 3.800 | 3.500 | 3.500 | 6.0K | 0.000 | | 0.00 | |
| OMU | Old Mutual Limited | 67.49 | 66.00 | 66.20 | 101.2K | -1.20 | | 1.78 | |
| OMXS | Ishares Omx Stockholm Capped Ucits ETF | 811.8 | 799.5 | 804.0 | 15.6K | -5.4 | | 0.66 | |
| ONDO | Ondo Insurtech Plc | 16.00 | 15.50 | 15.60 | 712.2K | -0.40 | | 2.50 | |
| ONT | Oxford Nanopore Technologies Plc | 121.3 | 116.1 | 118.2 | 779.8K | -2.7 | | 2.23 | |
| ONWD | Onward Opportunities Limited | 137.0 | 135.0 | 137.0 | 24.2K | 0.0 | | 0.00 | |
| OOA | Octopus Aim Vct Plc | 40.00 | 40.00 | 40.00 | 0 | -4.00 | | 9.09 | |
| OPEN | Ish Re Incl / Diversity ETF | 9.953 | 9.912 | 9.912 | 0 | -0.132 | | 1.31 | |
| OPT | Optima Health Plc | 185.0 | 182.0 | 183.0 | 167.3K | 0.5 | | 0.27 | |
| OPTI | Optibiotix Health Plc | 6.500 | 6.000 | 6.250 | 170.3K | 0.000 | | 0.00 | |
| OQ12 | Standard Chartered PLC | 92.40 | 92.40 | 92.54 | 0 | 0.00 | | 0.00 | |
| ORC1 | Orchard Bond Finance PLC | 103.0 | 103.0 | 103.0 | 0 | 2.2 | | 2.21 | |
| ORCA | Orcadian Energy Plc | 16.95 | 16.50 | 16.50 | 5.0K | 0.00 | | 0.00 | |
| ORCH | Orchard Funding Group Plc | 60.00 | 57.50 | 59.00 | 39.0K | -0.50 | | 0.84 | |
| ORCP | Oracle Power Plc | 0.0550 | 0.0470 | 0.0490 | 108.02M | -0.0040 | | 7.55 | |
| ORIT | Octopus Renewables Infrastructure Trust | 57.60 | 56.10 | 56.90 | 953.0K | -0.10 | | 0.18 | |
| ORNT | Orient Telecoms Plc | 4.000 | 4.000 | 4.000 | 0 | 0.000 | | 0.00 | |
| ORR | Oriole Resources Plc | 0.3300 | 0.3000 | 0.3150 | 2.96M | -0.0050 | | 1.56 | |
| OS73 | Toyota Finance Australia Limited | 96.04 | 96.04 | 96.04 | 0 | 0.00 | | 0.00 | |
| OSB | Osb Group Plc | 575.5 | 564.5 | 567.0 | 800.6K | -7.0 | | 1.22 | |
| OSEC | Octopus Aim Vct 2 Plc | 31.80 | 31.80 | 31.80 | 0 | -4.20 | | 11.67 | |
| OSX5 | Source Markets Public Limited Company | 54.48 | 54.07 | 54.48 | 3 | 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 | 12.00 | 14.50 | 10.0K | 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 | 177.4 | 164.8 | 167.0 | 2.52M | -26.0 | | 13.47 | |
| 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 | 21.50 | 15.00 | 21.50 | 5.4K | 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 | 174.0 | 169.5 | 174.0 | 100 | 1.8 | | 1.02 | |
| OVZB | Wisdomtree Metal Securities Limited | 132.0 | 128.1 | 129.3 | 100 | 0.5 | | 0.42 | |
| OVZC | Wisdomtree Metal Securities Limited | 69.59 | 66.99 | 69.59 | 2.5K | 3.16 | | 4.75 | |
| OXA1 | Physical Gold Euro Hdg Etc | 295.3 | 291.7 | 291.7 | 505 | -2.5 | | 0.85 | |
| OXA2 | Physical Silver Euro Hdg Etc | 464.3 | 442.2 | 464.3 | 100 | 22.2 | | 5.01 | |
| OXA5 | Physical Gold Etc 27/08/60 | 430.8 | 426.6 | 426.6 | 100 | -1.6 | | 0.36 | |
| OXA6 | Physical Silver Etc 27/08/60 | 715.8 | 688.9 | 715.8 | 137 | 36.4 | | 5.35 | |
| OXB | Oxford Biomedica Plc | 655.2 | 625.0 | 631.0 | 162.3K | -6.0 | | 0.94 | |
| OXH | Oxford Technology 2 Venture Capital | 7.000 | 7.000 | 7.000 | 0 | 0.000 | | 0.00 | |
| OXIG | Oxford Instruments Plc | 2,615 | 2,560 | 2,570 | 338.4K | -10 | | 0.39 | |
| OZ76 | Nationwide Building Society | 98.25 | 98.25 | 98.25 | 578.0K | 0.00 | | 0.00 | |