| Code | Name | High | Low | Close | Volume | Change |
|---|
| ODY | AB Svensk Ekportkredit (Swedish Export | 6.130 | 5.600 | 6.130 | 22,400 | 0.130 |  | 2.17 |
| OEF | Ishares S&p 100 Index Fund | 39.35 | 36.34 | 39.01 | 5,469,600 | 2.20 | | 5.98 |
| OFI | Overhill Farms Inc. | 3.710 | 3.300 | 3.450 | 52,600 | 0.170 |  | 4.70 |
| OHB | Orleans Homebuilders Inc. | 2.000 | 1.850 | 1.850 | 3,500 | 0.190 | | 9.31 |
| OIH | Merrill Lynch Market Oil Service HOLDRS | 73.82 | 66.58 | 73.82 | 16,966,000 | 6.62 | | 9.85 |
| OIL | IPATH ETN CRUDE OIL | 29.47 | 27.96 | 29.31 | 326,700 | 0.97 | | 3.42 |
| OKN | Oceanaut Inc. | 7.630 | 7.620 | 7.620 | 4,300 | 0.000 |  | 0.00 |
| OKN.U | Oceanaut Inc. | 7.600 | 7.600 | 7.600 | 1,000 | 0.010 | | 0.13 |
| OKN.W | Oceanaut Inc. | 0.0400 | 0.0400 | 0.0400 | 5,200 | 0.0100 | | 33.33 |
| OLE | 9.25 STRIDES ORACLE | 18.45 | 17.82 | 18.45 | 10,600 | 0.27 | | 1.44 |
| OLO | POWERSHARES DB CRUDE | 10.45 | 10.20 | 10.38 | 4,200 | 0.14 | | 1.37 |
| ONI | Oragenics Inc. | 0.4000 | 0.3600 | 0.3800 | 9,800 | 0.0100 | | 2.70 |
| ONT | On2 Technologies Inc. | 0.2600 | 0.2200 | 0.2400 | 509,100 | 0.0000 | | 0.00 |
| OOO | SPDR O-Strip Exchange Traded Fund | 1.350 | 1.350 | 1.350 | 25,000 | 0.010 | | 0.75 |
| OOO.U | Stream Global Services Inc | 1.400 | 1.340 | 1.400 | 400 | 0.300 | | 27.27 |
| OOO.W | Stream Global Services Inc | 0.0900 | 0.0900 | 0.0900 | 43,600 | 0.0400 | | 80.00 |
| OPK | Opko Health Inc | 1.250 | 1.140 | 1.220 | 157,600 | 0.020 | | 1.61 |
| ORS | Orsus Xelent Technolgies Inc. | 0.3400 | 0.2700 | 0.3200 | 125,700 | 0.0100 | | 3.23 |
| OTP | Claymore Exchange-Traded Fund Trust | 16.02 | 15.90 | 16.02 | 2,700 | 0.20 | | 1.26 |
| OTR | Claymore Exchange-Traded Fund Trust | 14.36 | 13.89 | 14.36 | 11,000 | 0.50 | | 3.36 |
| OZN | Orezone Res Inc | 0.2100 | 0.1600 | 0.1700 | 824,800 | 0.0100 | | 5.56 |