| OAP3 | Octopus Apollo Vct PLC | 46.20 | 46.20 | 46.20 | 7.1K | 0.00 | | 0.00 | |
| OAUE | UBS Etf | 42.76 | 42.76 | 42.76 | 19 | 0.00 | | 0.00 | |
| OBD | Oxford Biodynamics PLC | 0.2500 | 0.2300 | 0.2300 | 13.09M | -0.0128 | | 5.27 | |
| OBI | Ondine Biomedical Inc. | 11.00 | 10.50 | 10.60 | 791.2K | -0.90 | | 7.83 | |
| OCDO | Ocado Group PLC | 207.5 | 194.5 | 199.6 | 1.81M | -6.7 | | 3.25 | |
| OCI | Oakley Capital Investments Limited | 502.0 | 472.0 | 479.0 | 512.1K | -13.0 | | 2.64 | |
| OCTF | First Trust Global Funds Public Limited | 2,026 | 2,026 | 2,022 | 150 | 0 | | 0.01 | |
| 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 LD | 376.9 | 376.9 | 376.9 | 0 | -20.7 | | 5.20 | |
| OGLD | Deutsche Boerse Commodities Gmbh | 132.9 | 126.1 | 128.3 | 13.3K | -8.0 | | 5.83 | |
| OGN | Origin Enterprises PLC | 384.1 | 384.1 | 384.1 | 52 | 0.0 | | 0.00 | |
| OGOL | Global X Metal Securities | 56.35 | 56.35 | 56.35 | 6 | 0.00 | | 0.00 | |
| OGZU | Wisdomtree Metal Securities Limited | 394.8 | 379.0 | 382.0 | 49 | -23.0 | | 5.67 | |
| OHGR | One Health Group PLC | 240.0 | 236.0 | 237.6 | 7.0K | 1.6 | | 0.68 | |
| OI20 | Kingdom Of Saudi Arabia (The) | 104.3 | 104.3 | 104.3 | 0 | 0.0 | | 0.00 | |
| OIG | Oryx International Growth Fund LTD | 1,220 | 1,185 | 1,185 | 7.9K | -42 | | 3.38 | |
| OIGB | Vaneck Ucits Etfs PLC | 24.39 | 23.71 | 24.27 | 44.0K | 0.41 | | 1.72 | |
| OIH | Orascom Investment Holding S.A.E | 0.0150 | 0.0140 | 0.0140 | 1.8K | 0.0000 | | 0.00 | |
| OIHV | Vaneck Ucits Etfs PLC | 32.61 | 31.18 | 32.50 | 49.3K | 0.58 | | 1.80 | |
| OIL2 | Wisdomtree Commodity Securities Limited | 1,852 | 1,683 | 1,785 | 32.1K | 38 | | 2.15 | |
| OIL3 | UBS AG | 112.2 | 109.7 | 132.2 | 128 | 0.0 | | 0.00 | |
| OILG | UBS AG | 7,466 | 7,466 | 10,408 | 0 | 0 | | 0.00 | |
| OILU | UBS AG | 178.7 | 178.7 | 178.7 | 6 | 8.2 | | 4.79 | |
| OIP9 | Shell International Finance B.V | 97.70 | 97.70 | 97.70 | 0 | 0.00 | | 0.00 | |
| OIT | Odyssean Investment Trust PLC | 185.5 | 178.0 | 179.0 | 342.9K | -5.5 | | 2.98 | |
| OM9S | Yorkshire Water Finance PLC | 78.59 | 78.59 | 78.59 | 0 | 0.00 | | 0.00 | |
| OMG | Oxford Metrics PLC | 47.00 | 44.00 | 45.50 | 224.8K | 0.00 | | 0.00 | |
| OMI | Orosur Mining INC | 18.00 | 18.00 | 18.00 | 5.5M | -1.54 | | 7.69 | |
| OMIP | One Media Ip Group PLC | 3.210 | 3.200 | 3.200 | 5.8K | -0.276 | | 8.63 | |
| OMU | Old Mutual Limited | 62.00 | 60.00 | 61.00 | 155.5K | 0.20 | | 0.33 | |
| OMXS | Ishares Iv PLC | 781.8 | 760.3 | 760.3 | 16.3K | -29.8 | | 3.77 | |
| ONDO | Ondo Insurtech PLC | 15.15 | 14.60 | 14.60 | 1.38M | -0.75 | | 4.76 | |
| ONT | Oxford Nanopore Technologies PLC | 126.9 | 119.7 | 119.8 | 756.0K | -2.9 | | 2.36 | |
| ONWD | Onward Opportunities Limited | 130.4 | 128.0 | 128.0 | 16.5K | -0.8 | | 0.59 | |
