Sensex constituents such as L&T, SBI, TCS, NTPC, ONGC, GAIL, Coal India, Tata Steel, BHEL and Tata Power suffered losses. ICICI Bank, Tata Motors, Sun Pharma, Wipro, M&M and Sesa Sterlite notched up gains, cushioning the index's drop.
Small-cap and mid-cap indices continued their decline on sustained selling by retail investors, underperforming Sensex.
Caution prevailed in markets as traders were busy carrying forward their positions to April 2015 series as the March contract is set to expire tomorrow.
The broad-based 50-issue NSE Nifty also moved down further by 12.15 points, or 0.14 per cent, to 8,530.80.
"In absence of any major cues, equity benchmarks upheld their prevailing consolidation bias and closed almost unchanged on Wednesday. Adding negativity to dampened sentiments, stocks have been extremely volatility ahead of F&O expiry," said Jayant Manglik, President-retail distribution, Religare Securities.