| Code | Name | High | Low | Close | Volume | Change | |
|---|
| O | Realty Income Corp | 64.84 | 63.77 | 64.77 | 1,265,400 | 0.94 |  | 1.47 |   |
| OAK | Oaktree Capital Group Llc | 41.25 | 40.38 | 41.21 | 103,400 | 0.78 | | 1.93 | |
| OAK-A | Oaktree Cap Group Llc Series A Pfd | 24.83 | 24.51 | 24.77 | 17,200 | 0.17 | | 0.69 | |
| OAK-B | Oaktree Capital Group Llc Pfd Unit Ser B | 24.49 | 24.20 | 24.49 | 29,200 | 0.34 | | 1.41 | |
| OAS | Oasis Petroleum Inc | 6.580 | 6.410 | 6.500 | 7,405,700 | 0.090 | | 1.40 | |
| OBE | Obsidian Energy Ltd | 0.5000 | 0.4800 | 0.4900 | 165,400 | 0.0100 | | 2.08 | |
| OC | Owens Corning Inc | 47.18 | 45.88 | 47.13 | 2,401,200 | 0.36 | | 0.77 | |
| OCN | Ocwen Financial Corp | 1.955 | 1.830 | 1.920 | 663,100 | 0.060 | | 3.23 | |
| ODC | Oil-Dri Corporation of America | 29.06 | 27.91 | 28.21 | 7,700 | 0.05 | | 0.18 | |
| OEC | Orion Engineered Carbons S.A R | 27.18 | 26.54 | 26.69 | 489,600 | -0.27 |  | 1.00 | |
| OFC | Corporate Office Properties | 23.30 | 22.92 | 23.19 | 416,000 | 0.15 | | 0.65 | |
| OFG | Oriental Financial Group | 17.71 | 17.06 | 17.70 | 391,900 | 0.41 | | 2.37 | |
| OFG-A | Oriental Fin Mips A | 24.29 | 24.16 | 24.29 | 2,100 | 0.04 | | 0.16 | |
| OFG-B | Oriental Finl Pfd B | 24.35 | 24.19 | 24.24 | 2,400 | 0.04 | | 0.17 | |
| OFG-D | Oriental Financial Group Inc | 24.70 | 24.70 | 24.70 | 100 | 0.00 |  | 0.00 | |
| OGE | Oge Energy Corp | 40.26 | 39.21 | 39.98 | 1,376,600 | 0.66 | | 1.68 | |
| OGS | One Gas Inc | 77.49 | 75.93 | 77.36 | 194,000 | 1.23 | | 1.62 | |
| OHI | Omega Healthcare Investors | 37.56 | 36.89 | 37.43 | 1,299,300 | 0.54 | | 1.46 | |
| OI | Owens-Illinois | 18.96 | 18.61 | 18.77 | 679,800 | 0.15 | | 0.81 | |
| OIA | Invesco Muni Income Trust | 7.390 | 7.330 | 7.390 | 69,000 | 0.010 | | 0.14 | |
| OIB.C | Oi S.A. | 1.835 | 1.700 | 1.750 | 4,712,000 | 0.050 | | 2.94 | |
| OII | Oceaneering International | 16.11 | 15.66 | 15.79 | 567,800 | -0.02 | | 0.13 | |
| OIS | Oil States International | 17.88 | 17.31 | 17.50 | 481,300 | -0.04 | | 0.23 | |
| OKE | Oneok Inc | 61.08 | 59.61 | 60.96 | 2,653,000 | 1.59 | | 2.68 | |
| OLN | Olin Corp | 22.31 | 21.48 | 21.68 | 1,627,600 | -0.51 | | 2.30 | |
| OLP | One Liberty Properties | 26.20 | 25.60 | 25.97 | 38,800 | 0.36 | | 1.41 | |
| OMA.U | One Madison Group | 10.45 | 10.37 | 10.45 | 7,100 | 0.08 | | 0.77 | |
