| OAP3 | Octopus Apollo Vct PLC | 49.00 | 46.00 | 47.50 | 11.0K | 0.00 | | 0.00 | |
| OAUE | UBS Etf | 42.76 | 42.76 | 42.76 | 73 | 0.00 | | 0.00 | |
| OBD | Oxford Biodynamics PLC | 0.3100 | 0.3000 | 0.3050 | 31.38M | 0.0000 | | 0.00 | |
| OBI | Ondine Biomedical Inc. | 12.25 | 12.06 | 12.06 | 2.0K | -0.19 | | 1.55 | |
| OCDO | Ocado Group PLC | 200.9 | 189.3 | 197.0 | 4.7M | -2.2 | | 1.10 | |
| OCI | Oakley Capital Investments Limited | 545.0 | 530.0 | 536.0 | 680.1K | -6.0 | | 1.11 | |
| OCN | Ocean Wilsons (Holdings) LD | 1,135 | 1,125 | 1,129 | 21.7K | 4 | | 0.34 | |
| OCTF | First Trust Global Funds Public Limited | 2,026 | 2,026 | 2,024 | 150 | -27 | | 1.31 | |
| OE08 | Bank Of Montreal | 100.4 | 100.4 | 100.4 | 1.0M | 0.0 | | 0.00 | |
| OE61 | The Kingdom Of Morocco | 110.4 | 110.4 | 110.4 | 1.2M | 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 | 8.000 | 8.000 | 8.000 | 6.0K | 0.000 | | 0.00 | |
| OGG9 | Gold Bullion Securities LD | 313.1 | 313.1 | 313.1 | 1.9K | 0.0 | | 0.00 | |
| OGLD | Deutsche Boerse Commodities Gmbh | 111.9 | 110.7 | 111.2 | 2.1K | 0.2 | | 0.15 | |
| OGN | Origin Enterprises PLC | 3.730 | 3.650 | 3.650 | 107.6K | -0.080 | | 2.14 | |
| OGOL | Global X Metal Securities | 56.35 | 56.35 | 56.35 | 1.0K | 0.00 | | 0.00 | |
| OGZU | Wisdomtree Metal Securities Limited | 332.6 | 329.4 | 329.4 | 0 | -1.6 | | 0.48 | |
| OHGR | One Health Group PLC | 240.0 | 234.0 | 234.0 | 6.3K | -5.0 | | 2.09 | |
| OI20 | Kingdom Of Saudi Arabia (The) | 105.9 | 105.9 | 105.9 | 1.16M | 0.0 | | 0.00 | |
| OIG | Oryx International Growth Fund LTD | 1,278 | 1,255 | 1,270 | 13.8K | -20 | | 1.53 | |
| OIGB | Vaneck Ucits Etfs PLC | 17.50 | 16.96 | 16.96 | 1.1K | -0.34 | | 1.98 | |
| OIH | Orascom Investment Holding S.A.E | 0.0150 | 0.0140 | 0.0140 | 1.8K | 0.0000 | | 0.00 | |
| OIHV | Vaneck Ucits Etfs PLC | 22.68 | 22.47 | 22.47 | 301 | -0.22 | | 0.97 | |
| OIL2 | Wisdomtree Commodity Securities Limited | 700.5 | 684.8 | 684.8 | 1.3K | 3.6 | | 0.53 | |
| OIL3 | UBS AG | 86.17 | 86.17 | 83.71 | 0 | -1.29 | | 1.51 | |
| OILG | UBS AG | 7,466 | 7,466 | 7,618 | 0 | 16 | | 0.21 | |
| OILU | UBS AG | 129.9 | 129.9 | 124.8 | 75 | -1.6 | | 1.26 | |
| OIP9 | Shell International Finance B.V | 98.24 | 98.24 | 98.24 | 300.0K | 0.00 | | 0.00 | |
| OIT | Odyssean Investment Trust PLC | 166.0 | 164.4 | 166.0 | 940.1K | 1.3 | | 0.76 | |
| OM9S | Yorkshire Water Finance PLC | 69.60 | 69.60 | 69.60 | 100.0K | 0.00 | | 0.00 | |
| OMG | Oxford Metrics PLC | 43.00 | 42.80 | 43.00 | 90.0K | -0.30 | | 0.69 | |
| OMI | Orosur Mining INC | 19.50 | 18.55 | 19.50 | 2.88M | -0.10 | | 0.51 | |
| OMIP | One Media Ip Group PLC | 3.975 | 3.975 | 3.750 | 62 | 0.000 | | 0.00 | |
| OMU | Old Mutual Limited | 59.40 | 58.40 | 59.40 | 31.9K | 1.00 | | 1.71 | |
| OMXS | Ishares Iv PLC | 740.0 | 731.5 | 731.5 | 9.2K | -5.0 | | 0.68 | |
| ONDO | Ondo Insurtech PLC | 30.28 | 28.90 | 28.90 | 633.4K | -1.10 | | 3.67 | |
| ONT | Oxford Nanopore Technologies PLC | 148.2 | 133.6 | 140.0 | 5.47M | 6.3 | | 4.71 | |
| ONWD | Onward Opportunities Limited | 138.0 | 137.5 | 138.0 | 159 | 1.5 | | 1.10 | |
| OOA | Octopus Aim Vct PLC | 45.80 | 45.00 | 46.40 | 76.6K | 0.00 | | 0.00 | |
