| Code | Name | High | Low | Close | Volume | Change | |
|---|
| O | Realty Income Corp | 49.61 | 48.85 | 48.98 | 777,022 | -0.55 |  | 1.11 |   |
| OA | Orbital Atk Inc | 132.9 | 132.7 | 132.8 | 105,223 | 0.0 |  | 0.02 | |
| OAK | Oaktree Capital Group Llc | 41.60 | 41.10 | 41.30 | 108,931 | -0.30 | | 0.72 | |
| OAK-A | Five Oaks Investment Corp 8.75 | 25.25 | 25.20 | 25.23 | 4,896 | 0.01 | | 0.04 | |
| OAKS | Five Oaks Investment Corp | 2.880 | 2.800 | 2.820 | 58,324 | -0.040 | | 1.40 | |
| OAS | Oasis Petroleum Inc | 10.32 | 9.91 | 10.29 | 5,162,104 | 0.13 | | 1.28 | |
| OBE | Obsidian Energy Ltd | 1.140 | 1.100 | 1.140 | 773,090 | 0.000 |  | 0.00 | |
| OC | Owens Corning Inc | 78.68 | 76.89 | 78.37 | 552,508 | 1.16 | | 1.50 | |
| OCIP | Oci Partners LP | 9.550 | 9.480 | 9.550 | 2,050 | 0.000 | | 0.00 | |
| OCN | Ocwen Financial Corp | 4.120 | 4.030 | 4.110 | 402,915 | 0.050 | | 1.23 | |
| ODC | Oil-Dri Corporation of America | 40.95 | 39.32 | 40.49 | 5,971 | -0.47 | | 1.15 | |
| OEC | Orion Engineered Carbons S.A R | 29.05 | 28.55 | 28.63 | 101,272 | -0.32 | | 1.11 | |
| OFC | Corporate Office Properties | 26.84 | 26.42 | 26.60 | 332,802 | -0.20 | | 0.75 | |
| OFG | Oriental Financial Group | 13.25 | 12.64 | 12.85 | 173,605 | -0.10 | | 0.77 | |
| OFG-A | Oriental Fin Mips A | 23.62 | 23.51 | 23.51 | 3,925 | 0.02 | | 0.06 | |
| OFG-B | Oriental Finl Pfd B | 23.28 | 23.22 | 23.28 | 970 | -0.03 | | 0.14 | |
| OFG-D | Oriental Financial Group Inc | 23.58 | 23.55 | 23.55 | 2,600 | -0.04 | | 0.17 | |
| OGE | Oge Energy Corp | 32.74 | 32.40 | 32.46 | 755,975 | -0.01 | | 0.03 | |
| OGS | One Gas Inc | 68.16 | 67.53 | 67.71 | 57,971 | 0.16 | | 0.24 | |
| OHI | Omega Healthcare Investors | 25.53 | 25.27 | 25.35 | 796,202 | -0.01 | | 0.04 | |
| OI | Owens-Illinois | 21.73 | 21.44 | 21.50 | 528,368 | -0.13 | | 0.60 | |
| OIA | Invesco Muni Income Trust | 7.490 | 7.450 | 7.470 | 43,159 | -0.010 | | 0.13 | |
| OIB.C | Oi S.A. | 5.640 | 5.490 | 5.550 | 242,502 | 0.100 | | 1.83 | |
| OII | Oceaneering International | 20.36 | 19.91 | 20.25 | 331,282 | 0.17 | | 0.85 | |
| OIS | Oil States International | 32.60 | 32.00 | 32.45 | 330,617 | -0.15 | | 0.46 | |
| OKE | Oneok Inc | 60.28 | 59.26 | 59.79 | 740,601 | 0.25 | | 0.42 | |
| OLN | Olin Corp | 30.69 | 29.52 | 30.13 | 1,236,662 | 0.61 | | 2.07 | |
