| OAP3 | Octopus Apollo VCT PLC | 47.80 | 44.80 | 47.80 | 100 | 1.50 | | 3.24 | |
| OAUE | UBS Etf | 42.76 | 42.76 | 42.76 | 1.2K | 0.00 | | 0.00 | |
| OBD | Oxford Biodynamics PLC | 0.3000 | 0.2600 | 0.2800 | 3.69M | 0.0000 | | 0.00 | |
| OBI | Ondine Biomedical Inc | 9.000 | 8.310 | 8.500 | 67.2K | 0.000 | | 0.00 | |
| OCDO | Ocado Group PLC | 245.5 | 216.4 | 223.0 | 315.39M | -22.7 | | 9.24 | |
| OCI | Oakley Capital Investments Limited | 542.0 | 528.0 | 528.0 | 602.5K | -10.0 | | 1.86 | |
| OCN | Ocean Wilsons (Holdings) LD | 1,200 | 1,175 | 1,180 | 33.8K | 0 | | 0.00 | |
| OCTF | First Trust Global Funds Public Limited | 1,994 | 1,994 | 1,994 | 0 | -17 | | 0.84 | |
| OE08 | Bank Of Montreal | 100.4 | 100.4 | 100.4 | 1.0M | 0.0 | | 0.00 | |
| OE61 | The Kingdom Of Morocco | 108.0 | 108.0 | 108.0 | 200.0K | 0.0 | | 0.00 | |
| OFG | Octopus Future Generations VCT plc | 79.50 | 79.50 | 79.50 | 0 | 0.00 | | 0.00 | |
| OGDC | OGDC | 8.000 | 8.000 | 8.000 | 0 | 0.000 | | 0.00 | |
| OGG9 | Gold Bullion Securities LD | 424.0 | 410.6 | 410.6 | 178 | 7.5 | | 1.87 | |
| OGLD | Deutsche Boerse Commodities Gmbh | 149.1 | 137.7 | 142.6 | 4.6K | 0.3 | | 0.20 | |
| OGN | Origin Enterprises Plc | 4.165 | 4.110 | 4.110 | 25.4K | 0.000 | | 0.00 | |
| OGOL | Global X Metal Securities | 68.00 | 68.00 | 68.00 | 603 | 11.65 | | 20.67 | |
| OGZU | Wisdomtree Metal Securities Limited | 443.4 | 412.7 | 422.4 | 100 | -1.6 | | 0.38 | |
| OHGR | One Health Group Plc | 250.0 | 247.2 | 250.0 | 6.6K | 0.0 | | 0.00 | |
| OI20 | Kingdom Of Saudi Arabia (The) | 105.3 | 105.3 | 105.3 | 11.0M | 0.0 | | 0.00 | |
| OIG | Oryx International Growth Fund | 1,269 | 1,220 | 1,253 | 9.1K | 13 | | 1.01 | |
| OIGB | Vaneck Ucits Etfs Plc - Vaneck Oil | 20.83 | 20.08 | 20.48 | 29.6K | 0.44 | | 2.19 | |
| OIH | Orascom Investment Holding S.A.E | 0.0150 | 0.0140 | 0.0140 | 1.8K | 0.0000 | | 0.00 | |
| OIHV | VanEck Oil Services ETF A USD Acc | 28.78 | 27.91 | 28.38 | 781.4K | 0.71 | | 2.55 | |
| OIL2 | Wisdomtree Commodity Securities Limited | 800.5 | 748.1 | 783.9 | 6.6K | 57.9 | | 7.97 | |
| OIL3 | UBS AG | 92.07 | 92.07 | 92.07 | 0 | 3.20 | | 3.60 | |
| OILG | UBS AG UBS ETC (CMCI WTI) GBP | 8,133 | 8,133 | 8,133 | 0 | 211 | | 2.66 | |
| OILU | UBS AG | 133.4 | 133.4 | 133.4 | 0 | 3.5 | | 2.71 | |
| OIP9 | Shell International Finance B.V | 97.70 | 97.70 | 97.70 | 0 | 0.00 | | 0.00 | |
| OIT | Odyssean Investment Trust PLC | 182.0 | 177.0 | 178.5 | 148.5K | 0.0 | | 0.00 | |
| OM9S | Yorkshire Water Finance PLC | 69.60 | 69.60 | 69.60 | 100.0K | 0.00 | | 0.00 | |
| OMG | Oxford Metrics plc | 57.00 | 55.40 | 57.00 | 535.2K | 0.60 | | 1.06 | |
| OMI | Orosur Mining Inc | 40.50 | 36.17 | 37.40 | 5.92M | -1.70 | | 4.35 | |
| OMIP | One Media iP Group Plc | 3.750 | 3.500 | 3.750 | 926 | 0.000 | | 0.00 | |
| OMU | Old Mutual Ltd | 73.45 | 71.20 | 72.20 | 120.5K | 2.20 | | 3.14 | |
| OMXS | iShares OMX Stockholm Capped UCITS | 829.0 | 819.8 | 821.0 | 24.0K | 6.5 | | 0.80 | |
| ONDO | Ondo InsurTech PLC | 18.50 | 17.50 | 18.00 | 287.2K | 0.00 | | 0.00 | |
| ONT | Oxford Nanopore Technologies Ltd | 165.0 | 156.5 | 158.0 | 40.34M | -4.8 | | 2.95 | |
