| Code | Name | High | Low | Close | Volume | Change | |
|---|
| O | Realty Income Corp | 70.50 | 69.47 | 69.92 | 1,073,200 | 0.06 |  | 0.09 |   |
| OAK | Oaktree Capital Group Llc | 50.41 | 49.98 | 50.01 | 281,700 | -0.19 |  | 0.38 | |
| OAK-A | Oaktree Cap Group Llc Series A Pfd | 26.68 | 26.54 | 26.68 | 6,900 | 0.12 | | 0.45 | |
| OAK-B | Oaktree Capital Group Llc Pfd Unit Ser B | 26.50 | 26.34 | 26.47 | 20,800 | -0.07 | | 0.26 | |
| OAS | Oasis Petroleum Inc | 4.803 | 4.430 | 4.440 | 10,394,900 | -0.340 | | 7.11 | |
| OBE | Obsidian Energy Ltd | 1.040 | 0.990 | 1.020 | 213,000 | 0.022 | | 2.18 | |
| OC | Owens Corning Inc | 57.24 | 55.84 | 56.04 | 1,371,200 | -1.38 | | 2.40 | |
| OCN | Ocwen Financial Corp | 2.120 | 1.960 | 1.990 | 670,200 | -0.120 | | 5.69 | |
| ODC | Oil-Dri Corp of America | 34.34 | 33.97 | 34.10 | 4,900 | -0.32 | | 0.93 | |
| OEC | Orion Engineered Carbons S.A R | 18.87 | 18.39 | 18.60 | 871,900 | -0.10 | | 0.53 | |
| OFC | Corporate Office Properties | 26.99 | 26.39 | 26.68 | 909,900 | -0.12 | | 0.45 | |
| OFG | Oriental Financial Group | 23.47 | 22.91 | 23.03 | 423,700 | -0.52 | | 2.21 | |
| OFG-A | Oriental Fin Mips A | 25.62 | 25.55 | 25.59 | 3,100 | 0.07 | | 0.28 | |
| OFG-B | Oriental Finl Pfd B | 25.42 | 25.28 | 25.35 | 4,100 | -0.09 | | 0.34 | |
| OFG-D | Oriental Financial Group Inc | 25.66 | 25.66 | 25.66 | 100 | -0.01 | | 0.04 | |
| OGE | Oge Energy Corp | 43.52 | 43.10 | 43.13 | 818,300 | 0.10 | | 0.23 | |
| OGS | One Gas Inc | 91.54 | 90.86 | 91.26 | 124,100 | 0.40 | | 0.44 | |
| OHI | Omega Healthcare Investors | 37.22 | 36.82 | 37.07 | 1,369,100 | 0.29 | | 0.79 | |
| OI | Owens-Illinois | 17.12 | 16.82 | 16.90 | 596,300 | -0.06 | | 0.35 | |
| OIA | Invesco Muni Income Trust | 7.698 | 7.660 | 7.660 | 85,600 | 0.000 |  | 0.00 | |
| OIB.C | Oi S.A. | 2.010 | 1.960 | 1.970 | 1,280,300 | -0.030 | | 1.50 | |
| OII | Oceaneering International | 18.86 | 17.86 | 17.98 | 988,100 | -0.90 | | 4.77 | |
| OIS | Oil States International | 14.77 | 13.84 | 13.88 | 886,700 | -0.82 | | 5.58 | |
| OKE | Oneok Inc | 70.32 | 69.50 | 69.64 | 1,995,700 | -0.51 | | 0.73 | |
| OLN | Olin Corp | 21.89 | 21.21 | 21.31 | 1,523,400 | -0.46 | | 2.11 | |
| OLP | One Liberty Properties | 28.40 | 27.92 | 28.19 | 49,300 | 0.06 | | 0.21 | |
| OMC | Omnicom Group Inc | 83.96 | 80.02 | 81.57 | 3,315,700 | -2.45 | | 2.92 | |
| OMF | Onemain Holdings Inc | 34.68 | 33.83 | 34.01 | 423,500 | -0.79 | | 2.27 | |
| OMI | Owens & Minor | 3.050 | 2.820 | 2.830 | 929,500 | -0.220 | | 7.21 | |
| OMN | Omnova Solutions Inc | 9.990 | 9.975 | 9.990 | 550,800 | 0.000 | | 0.00 | |
| OMP | Oasis Midstream Partners LP | 21.96 | 21.63 | 21.95 | 379,600 | 0.19 | | 0.87 | |
| ONDK | On Deck Capital Inc | 4.050 | 3.910 | 3.920 | 431,300 | -0.070 | | 1.75 | |
| ONE | Onesmart International Education Group | 8.240 | 8.060 | 8.120 | 65,900 | -0.080 | | 0.98 | |
| OOMA | Ooma Inc | 12.17 | 11.86 | 11.92 | 47,000 | -0.01 | | 0.08 | |
| OPP | Rivernorth/Doubleline Strategic | 17.58 | 17.45 | 17.45 | 35,900 | -0.04 | | 0.23 | |
| OPY | Oppenheimer Holdings | 30.70 | 30.15 | 30.46 | 84,400 | 0.09 | | 0.30 | |
| OR | Osisko Gold Royalties Ltd | 11.04 | 10.75 | 11.00 | 1,001,300 | 0.31 | | 2.90 | |
| ORA | Ormat Technologies | 63.52 | 61.92 | 63.10 | 243,800 | -0.15 | | 0.24 | |
| ORAN | Orange ADR | 14.98 | 14.88 | 14.93 | 426,500 | 0.00 | | 0.00 | |
| ORC | Orchid Island Capital Inc | 6.580 | 6.480 | 6.560 | 329,300 | 0.000 | | 0.00 | |
| ORCL | Oracle Corp | 58.95 | 57.99 | 57.99 | 9,090,900 | -0.62 | | 1.06 | |
| ORI | Old Republic International Corp | 23.20 | 22.93 | 22.93 | 1,248,400 | -0.23 | | 0.99 | |
| ORN | Orion Group Holdings Inc | 4.450 | 3.821 | 3.900 | 1,491,700 | 0.120 | | 3.17 | |
| OSB | Norbord Inc | 24.03 | 23.17 | 23.29 | 90,500 | -0.57 | | 2.39 | |
| OSG | Overseas Shipholding Group Inc | 1.980 | 1.830 | 1.900 | 246,500 | -0.040 | | 2.06 | |
| OSK | Oshkosh Truck Corp | 85.33 | 82.73 | 82.75 | 613,800 | -3.01 | | 3.51 | |
| OSLE | Oaktree Specialty Lending Corp | 25.48 | 25.38 | 25.42 | 5,000 | -0.05 | | 0.20 | |
| OUT | Outfront Media Inc | 26.61 | 26.27 | 26.53 | 581,300 | 0.16 | | 0.61 | |
| OXM | Oxford Industries | 71.53 | 69.57 | 70.01 | 194,400 | -1.05 | | 1.48 | |
| OXY | Occidental Petroleum Corp | 51.55 | 50.91 | 51.18 | 7,615,200 | 0.08 | | 0.16 | |
| OZM | Och-Ziff Capital Management | 22.92 | 22.42 | 22.71 | 154,700 | -0.19 | | 0.83 | |