| OAK-A | Oaktree Cap Group Llc [Oak/Pa] | 21.15 | 21.00 | 21.10 | 1.1K | 0.10 | | 0.48 | |
| OCA.U | Omnichannel Acquisition Corp | 10.27 | 10.26 | 10.27 | 3.1K | 0.02 | | 0.20 | |
| OHI | Omega Healthcare Investors | 48.46 | 47.68 | 47.86 | 760.0K | -0.44 | | 0.91 | |
| OIA | Invesco Muni Income Trust | 6.280 | 6.210 | 6.250 | 94.7K | 0.030 | | 0.48 | |
| OII | Oceaneering International | 44.00 | 41.92 | 42.83 | 455.7K | -0.44 | | 1.02 | |
| OPP-A | Rivernorth/Doubleline Strategic | 16.22 | 16.14 | 16.20 | 5.1K | 0.02 | | 0.15 | |
| OPP-B | Rivernorth/Doubleline Strategic | 17.53 | 17.39 | 17.39 | 4.4K | -0.23 | | 1.28 | |
| OPTU | Optimum Communications Inc | 1.1100 | 0.9097 | 0.9400 | 5.52M | -0.0600 | | 6.00 | |
| ORC | Orchid Island Capital Inc | 6.990 | 6.840 | 6.925 | 4.01M | 0.105 | | 1.54 | |
| ORI | Old Republic International Corp | 40.90 | 40.16 | 40.30 | 444.2K | -1.09 | | 2.62 | |
| OSG | Overseas Shipholding Group Inc | 6.175 | 5.790 | 5.830 | 232.9K | -0.290 | | 4.74 | |
| OTA.U | Starlink AI Acquisition Corporation | 10.15 | 10.06 | 10.11 | 8.8K | -0.01 | | 0.10 | |
| OTAI | Starlink AI Acquisition Corp. | 10.000 | 9.925 | 9.945 | 22.2K | 0.005 | | 0.05 | |
| OTF | Blue Owl Technology Finance Corp | 10.58 | 10.25 | 10.38 | 1.7M | 0.11 | | 1.02 | |
| OXY | Occidental Petroleum Corp | 54.78 | 52.95 | 53.77 | 4.82M | -0.82 | | 1.50 | |
| OXY.W | Occidental Petroleum Corp WT [Oxy/W/I] | 33.29 | 31.93 | 32.63 | 35.6K | -0.21 | | 0.64 | |