| Code | Name | Close | Previous | Change |
| OAH | Oak Holdings Ord 1p | 32.500 | 32.500 | 0.000 |  | 0.00% |
| OBP | Ondine Bio | 37.500 | 40.500 | 0.000 | | 0.00% |
| OBS | Orbis | 0.7500 | 0.7500 | 0.0000 | | 0.00% |
| OBT | OBTALA RESOURCES PLC ORD GBP0.01 | 37.000 | 38.500 | -1.500 |  | 3.90% |
| OBY | OBAYASHI CORP NPV | 563.00 | 563.00 | 0.00 | | 0.00% |
| OC | OCE NV EUR0.50 | 9.7800 | 9.9900 | -0.2100 | | 2.10% |
| OCG | OXFORD CATALYSTS GROUP ord gbp0.01 | 169.50 | 171.73 | -2.23 | | 1.30% |
| OCH | orchid developments group ord eur0.01 | 129.50 | 129.50 | 0.00 | | 0.00% |
| OCL | OAKLEY CAPITAL INVESTMENTS LTD ORD GBP0.01 | 96.000 | 96.000 | 0.000 | | 0.00% |
| OCLW | OAKLEY CAPITAL INVESTMENTS LTD WTS TO SUB FOR ORD | 6.0000 | 6.0000 | 0.0000 | | 0.00% |
| OCN | Ocean Wilson Hdg | 935.00 | 910.00 | 25.00 |  | 2.75% |
| OCP | ORCHID CHEMICAL & PHARMACEUTICAL GDR EACH REPR INR | 7.5300 | 7.5300 | 0.0000 | | 0.00% |
| OCR | Oneclickhr | 3.3750 | 3.2250 | 0.1500 | | 4.65% |
| OCT | OCTOPUS PROTECTED VCT PLC ORD GBP0.10 | 93.000 | 93.000 | 0.000 | | 0.00% |
| OCZ | OCZ TECHNOLOGY GROUP INC COM STK USD0.001 `REGS` | 20.500 | 20.250 | 0.250 | | 1.23% |
| ODX | QUINTESSENTIALLY ENGLISH ORD GBP0.01 | 28.500 | 28.500 | 0.000 | | 0.00% |
| OEM | Oem Plc | 20.500 | 20.500 | 0.000 | | 0.00% |
| OEX | oilex nl ord npv | 54.000 | 52.000 | 2.000 | | 3.85% |
| OFF | OFFICE2OFFICE ORD GBP0.01 | 183.25 | 183.00 | 0.25 | | 0.14% |
| OGDC | OIL & GAS DEVELOPMENT CO GDR EACH REPR 10 ORD `REG | 19.100 | 19.000 | 0.100 | | 0.53% |
| OGK2 | OGK 2 GDR EACH REPR 100 ORD `REGS` | 15.500 | 8.750 | 6.750 | | 77.14% |
| OGN | ORIGIN ENTERPRISES PLC ORD EUR0.01 | 5.3500 | 5.4500 | -0.1000 | | 1.83% |
| OGZD | GAZPROM OAO ADS EACH REPR 4 ORD SHS | 61.500 | 59.700 | 1.800 | | 3.02% |
| OHM | Offshore Hydrocarbon Mapping Ord 1p | 69.400 | 71.400 | -2.000 | | 2.80% |
| OHT | Orad Hi-tec Systems Ld Ord Ils 0.01 | 200.00 | 200.00 | 0.00 | | 0.00% |
| OIG | Oryx Intl | 234.00 | 234.00 | 0.00 | | 0.00% |
| OIH | OMEGA IURANCE HLDGS LTD COM STK USD0.10 | 156.00 | 152.75 | 3.25 | | 2.13% |
| OIL | Oilexco Inc Com Shs Npv | 831.00 | 820.00 | 11.00 | | 1.34% |
| OILB | ETFS OIL SECURITIES LTD ETFS BRENT OIL | 106.49 | 105.89 | 0.60 | | 0.57% |
| OILW | ETFS OIL SECURITIES LTD ETFS WTI OIL | 117.94 | 117.29 | 0.65 | | 0.55% |
