| Code | Name | High | Low | Close | Volume | Change | |
|---|
| O | Realty Income Corp | 64.56 | 63.57 | 63.86 | 2,446,500 | -0.11 |  | 0.17 |   |
| OAK | Oaktree Capital Group Llc | 39.93 | 39.20 | 39.28 | 447,600 | -0.59 | | 1.48 | |
| OAK-A | Oaktree Cap Group Llc Series A Pfd | 24.52 | 24.32 | 24.49 | 40,600 | -0.03 | | 0.12 | |
| OAK-B | Oaktree Capital Group Llc Pfd Unit Ser B | 24.49 | 23.75 | 24.10 | 68,700 | -0.26 | | 1.07 | |
| OAS | Oasis Petroleum Inc | 7.760 | 7.200 | 7.340 | 16,230,400 | -0.710 | | 8.82 | |
| OBE | Obsidian Energy Ltd | 0.5900 | 0.5200 | 0.5500 | 1,933,800 | -0.0600 | | 9.84 | |
| OC | Owens Corning Inc | 50.57 | 48.00 | 49.43 | 1,641,100 | 0.48 |  | 0.98 | |
| OCN | Ocwen Financial Corp | 2.495 | 2.170 | 2.290 | 2,580,200 | -0.170 | | 6.91 | |
| ODC | Oil-Dri Corporation of America | 31.00 | 29.24 | 29.92 | 23,400 | -0.90 | | 2.92 | |
| OEC | Orion Engineered Carbons S.A R | 25.27 | 23.55 | 24.52 | 672,900 | 0.71 | | 2.98 | |
| OFC | Corporate Office Properties | 24.83 | 24.24 | 24.34 | 1,594,200 | -0.38 | | 1.54 | |
| OFG | Oriental Financial Group | 18.14 | 17.22 | 17.22 | 379,500 | -0.92 | | 5.07 | |
| OFG-A | Oriental Fin Mips A | 24.28 | 24.01 | 24.25 | 4,900 | 0.08 | | 0.33 | |
| OFG-B | Oriental Finl Pfd B | 24.35 | 24.14 | 24.35 | 4,600 | 0.18 | | 0.74 | |
| OFG-D | Oriental Financial Group Inc | 24.45 | 24.25 | 24.45 | 4,700 | 0.07 | | 0.29 | |
| OGE | Oge Energy Corp | 39.97 | 38.96 | 39.21 | 2,244,400 | -0.30 | | 0.76 | |
| OGS | One Gas Inc | 86.54 | 83.77 | 84.32 | 270,100 | -0.78 | | 0.92 | |
| OHI | Omega Healthcare Investors | 36.55 | 35.29 | 36.48 | 4,834,300 | 1.02 | | 2.88 | |
| OI | Owens-Illinois | 17.63 | 17.15 | 17.26 | 918,300 | -0.31 | | 1.76 | |
| OIA | Invesco Muni Income Trust | 7.080 | 7.050 | 7.050 | 40,100 | -0.030 | | 0.42 | |
| OIB.C | Oi S.A. | 2.600 | 1.910 | 2.010 | 467,400 | -0.740 | | 26.91 | |
| OII | Oceaneering International | 17.61 | 16.77 | 16.93 | 1,085,200 | -0.50 | | 2.87 | |
| OIS | Oil States International | 22.38 | 21.60 | 22.08 | 459,100 | -0.76 | | 3.33 | |
| OKE | Oneok Inc | 61.69 | 59.98 | 60.34 | 2,274,200 | -1.94 | | 3.11 | |
| OLN | Olin Corp | 20.26 | 19.34 | 19.87 | 2,419,400 | -0.18 | | 0.90 | |
| OLP | One Liberty Properties | 26.34 | 25.76 | 25.80 | 29,300 | -0.41 | | 1.56 | |
| OMA.U | One Madison Group | 10.24 | 10.19 | 10.24 | 200 | 0.04 | | 0.39 | |
