| Code | Name | High | Low | Close | Volume | Change | |
|---|
| O | Realty Income Corp | 71.00 | 70.41 | 70.74 | 887,534 | 0.16 |  | 0.23 |   |
| OAK | Oaktree Capital Group Llc | 48.74 | 48.52 | 48.68 | 422,222 | 0.15 | | 0.31 | |
| OAK-A | Oaktree Cap Group Llc Series A Pfd | 25.77 | 25.71 | 25.76 | 10,203 | 0.10 | | 0.39 | |
| OAK-B | Oaktree Capital Group Llc Pfd Unit Ser B | 25.72 | 25.61 | 25.67 | 19,855 | 0.00 |  | 0.00 | |
| OAS | Oasis Petroleum Inc | 5.060 | 4.800 | 4.930 | 9,196,302 | -0.030 |  | 0.60 | |
| OBE | Obsidian Energy Ltd | 0.2500 | 0.2500 | 0.2500 | 758,365 | 0.0080 | | 3.31 | |
| OC | Owens Corning Inc | 50.13 | 49.33 | 49.95 | 529,912 | 0.96 | | 1.96 | |
| OCN | Ocwen Financial Corp | 1.710 | 1.630 | 1.680 | 47,629 | 0.050 | | 3.07 | |
| ODC | Oil-Dri Corp of America | 29.46 | 29.00 | 29.38 | 3,272 | 0.11 | | 0.38 | |
| OEC | Orion Engineered Carbons S.A R | 18.25 | 17.60 | 17.87 | 281,385 | -0.10 | | 0.56 | |
| OFC | Corporate Office Properties | 28.46 | 28.09 | 28.29 | 154,055 | 0.20 | | 0.71 | |
| OFG | Oriental Financial Group | 19.47 | 18.95 | 19.47 | 83,721 | 0.64 | | 3.40 | |
| OFG-A | Oriental Fin Mips A | 25.23 | 25.17 | 25.21 | 2,619 | -0.02 | | 0.08 | |
| OFG-B | Oriental Finl Pfd B | 25.28 | 25.08 | 25.14 | 12,130 | -0.03 | | 0.11 | |
| OFG-D | Oriental Financial Group Inc | 25.58 | 25.32 | 25.58 | 1,600 | 0.05 | | 0.20 | |
| OGE | Oge Energy Corp | 43.36 | 43.00 | 43.02 | 526,126 | 0.01 | | 0.02 | |
| OGS | One Gas Inc | 89.50 | 88.78 | 89.12 | 73,308 | 0.31 | | 0.35 | |
| OHI | Omega Healthcare Investors | 36.78 | 36.24 | 36.41 | 1,151,422 | 0.01 | | 0.03 | |
| OI | Owens-Illinois | 16.85 | 16.72 | 16.85 | 308,320 | 0.10 | | 0.60 | |
| OIA | Invesco Muni Income Trust | 7.550 | 7.500 | 7.500 | 31,819 | -0.020 | | 0.27 | |
| OIB.C | Oi S.A. | 1.810 | 1.770 | 1.790 | 1,697,270 | 0.010 | | 0.56 | |
| OII | Oceaneering International | 17.21 | 16.74 | 16.85 | 308,519 | -0.07 | | 0.41 | |
| OIS | Oil States International | 17.26 | 16.76 | 16.91 | 190,014 | -0.04 | | 0.24 | |
| OKE | Oneok Inc | 65.99 | 65.24 | 65.75 | 838,352 | 0.42 | | 0.64 | |
| OLN | Olin Corp | 22.10 | 20.94 | 21.10 | 1,968,269 | -0.39 | | 1.81 | |
| OLP | One Liberty Properties | 29.78 | 29.36 | 29.41 | 17,658 | -0.13 | | 0.44 | |
| OMA.U | One Madison Group | 10.84 | 10.82 | 10.82 | 1,300 | 0.00 | | 0.01 | |
| OMA.W | One Madison Corp Warrants | 1.440 | 1.440 | 1.440 | 400 | -0.010 | | 0.69 | |
| OMAD | One Madison Corp Cl A | 10.27 | 10.15 | 10.15 | 55,680 | -0.01 | | 0.10 | |
| OMC | Omnicom Group Inc | 79.92 | 78.77 | 78.93 | 636,014 | -0.26 | | 0.33 | |
| OMF | Onemain Holdings Inc | 31.70 | 31.19 | 31.50 | 275,583 | 0.49 | | 1.58 | |
| OMI | Owens & Minor | 3.580 | 3.400 | 3.490 | 716,257 | 0.040 | | 1.16 | |
| OMN | Omnova Solutions Inc | 6.140 | 6.020 | 6.100 | 45,539 | 0.010 | | 0.16 | |
| OMP | Oasis Midstream Partners LP | 20.99 | 20.62 | 20.93 | 18,490 | 0.20 | | 0.96 | |
| ONDK | On Deck Capital Inc | 4.540 | 4.280 | 4.410 | 488,936 | -0.120 | | 2.65 | |
| ONE | Onesmart International Education Group | 7.490 | 7.060 | 7.340 | 230,801 | 0.010 | | 0.14 | |
| OOMA | Ooma Inc | 12.70 | 11.80 | 12.04 | 72,336 | 0.29 | | 2.47 | |
| OPP | Rivernorth/Doubleline Strategic | 17.08 | 16.95 | 16.98 | 15,572 | -0.01 | | 0.06 | |
| OPY | Oppenheimer Holdings | 26.08 | 25.65 | 26.01 | 18,856 | 0.33 | | 1.29 | |
| OR | Osisko Gold Royalties Ltd | 9.900 | 9.700 | 9.770 | 179,667 | -0.090 | | 0.91 | |
| ORA | Ormat Technologies | 59.48 | 58.95 | 59.16 | 46,721 | 0.21 | | 0.36 | |
| ORAN | Orange ADR | 15.66 | 15.53 | 15.54 | 288,127 | 0.15 | | 0.97 | |
| ORC | Orchid Island Capital Inc | 6.560 | 6.530 | 6.550 | 277,558 | 0.020 | | 0.31 | |
| ORCL | Oracle Corp | 53.47 | 52.59 | 52.87 | 6,125,139 | -0.21 | | 0.40 | |
| ORI | Old Republic International Corp | 22.53 | 22.30 | 22.51 | 740,788 | 0.17 | | 0.76 | |
| ORN | Orion Group Holdings Inc | 2.030 | 1.870 | 1.960 | 776,617 | 0.120 | | 6.52 | |
| OSB | Norbord Inc | 21.17 | 20.88 | 21.08 | 127,793 | 0.16 | | 0.76 | |
| OSG | Overseas Shipholding Group Inc | 1.750 | 1.670 | 1.710 | 223,628 | 0.020 | | 1.18 | |
| OSK | Oshkosh Truck Corp | 76.38 | 75.49 | 76.01 | 235,007 | 0.81 | | 1.08 | |
| OSLE | Oaktree Specialty Lending Corp | 25.35 | 25.27 | 25.27 | 1,016 | -0.06 | | 0.25 | |
| OUT | Outfront Media Inc | 25.26 | 25.06 | 25.14 | 251,093 | 0.08 | | 0.32 | |
| OXM | Oxford Industries | 74.89 | 73.03 | 74.25 | 86,147 | 0.97 | | 1.32 | |
| OXY | Occidental Petroleum Corp | 53.98 | 53.03 | 53.49 | 11,341,360 | 0.58 | | 1.10 | |
| OZM | Och-Ziff Capital Management | 19.16 | 18.41 | 18.91 | 70,777 | 0.44 | | 2.38 | |