| Code | Name | High | Low | Close | Volume | Change |
| OAK | Oaks Hotels & Resorts Ltd | 0.4200 | 0.4050 | 0.4200 | 36,635 | 0.0050 |  | 1.20 |
| OBJ | OBJ Ltd | 0.0310 | 0.0290 | 0.0300 | 20,631,814 | 0.0010 |  | 3.23 |
| OBJO | OBJ Ltd | 0.0200 | 0.0200 | 0.0200 | 200,000 | 0.0000 |  | 0.00 |
| OBL | Oil Basins Ltd | 0.0240 | 0.0240 | 0.0240 | 0 | 0.0000 |  | 0.00 |
| OBLO | Oil Basins Ltd | 0.0010 | 0.0010 | 0.0010 | 0 | 0.0000 |  | 0.00 |
| OBLOA | Oil Basins Ltd | 0.0140 | 0.0140 | 0.0140 | 0 | 0.0000 |  | 0.00 |
| OCE | Ocean Capital Ltd | 0.3500 | 0.3500 | 0.3500 | 0 | 0.0000 |  | 0.00 |
| OCL | Objective Corporation Ltd | 0.3800 | 0.3800 | 0.3800 | 2,500 | 0.0100 |  | 2.70 |
| OCP | Oceania Capital Partners Limited | 2.740 | 2.730 | 2.740 | 77,038 | 0.060 |  | 2.14 |
| OCV | Octaviar Ltd | 0.9900 | 0.9900 | 0.9900 | 0 | 0.0000 |  | 0.00 |
| OCVG | Octaviar Ltd | 74.00 | 74.00 | 74.00 | 0 | 0.00 |  | 0.00 |
| ODG | Odyssey Gaming Ltd | 0.0350 | 0.0350 | 0.0350 | 0 | 0.0000 |  | 0.00 |
| ODN | Odin Energy Ltd | 0.0300 | 0.0300 | 0.0300 | 0 | 0.0000 |  | 0.00 |
| ODNO | Odin Energy Ltd | 0.0020 | 0.0020 | 0.0020 | 0 | 0.0000 |  | 0.00 |
| ODY | Odyssey Energy Ltd | 0.0600 | 0.0600 | 0.0600 | 0 | 0.0000 |  | 0.00 |
| OEC | Orbital Corporation Ltd | 0.0560 | 0.0560 | 0.0560 | 0 | 0.0000 |  | 0.00 |
| OEL | Ottoman Energy Ltd | 0.0690 | 0.0670 | 0.0670 | 1,837,582 | 0.0010 |  | 1.47 |
| OEQ | Orion Equities Ltd | 0.5700 | 0.5700 | 0.5700 | 4,676 | 0.0000 |  | 0.00 |
| OEX | Oilex NL | 0.3400 | 0.3100 | 0.3200 | 2,034,604 | 0.0150 |  | 4.48 |
| OFG | Over Fifty Group Ltd | 0.9600 | 0.9450 | 0.9600 | 7,327 | 0.0150 |  | 1.59 |
| OGC | Oceanagold Corporation | 1.530 | 1.460 | 1.530 | 768,099 | 0.015 |  | 0.99 |
| OGL | Overseas & General Ltd (Malay CUFS) | 0.0750 | 0.0750 | 0.0750 | 0 | 0.0000 |  | 0.00 |
| OHL | Omnitech Holdings Ltd | 0.0010 | 0.0010 | 0.0010 | 0 | 0.0000 |  | 0.00 |
| OIL | Optiscan Imaging Ltd | 0.0970 | 0.0970 | 0.0970 | 41,620 | 0.0010 |  | 1.02 |
| OIP | Orion Petroleum Ltd | 0.1000 | 0.0900 | 0.0900 | 415,000 | 0.0100 |  | 10.00 |
| OIPO | Orion Petroleum Ltd | 0.0100 | 0.0100 | 0.0100 | 350,000 | 0.0000 |  | 0.00 |
| OKJ | Oakajee Corporation Ltd | 0.1300 | 0.1200 | 0.1200 | 130,000 | 0.0000 |  | 0.00 |
| OKN | Oakton Ltd | 3.750 | 3.580 | 3.700 | 40,509 | 0.020 |  | 0.54 |
| OKU | Oklo Uranium Ltd | 0.0650 | 0.0650 | 0.0650 | 73,300 | 0.0000 |  | 0.00 |
| OLE | Olea Australis Ltd | 0.0040 | 0.0040 | 0.0040 | 0 | 0.0000 |  | 0.00 |
| OLH | Oldfields Holdings Ltd | 0.3000 | 0.3000 | 0.3000 | 0 | 0.0000 |  | 0.00 |
| OMH | OM Holdings Ltd | 1.920 | 1.845 | 1.910 | 744,775 | 0.025 |  | 1.33 |
| OMI | Occupational & Medical Innovatns Ltd | 0.1450 | 0.1450 | 0.1450 | 0 | 0.0000 |  | 0.00 |
| ONC | Oncard International Ltd | 0.1700 | 0.1700 | 0.1700 | 22,500 | 0.0000 |  | 0.00 |
| ONQ | On Q Group Ltd | 0.0720 | 0.0720 | 0.0720 | 0 | 0.0000 |  | 0.00 |
| ONT | 1300 Smiles Ltd | 2.650 | 2.650 | 2.650 | 0 | 0.000 |  | 0.00 |
| OOH | Oohmedia Group Ltd | 0.1200 | 0.1200 | 0.1200 | 0 | 0.0000 |  | 0.00 |
