Eight of the top-10 most valued firms lost a combined ₹2,24,630.45 crore in market value last week.
Reliance Industries and HDFC Bank recorded the biggest declines.
The BSE benchmark index fell 1,497.2 points, or 1.84%, during the week.
Reliance Industries’ market cap fell ₹70,707.17 crore to ₹18,36,424.20 crore.