| OAP3 | Octopus Apollo Vct PLC | 45.20 | 45.00 | 46.70 | 120.6K | 0.00 | | 0.00 | |
| OAUE | UBS Etf | 125.6 | 125.6 | 125.6 | 17 | 0.0 | | 0.00 | |
| OBD | Oxford Biodynamics PLC | 0.2100 | 0.1900 | 0.1900 | 20.73M | 0.0000 | | 0.00 | |
| OBI | Ondine Biomedical Inc. | 11.00 | 10.10 | 10.50 | 1.1K | 0.00 | | 0.00 | |
| OCDO | Ocado Group PLC | 183.6 | 176.9 | 182.0 | 2.52M | 0.0 | | 0.00 | |
| OCI | Oakley Capital Investments Limited | 482.0 | 469.5 | 474.0 | 177.0K | 0.0 | | 0.00 | |
| OCTF | First Trust Global Funds Public Limited | 2,008 | 2,005 | 2,021 | 300 | 9 | | 0.44 | |
| OE08 | Bank Of Montreal | 100.4 | 100.4 | 100.4 | 1.0M | 0.0 | | 0.00 | |
| OE61 | The Kingdom Of Morocco | 105.7 | 105.7 | 105.7 | 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 | 8.200 | 8.200 | 8.200 | 120 | 0.000 | | 0.00 | |
| OGG9 | Gold Bullion Securities LD | 366.2 | 366.2 | 366.2 | 3 | 7.9 | | 2.21 | |
| OGLD | Deutsche Boerse Commodities Gmbh | 128.8 | 128.8 | 128.8 | 2.0K | -2.5 | | 1.92 | |
| OGN | Origin Enterprises PLC | 370.5 | 370.5 | 377.5 | 536 | 0.0 | | 0.00 | |
| OGOL | Global X Metal Securities | 56.35 | 56.35 | 56.35 | 68 | -5.70 | | 9.19 | |
| OGZU | Wisdomtree Metal Securities Limited | 386.7 | 381.7 | 386.7 | 3 | 5.6 | | 1.47 | |
| OHGR | One Health Group PLC | 238.2 | 236.0 | 243.0 | 14.8K | 1.0 | | 0.41 | |
| OI20 | Kingdom Of Saudi Arabia (The) | 101.5 | 101.5 | 101.5 | 0 | 0.0 | | 0.00 | |
| OIG | Oryx International Growth Fund LTD | 1,240 | 1,180 | 1,200 | 640 | 0 | | 0.00 | |
| OIGB | Vaneck Ucits Etfs PLC | 25.27 | 24.68 | 24.92 | 23.3K | 0.00 | | 0.00 | |
| OIH | Orascom Investment Holding S.A.E | 0.0150 | 0.0140 | 0.0140 | 1.8K | 0.0000 | | 0.00 | |
| OIHV | Vaneck Ucits Etfs PLC | 33.51 | 32.84 | 33.02 | 59.1K | 0.00 | | 0.00 | |
| OIL2 | Wisdomtree Commodity Securities Limited | 1,900 | 1,748 | 1,776 | 22.1K | 0 | | 0.00 | |
| OIL3 | UBS AG | 112.2 | 109.7 | 132.1 | 128 | 0.0 | | 0.00 | |
| OILG | UBS AG | 7,466 | 7,466 | 10,408 | 0 | 0 | | 0.00 | |
| OILU | UBS AG | 166.7 | 166.7 | 164.0 | 2 | 0.5 | | 0.27 | |
| OIP9 | Shell International Finance B.V | 97.08 | 97.08 | 97.08 | 0 | 0.00 | | 0.00 | |
| OIT | Odyssean Investment Trust PLC | 176.5 | 171.4 | 174.0 | 104.5K | 0.0 | | 0.00 | |
| OM9S | Yorkshire Water Finance PLC | 77.40 | 77.40 | 77.40 | 0 | 0.00 | | 0.00 | |
| OMG | Oxford Metrics PLC | 45.70 | 43.10 | 44.35 | 168.7K | 0.00 | | 0.00 | |
| OMI | Orosur Mining INC | 19.00 | 18.00 | 18.50 | 1.39M | -1.00 | | 6.06 | |
| OMIP | One Media Ip Group PLC | 3.240 | 3.240 | 3.200 | 106.0K | 0.000 | | 0.00 | |
| OMU | Old Mutual Limited | 64.40 | 60.80 | 64.40 | 106.0K | 0.00 | | 0.00 | |
| OMXS | Ishares Iv PLC | 797.3 | 780.5 | 789.5 | 9.3K | 0.0 | | 0.00 | |
| ONDO | Ondo Insurtech PLC | 14.50 | 14.26 | 14.50 | 195.9K | 0.00 | | 0.00 | |
| ONT | Oxford Nanopore Technologies PLC | 119.9 | 110.9 | 119.9 | 1.33M | 0.0 | | 0.00 | |