| OPI | Optima ICM Ltd | 0.0150 | 0.0150 | 0.0150 | 0 | 0.0000 |  | 0.00 |
| ORC | Orchid Capital Ltd | 0.0140 | 0.0140 | 0.0140 | 0 | 0.0000 |  | 0.00 |
| ORCOA | Orchid Capital Ltd | 0.0010 | 0.0010 | 0.0010 | 0 | 0.0000 |  | 0.00 |
| ORD | Ord River Resources Ltd | 0.0580 | 0.0520 | 0.0570 | 1,400,259 | 0.0070 |  | 14.00 |
| ORDO | Ord River Resources Ltd | 0.0010 | 0.0010 | 0.0010 | 0 | 0.0000 |  | 0.00 |
| ORE | Orocobre Ltd | 1.125 | 1.100 | 1.105 | 172,596 | 0.015 |  | 1.34 |
| ORG | Origin Energy Ltd | 16.09 | 15.92 | 16.00 | 4,187,408 | 0.06 |  | 0.37 |
| ORGKZC | Origin Energy Ltd | 5.600 | 5.600 | 5.600 | 0 | 0.000 |  | 0.00 |
| ORGKZP | Origin Energy Limited | 3.400 | 3.400 | 3.400 | 0 | 0.000 |  | 0.00 |
| ORH | Orient Resource Holdings Ltd | 0.0410 | 0.0410 | 0.0410 | 0 | 0.0000 |  | 0.00 |
| ORI | Orica Ltd | 25.18 | 24.80 | 24.96 | 1,066,989 | 0.30 |  | 1.19 |
| ORIKZI | Orica Ltd | 10.52 | 10.52 | 10.52 | 0 | 0.00 |  | 0.00 |
| ORIKZJ | Orica Ltd | 12.06 | 12.06 | 12.06 | 0 | 0.00 |  | 0.00 |
| ORIMMI | Orica Ltd | 0.3900 | 0.3900 | 0.3900 | 0 | 0.0000 |  | 0.00 |
| ORIPB | Orica Ltd | 92.00 | 91.80 | 91.80 | 610 | 0.69 |  | 0.75 |
| ORL | OrotonGroup Ltd | 6.380 | 6.380 | 6.380 | 3,505 | 0.000 |  | 0.00 |
| ORM | Orion Metals Limited | 0.0900 | 0.0900 | 0.0900 | 30,000 | 0.0000 |  | 0.00 |
| ORN | ORN | 0.0550 | 0.0550 | 0.0550 | 500,000 | 0.0000 |  | 0.00 |
| ORO | Oroya Mining Ltd | 0.0050 | 0.0050 | 0.0050 | 90,000 | 0.0000 |  | 0.00 |
| OROOA | Oroya Mining Ltd | 0.0030 | 0.0030 | 0.0030 | 45,000 | 0.0000 |  | 0.00 |
| ORP | Oropa Ltd | 0.0800 | 0.0740 | 0.0770 | 892,353 | 0.0000 |  | 0.00 |
| ORPO | ORPO | 0.0400 | 0.0400 | 0.0400 | 0 | 0.0000 |  | 0.00 |
| ORPOA | Oropa Ltd | 0.0040 | 0.0040 | 0.0040 | 0 | 0.0000 |  | 0.00 |
| ORT | ORT Ltd | 0.0140 | 0.0140 | 0.0140 | 0 | 0.0000 |  | 0.00 |
| OSH | Oil Search Ltd (PNG) | 5.920 | 5.870 | 5.870 | 4,678,787 | 0.050 |  | 0.84 |
| OSHKZD | Oil Search Ltd (PNG) | 3.060 | 3.060 | 3.060 | 0 | 0.000 |  | 0.00 |
| OSHKZE | Oil Search Ltd (PNG) | 2.370 | 2.370 | 2.370 | 0 | 0.000 |  | 0.00 |
| OSHKZR | Oil Search Ltd (PNG) | 1.610 | 1.610 | 1.610 | 0 | 0.000 |  | 0.00 |
| OSHKZS | Oil Search Ltd (PNG) | 0.7400 | 0.7400 | 0.7400 | 3,000 | 0.1800 |  | 19.57 |
| OST | Onesteel Ltd | 3.050 | 3.010 | 3.040 | 6,462,630 | 0.010 |  | 0.33 |
| OTI | Oriental Technologies Investment Ltd | 0.0600 | 0.0600 | 0.0600 | 0 | 0.0000 |  | 0.00 |
| OUM | OUM | 0.0750 | 0.0750 | 0.0750 | 5,000 | 0.0080 |  | 11.94 |
| OUMO | OUM | 0.0300 | 0.0300 | 0.0300 | 0 | 0.0000 |  | 0.00 |
| OVR | Overland Resources Ltd | 0.1000 | 0.1000 | 0.1000 | 200,000 | 0.0000 |  | 0.00 |
| OXX | Octanex N.l. | 0.4150 | 0.4000 | 0.4050 | 164,000 | 0.0050 |  | 1.22 |
| OXXO | Octanex N.l. | 0.1900 | 0.1900 | 0.1900 | 60,000 | 0.0100 |  | 5.00 |
| OZB | Oz Brewing Ltd | 0.0330 | 0.0330 | 0.0330 | 0 | 0.0000 |  | 0.00 |
| OZBO | Oz Brewing Ltd | 0.0100 | 0.0100 | 0.0100 | 0 | 0.0000 |  | 0.00 |
| OZG | Ozgrowth Ltd | 0.1600 | 0.1600 | 0.1600 | 0 | 0.0000 |  | 0.00 |
| OZL | OZ Minerals | 1.280 | 1.260 | 1.270 | 10,418,463 | 0.020 |  | 1.55 |