| OAP3 | Octopus Apollo Vct PLC | 46.60 | 46.60 | 46.70 | 20 | 0.00 | | 0.00 | |
| OAUE | UBS Etf | 125.6 | 125.6 | 125.6 | 396 | 3.3 | | 2.68 | |
| OBD | Oxford Biodynamics Plc | 0.2100 | 0.1900 | 0.2100 | 21.59M | 0.0100 | | 5.00 | |
| OBI | Ondine Biomedical Inc | 11.00 | 10.50 | 11.00 | 533.0K | 0.25 | | 2.33 | |
| OCDO | Ocado Group Plc | 189.5 | 181.6 | 185.8 | 1.65M | -2.2 | | 1.17 | |
| OCI | Oakley Capital Investments Limited | 469.0 | 457.0 | 457.0 | 832.2K | -10.0 | | 2.14 | |
| OCTF | First Trust Global Funds Public Limited | 2,008 | 2,005 | 1,988 | 300 | -15 | | 0.77 | |
| OE08 | Bank Of Montreal | 100.4 | 100.4 | 100.4 | 1.0M | 0.0 | | 0.00 | |
| OE61 | The Kingdom Of Morocco | 106.7 | 106.7 | 106.7 | 0 | 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 | 120 | 0.000 | | 0.00 | |
| OGG9 | Gold Bullion Securities | 353.1 | 351.9 | 351.9 | 100 | -58.1 | | 14.18 | |
| OGLD | Deutsche Boerse Commodities Gmbh | 123.3 | 123.3 | 123.3 | 650 | 0.6 | | 0.52 | |
| OGN | Origin Enterprises PLC | 384.1 | 384.1 | 370.0 | 1.0K | -366.3 | | 9900.00 | |
| OGOL | Global X Metal Securities | 56.35 | 56.35 | 56.35 | 33 | 0.00 | | 0.00 | |
| OGZU | Wisdomtree Metal Securities Limited | 376.1 | 367.3 | 376.1 | 100 | -49.3 | | 11.58 | |
| OHGR | One Health Group Plc | 243.1 | 243.1 | 243.1 | 100 | 0.1 | | 0.06 | |
| OI20 | Kingdom Of Saudi Arabia (The) | 101.5 | 101.5 | 101.5 | 0 | 0.0 | | 0.00 | |
| OIG | Oryx International Growth Fund Ltd | 1,220 | 1,169 | 1,220 | 1.2K | 33 | | 2.74 | |
| OIGB | Vaneck Oil Services Ucits ETF | 25.80 | 25.39 | 25.77 | 75.8K | 0.30 | | 1.18 | |
| 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 | 34.50 | 33.62 | 34.23 | 271.8K | 0.26 | | 0.75 | |
| OIL2 | Wisdomtree WTI Crude Oil 2X Daily Lev | 1,727 | 1,651 | 1,725 | 66.3K | 77 | | 4.69 | |
| OIL3 | UBS AG | 112.2 | 109.7 | 130.3 | 128 | 5.8 | | 4.26 | |
| OILG | UBS AG | 7,466 | 7,466 | 10,408 | 0 | 0 | | 0.00 | |
| OILU | UBS AG | 164.9 | 161.3 | 174.2 | 315 | 6.0 | | 3.39 | |
| OIP9 | Shell International Finance B.V | 97.08 | 97.08 | 97.08 | 0 | 0.00 | | 0.00 | |
| OIT | Odyssean Investment Trust Plc | 177.0 | 173.0 | 173.0 | 112.4K | -3.0 | | 1.70 | |
| OM9S | Yorkshire Water Finance PLC | 77.48 | 77.48 | 77.48 | 0 | 0.00 | | 0.00 | |
| OMG | Oxford Metrics Plc | 44.90 | 43.00 | 43.00 | 227.5K | 0.00 | | 0.00 | |
| OMI | Orosur Mining Inc | 18.00 | 16.50 | 16.50 | 2.06M | -0.50 | | 2.94 | |
| OMIP | One Media Ip Group PLC | 3.180 | 3.180 | 3.180 | 31.3K | 0.000 | | 0.00 | |
| OMU | Old Mutual Limited | 60.80 | 59.40 | 60.80 | 67.2K | -1.00 | | 1.62 | |
| OMXS | Ishares Omx Stockholm Capped Ucits ETF | 763.3 | 751.6 | 756.3 | 50.2K | -5.3 | | 0.69 | |
| ONDO | Ondo Insurtech Plc | 14.75 | 14.65 | 14.65 | 164.4K | -0.10 | | 0.68 | |
| ONT | Oxford Nanopore Technologies Plc | 120.0 | 111.6 | 113.6 | 1.91M | -4.3 | | 3.65 | |
| ONWD | Onward Opportunities Limited | 125.0 | 123.5 | 125.0 | 12.7K | 1.5 | | 1.21 | |