| ONWD | Onward Opportunities Limited | 123.0 | 121.2 | 122.5 | 19.4K | 0.0 | | 0.00 | |
| OOA | Octopus Aim Vct PLC | 35.00 | 35.00 | 37.20 | 27.9K | 0.00 | | 0.00 | |
| OPEN | Ishares Iv PLC | 9.944 | 9.944 | 9.923 | 17 | -0.082 | | 0.85 | |
| OPT | Optima Health PLC | 183.0 | 180.0 | 181.5 | 42.5K | 0.0 | | 0.00 | |
| OPTI | Optibiotix Health PLC | 5.400 | 5.000 | 5.200 | 1.27M | 0.000 | | 0.00 | |
| OQ12 | Standard Chartered PLC | 91.00 | 91.00 | 91.00 | 0 | 0.00 | | 0.00 | |
| ORC1 | Orchard Bond Finance PLC | 102.3 | 102.3 | 100.8 | 0 | 2.2 | | 2.21 | |
| ORCA | Orcadian Energy PLC | 15.00 | 13.00 | 14.00 | 44.6K | 0.00 | | 0.00 | |
| ORCH | Orchard Funding Group PLC | 55.00 | 53.88 | 54.50 | 27.6K | -1.00 | | 1.79 | |
| ORCP | Oracle Power PLC | 0.0500 | 0.0450 | 0.0475 | 66.8M | -0.0005 | | 1.04 | |
| ORIT | Octopus Renewables Infrastructure Trust | 56.02 | 53.00 | 53.00 | 1.3M | 0.00 | | 0.00 | |
| ORNT | Orient Telecoms PLC | 3.200 | 3.200 | 4.000 | 5.0K | 0.000 | | 0.00 | |
| ORR | Oriole Resources PLC | 0.3000 | 0.2700 | 0.2750 | 14.43M | 0.0000 | | 0.00 | |
| OS73 | Toyota Finance Australia Limited | 95.17 | 95.17 | 95.17 | 0 | 0.00 | | 0.00 | |
| OSB | Osb Group PLC | 517.5 | 503.5 | 513.0 | 3.91M | 0.0 | | 0.00 | |
| OSEC | Octopus Aim Vct 2 PLC | 28.00 | 28.00 | 29.60 | 36.7K | 0.00 | | 0.00 | |
| OSX5 | Source Markets Public Limited Company | 53.29 | 53.29 | 53.29 | 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 | 16.00 | 16.00 | 14.50 | 10.0K | 0.00 | | 0.00 | |
| OT3 | Oxford Technology 2 Venture Capital | 5.500 | 5.500 | 7.500 | 33.0K | 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 | 167.0 | 159.6 | 164.6 | 487.5K | 0.0 | | 0.00 | |
| OTES | Hellenic Telecommunications Organization | 10.14 | 10.05 | 10.14 | 2 | 0.00 | | 0.00 | |
| OTPD | Otp Bank PLC | 17.00 | 17.00 | 17.00 | 1 | 0.00 | | 0.00 | |
| OTV2 | Octopus Titan Vct PLC | 21.00 | 12.00 | 20.50 | 43.3K | 0.00 | | 0.00 | |
| OVCT | Oberon Aim Vct PLC | 22.00 | 22.00 | 23.50 | 1.0K | 0.00 | | 0.00 | |
| OVZA | Wisdomtree Metal Securities Limited | 158.0 | 150.0 | 156.4 | 24 | 6.0 | | 3.97 | |
| OVZB | Wisdomtree Metal Securities Limited | 119.5 | 114.4 | 118.7 | 18 | 0.0 | | 0.00 | |
| OVZC | Wisdomtree Metal Securities Limited | 57.52 | 55.08 | 56.95 | 5.9K | 0.88 | | 1.56 | |
| OXA1 | Db Etc PLC | 262.9 | 261.7 | 262.9 | 130 | 0.2 | | 0.06 | |
| OXA2 | Db Etc PLC | 390.1 | 385.5 | 390.1 | 217 | 0.0 | | 0.00 | |
| OXA5 | Db Etc PLC | 393.1 | 393.1 | 393.1 | 11 | 10.5 | | 2.75 | |
| OXA6 | Db Etc PLC | 562.0 | 545.4 | 547.9 | 62 | -37.3 | | 6.37 | |
| OXB | Oxford Biomedica PLC | 563.0 | 542.0 | 560.0 | 196.5K | 0.0 | | 0.00 | |
| OXH | Oxford Technology 2 Venture Capital | 8.000 | 8.000 | 7.000 | 20.0K | 0.000 | | 0.00 | |
| OXIG | Oxford Instruments PLC | 2,500 | 2,420 | 2,500 | 134.3K | 0 | | 0.00 | |
| OZ76 | Nationwide Building Society | 98.25 | 98.25 | 98.25 | 578.0K | 0.00 | | 0.00 | |