A quiet but significant shift has taken place at the top of India’s most watched equity index. ICICI Bank has moved up to become the second-biggest stock in the Nifty 50 index, pushing Reliance Industries down a spot. Even though RIL is still India’s most valuable company, its lower number of shares available for trading means it now has less influence on the index than ICICI Bank. The development is a direct reflection of how the Nifty 50’s free-float methodology works and how diverging promoter holding structures between a bank and a conglomerate can produce this kind of ranking inversion.
HDFC Bank is at 10.96%, ICICI Bank is at 8.39%, and Reliance Industries is at 8.06% in the Nifty 50 weightage breakdown at the top as of June 9, 2026. Passive fund managers and index-tracking investors will need to take this into consideration when balancing their portfolios, as HDFC Bank still holds the top spot with ease while the second and third positions are now changing hands.
“ICICI Bank overtakes Reliance Industries to become the second-largest weighted stock in Nifty 50 despite having a smaller total market cap. The shift is driven by ICICI Bank’s higher free-float market capitalisation relative to RIL’s promoter-heavy ownership structure.”~ET NOW
The Free-Float Mechanic: Why Total Market Cap Does Not Tell The Whole Story
Reliance Industries has the highest overall market capitalisation at almost ₹17.14 lakh crore on the NSE and its free-float market capitalisation is just over ₹8.52 lakh crore. The company now has a weightage of 8.27% in the Nifty 50 index. Compare that with ICICI Bank, which has a total market capitalisation of more than ₹9.09 lakh crore, with its free-float market capitalisation at ₹9.05 lakh crore on the NSE higher than Reliance Industries’ free-float value.
The gap explains everything. Reliance Industries has a highly concentrated promoter ownership structure, with the Ambani family holding a considerable share that is not publicly traded. The promoter-held shares are eliminated from the free-float calculation. In contrast, ICICI Bank has an ownership structure in which practically all of its market capitalization is freely tradeable, as there is no dominating promoter group with a big locked-in position.
The Nifty 50 Index is calculated using the free-float market capitalisation method. It is made up of 50 companies from the Nifty 100 universe based on free-float market capitalisation and liquidity criteria. This methodology was designed specifically to ensure that index weightings reflect the actual investable market not the theoretical total value of a company including shares that ordinary investors can never buy.
“ICICI Bank overtakes Reliance Industries as the second-largest weighted stock in Nifty 50, with HDFC Bank leading. ICICI’s strong growth in free float market cap contrasts Reliance’s lower weight due to significant promoter holdings.”~Groww
What Has Been Driving ICICI Bank’s Rise And Reliance’s Pressure:
The ranking inversion was not caused by a single spectacular event; rather, it is the outcome of divergent stock performance and market cap trajectories over several months. ICICI Bank has been a notable performer in the Indian banking market through FY26, thanks to consistently good quarterly earnings, improved asset quality measures, and a retail banking franchise that has progressively increased its share of deposits and retail credit.
Reliance Industries shares dropped for the ninth consecutive day at one point this year, hitting a 52-week low of ₹1,270.6, eroding ₹1.29 lakh crore in market cap. Factors include rising crude prices, margin pressures, weak earnings, and bearish technical indicators. The company’s core refining and petrochemicals business has faced global headwinds from volatile crude pricing and compressed refining margins, while its retail and telecom segments though growing have not yet fully offset the pressure from the core energy business in terms of market perception.
Axis Bank’s Q4 FY26 results offered a useful comparison point for the sector: private sector banks have broadly delivered strong earnings, reinforcing the thesis that financial sector stocks should command rising index weights relative to energy and commodity-linked names in the current environment.
“ICICI Bank has now become the 2nd largest stock in Nifty 50 by free-float market cap, overtaking Reliance Industries. This is a direct result of how the Nifty calculates weights — based on freely tradeable shares, not total market cap.”~Zerodha Varsity
What This Means For Index Funds, ETFs, And Passive Investors:
The ranking change impacts around ₹5 lakh crore in assets benchmarked against the Nifty 50, including index mutual funds, ETFs, and institutional portfolios that tracked the benchmark. When ICICI Bank’s weight increases and Reliance’s weight decreases, every Nifty 50 tracker automatically holds slightly more ICICI Bank and slightly less Reliance without making any active decision. This results in mechanical buying pressure on ICICI Bank from passive vehicles and matching selling pressure on Reliance, creating a self-reinforcing dynamic.
For active fund managers, the shift is an invitation to reassess how overweight or underweight they want to be relative to the new benchmark composition. Given the divergence in earnings momentum between India’s leading private sector banks and the oil and gas sector, many managers are likely already positioned in a direction consistent with the new index weights. The formal reranking simply confirms what the market has been saying through price action for several months.
