| OAL | Oriental Aromatics Limited | 555.6 | 531.0 | 532.3 | 26.5K | -26.1 | | 4.67 | |
| OBCL | Orissa Bengal Carrier Limited | 60.49 | 58.10 | 59.42 | 16.9K | -0.85 | | 1.41 | |
| OBEROIRLTY | Oberoi Realty Limited | 1,875 | 1,815 | 1,838 | 468.8K | -13 | | 0.68 | |
| OBEROIRLTY.BL | OBEROI REALTY LTD | 0.0000 | 0.0000 | 0.0000 | 0 | 0.0000 | | NaN | |
| OCCLLTD | OCCL Limited | 160.3 | 152.4 | 159.7 | 59.4K | 4.5 | | 2.91 | |
| ODIGMA | ODIGMA CONSULTANCY SOLUTIONS LTD | 21.11 | 20.75 | 20.96 | 6.1K | -0.14 | | 0.66 | |
| ODYCORP | ODYCORP | 0.0000 | 0.0000 | 0.0000 | 0 | 0.0000 | | NaN | |
| OFSS | Oracle Financial Services | 10,995 | 10,600 | 10,925 | 142.5K | 76 | | 0.70 | |
| OIL | Oil India Limited | 479.0 | 469.2 | 479.0 | 1.49M | 9.0 | | 1.91 | |
| OILCOUNTUB | Oil Country Tubular Limited | 70.89 | 69.10 | 70.89 | 39.5K | 1.39 | | 2.00 | |
| OILCOUNTUB.BL | OILCOUNTUB.BL | 0.0000 | 0.0000 | 0.0000 | 0 | 0.0000 | | NaN | |
| OILIETF | OILIETF | 11.15 | 11.01 | 11.02 | 481.4K | -0.13 | | 1.17 | |
| OLAELEC | Ola Electric Mobility Ltd | 44.55 | 40.91 | 42.52 | 376.02M | 0.65 | | 1.55 | |
| OLECTRA | Olectra Greentech Limited | 1,273 | 1,240 | 1,244 | 349.6K | -32 | | 2.50 | |
| OMAXAUTO | Omax Autos Limited | 217.2 | 196.3 | 201.6 | 278.7K | -8.3 | | 3.96 | |
| OMAXE | Omaxe Limited | 123.8 | 116.9 | 117.7 | 596.0K | -5.5 | | 4.43 | |
| OMFREIGHT | Om Freight Forwarders Limited | 92.95 | 88.26 | 91.83 | 13.6K | -0.43 | | 0.47 | |
| OMFURN-SM | OMFURN-SM | 53.00 | 52.95 | 52.95 | 2.4K | -1.00 | | 1.85 | |
| OMINFRAL | OM INFRA LIMITED | 79.59 | 78.05 | 78.45 | 33.4K | 0.11 | | 0.14 | |
| OMNI | Omnitech Engineering Limited | 556.2 | 545.1 | 547.9 | 356.1K | -5.9 | | 1.06 | |
| OMPOWER | Om Power Transmission Limited | 171.0 | 165.1 | 166.0 | 28.1K | -4.4 | | 2.56 | |
| ONEGLOBAL | ONEGLOBAL | 0.0000 | 0.0000 | 0.0000 | 0 | 0.0000 | | NaN | |
| ONELIFECAP | Onelife Capital Advisors Limited | 36.00 | 34.50 | 35.81 | 87.3K | 0.72 | | 2.05 | |
| ONEPOINT | One Point One Solutions Limited | 72.40 | 68.41 | 69.31 | 5.43M | 0.90 | | 1.32 | |
| ONESOURCE | ONESOURCE SPECIALTY PHARMA LTD | 1,605 | 1,579 | 1,595 | 104.9K | -2 | | 0.13 | |
| ONGC | Oil & Natural Gas Corporation Limited | 239.0 | 235.2 | 239.0 | 8.49M | 2.1 | | 0.89 | |
| ONGC.BL | ONGC.BL | 0.0000 | 0.0000 | 0.0000 | 0 | 0.0000 | | NaN | |
| ONIDA | Onida Electronics Limited | 34.63 | 33.16 | 33.28 | 209.0K | -1.02 | | 2.97 | |
| ONIXSOLAR | Onix Solar Energy Ltd. | 0.0000 | 0.0000 | 0.0000 | 0 | 0.0000 | | NaN | |
| ONMOBILE | OnMobile Global Limited | 53.80 | 50.50 | 52.42 | 47.6K | 0.33 | | 0.63 | |
| ONWARDTEC | Onward Technologies Limited | 291.4 | 284.9 | 287.3 | 15.2K | -6.8 | | 2.30 | |
| ONYX-SM | ONYX-SM | 36.00 | 36.00 | 36.00 | 4.0K | -0.10 | | 0.28 | |
