| Name | Code | Last | Cur | M. cap. | Industry |
|---|
| Oracle Power PLC | XLON:ORCP | 0.02 | GBP | 2 | Other Metals & Minerals |
| Orascom Investment Holding SAE | XLON:OIH | 0.01 | GBP | 0 | Integrated Telecommunications Services |
| Orcadian Energy PLC | XLON:ORCA | 9.93 | GBP | 9 | Oil and Gas Exploration & Production |
| Orchard Funding Group PLC | XLON:ORCH | 29.00 | GBP | 7 | Corporate Financial Services |
| Orient Telecoms PLC | XLON:ORNT | 8.00 | GBP | 0 | IT Services & Consulting |
| Origin Enterprises PLC | XLON:OGN | 2.80 | GBP | 317 | Fishing & Farming |
| Oriole Resources PLC | XLON:ORR | 0.26 | GBP | 12 | Gold |
| Orosur Mining Inc | XLON:OMI | 7.05 | GBP | 24 | Gold |
| Oryx International Growth Fund Ltd | XLON:OIG | 1,170.00 | GBP | 201 | Collective Investments |
| OSB Group PLC | XLON:OSB | 370.00 | GBP | 1,690 | Banks |
| Ossiam Shiller Barclays Cape US Sector Value Tr 1C USD Cap | XLON:UCAP | 1,488.54 | USD | | |
| OSSIAM US Minimum Variance NR UCITS 1C USD | XLON:USMV | 331.05 | USD | | |
| Ovoca Bio PLC | XLON:OVB | 1.60 | GBP | 1 | Biotechnology |
| Oxford Biodynamics PLC | XLON:OBD | 1.00 | GBP | 3 | Biotechnology |
| Oxford Biomedica PLC | XLON:OXB | 412.00 | GBP | 536 | Biotechnology |
| Oxford Instruments PLC | XLON:OXIG | 2,025.00 | GBP | 1,445 | Electronic Equipment |
| Oxford Metrics PLC | XLON:OMG | 55.50 | GBP | 87 | Software |
| Oxford Nanopore Technologies PLC | XLON:ONT | 133.30 | GBP | 1,565 | Medical Equipment |
| Oxford Technology 2 Venture Capital Trust PLC | XLON:OXH | 10.50 | GBP | 3 | Corporate Financial Services |
| Pacific Assets Trust plc | XLON:PAC | 372.00 | GBP | | |
| Pacific Horizon | XLON:PHI | 580.00 | GBP | | |
| Pagegroup PLC | XLON:PAGE | 321.20 | GBP | 1,239 | Employment Services |
| Palace Capital PLC | XLON:PCA | 216.00 | GBP | 76 | Other REITs |
| Pan African Resources PLC | XLON:PAF | 36.20 | GBP | 853 | Gold |
| Pantheon Infrastructure PLC | XLON:PINT | 92.40 | GBP | 536 | Investment Management & Fund Operators |
| Pantheon International PLC | XLON:PIN | 317.00 | GBP | 1,799 | Collective Investments |
| Pantheon Resources PLC | XLON:PANR | 35.05 | GBP | 491 | Oil and Gas Exploration & Production |
| Panthera Resources PLC | XLON:PAT | 8.70 | GBP | 21 | Gold |
| Panther Metals Plc | XLON:PALM | 85.50 | GBP | 4 | Gold |
| Panther Securities P L C | XLON:PNS | 320.00 | GBP | 68 | Other REITs |
| Paragon Banking Group PLC | XLON:PAG | 700.50 | GBP | 1,731 | Consumer Lending |
| Parkmead Group PLC | XLON:PMG | 17.75 | GBP | 23 | Oil and Gas Exploration & Production |
| PayPoint plc | XLON:PAY | 728.00 | GBP | 640 | Business Support Services |
| PCI- PAL PLC | XLON:PCIP | 69.00 | GBP | 61 | IT Services & Consulting |
| Pearson PLC | XLON:PSON | 1,304.50 | GBP | 10,897 | Consumer Publishing |
| Pebble Beach Systems Group PLC | XLON:PEB | 10.13 | GBP | 15 | Software |
| Pebble Group PLC | XLON:PEBB | 45.10 | GBP | 90 | Marketing & Advertising |
| Peel Hunt Ltd | XLON:PEEL | 99.00 | GBP | 143 | Investment Management & Fund Operators |
| Pembroke VCT PLC | XLON:PEMB | 96.00 | GBP | 269 | Investment Management & Fund Operators |
| Pennant International Group PLC | XLON:PEN | 28.00 | GBP | 14 | IT Services & Consulting |
| Pennon Group PLC | XLON:PNN | 530.00 | GBP | 1,922 | Water |
| Pennpetro Energy PLC | XLON:PPP | 9.55 | GBP | 11 | Oil and Gas Exploration & Production |
| Pensana PLC | XLON:PRE | 26.80 | GBP | 95 | Rare Earth Elements |
| Pensionbee Group PLC | XLON:PBEE | 158.00 | GBP | 458 | Online Services |
| Persimmon PLC | XLON:PSN | 1,092.00 | GBP | 4,294 | Homebuilding |
| Personal Assets | XLON:PNL | 501.00 | GBP | | |
| Personal Assets Trust PLC | XLON:PNL | 501.00 | GBP | 1,975 | Collective Investments |
| Personal Group Holdings PLC | XLON:PGH | 186.20 | GBP | 71 | Life & Health Insurance |
| Petards Group PLC | XLON:PEG | 7.65 | GBP | 5 | Networking & Communications |
| Petershill Partners PLC | XLON:PHLL | 247.00 | GBP | 3,285 | Investment Management & Fund Operators |