| Code | Name | High | Low | Close | Volume | Change | |
|---|
| O | Realty Income Corp | 55.84 | 55.24 | 55.49 | 1,592,700 | -0.32 |  | 0.57 |   |
| OAK | Oaktree Capital Group Llc | 41.95 | 41.50 | 41.65 | 169,500 | 0.05 |  | 0.12 | |
| OAK-A | Oaktree Cap Group Llc Series A Pfd | 25.64 | 25.41 | 25.54 | 1,002,700 | 0.12 | | 0.47 | |
| OAS | Oasis Petroleum Inc | 12.22 | 12.02 | 12.08 | 5,240,500 | 0.00 |  | 0.00 | |
| OBE | Obsidian Energy Ltd | 1.070 | 1.040 | 1.040 | 718,900 | -0.010 | | 0.95 | |
| OC | Owens Corning Inc | 66.87 | 65.97 | 66.10 | 1,236,400 | -0.79 | | 1.18 | |
| OCIP | Oci Partners LP | 11.55 | 11.45 | 11.45 | 12,900 | -0.05 | | 0.43 | |
| OCN | Ocwen Financial Corp | 4.460 | 4.395 | 4.420 | 583,700 | 0.030 | | 0.68 | |
| ODC | Oil-Dri Corporation of America | 45.70 | 44.25 | 45.16 | 6,600 | 0.02 | | 0.04 | |
| OEC | Orion Engineered Carbons S.A R | 32.40 | 31.95 | 32.30 | 213,900 | 0.35 | | 1.10 | |
| OFC | Corporate Office Properties | 29.49 | 29.14 | 29.18 | 1,156,800 | -0.18 | | 0.61 | |
| OFG | Oriental Financial Group | 16.00 | 14.95 | 15.90 | 660,300 | 1.30 | | 8.90 | |
| OFG-A | Oriental Fin Mips A | 24.73 | 24.25 | 24.27 | 6,100 | -0.04 | | 0.16 | |
| OFG-B | Oriental Finl Pfd B | 24.11 | 23.96 | 23.96 | 1,800 | 0.05 | | 0.21 | |
| OFG-D | Oriental Financial Group Inc | 24.47 | 24.20 | 24.38 | 17,000 | -0.02 | | 0.09 | |
| OGE | Oge Energy Corp | 36.13 | 35.54 | 35.79 | 1,062,000 | -0.34 | | 0.94 | |
| OGS | One Gas Inc | 76.68 | 75.67 | 76.13 | 123,100 | -0.47 | | 0.61 | |
| OHI | Omega Healthcare Investors | 30.99 | 30.46 | 30.49 | 1,438,700 | -0.45 | | 1.45 | |
| OI | Owens-Illinois | 16.83 | 16.55 | 16.59 | 1,329,000 | -0.24 | | 1.43 | |
| OIA | Invesco Muni Income Trust | 7.630 | 7.590 | 7.620 | 53,500 | 0.030 | | 0.40 | |
| OIB.C | Oi S.A. | 4.730 | 4.680 | 4.720 | 700 | 0.110 | | 2.39 | |
| OII | Oceaneering International | 26.89 | 26.06 | 26.48 | 1,001,600 | -0.37 | | 1.38 | |
| OIS | Oil States International | 33.70 | 33.15 | 33.35 | 312,400 | 0.10 | | 0.30 | |
| OKE | Oneok Inc | 70.77 | 69.71 | 69.93 | 2,109,600 | -0.51 | | 0.72 | |
| OLN | Olin Corp | 29.18 | 28.66 | 28.80 | 1,541,700 | -0.24 | | 0.83 | |
| OLP | One Liberty Properties | 27.83 | 27.09 | 27.12 | 65,200 | -0.71 | | 2.55 | |
| OMA.U | One Madison Group | 10.33 | 10.27 | 10.27 | 15,800 | -0.05 | | 0.48 | |
| OMA.W | One Madison Corp. Warrants | 1.140 | 1.140 | 1.140 | 1,000 | -0.010 | | 0.87 | |
| OMAD | One Madison Corporation Class A | 9.770 | 9.770 | 9.770 | 200 | 0.020 | | 0.21 | |
| OMC | Omnicom Group Inc | 69.56 | 68.05 | 68.18 | 5,358,700 | -1.43 | | 2.05 | |
| OMF | Onemain Holdings Inc | 34.75 | 34.15 | 34.37 | 404,800 | 0.04 | | 0.12 | |
| OMI | Owens & Minor | 17.64 | 17.26 | 17.45 | 535,900 | -0.03 | | 0.17 | |
| OMN | Omnova Solutions Inc | 9.550 | 9.150 | 9.250 | 115,100 | -0.350 | | 3.65 | |
| OMP | Oasis Midstream Partners LP | 19.68 | 19.26 | 19.50 | 10,400 | -0.13 | | 0.66 | |
| ONDK | On Deck Capital Inc | 7.800 | 7.555 | 7.610 | 311,300 | -0.080 | | 1.04 | |
| ONE | Onesmart International Education Group | 11.52 | 11.17 | 11.24 | 219,100 | 0.00 | | 0.00 | |
| OOMA | Ooma Inc | 16.25 | 15.80 | 15.90 | 37,000 | 0.05 | | 0.32 | |
| OPP | Rivernorth/Doubleline Strategic | 17.43 | 17.27 | 17.40 | 42,000 | 0.07 | | 0.40 | |
| OPY | Oppenheimer Holdings | 28.30 | 27.91 | 28.10 | 23,000 | 0.00 | | 0.00 | |
| OR | Osisko Gold Royalties Ltd | 9.600 | 9.505 | 9.590 | 422,500 | 0.110 | | 1.16 | |
| ORA | Ormat Technologies | 52.19 | 51.48 | 51.75 | 95,600 | -0.32 | | 0.61 | |
| ORAN | Orange ADR | 16.56 | 16.40 | 16.53 | 205,100 | 0.15 | | 0.92 | |
| ORC | Orchid Island Capital Inc | 8.150 | 8.030 | 8.040 | 745,600 | -0.080 | | 0.99 | |
| ORCL | Oracle Corp | 48.71 | 48.36 | 48.52 | 17,236,200 | 0.08 | | 0.17 | |
| ORI | Old Republic International Corp | 20.49 | 20.16 | 20.44 | 1,527,300 | 0.16 | | 0.79 | |
| ORN | Orion Group Holdings Inc | 9.330 | 9.030 | 9.080 | 223,200 | -0.200 | | 2.16 | |
| OSB | Norbord Inc | 38.99 | 37.71 | 37.87 | 112,800 | -0.63 | | 1.64 | |
| OSG | Overseas Shipholding Group Inc | 3.590 | 3.510 | 3.530 | 370,400 | -0.040 | | 1.12 | |
| OSK | Oshkosh Truck Corp | 74.44 | 73.58 | 73.98 | 666,400 | -0.19 | | 0.26 | |
| OSLE | Oaktree Specialty Lending Corp | 25.56 | 25.24 | 25.38 | 5,300 | -0.26 | | 1.01 | |
| OUT | Outfront Media Inc | 21.11 | 20.89 | 20.97 | 942,000 | -0.15 | | 0.71 | |
| OXM | Oxford Industries | 93.25 | 92.23 | 93.00 | 178,900 | 0.27 | | 0.29 | |
| OXY | Occidental Petroleum Corp | 83.34 | 82.48 | 83.08 | 3,147,100 | 0.10 | | 0.12 | |
| OZM | Och-Ziff Capital Management | 2.090 | 2.040 | 2.060 | 82,400 | -0.030 | | 1.44 | |