| OMA.W | One Madison Corp. Warrants | 0.7700 | 0.7500 | 0.7500 | 23,600 | -0.0400 | | 5.06 | |
| OMAD | One Madison Corporation Class A | 10.09 | 10.03 | 10.04 | 1,700 | -0.04 | | 0.40 | |
| OMC | Omnicom Group Inc | 76.36 | 75.71 | 76.11 | 1,177,500 | 0.32 | | 0.42 | |
| OMF | Onemain Holdings Inc | 27.78 | 27.26 | 27.73 | 512,800 | 0.22 | | 0.80 | |
| OMI | Owens & Minor | 7.548 | 7.325 | 7.520 | 1,096,700 | 0.010 | | 0.13 | |
| OMN | Omnova Solutions Inc | 8.140 | 7.750 | 8.100 | 101,300 | 0.200 | | 2.53 | |
| OMP | Oasis Midstream Partners LP | 19.25 | 18.96 | 19.00 | 66,700 | 0.02 | | 0.11 | |
| ONDK | On Deck Capital Inc | 7.240 | 7.080 | 7.170 | 202,600 | 0.080 | | 1.13 | |
| ONE | Onesmart International Education Group | 8.690 | 8.240 | 8.600 | 101,300 | 0.290 | | 3.49 | |
| OOMA | Ooma Inc | 14.91 | 14.32 | 14.82 | 40,300 | 0.48 | | 3.35 | |
| OPP | Rivernorth/Doubleline Strategic | 16.97 | 16.85 | 16.94 | 80,900 | 0.05 | | 0.30 | |
| OPY | Oppenheimer Holdings | 26.98 | 26.21 | 26.97 | 40,300 | 0.58 | | 2.20 | |
| OR | Osisko Gold Royalties Ltd | 9.060 | 8.830 | 8.960 | 453,200 | -0.010 | | 0.11 | |
| ORA | Ormat Technologies | 53.68 | 53.14 | 53.63 | 122,700 | 0.20 | | 0.37 | |
| ORAN | Orange ADR | 15.40 | 15.22 | 15.28 | 578,600 | -0.28 | | 1.80 | |
| ORC | Orchid Island Capital Inc | 6.760 | 6.690 | 6.720 | 361,100 | 0.010 | | 0.15 | |
| ORCL | Oracle Corp | 48.53 | 47.41 | 48.38 | 12,142,100 | 0.20 | | 0.42 | |
| ORI | Old Republic International Corp | 21.33 | 21.04 | 21.30 | 1,007,200 | 0.19 | | 0.90 | |
| ORN | Orion Group Holdings Inc | 5.100 | 4.780 | 4.780 | 100,200 | -0.310 | | 6.09 | |
| OSB | Norbord Inc | 28.09 | 26.66 | 27.09 | 272,900 | -0.90 | | 3.22 | |
| OSG | Overseas Shipholding Group Inc | 2.050 | 1.930 | 2.030 | 230,700 | 0.020 | | 1.00 | |
| OSK | Oshkosh Truck Corp | 67.91 | 66.30 | 67.66 | 366,200 | 0.07 | | 0.10 | |
| OSLE | Oaktree Specialty Lending Corp | 25.34 | 25.13 | 25.20 | 2,900 | 0.41 | | 1.65 | |
| OUT | Outfront Media Inc | 20.57 | 20.15 | 20.25 | 678,900 | -0.11 | | 0.54 | |
| OXM | Oxford Industries | 75.47 | 73.48 | 75.16 | 138,300 | 1.02 | | 1.38 | |
| OXY | Occidental Petroleum Corp | 66.53 | 65.35 | 65.52 | 4,499,600 | -0.06 | | 0.09 | |
| OZM | Och-Ziff Capital Management | 12.37 | 11.74 | 11.85 | 60,300 | -0.13 | | 1.09 | |