| OAP3 | Octopus Apollo Vct Plc | 46.70 | 46.70 | 46.70 | 0 | 0.00 | | 0.00 | |
| OAUE | UBS Etf | 125.6 | 125.6 | 125.6 | 333 | 0.0 | | 0.00 | |
| OBD | Oxford Biodynamics Plc | 0.2100 | 0.1800 | 0.1950 | 5.04M | 0.0050 | | 2.63 | |
| OBI | Ondine Biomedical Inc | 11.60 | 11.25 | 11.50 | 159.2K | 0.25 | | 2.22 | |
| OCDO | Ocado Group Plc | 191.5 | 182.9 | 191.5 | 6.37M | 9.1 | | 4.96 | |
| OCI | Oakley Capital Investments Limited | 510.0 | 492.0 | 492.0 | 125.9K | -16.0 | | 3.15 | |
| OCTF | First Trust Global Funds Public Limited | 2,058 | 2,058 | 2,058 | 0 | 6 | | 0.27 | |
| OE08 | Bank Of Montreal | 100.4 | 100.4 | 100.4 | 1.0M | 0.0 | | 0.00 | |
| OE61 | The Kingdom Of Morocco | 107.4 | 107.4 | 107.4 | 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 | 8.000 | 8.000 | 8.000 | 0 | 0.000 | | 0.00 | |
| OGG9 | Gold Bullion Securities | 374.4 | 369.2 | 369.2 | 100 | -1.3 | | 0.35 | |
| OGLD | Deutsche Boerse Commodities Gmbh | 131.6 | 131.2 | 131.2 | 4.5K | 0.9 | | 0.70 | |
| OGN | Origin Enterprises Plc | 405.0 | 405.0 | 405.0 | 0 | 0.0 | | 0.00 | |
| OGOL | Global X Metal Securities | 56.35 | 56.35 | 56.35 | 42 | 0.00 | | 0.00 | |
| OGZU | Wisdomtree Metal Securities Limited | 391.7 | 389.7 | 391.4 | 100 | 10.4 | | 2.72 | |
| OHGR | One Health Group Plc | 246.4 | 242.0 | 245.0 | 2.3K | 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 | 1,260 | 1,188 | 1,223 | 4.8K | -18 | | 1.41 | |
| OIGB | Vaneck Oil Services Ucits ETF | 24.52 | 24.20 | 24.32 | 15.0K | -0.41 | | 1.66 | |
| 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 | 33.32 | 32.84 | 33.11 | 10.4K | -0.33 | | 0.99 | |
| OIL2 | Wisdomtree WTI Crude Oil 2X Daily Lev | 1,545 | 1,498 | 1,545 | 7.6K | 11 | | 0.72 | |
| OIL3 | UBS Etc [Cmci WTI 3M] USD | 132.1 | 132.1 | 132.1 | 0 | 0.0 | | 0.00 | |
| OILG | UBS Etc [Cmci Wti] GBP | 10,408 | 10,408 | 10,408 | 0 | 0 | | 0.00 | |
| OILU | UBS Etc [Ubs BBG CMCI WTI Crude Idx] USD | 172.5 | 172.5 | 172.5 | 992 | 1.2 | | 0.70 | |
| OIP9 | Shell International Finance B.V | 97.40 | 97.40 | 97.40 | 0 | 0.00 | | 0.00 | |
| OIT | Odyssean Investment Trust Plc | 189.5 | 187.0 | 188.3 | 147.5K | 0.3 | | 0.13 | |
| OM9S | Yorkshire Water Finance PLC | 77.40 | 77.40 | 77.40 | 0 | 0.00 | | 0.00 | |
| OMG | Oxford Metrics Plc | 49.45 | 47.10 | 49.30 | 173.2K | 0.20 | | 0.41 | |
| OMI | Orosur Mining Inc | 23.00 | 21.00 | 21.50 | 2.57M | 0.55 | | 2.63 | |
| OMIP | One Media Ip Group Plc | 3.200 | 3.200 | 3.200 | 0 | 0.000 | | 0.00 | |
| OMU | Old Mutual Limited | 62.02 | 60.40 | 60.80 | 295.0K | -1.00 | | 1.62 | |
| OMXS | Ishares Omx Stockholm Capped Ucits ETF | 839.8 | 833.0 | 833.0 | 4.7K | -1.5 | | 0.18 | |
| ONDO | Ondo Insurtech Plc | 15.00 | 14.81 | 15.00 | 7.1K | 0.40 | | 2.74 | |
| ONT | Oxford Nanopore Technologies Plc | 118.6 | 113.2 | 116.2 | 1.88M | 3.3 | | 2.92 | |
| ONWD | Onward Opportunities Limited | 128.8 | 123.0 | 126.0 | 60.8K | 0.0 | | 0.00 | |