| OOA | Octopus Aim Vct PLC | 38.70 | 38.70 | 38.70 | 101.9K | 0.00 | | 0.00 | |
| OPEN | Ishares Iv PLC | 9.862 | 9.862 | 9.862 | 10.0K | -0.230 | | 2.28 | |
| OPT | Optima Health PLC | 183.0 | 180.0 | 182.0 | 126.4K | 0.5 | | 0.28 | |
| OPTI | Optibiotix Health PLC | 6.375 | 5.780 | 6.200 | 408.7K | -0.052 | | 0.83 | |
| OQ12 | Standard Chartered PLC | 91.00 | 91.00 | 91.00 | 0 | -1.54 | | 1.66 | |
| ORC1 | Orchard Bond Finance PLC | 103.0 | 103.0 | 100.5 | 0 | 2.2 | | 2.21 | |
| ORCA | Orcadian Energy PLC | 15.50 | 14.50 | 14.85 | 310.9K | 0.35 | | 2.41 | |
| ORCH | Orchard Funding Group PLC | 60.00 | 57.00 | 58.00 | 17.2K | -0.02 | | 0.03 | |
| ORCP | Oracle Power PLC | 0.0430 | 0.0400 | 0.0430 | 219.96M | -0.0050 | | 10.42 | |
| ORIT | Octopus Renewables Infrastructure Trust | 59.00 | 57.50 | 58.00 | 1.24M | 0.10 | | 0.17 | |
| ORNT | Orient Telecoms PLC | 3.200 | 3.200 | 4.000 | 5.0K | 0.000 | | 0.00 | |
| ORR | Oriole Resources PLC | 0.3000 | 0.3000 | 0.3000 | 14.82M | -0.0145 | | 4.53 | |
| OS73 | Toyota Finance Australia Limited | 96.04 | 96.04 | 96.04 | 0 | 0.00 | | 0.00 | |
| OSB | Osb Group PLC | 565.5 | 540.0 | 542.5 | 1.35M | -24.7 | | 4.36 | |
| OSEC | Octopus Aim Vct 2 PLC | 30.80 | 30.80 | 30.80 | 48.5K | -0.40 | | 1.28 | |
| OSX5 | Source Markets Public Limited Company | 54.48 | 54.48 | 54.48 | 0 | -1.92 | | 3.40 | |
| 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 | 166.2 | 159.9 | 161.6 | 901.4K | -5.4 | | 3.23 | |
| OTES | Hellenic Telecommunications Organization | 9.590 | 9.540 | 9.590 | 2 | -0.700 | | 6.80 | |
| OTPD | Otp Bank PLC | 17.00 | 17.00 | 17.00 | 1 | 0.00 | | 0.00 | |
| OTV2 | Octopus Titan Vct PLC | 21.00 | 21.00 | 21.00 | 25.0K | 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 | 24.60 | 24.60 | 25.70 | 16.0K | 0.00 | | 0.00 | |
| OVZA | Wisdomtree Metal Securities Limited | 155.7 | 148.8 | 153.8 | 111 | -8.9 | | 5.45 | |
| OVZB | Wisdomtree Metal Securities Limited | 116.7 | 112.3 | 114.6 | 128 | -5.0 | | 4.19 | |
| OVZC | Wisdomtree Metal Securities Limited | 57.15 | 52.10 | 55.66 | 12.4K | -5.55 | | 9.07 | |
| OXA1 | Db Etc PLC | 269.6 | 258.0 | 262.0 | 678 | -15.7 | | 5.64 | |
| OXA2 | Db Etc PLC | 372.8 | 348.5 | 366.8 | 44 | -35.3 | | 8.78 | |
| OXA5 | Db Etc PLC | 396.4 | 379.5 | 382.7 | 190 | -23.4 | | 5.76 | |
| OXA6 | Db Etc PLC | 586.5 | 540.7 | 574.1 | 212 | -54.1 | | 8.61 | |
| OXB | Oxford Biomedica PLC | 640.0 | 618.0 | 618.0 | 246.8K | -26.0 | | 4.04 | |
| OXH | Oxford Technology 2 Venture Capital | 8.000 | 8.000 | 7.000 | 20.0K | 0.000 | | 0.00 | |
| OXIG | Oxford Instruments PLC | 2,505 | 2,390 | 2,405 | 208.0K | -130 | | 5.13 | |
| OZ76 | Nationwide Building Society | 98.25 | 98.25 | 98.25 | 578.0K | 0.00 | | 0.00 | |