Mumbai, Feb 26: Extending gains for the fourth trading session in a row, the benchmark S&P BSE Sensex today breached 21K-mark after one month but failed to close above that level, still closing up by about 135 points at 20,986.99, despite mixed global cues.

Brokers attributed the rally in share values to short coverings by operators on the last day of expiry February contract.

Overall, 10 out of 12 sectoral indices closed in the green while 22 out of 30 sensex-based scrips finished with gains.

Sensex heavyweight and cigarette major, ITC, was the major contributer to the index gains and was the second biggest gainer from the sensex pack with a rise of 2.07 pct.

Smart rise in HDFC, Infosys M&M, L&T and Sun Pharma also supported the sensex surge.

The Bombay Stock Exchange 30-share barometer resumed almost stable and remained in positive terrain throughout the day to touch an intra-day high of 21,005.04 before settling at 20,986.99, revealing a rise of 134.52 points or 0.65 pct.

In straight four sessions, it has spurted by 450.35 points or 2.19 pct. Previously, it has touched an intra-trade high of 21,333.66 on January 24, 2014.

The NSE 50-issue CNX Nifty also improved further by 38.75 points or 0.62 pct to 6,238.80.

Meanwhile, Foreign institutional investors (FIIs) bought shares worth a net Rs 423.41 crs yesterday as per provisional data from the stock exchanges. PTI