| Code | Name | High | Low | Close | Volume | Change | |
|---|
| O | Realty Income Corp | 63.85 | 62.64 | 63.79 | 2,113,600 | 1.11 |  | 1.77 |   |
| OAK | Oaktree Capital Group Llc | 40.50 | 39.72 | 39.99 | 167,500 | -0.34 |  | 0.84 | |
| OAK-A | Oaktree Cap Group Llc Series A Pfd | 24.81 | 24.65 | 24.77 | 9,800 | 0.09 | | 0.36 | |
| OAK-B | Oaktree Capital Group Llc Pfd Unit Ser B | 24.75 | 24.54 | 24.66 | 23,900 | -0.01 | | 0.04 | |
| OAS | Oasis Petroleum Inc | 8.595 | 8.025 | 8.290 | 11,556,700 | -0.200 | | 2.36 | |
| OBE | Obsidian Energy Ltd | 0.6400 | 0.5400 | 0.6100 | 1,584,300 | 0.0700 | | 12.96 | |
| OC | Owens Corning Inc | 49.43 | 48.00 | 49.10 | 1,402,100 | 0.10 | | 0.20 | |
| OCN | Ocwen Financial Corp | 2.600 | 2.310 | 2.440 | 2,724,500 | -0.140 | | 5.43 | |
| ODC | Oil-Dri Corporation of America | 33.01 | 31.05 | 31.17 | 8,300 | -0.61 | | 1.92 | |
| OEC | Orion Engineered Carbons S.A R | 24.09 | 23.59 | 23.86 | 802,800 | -0.08 | | 0.33 | |
| OFC | Corporate Office Properties | 24.80 | 24.48 | 24.71 | 1,396,300 | -0.02 | | 0.08 | |
| OFG | Oriental Financial Group | 18.63 | 18.01 | 18.32 | 536,300 | -0.24 | | 1.29 | |
| OFG-A | Oriental Fin Mips A | 24.23 | 24.14 | 24.17 | 2,200 | -0.13 | | 0.53 | |
| OFG-B | Oriental Finl Pfd B | 24.19 | 24.17 | 24.17 | 500 | -0.01 | | 0.04 | |
| OFG-D | Oriental Financial Group Inc | 24.32 | 24.25 | 24.32 | 1,100 | -0.09 | | 0.35 | |
| OGE | Oge Energy Corp | 39.94 | 39.07 | 39.16 | 2,158,400 | -0.18 | | 0.46 | |
| OGS | One Gas Inc | 84.66 | 83.51 | 84.45 | 289,800 | 1.13 | | 1.36 | |
| OHI | Omega Healthcare Investors | 35.33 | 34.70 | 35.29 | 2,997,000 | 0.94 | | 2.74 | |
| OI | Owens-Illinois | 18.33 | 17.89 | 18.17 | 1,584,300 | 0.10 | | 0.55 | |
| OIA | Invesco Muni Income Trust | 7.120 | 7.060 | 7.090 | 87,800 | 0.010 | | 0.14 | |
| OIB.C | Oi S.A. | 2.980 | 2.820 | 2.890 | 1,582,600 | 0.090 | | 3.21 | |
| OII | Oceaneering International | 18.08 | 17.17 | 17.41 | 1,562,600 | 0.12 | | 0.69 | |
| OIS | Oil States International | 23.09 | 22.26 | 22.95 | 644,800 | 0.43 | | 1.91 | |
| OKE | Oneok Inc | 62.42 | 61.00 | 62.20 | 2,324,900 | 0.84 | | 1.37 | |
| OLN | Olin Corp | 21.33 | 20.72 | 21.07 | 1,734,800 | -0.15 | | 0.71 | |
| OLP | One Liberty Properties | 26.62 | 26.14 | 26.27 | 37,200 | -0.07 | | 0.27 | |
| OMA.U | One Madison Group | 10.21 | 10.15 | 10.20 | 3,200 | -0.01 | | 0.10 | |
| OMA.W | One Madison Corp. Warrants | 1.055 | 1.000 | 1.050 | 11,300 | 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 | 77.48 | 76.42 | 77.10 | 3,607,200 | 0.39 | | 0.51 | |
| OMF | Onemain Holdings Inc | 29.74 | 29.04 | 29.60 | 468,400 | -0.15 | | 0.50 | |
| OMI | Owens & Minor | 8.920 | 8.450 | 8.590 | 877,100 | -0.270 | | 3.05 | |
| OMN | Omnova Solutions Inc | 8.640 | 8.360 | 8.490 | 105,700 | -0.030 | | 0.35 | |
| OMP | Oasis Midstream Partners LP | 20.42 | 19.57 | 19.89 | 128,400 | -0.16 | | 0.80 | |
| ONDK | On Deck Capital Inc | 7.890 | 7.560 | 7.750 | 612,800 | -0.110 | | 1.40 | |
| ONE | Onesmart International Education Group | 7.760 | 7.630 | 7.650 | 84,500 | -0.090 | | 1.16 | |
| OOMA | Ooma Inc | 14.34 | 13.88 | 14.26 | 33,300 | 0.28 | | 2.00 | |
| OPP | Rivernorth/Doubleline Strategic | 16.13 | 16.05 | 16.05 | 24,500 | -0.15 | | 0.93 | |
| OPY | Oppenheimer Holdings | 30.10 | 29.41 | 29.59 | 108,200 | -0.28 | | 0.94 | |
| OR | Osisko Gold Royalties Ltd | 7.670 | 7.510 | 7.600 | 319,100 | 0.150 | | 2.01 | |
| ORA | Ormat Technologies | 52.63 | 51.45 | 52.56 | 198,500 | 0.57 | | 1.10 | |
| ORAN | Orange ADR | 16.76 | 16.58 | 16.73 | 312,900 | 0.12 | | 0.72 | |
| ORC | Orchid Island Capital Inc | 6.700 | 6.590 | 6.700 | 343,800 | 0.080 | | 1.21 | |
| ORCL | Oracle Corp | 51.45 | 50.42 | 51.17 | 20,929,500 | 0.54 | | 1.07 | |
| ORI | Old Republic International Corp | 22.05 | 21.73 | 21.88 | 1,151,100 | -0.16 | | 0.73 | |
| ORN | Orion Group Holdings Inc | 4.670 | 4.380 | 4.430 | 219,100 | -0.220 | | 4.73 | |
| OSB | Norbord Inc | 28.16 | 27.19 | 27.95 | 186,300 | 0.59 | | 2.16 | |
| OSG | Overseas Shipholding Group Inc | 2.470 | 2.130 | 2.370 | 1,179,200 | 0.200 | | 9.22 | |
| OSK | Oshkosh Truck Corp | 67.81 | 66.28 | 66.84 | 821,600 | -0.80 | | 1.18 | |
| OSLE | Oaktree Specialty Lending Corp | 25.10 | 25.08 | 25.10 | 500 | 0.00 | | 0.00 | |
| OUT | Outfront Media Inc | 21.39 | 20.65 | 21.26 | 669,200 | 0.39 | | 1.87 | |
| OXM | Oxford Industries | 90.74 | 87.49 | 89.47 | 175,700 | 0.48 | | 0.54 | |
| OXY | Occidental Petroleum Corp | 73.61 | 72.25 | 73.38 | 4,761,800 | 0.79 | | 1.09 | |
| OZM | Och-Ziff Capital Management | 1.100 | 1.040 | 1.060 | 388,600 | 0.010 | | 0.95 | |