| Code | Name | High | Low | Close | Volume | Change | |
|---|
| O | Realty Income Corp | 51.96 | 51.36 | 51.66 | 4,008,300 | -0.06 |  | 0.12 |   |
| OA | Orbital Atk Inc | 133.6 | 133.5 | 133.6 | 280,100 | 0.0 |  | 0.03 | |
| OAK | Oaktree Capital Group Llc | 40.10 | 39.45 | 39.80 | 185,600 | -0.10 | | 0.25 | |
| OAK-A | Five Oaks Investment Corp 8.75 | 25.35 | 25.32 | 25.35 | 700 | -0.01 | | 0.02 | |
| OAKS | Five Oaks Investment Corp | 3.260 | 3.200 | 3.250 | 88,300 | 0.050 | | 1.56 | |
| OAS | Oasis Petroleum Inc | 12.79 | 12.48 | 12.74 | 6,932,700 | -0.02 | | 0.16 | |
| OBE | Obsidian Energy Ltd | 1.210 | 1.170 | 1.180 | 1,460,300 | -0.020 | | 1.67 | |
| OC | Owens Corning Inc | 66.41 | 65.30 | 66.00 | 1,799,700 | 0.43 | | 0.66 | |
| OCIP | Oci Partners LP | 10.32 | 10.25 | 10.27 | 39,700 | 0.04 | | 0.39 | |
| OCN | Ocwen Financial Corp | 4.690 | 4.590 | 4.600 | 562,600 | -0.050 | | 1.08 | |
| ODC | Oil-Dri Corporation of America | 37.50 | 36.94 | 37.50 | 5,100 | 0.41 | | 1.11 | |
| OEC | Orion Engineered Carbons S.A R | 30.20 | 27.55 | 27.55 | 744,200 | -0.15 | | 0.54 | |
| OFC | Corporate Office Properties | 26.80 | 26.45 | 26.66 | 611,800 | 0.05 | | 0.19 | |
| OFG | Oriental Financial Group | 14.55 | 14.10 | 14.25 | 272,200 | -0.05 | | 0.35 | |
| OFG-A | Oriental Fin Mips A | 23.91 | 23.90 | 23.90 | 2,900 | 0.10 | | 0.42 | |
| OFG-B | Oriental Finl Pfd B | 23.40 | 23.34 | 23.36 | 3,800 | -0.07 | | 0.30 | |
| OFG-D | Oriental Financial Group Inc | 24.09 | 24.00 | 24.05 | 7,500 | 0.05 | | 0.21 | |
| OGE | Oge Energy Corp | 33.69 | 33.22 | 33.35 | 1,545,400 | 0.04 | | 0.12 | |
| OGS | One Gas Inc | 71.32 | 70.63 | 70.80 | 176,300 | 0.19 | | 0.27 | |
| OHI | Omega Healthcare Investors | 28.68 | 28.27 | 28.42 | 1,233,400 | 0.05 | | 0.18 | |
| OI | Owens-Illinois | 18.75 | 18.57 | 18.63 | 844,500 | 0.08 | | 0.43 | |
| OIA | Invesco Muni Income Trust | 7.420 | 7.350 | 7.370 | 68,400 | 0.000 |  | 0.00 | |
| OIB.C | Oi S.A. | 5.580 | 5.290 | 5.480 | 428,000 | -0.240 | | 4.20 | |
| OII | Oceaneering International | 24.56 | 24.22 | 24.49 | 1,019,700 | 0.23 | | 0.95 | |
| OIS | Oil States International | 38.15 | 37.75 | 37.95 | 389,700 | -0.05 | | 0.13 | |
| OKE | Oneok Inc | 66.67 | 65.80 | 66.27 | 1,865,200 | -0.25 | | 0.38 | |
| OLN | Olin Corp | 33.41 | 33.08 | 33.22 | 1,685,100 | 0.03 | | 0.09 | |