| OOA | Octopus Aim Vct Plc | 37.20 | 37.20 | 37.20 | 0 | 0.00 | | 0.00 | |
| OPEN | Ish Re Incl / Diversity ETF | 10.56 | 10.56 | 10.56 | 255 | 0.04 | | 0.33 | |
| OPT | Optima Health Plc | 182.0 | 178.0 | 180.0 | 281.8K | 0.0 | | 0.00 | |
| OPTI | Optibiotix Health Plc | 5.300 | 5.200 | 5.300 | 74.2K | 0.000 | | 0.00 | |
| OQ12 | Standard Chartered PLC | 91.02 | 91.02 | 91.02 | 0 | 0.00 | | 0.00 | |
| ORC1 | Orchard Bond Finance PLC | 100.0 | 100.0 | 100.8 | 0 | 2.2 | | 2.21 | |
| ORCA | Orcadian Energy Plc | 17.00 | 15.40 | 16.00 | 116.7K | 0.00 | | 0.00 | |
| ORCH | Orchard Funding Group Plc | 59.00 | 55.00 | 57.50 | 12.8K | 1.00 | | 1.77 | |
| ORCP | Oracle Power Plc | 0.0750 | 0.0540 | 0.0630 | 0 | 0.0130 | | 26.00 | |
| ORIT | Octopus Renewables Infrastructure Trust | 60.40 | 59.10 | 59.70 | 1.62M | -0.80 | | 1.32 | |
| ORNT | Orient Telecoms Plc | 4.000 | 4.000 | 4.000 | 0 | 0.000 | | 0.00 | |
| ORR | Oriole Resources Plc | 0.3400 | 0.3200 | 0.3300 | 24.1M | 0.0000 | | 0.00 | |
| OS73 | Toyota Finance Australia Limited | 95.17 | 95.17 | 95.17 | 0 | 0.00 | | 0.00 | |
| OSB | Osb Group Plc | 561.5 | 553.5 | 554.0 | 826.4K | -5.5 | | 0.98 | |
| OSEC | Octopus Aim Vct 2 Plc | 30.60 | 29.60 | 29.60 | 3.8K | 0.00 | | 0.00 | |
| OSX5 | Source Markets Public Limited Company | 57.44 | 57.14 | 57.44 | 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 | 14.50 | 14.50 | 14.50 | 0 | 0.00 | | 0.00 | |
| OT3 | Oxford Technology 2 Venture Capital | 8.500 | 7.500 | 7.500 | 25.0K | 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 | 181.0 | 174.2 | 175.8 | 384.1K | -1.8 | | 1.01 | |
| OTES | Hellenic Telecommunications Organization | 10.85 | 10.20 | 10.72 | 100 | 0.22 | | 2.10 | |
| OTPD | Gdr [Each Repr 1/2 Ord Huf100][Reg S] | 17.00 | 17.00 | 17.00 | 0 | 0.00 | | 0.00 | |
| OTV2 | Octopus Titan Vct Plc | 20.50 | 20.50 | 20.50 | 0 | 0.00 | | 0.00 | |
| OVCT | Oberon Aim Vct Plc | 23.50 | 20.00 | 23.50 | 1.0K | 0.00 | | 0.00 | |
| OVZA | Wisdomtree Metal Securities Limited | 165.1 | 158.3 | 158.3 | 100 | -3.1 | | 1.92 | |
| OVZB | Wisdomtree Metal Securities Limited | 124.1 | 121.2 | 121.2 | 100 | -0.7 | | 0.60 | |
| OVZC | Wisdomtree Metal Securities Limited | 62.08 | 58.34 | 58.34 | 1.3K | 0.31 | | 0.53 | |
| OXA1 | Physical Gold Euro Hdg Etc | 274.2 | 271.2 | 271.2 | 715 | 8.4 | | 3.19 | |
| OXA2 | Physical Silver Euro Hdg Etc | 407.4 | 406.9 | 407.4 | 112 | 20.6 | | 5.33 | |
| OXA5 | Physical Gold Etc 27/08/60 | 392.4 | 390.5 | 392.4 | 163 | 2.2 | | 0.55 | |
| OXA6 | Physical Silver Etc 27/08/60 | 605.2 | 605.2 | 605.2 | 100 | 1.8 | | 0.29 | |
| OXB | Oxford Biomedica Plc | 648.0 | 621.0 | 621.0 | 267.2K | -4.0 | | 0.64 | |
| OXH | Oxford Technology 2 Venture Capital | 7.000 | 7.000 | 7.000 | 0 | 0.000 | | 0.00 | |
| OXIG | Oxford Instruments Plc | 2,824 | 2,742 | 2,744 | 408.7K | -48 | | 1.72 | |
| OZ76 | Nationwide Building Society | 98.25 | 98.25 | 98.25 | 578.0K | 0.00 | | 0.00 | |