State Bank of India shed roughly Rs 45,000 crore in market capitalisation on Monday, making it the biggest loser on the Nifty 50 index after the country's largest public-sector bank reported weaker-than-expected results for the fourth quarter.

SBI's share price came under sharp selling pressure as investors reacted to the Q4 earnings, which disappointed on key metrics. A large single-session drop of this scale in market cap reflects how sensitive bank stocks are to quarterly profit and asset-quality signals, particularly when a lender of SBI's size misses expectations.

Other Blue-Chips Also Hit

SBI was not alone in dragging the index lower. Bharti Airtel, Tata Consultancy Services, and Larsen & Toubro also saw their valuations erode during the session, adding to broader pressure on large-cap stocks.

TCS, as India's largest IT exporter, and L&T, a bellwether for infrastructure and engineering orders, are both closely watched for macro signals. Their simultaneous decline alongside SBI and Airtel suggests the selling was spread across sectors rather than confined to banking alone.

What This Means for Markets

A Rs 45,000 crore single-day market-cap loss at SBI is significant because the bank is one of the heaviest-weighted stocks in the Nifty 50 and the broader BSE indices. Moves of this size can pull index levels down and affect passive funds that track these benchmarks.

For SBI specifically, weak quarterly numbers can also shift near-term sentiment around the broader public-sector banking space, since investors often use SBI's results as a read-through for government-owned lenders more generally.

The detail on exactly which metrics disappointed, net interest income, net interest margin, slippages, or net profit, was not available in the source material, so the precise driver of the selloff remains to be confirmed from SBI's full earnings disclosure.

Watch for analyst target-price revisions on SBI in the coming days, and whether the stock stabilises or continues to face selling pressure as the earnings details are digested by institutional investors.