| OAK-A | Oaktree Cap Group Llc [Oak/Pa] | 21.82 | 21.66 | 21.67 | 10.4K | -0.03 | | 0.14 | |
| OAK-B | Brookfield Oaktree Holdings Llc [Oak/Pb] | 21.46 | 21.34 | 21.40 | 5.8K | 0.03 | | 0.14 | |
| OHI | Omega Healthcare Investors | 44.22 | 43.63 | 44.01 | 812.0K | 0.30 | | 0.69 | |
| OIA | Invesco Muni Income Trust | 6.210 | 6.150 | 6.170 | 104.6K | -0.040 | | 0.64 | |
| OII | Oceaneering International | 29.95 | 28.89 | 29.09 | 798.0K | -0.08 | | 0.27 | |
| OPP-A | Rivernorth/Doubleline Strategic | 17.15 | 17.03 | 17.03 | 9.5K | -0.07 | | 0.41 | |
| OPP-B | Rivernorth/Doubleline Strategic | 18.97 | 18.94 | 18.94 | 2.8K | -0.03 | | 0.16 | |
| OPTU | Optimum Communications Inc | 1.810 | 1.690 | 1.700 | 1.53M | -0.090 | | 5.00 | |
| ORC | Orchid Island Capital Inc | 8.220 | 8.200 | 8.200 | 428 | 0.030 | | 0.37 | |
| ORI | Old Republic International Corp | 39.20 | 37.60 | 38.74 | 1.25M | 0.80 | | 2.11 | |
| OSG | Overseas Shipholding Group Inc | 6.200 | 6.040 | 6.115 | 474.1K | 0.040 | | 0.66 | |
| OTF | Blue Owl Technology Finance Corp | 14.13 | 13.44 | 13.55 | 1.3M | -0.25 | | 1.81 | |
| OXY | Occidental Petroleum Corp | 44.03 | 43.85 | 44.01 | 2.8K | 0.09 | | 0.19 | |
| OXY.W | Occidental Petroleum Corp WT [Oxy/W/I] | 22.69 | 21.77 | 22.01 | 131.2K | -0.16 | | 0.72 | |