| OKD | Oakdene Homes Ord 1p | 51.500 | 48.000 | 3.500 | | 7.29% |
| OKE | OKI ELECTRIC INDUSTRY CO NPV | 425.50 | 425.50 | 0.00 | | 0.00% |
| OLBP | ETFS OIL SECURITIES LTD ETFS BRENT OIL (GBP) | 5,362.0 | 5,362.0 | 0.0 | | 0.00% |
| OLWP | ETFS OIL SECURITIES LTD ETFS WTI OIL (GBP) | 5,747.5 | 5,421.5 | 0.0 | | 0.00% |
| OME | Omega International Group Ord 10p | 248.00 | 247.20 | 0.80 | | 0.32% |
| OMG | OMG Ltd | 51.695 | 54.000 | -2.305 | | 4.27% |
| OMH | Osmetech | 18.500 | 18.060 | 0.440 | | 2.44% |
| OML | Old Mutual | 123.00 | 121.60 | 1.40 | | 1.15% |
| OMT | Old Mut Sa | 189.50 | 189.50 | 0.00 | | 0.00% |
| OMZD | UTD HEAVY MACHINERY URALMASH-IZHORA ADR EACH REPR | 7.7500 | 7.7500 | 0.0000 | | 0.00% |
| ONL | On-line | 20.000 | 20.000 | 0.000 | | 0.00% |
| OPD | psd group ORD GBP0.05 | 170.00 | 170.00 | 0.00 | | 0.00% |
| OPF | Off-Plan Fund | 74.250 | 74.250 | 0.000 | | 0.00% |
| OPM | 1PM PLC ORD GBP0.0006818 | 0.2250 | 0.2250 | 0.0000 | | 0.00% |
| OPN | IBS OPEYSTEMS ORD GBP0.05 | 150.00 | 151.00 | -1.00 | | 0.66% |
| OPS | Optimisa | 170.00 | 170.00 | 0.00 | | 0.00% |
| OPT | Ocean Power Technologies Inc Com Shs Usd0.001reg S | 453.00 | 460.00 | -7.00 | | 1.52% |
| OPTS | OPTOS ORD GBP0.02 | 172.00 | 172.00 | 0.00 | | 0.00% |
| OPUS | OPUS ALTERNATIVE STRATEGIES FUND OASF DIVERSIFIED | 137.00 | 137.00 | 0.00 | | 0.00% |
| ORA | ORA CAPITAL PARTNERS PLC ORD GBP0.01 | 150.30 | 149.00 | 1.30 | | 0.87% |
| ORCA | Orca Interact | 23.000 | 22.250 | 0.750 | | 3.37% |
| ORDI | ORDINA NV EUR0.10 | 9.9700 | 9.6800 | 0.2900 | | 3.00% |
| ORE | ARICOM ORD GBP0.001 | 102.25 | 98.00 | 4.25 | | 4.34% |
| OREW | ARICOM WTS TO SUB FOR ORD | 38.000 | 30.250 | 7.750 | | 25.62% |
| ORI | Oriflame | 111.25 | 112.50 | -1.25 | | 1.11% |
| ORIW | ORIEL RESOURCES WTS 8/2/10(TO SUBSCRIBE FOR ORD) | 31.000 | 33.000 | -2.000 | | 6.06% |
| ORM | Ormonde Mining | 11.925 | 11.750 | 0.175 | | 1.49% |
| ORP | ORIGO RESOURCES PARTNERS LTD ORD NPV | 141.00 | 140.00 | 1.00 | | 0.71% |
| ORPK | orpak systems ord ils0.02 | 157.50 | 159.00 | -1.50 | | 0.94% |
| ORPW | ORIGO RESOURCES PARTNERS LTD WTS TO SUB FOR ORD | 47.500 | 47.000 | 0.500 | | 1.06% |
| ORSD | ORASCOM CONSTRUCTIONS INDUSTRY GDR EACH REPR 2 ORD | 140.00 | 138.25 | 1.75 | | 1.27% |
