The banking index ended 2.9 percent lower on reports pointing to a probe into loans issued by some financial institutions, adding to investor nervousness.
After market hours, the CBI arrested eight top officials from banks and financial firms on charges of taking bribes to grant corporate loans.
Shares in microlender SKS Microfinance rose 5.75 percent to close at 714.45 rupees on Monday.
Shares took a beating on Thursday and fell 20 percent after the lender said the new regulations could squeeze profit and revenue. However, SKS on Friday said its balance sheet was healthy.
The BSE Metals index gained 1.9 percent on Thursday, with stocks like Hindalco and JSW Steel posting top gains.
Hindalco shares closed 4.8 percent higher at 222.35 rupees, JSW Steel gained 3.5 percent. Jindal Steel and Power ended down 1.8 percent as the top sectoral loser.
It was a tough day for those who invest in real estate stocks as the BSE Realty index fell 4.76 percent on Friday, in a Mumbai market that fell more than 400 points.
Sobha Developers was worst hit in the sector, ending down 6 percent. Unitech shares fell 5.9 percent, while DLF slipped 5.46 percent.
Shares in Coal India rose 1.8 percent on Thursday to close at 328.45 rupees.
The company, which is the world’s largest coal miner, may miss the current fiscal year’s 460.5 million tonnes production target, its technical director said on Wednesday.
The government recently raised about 152 billion rupees through the sale of some of its holding in Coal India.
Shares in Power Grid, the world’s third-largest power transmission company, rose more than 5 percent to 103.75 rupees on Tuesday.
The company’s share sale (FPO) worth up to $1.7 billion was fully covered on its first day as investors sought what is seen as relatively safe exposure to surging electricity demand in the country.
The BSE Banking index rose 3.38 percent on Monday, with India’s top private bank, ICICI, posting smart gains.
IndusInd Bank ended as the top sectoral gainer, adding more than 8 percent, while ICICI Bank ended nearly6 percent higher at 1231 rupees.