| OOA | Octopus Aim Vct PLC | 38.70 | 38.70 | 37.80 | 101.9K | 0.00 | | 0.00 | |
| OPEN | Ish Re Incl / Diversity ETF | 9.690 | 9.651 | 9.690 | 13.3K | -0.095 | | 0.97 | |
| OPT | Optima Health Plc | 182.0 | 178.0 | 180.0 | 73.5K | 0.0 | | 0.00 | |
| OPTI | Optibiotix Health Plc | 5.500 | 5.066 | 5.500 | 210.6K | 0.250 | | 4.76 | |
| OQ12 | Standard Chartered PLC | 91.00 | 91.00 | 91.00 | 0 | 0.00 | | 0.00 | |
| ORC1 | Orchard Bond Finance PLC | 103.0 | 103.0 | 100.5 | 0 | 2.2 | | 2.21 | |
| ORCA | Orcadian Energy Plc | 13.75 | 13.16 | 13.75 | 59.3K | 0.25 | | 1.85 | |
| ORCH | Orchard Funding Group Plc | 56.00 | 53.00 | 55.99 | 54.6K | -0.51 | | 0.90 | |
| ORCP | Oracle Power Plc | 0.0450 | 0.0400 | 0.0430 | 50.65M | -0.0010 | | 2.27 | |
| ORIT | Octopus Renewables Infrastructure Trust | 57.70 | 55.30 | 55.50 | 686.7K | -1.50 | | 2.63 | |
| ORNT | Orient Telecoms PLC | 3.200 | 3.200 | 4.000 | 5.0K | 0.000 | | 0.00 | |
| ORR | Oriole Resources Plc | 0.3000 | 0.2700 | 0.2910 | 20.18M | 0.0010 | | 0.34 | |
| OS73 | Toyota Finance Australia Limited | 96.04 | 96.04 | 96.04 | 0 | 0.00 | | 0.00 | |
| OSB | Osb Group Plc | 531.0 | 494.0 | 494.0 | 837.9K | -33.0 | | 6.27 | |
| OSEC | Octopus Aim Vct 2 PLC | 30.80 | 30.80 | 30.00 | 48.5K | 0.00 | | 0.00 | |
| OSX5 | Source Markets Public Limited Company | 54.11 | 54.11 | 54.11 | 91 | 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 | 16.00 | 16.00 | 14.50 | 10.0K | 0.00 | | 0.00 | |
| OT3 | Oxford Technology 2 Venture Capital | 8.500 | 8.500 | 7.500 | 10.0K | 0.000 | | 0.00 | |
| OT4 | Oxford Technology 2 Venture Capital | 8.500 | 8.500 | 7.500 | 10.0K | 0.000 | | 0.00 | |
| OTB | On The Beach Group Plc | 167.4 | 159.4 | 161.0 | 406.5K | -2.4 | | 1.47 | |
| OTES | Hellenic Telecommunications Organization | 9.620 | 9.550 | 9.550 | 100 | 0.000 | | 0.00 | |
| OTPD | Otp Bank PLC | 17.00 | 17.00 | 17.00 | 1 | 0.00 | | 0.00 | |
| OTV2 | Octopus Titan Vct Plc | 21.40 | 20.50 | 21.40 | 9.0K | 0.90 | | 4.39 | |
| OVCT | Oberon Aim Vct PLC | 24.60 | 24.60 | 25.70 | 16.0K | 0.00 | | 0.00 | |
| OVZA | Wisdomtree Metal Securities Limited | 149.8 | 144.0 | 149.4 | 100 | 2.0 | | 1.34 | |
| OVZB | Wisdomtree Metal Securities Limited | 111.3 | 108.5 | 111.3 | 0 | 4.1 | | 3.82 | |
| OVZC | Wisdomtree Metal Securities Limited | 56.35 | 53.60 | 55.93 | 3.0K | 1.05 | | 1.91 | |
| OXA1 | Physical Gold Euro Hdg Etc | 253.9 | 252.1 | 253.9 | 366 | 4.0 | | 1.59 | |
| OXA2 | Db Etc PLC | 359.4 | 349.4 | 351.0 | 20 | 0.0 | | 0.00 | |
| OXA5 | Db Etc PLC | 370.7 | 365.4 | 365.4 | 9 | 0.5 | | 0.14 | |
| OXA6 | Db Etc PLC | 562.0 | 545.4 | 547.9 | 62 | -157.1 | | 22.28 | |
| OXB | Oxford Biomedica Plc | 570.0 | 558.6 | 561.0 | 329.9K | -14.0 | | 2.43 | |
| OXH | Oxford Technology 2 Venture Capital | 8.000 | 8.000 | 7.000 | 20.0K | 0.000 | | 0.00 | |
| OXIG | Oxford Instruments Plc | 2,510 | 2,370 | 2,395 | 215.8K | -90 | | 3.62 | |
| OZ76 | Nationwide Building Society | 98.25 | 98.25 | 98.25 | 578.0K | 0.00 | | 0.00 | |