| OPTIEMUS | Optiemus Infracom Limited | 820.0 | 771.0 | 781.5 | 1.6M | -46.9 | | 5.66 | |
| OPTIFIN | OPTIFIN | 0.0000 | 0.0000 | 0.0000 | 0 | 0.0000 | | NaN | |
| OPTIMYSTIX.SM | Optimystix Entertainment India Limited | 0.0000 | 0.0000 | 0.0000 | 0 | 0.0000 | | NaN | |
| ORBTEXP | Orbit Exports Limited | 234.9 | 225.5 | 227.0 | 234 | -1.4 | | 0.60 | |
| ORCHASP | Orchasp Limited | 1.400 | 1.350 | 1.350 | 80.9K | -0.020 | | 1.46 | |
| ORCHPHARMA | Orchid Pharma Limited | 1,141 | 1,088 | 1,096 | 139.3K | -6 | | 0.54 | |
| ORIANA | ORIANA | 315.0 | 301.0 | 303.7 | 329.6K | -4.6 | | 1.49 | |
| ORIANA-SM | ORIANA POWER LTD | 315.0 | 301.0 | 303.7 | 329.6K | -4.6 | | 1.49 | |
| ORICONENT | Oricon Enterprises Limited | 54.37 | 51.20 | 51.77 | 21.1K | -2.07 | | 3.84 | |
| ORIENTALTL | Oriental Trimex Limited | 5.040 | 4.920 | 4.960 | 56.8K | 0.000 | | 0.00 | |
| ORIENTBELL | Orient Bell Limited | 393.7 | 387.6 | 391.1 | 8.8K | -0.5 | | 0.11 | |
| ORIENTCEM | Orient Cement Limited | 124.7 | 122.0 | 122.3 | 330.2K | -2.6 | | 2.06 | |
| ORIENTCER | Orient Ceratech Limited | 47.99 | 45.50 | 46.83 | 82.0K | -0.87 | | 1.82 | |
| ORIENTELEC | Orient Electric Limited | 168.0 | 163.3 | 164.0 | 132.5K | -4.1 | | 2.44 | |
| ORIENTHOT | Oriental Hotels Limited | 144.3 | 139.2 | 140.4 | 422.9K | -3.2 | | 2.21 | |
| ORIENTLTD | Orient Press Limited | 79.50 | 79.10 | 79.50 | 152 | -0.69 | | 0.86 | |
| ORIENTPPR | Orient Paper & Industries Limited | 17.04 | 16.70 | 16.80 | 136.3K | -0.10 | | 0.59 | |
| ORIENTTECH | Orient Technologies Limited | 244.0 | 234.1 | 235.2 | 130.7K | -2.9 | | 1.20 | |
| ORIRAIL | Oriental Rail Infrastructure Ltd. | 0.0000 | 0.0000 | 0.0000 | 0 | 0.0000 | | NaN | |
| ORISSAMINE | The Orissa Minerals Development | 3,830 | 3,701 | 3,717 | 9.4K | -124 | | 3.24 | |
| ORKLAINDIA | Orkla India Ltd | 562.8 | 543.0 | 546.0 | 90.9K | -11.5 | | 2.06 | |
| ORTEL | Ortel Communications Limited | 1.740 | 1.700 | 1.740 | 2.8K | -0.020 | | 1.14 | |
| ORTINGLOBE | Ortin Global Limited | 15.30 | 14.63 | 14.75 | 6.1K | -0.35 | | 2.32 | |
| OSELDEVICE.ST | OSEL DEVICES LIMITED | 0.0000 | 0.0000 | 0.0000 | 0 | 0.0000 | | NaN | |
| OSIAHYPER | Osia Hyper Retail Limited | 2.240 | 2.150 | 2.210 | 178.8K | 0.010 | | 0.45 | |
| OSWALAGRO | Oswal Agro Mills Limited | 34.99 | 33.81 | 33.88 | 21.2K | -1.08 | | 3.09 | |
| OSWALGREEN | Oswal Greentech Limited | 20.26 | 19.86 | 19.90 | 37.8K | -0.30 | | 1.49 | |
| OSWALPUMPS | Oswal Pumps Limited | 286.0 | 278.0 | 280.3 | 384.8K | -4.0 | | 1.41 | |
| OSWALSEEDS | ShreeOswal Seeds And Chemicals Limited | 13.75 | 12.55 | 12.68 | 445.2K | -0.89 | | 6.56 | |
| OWAIS | Owais Metal and Mineral Processing Ltd | 77.10 | 74.10 | 74.10 | 5.7K | -1.50 | | 1.98 | |