| OCA.U | Omnichannel Acquisition Corp | 10.23 | 10.22 | 10.22 | 300 | -0.04 | | 0.38 | |
| OCA.W | Omnichannel Acquisition Corp WT | 0.0301 | 0.0301 | 0.0301 | 2.0K | -0.0050 | | 14.25 | |
| OHI | Omega Healthcare Investors | 49.20 | 47.66 | 48.70 | 1.25M | 1.17 | | 2.46 | |
| OIA | Invesco Muni Income Trust | 5.810 | 5.730 | 5.810 | 84.2K | 0.070 | | 1.22 | |
| OII | Oceaneering International | 37.92 | 36.20 | 36.44 | 410.7K | -1.73 | | 4.53 | |
| OPP | Doubleline Strategic Opportunity Fund | 7.107 | 7.030 | 7.075 | 45.7K | 0.055 | | 0.78 | |
| OPP-A | Rivernorth/Doubleline Strategic | 14.52 | 14.31 | 14.49 | 6.7K | -0.06 | | 0.41 | |
| OPP-B | Rivernorth/Doubleline Strategic | 15.75 | 15.58 | 15.58 | 6.6K | -0.16 | | 1.05 | |
| OPTU | Optimum Communications Inc | 0.7204 | 0.6732 | 0.7100 | 2.77M | 0.0350 | | 5.19 | |
| ORC | Orchid Island Capital Inc | 5.075 | 4.870 | 4.925 | 5.32M | 0.135 | | 2.82 | |
| ORI | Old Republic International Corp | 39.75 | 39.05 | 39.74 | 870.6K | 0.96 | | 2.48 | |
| OSG | Overseas Shipholding Group Inc | 5.400 | 5.055 | 5.160 | 299.1K | 0.150 | | 2.99 | |
| OTA.U | Starlink AI Acquisition Corporation | 10.39 | 10.35 | 10.35 | 10.3K | -0.02 | | 0.15 | |
| OTAI | Starlink AI Acquisition Corp. | 10.08 | 10.07 | 10.08 | 2.9K | 0.00 | | 0.01 | |
| OTF | Blue Owl Technology Finance Corp | 10.020 | 9.690 | 9.735 | 2.33M | 0.105 | | 1.09 | |
| OXY | Occidental Petroleum Corp | 59.35 | 56.48 | 57.21 | 6.87M | -3.23 | | 5.34 | |
| OXY.W | Occidental Petroleum Corp WT [Oxy/W/I] | 38.74 | 37.85 | 38.36 | 24.6K | -0.27 | | 0.70 | |