| ONWD | Onward Opportunities Ltd | 149.0 | 147.1 | 147.5 | 23.2K | -0.5 | | 0.34 | |
| OOA | Octopus Aim Vct Plc | 46.80 | 45.40 | 45.40 | 946 | 0.00 | | 0.00 | |
| OPEN | iShares Thomson Reuters Inclusion and | 10.25 | 10.25 | 10.25 | 0 | -0.04 | | 0.38 | |
| OPG | Opg Power Ventures PLC | 5.700 | 5.300 | 5.400 | 1.25M | 0.000 | | 0.00 | |
| OPT | Optima Health plc | 218.0 | 215.0 | 216.5 | 176.0K | 0.0 | | 0.00 | |
| OPTI | OptiBiotix Health Plc | 7.500 | 7.000 | 7.250 | 486.7K | 0.000 | | 0.00 | |
| OQ12 | Standard Chartered PLC | 92.54 | 92.54 | 92.54 | 0 | 0.00 | | 0.00 | |
| ORC1 | Orchard Bond Finance PLC | 100.7 | 100.7 | 101.4 | 0 | 0.0 | | 0.00 | |
| ORCA | Orcadian Energy PLC | 22.00 | 19.60 | 21.40 | 786.8K | 1.40 | | 7.00 | |
| ORCH | Orchard Funding Group PLC | 61.00 | 59.00 | 60.00 | 2.7K | 0.00 | | 0.00 | |
| ORCP | Oracle Coalfields Plc | 0.0700 | 0.0550 | 0.0700 | 223.91M | 0.0025 | | 3.70 | |
| ORIT | Octopus Renewables Infrastructure Trust | 57.00 | 55.30 | 55.30 | 2.17M | -1.40 | | 2.47 | |
| ORNT | Orient Telecoms | 4.000 | 4.000 | 4.000 | 0 | 0.000 | | 0.00 | |
| ORR | Oriole Resources PLC | 0.3900 | 0.3600 | 0.3750 | 50.32M | 0.0100 | | 2.74 | |
| OS73 | Toyota Finance Australia Limited | 95.93 | 95.93 | 95.93 | 0 | 0.00 | | 0.00 | |
| OSB | OneSavings Bank PLC | 611.5 | 600.5 | 602.5 | 44.37M | -2.5 | | 0.41 | |
| OSEC | Octopus Aim Vct 2 PLC | 36.00 | 36.00 | 36.00 | 0 | 0.00 | | 0.00 | |
| OSX5 | Source Markets Public Limited Company | 57.80 | 57.12 | 57.12 | 0 | -0.51 | | 0.88 | |
| OT06 | Derwent London PLC | 72.10 | 72.10 | 72.10 | 9.6K | 0.00 | | 0.00 | |
| OT1 | Oxford Technology 2 Venture Capital | 14.50 | 14.50 | 14.50 | 0 | 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 | 220.0 | 214.5 | 219.0 | 7.76M | 4.0 | | 1.86 | |
| OTES | Hellenic Telecommunications Organization | 9.900 | 9.900 | 9.900 | 0 | 0.020 | | 0.20 | |
| OTPD | OTP Bank Plc | 17.00 | 17.00 | 17.00 | 0 | 0.00 | | 0.00 | |
| OTV2 | Octopus Titan Vct PLC | 21.50 | 21.50 | 21.50 | 0 | 0.00 | | 0.00 | |
| OUFU | Ossiam Irl Icav | 207.1 | 207.1 | 205.2 | 3 | -1.0 | | 0.49 | |
| OVB | Ovoca Bio PLC | 7.500 | 5.000 | 7.500 | 926.3K | 2.000 | | 36.36 | |
| OVCT | Oberon Aim Vct PLC | 25.70 | 25.70 | 25.70 | 0 | 0.00 | | 0.00 | |
| OVZA | Wisdomtree Metal Securities Limited | 214.3 | 193.4 | 199.3 | 108 | -2.9 | | 1.44 | |
| OVZB | Wisdomtree Metal Securities Limited | 162.9 | 149.1 | 154.0 | 161 | -1.1 | | 0.72 | |
| OVZC | Wisdomtree Metal Securities Limited | 92.45 | 81.30 | 81.30 | 78.2K | -5.81 | | 6.67 | |
| OXA1 | Db Etc PLC | 316.9 | 300.1 | 302.9 | 851 | 0.9 | | 0.30 | |
| OXA2 | Db Etc PLC | 636.2 | 563.3 | 592.3 | 442 | -6.5 | | 1.08 | |
| OXA5 | Db Etc PLC | 444.6 | 413.0 | 424.9 | 100 | 1.3 | | 0.32 | |
| OXA6 | Db Etc PLC | 949.3 | 844.0 | 844.0 | 419 | -50.2 | | 5.61 | |
| OXB | Oxford BioMedica PLC | 862.0 | 844.0 | 850.0 | 5.59M | -5.0 | | 0.58 | |
| OXH | Oxford Technology 2 Venture Capital | 8.000 | 8.000 | 7.000 | 20.0K | 0.500 | | 7.69 | |
| OXIG | Oxford Instruments PLC | 2,555 | 2,490 | 2,495 | 5.86M | -45 | | 1.77 | |
| OZ76 | Nationwide Building Society | 98.25 | 98.25 | 98.25 | 578.0K | 0.00 | | 0.00 | |