| OLP | One Liberty Properties | 23.23 | 22.98 | 23.09 | 22,593 | 0.09 | | 0.39 | |
| OMA.U | One Madison Group | 9.950 | 9.950 | 9.950 | 2,766 | -0.010 | | 0.10 | |
| OMAD | One Madison Corporation Class A | 9.600 | 9.490 | 9.600 | 26,700 | 0.000 | | 0.00 | |
| OMC | Omnicom Group Inc | 74.12 | 73.37 | 73.69 | 671,152 | -0.05 | | 0.07 | |
| OMF | Onemain Holdings Inc | 30.93 | 30.38 | 30.59 | 275,803 | 0.27 | | 0.89 | |
| OMI | Owens & Minor | 15.27 | 14.97 | 14.99 | 495,561 | -0.12 | | 0.79 | |
| OMN | Omnova Solutions Inc | 11.60 | 11.35 | 11.57 | 33,443 | 0.07 | | 0.61 | |
| OMP | Oasis Midstream Partners LP | 17.86 | 17.63 | 17.74 | 33,064 | 0.00 | | 0.00 | |
| ONDK | On Deck Capital Inc | 5.470 | 5.200 | 5.360 | 263,156 | -0.110 | | 2.01 | |
| ONE | Onesmart International Education Group | 10.86 | 10.60 | 10.76 | 72,427 | 0.03 | | 0.28 | |
| OOMA | Ooma Inc | 11.20 | 11.10 | 11.15 | 5,605 | 0.00 | | 0.00 | |
| OPP | Rivernorth/Doubleline Strategic | 17.69 | 17.61 | 17.65 | 18,020 | 0.08 | | 0.46 | |
| OPY | Oppenheimer Holdings | 27.05 | 26.67 | 26.95 | 18,582 | -0.05 | | 0.19 | |
| OR | Osisko Gold Royalties Ltd | 9.800 | 9.630 | 9.690 | 196,626 | -0.200 | | 2.02 | |
| ORA | Ormat Technologies | 58.52 | 57.77 | 58.37 | 91,615 | 0.65 | | 1.13 | |
| ORAN | Orange ADR | 18.24 | 18.17 | 18.21 | 145,778 | 0.09 | | 0.50 | |
| ORC | Orchid Island Capital Inc | 7.460 | 7.420 | 7.450 | 214,523 | 0.040 | | 0.54 | |
| ORCL | Oracle Corp | 46.47 | 45.91 | 45.92 | 7,167,716 | -0.31 | | 0.67 | |
| ORI | Old Republic International Corp | 21.62 | 21.46 | 21.47 | 426,192 | -0.03 | | 0.14 | |
| ORN | Orion Group Holdings Inc | 6.750 | 6.580 | 6.690 | 17,847 | -0.100 | | 1.47 | |
| OSB | Norbord Inc | 42.00 | 41.36 | 41.51 | 55,218 | -0.12 | | 0.29 | |
| OSG | Overseas Shipholding Group Inc | 4.020 | 3.790 | 3.940 | 521,948 | -0.040 | | 1.01 | |
| OSK | Oshkosh Truck Corp | 81.42 | 80.77 | 81.00 | 189,041 | -0.06 | | 0.07 | |
| OSLE | Oaktree Specialty Lending Corp | 25.31 | 25.14 | 25.31 | 295 | 0.12 | | 0.48 | |
| OUT | Outfront Media Inc | 18.47 | 18.07 | 18.08 | 496,513 | -0.14 | | 0.77 | |
| OXM | Oxford Industries | 77.90 | 76.27 | 77.12 | 30,398 | 0.87 | | 1.14 | |
| OXY | Occidental Petroleum Corp | 76.82 | 75.67 | 76.67 | 1,890,262 | 0.20 | | 0.26 | |
| OZM | Och-Ziff Capital Management | 2.320 | 2.200 | 2.200 | 698,270 | -0.130 | | 5.58 | |