The combined market capitalisation (m-cap) of top seven Sensex companies declined Rs 45,013 crore last week, led by state-owned Coal India which saw the biggest drop in value.
CIL's value eroded by Rs 13,612 crore and stood at Rs 2,08,187 crore on Friday.
After CIL, country's largest lender State Bank of India took the biggest hit of Rs 8,728 crore, taking its m-cap to Rs 1,26,593 crore.
FMCG major ITC lost Rs 6,763 crore and its value fell to Rs 1,86,156 crore, while NTPC shed Rs 6,225 crore from its value to Rs 1,27,722 crore.
RIL's m-cap dropped Rs 4,404 crore to Rs 2,37,879 crore.
Similarly, ONGC's value slipped by Rs 3,722 crore to Rs 2,22,014 crore, while HDFC Bank lost Rs 1,559 crore to Rs 1,25,794 crore.
In contrast, TCS, Infosys and Bharti Airtel saw rise in their valuations.
TCS m-cap surged Rs 14,709 crore to Rs 2,50,152 crore, while Infosys added Rs 2,547 crore to reach Rs 1,40,178 crore.
Bharti Airtel's m-cap gained Rs 2,031 crore to Rs 1,18,615 crore.
Last week, country's largest software exporter TCS replaced Mukesh Ambani-led Reliance Industries as the country's most valued company.
ONGC was at the third place, followed by CIL, ITC, Infosys, SBI, NTPC, HDFC Bank and Bharti.
Meanwhile, in the broader market, the BSE benchmark Sensex fell 1.76% to end the week below the 17k mark at Rs 16,831.08.