| OSB1 | ETFS OIL SECURITIES LTD ETFS BRENT OIL 1YR | 127.88 | 127.88 | 0.00 | | 0.00% |
| OSB2 | ETFS OIL SECURITIES LTD ETFS BRENT OIL 2YR | 107.48 | 109.34 | -1.86 | | 1.70% |
| OSB3 | ETFS OIL SECURITIES LTD ETFS BRENT OIL 3YR | 124.75 | 123.50 | 1.25 | | 1.01% |
| OSG | APPLIED OPTICAL TECHNOLOGIES GBP0.05 | 52.000 | 51.000 | 1.000 | | 1.96% |
| OSI | ORIGO SINO-INDIA PLC ORD GBP0.00000001 | 55.500 | 53.500 | 2.000 | | 3.74% |
| OSIW | ORIGO SINO-INDIA PLC WTS TO SUB FOR ORD | 28.750 | 28.750 | 0.000 | | 0.00% |
| OSP | Osprey Smaller Companies Inc Fd Ld Ord 10p | 128.25 | 130.75 | -2.50 | | 1.91% |
| OSW1 | ETFS OIL SECURITIES LTD ETFS WTI OIL 1YR | 130.04 | 128.52 | 1.52 | | 1.18% |
| OSW2 | ETFS OIL SECURITIES LTD ETFS WTI OIL 2YR | 106.88 | 108.90 | -2.02 | | 1.85% |
| OSW3 | ETFS OIL SECURITIES LTD ETFS WTI OIL 3YR | 124.14 | 123.90 | 0.24 | | 0.19% |
| OTE | o twelve estates ord gbp0.01 | 35.718 | 35.750 | -0.032 | | 0.09% |
| OTES | HELLENIC TELECOM.ORGANIZATION S.A. ADS EACH REP 1/ | 10.000 | 10.000 | 0.000 | | 0.00% |
| OTLD | ORASCOM TELECOM HLDGS S.A.E. GDR EACH REPR 5 ORD ` | 71.500 | 71.200 | 0.300 | | 0.42% |
| OTM | ottoman fund(the) ord npv | 78.500 | 78.500 | 0.000 | | 0.00% |
| OTPD | OTP BANK GDR-EACH REPR 2 ORD HUF100(REG S) | 96.000 | 91.500 | 4.500 | | 4.92% |
| OTT | Oxford Tech | 52.000 | 52.000 | 0.000 | | 0.00% |
| OTV1 | OCTOPUS TITAN VCT 1 PLC ORD GBP0.10 | 100.00 | 100.00 | 0.00 | | 0.00% |
| OTV2 | OCTOPUS TITAN VCT 2 PLC ORD GBP0.10 | 100.00 | 100.00 | 0.00 | | 0.00% |
| OVD | OVIDIA INVESTMENTS PLC ORD GBP0.001 | 1.0000 | 1.0000 | 0.0000 | | 0.00% |
| OVG | Ovoca Resources | 10.039 | 10.220 | -0.181 | | 1.77% |
| OXA | OXFORD ADVANCED SURFACES GR PLC ORD GBP0.01 | 93.500 | 93.500 | 0.000 | | 0.00% |
| OXB | Oxford Biomedica | 23.750 | 23.750 | 0.000 | | 0.00% |
| OXE | OXECO PLC ORD GBP0.001 | 5.0000 | 5.0000 | 0.0000 | | 0.00% |
| OXF | OXFORD TECHNOLOGY 4 VCT ORD GBP0.10 | 45.000 | 50.000 | -5.000 | | 10.00% |
| OXH | Oxford Technology 2 Venture Capital Trust plc | 38.000 | 38.000 | 0.000 | | 0.00% |
| OXIG | Oxford Instruments | 225.00 | 220.00 | 5.00 | | 2.27% |
| OXN | oxonica ord gbp0.01 | 22.500 | 24.000 | -1.500 | | 6.25% |
| OXS | Oxus Mining Ord | 27.000 | 26.000 | 1.000 | | 3.85% |
| OXT | Oxford Technology Vct | 27.500 | 27.500 | 0.000 | | 0.00% |