| OLP | One Liberty Properties | 25.14 | 24.56 | 24.59 | 54,200 | -0.21 | | 0.85 | |
| OMA.U | One Madison Group | 10.03 | 10.01 | 10.01 | 5,800 | -0.02 | | 0.20 | |
| OMAD | One Madison Corporation Class A | 9.590 | 9.590 | 9.590 | 300 | -0.020 | | 0.21 | |
| OMC | Omnicom Group Inc | 75.46 | 74.45 | 74.96 | 1,219,500 | 0.66 | | 0.89 | |
| OMF | Onemain Holdings Inc | 34.97 | 34.39 | 34.54 | 313,500 | 0.02 | | 0.06 | |
| OMI | Owens & Minor | 17.05 | 16.66 | 16.79 | 473,900 | -0.11 | | 0.65 | |
| OMN | Omnova Solutions Inc | 10.35 | 10.10 | 10.25 | 206,600 | 0.15 | | 1.49 | |
| OMP | Oasis Midstream Partners LP | 19.54 | 19.16 | 19.41 | 50,100 | -0.28 | | 1.42 | |
| ONDK | On Deck Capital Inc | 5.940 | 5.810 | 5.880 | 197,900 | -0.030 | | 0.51 | |
| ONE | Onesmart International Education Group | 10.85 | 10.46 | 10.75 | 129,500 | 0.27 | | 2.58 | |
| OOMA | Ooma Inc | 12.40 | 11.10 | 12.10 | 128,600 | 0.80 | | 7.08 | |
| OPP | Rivernorth/Doubleline Strategic | 17.57 | 17.40 | 17.46 | 36,200 | 0.03 | | 0.17 | |
| OPY | Oppenheimer Holdings | 29.05 | 28.80 | 28.85 | 36,300 | -0.10 | | 0.35 | |
| OR | Osisko Gold Royalties Ltd | 10.26 | 10.02 | 10.18 | 974,000 | 0.11 | | 1.09 | |
| ORA | Ormat Technologies | 53.42 | 52.41 | 52.70 | 152,600 | -0.62 | | 1.16 | |
| ORAN | Orange ADR | 17.10 | 16.91 | 16.99 | 263,300 | -0.23 | | 1.34 | |
| ORC | Orchid Island Capital Inc | 7.250 | 7.170 | 7.230 | 465,600 | 0.050 | | 0.70 | |
| ORCL | Oracle Corp | 46.79 | 46.24 | 46.32 | 13,517,300 | -0.22 | | 0.47 | |
| ORI | Old Republic International Corp | 21.07 | 20.87 | 21.04 | 1,191,300 | 0.12 | | 0.57 | |
| ORN | Orion Group Holdings Inc | 7.460 | 7.350 | 7.430 | 63,800 | 0.130 | | 1.78 | |
| OSB | Norbord Inc | 41.18 | 40.60 | 41.12 | 86,900 | 0.16 | | 0.39 | |
| OSG | Overseas Shipholding Group Inc | 3.620 | 3.450 | 3.510 | 459,700 | -0.050 | | 1.40 | |
| OSK | Oshkosh Truck Corp | 77.37 | 76.47 | 77.20 | 539,500 | 0.72 | | 0.94 | |
| OSLE | Oaktree Specialty Lending Corp | 25.40 | 25.03 | 25.20 | 8,000 | 0.08 | | 0.32 | |
| OUT | Outfront Media Inc | 19.92 | 19.64 | 19.78 | 508,100 | -0.06 | | 0.30 | |
| OXM | Oxford Industries | 80.29 | 78.80 | 79.01 | 134,700 | -1.02 | | 1.27 | |
| OXY | Occidental Petroleum Corp | 86.10 | 84.99 | 85.42 | 3,498,500 | -0.74 | | 0.86 | |
| OZM | Och-Ziff Capital Management | 2.080 | 2.020 | 2.040 | 426,900 | -0.020 | | 0.97 | |