State-run Coal India and drug-maker Sun Pharma, which entered the coveted league of 30 Sensex companies on Monday, tumbled on the bourses amid the overall bearish broader market trend following the U.S. credit ratings downgrade.

Shares of Coal India opened the day on a weak note and were trading down by 1.58 per cent at Rs. 386.15 on the BSE.

The stock touched an intra-day low of Rs. 378.40 and a high of Rs. 387.85.

Similarly, Sun Pharma made a sluggish start and fell by 1.94 per cent to trade at Rs. 488.05 on the BSE. The scrip hit an intra-day low of Rs. 484.55 and a high of Rs. 494.40.

The entry of the two new companies into the Sensex pack ends the over five-year journey of Anil Ambani group firms Reliance Communications (RCom) and Reliance Infra (R-Infra).

RCom and R-Infra ended their Sensex journey on Friday on a disappointing note, with their shares falling by over 7 per cent.

Shares of RCom were trading lower by 5.32 per cent at Rs 87.20 on Monday, while R-Infra went down by 3.54 per cent to Rs. 505.25.

The 30 stocks currently listed on the Sensex include Reliance Industries, four Tata Group companies — TCS, Tata Steel, Tata Power and Tata Motors — and two from Deepak Parekh-led HDFC Group, namely HDFC and HDFC Bank.

PSUs like ONGC, NTPC, SBI and BHEL; IT firms TCS, Infosys and Wipro; auto-makers Maruti, Hero Honda, M&M and Bajaj Auto; banking major ICICI Bank; and firms like Bharti Airtel, ITC, L&T, HUL, Jindal Steel, Hindalco, Sterlite Industries, Cipla, DLF and Jaiprakash Associates are the other companies listed on the Sensex.