The stock settled the day with gains of 1.77 per cent at Rs 307.20 on NSE while on BSE, it climbed 1.72 per cent to close at Rs 307.
During the day, the stock rose as much as Rs 312 on NSE, up 3.37 per cent. On BSE, the stock recorded an intra-day high of Rs 310.90, an increase of 3.01 per cent.
NMDC shares, on the other hand, fell 1.37 per cent to close at Rs 93.45 on NSE. On BSE, it closed at Rs 93.60, a drop of 1.58 per cent.
"These changes shall become effective September 28, 2015 (close of September 24, 2015)," it had said.
In the broader market, the benchmark BSE Sensex ended at 25,616.84 points, down 0.95 per cent, or 246.66 points.