| OMA.W | One Madison Corp. Warrants | 1.050 | 1.050 | 1.050 | 100 | 0.000 |  | 0.00 | |
| OMAD | One Madison Corporation Class A | 9.750 | 9.730 | 9.730 | 1,400 | -0.020 | | 0.21 | |
| OMC | Omnicom Group Inc | 76.59 | 75.04 | 75.70 | 2,816,100 | -1.15 | | 1.50 | |
| OMF | Onemain Holdings Inc | 28.62 | 27.46 | 27.65 | 680,400 | -1.28 | | 4.42 | |
| OMI | Owens & Minor | 8.870 | 8.290 | 8.430 | 930,000 | -0.340 | | 3.88 | |
| OMN | Omnova Solutions Inc | 8.390 | 8.110 | 8.240 | 95,100 | -0.060 | | 0.72 | |
| OMP | Oasis Midstream Partners LP | 20.31 | 19.40 | 19.45 | 72,200 | -0.85 | | 4.19 | |
| ONDK | On Deck Capital Inc | 7.600 | 7.200 | 7.310 | 757,800 | -0.220 | | 2.92 | |
| ONE | Onesmart International Education Group | 7.565 | 7.360 | 7.440 | 97,500 | -0.150 | | 1.98 | |
| OOMA | Ooma Inc | 13.79 | 13.25 | 13.48 | 26,600 | -0.07 | | 0.52 | |
| OPP | Rivernorth/Doubleline Strategic | 16.03 | 15.35 | 15.91 | 102,100 | -0.12 | | 0.75 | |
| OPY | Oppenheimer Holdings | 29.38 | 28.13 | 28.22 | 85,300 | -1.26 | | 4.27 | |
| OR | Osisko Gold Royalties Ltd | 7.650 | 7.385 | 7.520 | 358,200 | -0.100 | | 1.31 | |
| ORA | Ormat Technologies | 52.75 | 51.42 | 52.56 | 165,700 | 0.16 | | 0.31 | |
| ORAN | Orange ADR | 16.65 | 16.49 | 16.57 | 376,500 | -0.16 | | 0.96 | |
| ORC | Orchid Island Capital Inc | 6.740 | 6.600 | 6.680 | 673,000 | -0.060 | | 0.89 | |
| ORCL | Oracle Corp | 49.07 | 47.96 | 48.33 | 19,389,600 | -1.22 | | 2.46 | |
| ORI | Old Republic International Corp | 21.83 | 21.47 | 21.57 | 1,329,500 | -0.25 | | 1.15 | |
| ORN | Orion Group Holdings Inc | 4.370 | 4.220 | 4.270 | 267,000 | -0.100 | | 2.29 | |
| OSB | Norbord Inc | 28.47 | 27.24 | 28.08 | 241,400 | 0.02 | | 0.07 | |
| OSG | Overseas Shipholding Group Inc | 2.310 | 2.140 | 2.160 | 774,500 | -0.190 | | 8.09 | |
| OSK | Oshkosh Truck Corp | 66.41 | 63.81 | 65.29 | 1,168,400 | -0.80 | | 1.21 | |
| OSLE | Oaktree Specialty Lending Corp | 25.20 | 25.08 | 25.20 | 3,200 | 0.08 | | 0.32 | |
| OUT | Outfront Media Inc | 21.18 | 20.39 | 20.43 | 1,115,600 | -0.70 | | 3.31 | |
| OXM | Oxford Industries | 87.96 | 83.80 | 84.76 | 165,700 | -3.08 | | 3.51 | |
| OXY | Occidental Petroleum Corp | 72.78 | 69.71 | 70.30 | 4,476,400 | -3.06 | | 4.17 | |
| OZM | Och-Ziff Capital Management | 1.080 | 1.010 | 1.020 | 394,700 | -0.030 | | 2.86 | |