| OPEN | Ishares Iv PLC | 9.547 | 9.547 | 9.547 | 100 | -0.033 | | 0.34 | |
| OPG | Opg Power Ventures PLC | 5.880 | 5.726 | 5.800 | 1.69M | 0.000 | | 0.00 | |
| OPT | Optima Health PLC | 199.5 | 196.0 | 199.5 | 142.2K | 1.5 | | 0.76 | |
| OPTI | Optibiotix Health PLC | 7.900 | 7.750 | 7.900 | 19.5K | 0.150 | | 1.94 | |
| OQ12 | Standard Chartered PLC | 92.69 | 92.69 | 92.69 | 1.63M | 0.00 | | 0.00 | |
| ORC1 | Orchard Bond Finance PLC | 99.3 | 99.3 | 102.0 | 6.6K | 0.0 | | 0.00 | |
| ORCA | Orcadian Energy PLC | 13.50 | 13.00 | 13.30 | 228.3K | -0.70 | | 5.00 | |
| ORCH | Orchard Funding Group PLC | 58.56 | 58.00 | 58.22 | 39.2K | -0.78 | | 1.32 | |
| ORCP | Oracle Power PLC | 0.0550 | 0.0400 | 0.0460 | 749.26M | 0.0050 | | 12.20 | |
| ORIT | Octopus Renewables Infrastructure Trust | 59.00 | 56.50 | 57.80 | 1.76M | -0.10 | | 0.17 | |
| ORNT | Orient Telecoms PLC | 3.220 | 3.200 | 4.000 | 15.0K | 0.000 | | 0.00 | |
| ORR | Oriole Resources PLC | 0.2700 | 0.2650 | 0.2650 | 5.67M | 0.0000 | | 0.00 | |
| OS73 | Toyota Finance Australia Limited | 95.00 | 95.00 | 95.00 | 1.0M | 0.00 | | 0.00 | |
| OSB | Osb Group PLC | 554.0 | 541.0 | 550.0 | 941.0K | -2.5 | | 0.45 | |
| OSEC | Octopus Aim Vct 2 PLC | 37.40 | 37.40 | 34.60 | 2.6K | -1.80 | | 4.95 | |
| OSX5 | Source Markets Public Limited Company | 54.97 | 54.97 | 54.97 | 7.0K | 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 | 12.00 | 12.00 | 14.50 | 70 | 0.00 | | 0.00 | |
| OT3 | Oxford Technology 2 Venture Capital | 8.500 | 5.000 | 8.500 | 55.0K | 1.500 | | 21.43 | |
| OT4 | Oxford Technology 2 Venture Capital | 4.500 | 4.500 | 6.500 | 3.5K | 0.000 | | 0.00 | |
| OTB | On The Beach Group PLC | 212.0 | 207.0 | 210.0 | 490.5K | 0.5 | | 0.24 | |
| OTES | Hellenic Telecommunications Organization | 9.440 | 9.440 | 9.440 | 8 | 0.000 | | 0.00 | |
| OTPD | Otp Bank PLC | 17.00 | 17.00 | 17.00 | 1 | 0.00 | | 0.00 | |
| OTV2 | Octopus Titan Vct PLC | 26.00 | 18.00 | 24.50 | 11.6K | 0.00 | | 0.00 | |
| OUFU | Ossiam Irl Icav | 202.9 | 201.8 | 202.9 | 57 | -0.4 | | 0.20 | |
| OVB | Ovoca Bio PLC | 1.295 | 1.045 | 1.150 | 173.3K | 0.000 | | 0.00 | |
| OVCT | Oberon Aim Vct PLC | 24.00 | 24.00 | 24.00 | 10.0K | -1.10 | | 4.38 | |
| OVZA | Wisdomtree Metal Securities Limited | 123.7 | 120.9 | 122.0 | 100 | 1.0 | | 0.83 | |
| OVZB | Wisdomtree Metal Securities Limited | 110.8 | 108.8 | 110.1 | 100 | 1.0 | | 0.90 | |
| OVZC | Wisdomtree Metal Securities Limited | 38.65 | 38.00 | 38.22 | 423 | 0.33 | | 0.88 | |
| OXA1 | Db Etc PLC | 230.9 | 229.8 | 230.2 | 100 | 0.6 | | 0.28 | |
| OXA2 | Db Etc PLC | 258.0 | 255.3 | 255.4 | 100 | 1.8 | | 0.73 | |
| OXA5 | Db Etc PLC | 333.8 | 330.3 | 332.1 | 123 | 0.6 | | 0.17 | |
| OXA6 | Db Etc PLC | 396.4 | 390.0 | 391.0 | 100 | 4.1 | | 1.06 | |
| OXB | Oxford Biomedica PLC | 656.0 | 621.0 | 621.0 | 277.1K | -16.0 | | 2.51 | |
| OXH | Oxford Technology 2 Venture Capital | 7.500 | 7.500 | 6.000 | 20.0K | 0.000 | | 0.00 | |
| OXIG | Oxford Instruments PLC | 1,882 | 1,780 | 1,786 | 125.5K | -18 | | 1.00 | |
| OZ76 | Nationwide Building Society | 98.25 | 98.25 | 98.25 | 578.0K | 0.00 | | 0.00 | |