The point
A stock is large cap, mid cap or small cap because of where it ranks. Ranks 1 to 100 by full market capitalisation are large cap, ranks 101 to 250 are mid cap, and rank 251 onward is small cap. AMFI redraws the list twice a year, so the label follows the ranking, and the ranking keeps moving.
What decides whether a stock is large cap, mid cap or small cap?
A company's label comes from where it ranks among every listed company by full market capitalisation, which is the share price multiplied by the number of shares in issue. Nobody judges quality, size of profit or age of the business.
SEBI fixed the rule in circular SEBI/HO/IMD/DF3/CIR/P/2017/114 dated 6 October 2017. AMFI's own page for the list says SEBI defined the three categories so that every equity mutual fund scheme works from one shared investment universe. It also says SEBI told AMFI to prepare the list of stocks.
Oquilia's summary of the circular gives the three bands:
- Large cap: ranks 1 to 100 by full market capitalisation.
- Mid cap: ranks 101 to 250.
- Small cap: rank 251 onward, which is the long tail of the listed market.
AMFI builds the list from data supplied by BSE, NSE and the Metropolitan Stock Exchange of India, in consultation with SEBI and the exchanges. It publishes one list for January to June and one for July to December.
Source: AMFI, https://www.amfiindia.com/otherdata/categorisation-of-stocks, read 10 November 2026. Oquilia, https://www.oquilia.com/news/sebi-large-mid-small-cap-ranking-definitions, read 10 November 2026.
Why is a large cap not a fixed rupee size?
The three bands are counts of companies. The rupee line between them is whatever the 100th and 250th companies are worth on the day the list is drawn, and it rises and falls with the market.
Take the estimate Nuvama Institutional Equities published, as reported by 5paisa on 5 October 2026. The large-cap threshold was about ₹1.06 lakh crore in June 2026 and Nuvama expected it to rise to about ₹1.10 lakh crore. The mid-cap threshold was about ₹33,600 crore, expected to rise to roughly ₹36,500 crore.
Those are Nuvama's estimates, and AMFI draws the actual list. 5paisa says the final list depends on average market capitalisation over July to December 2026, and that the classification is expected to take effect from 1 February 2027.
Say a company is worth ₹1.08 lakh crore, which is ₹1,08,000 crore. Against a cut-off of ₹1.06 lakh crore it sits inside the top 100 and counts as large cap.
If the cut-off rises to ₹1.10 lakh crore, which is ₹1,10,000 crore, the same company is short by ₹2,000 crore. That gap is 2,000 divided by 1,08,000, about 1.85 percent of its own value. The business did not change, and its label moved from large cap to mid cap.
The same estimate named companies on both sides of the line. Nuvama expected the National Stock Exchange of India to qualify for large cap. It also expected seven companies to slip to mid cap, among them Godrej Consumer Products, Ambuja Cements and Vedanta.
Source: 5paisa, https://www.5paisa.com/blog/nse-may-enter-amfi-large-cap-list-in-h1-cy27-nuvama-estimates, last updated 5 October 2026, read 10 November 2026.
What does the label change inside a mutual fund?
The label sets the share of a scheme's assets that must sit in its own band. In Oquilia's summary of the 2017 framework, a large cap fund must hold at least 80 percent of its assets in large cap stocks. A mid cap fund and a small cap fund must each hold at least 65 percent in their own band.
On a ₹25 lakh allocation to each type of scheme, the floors work out like this.
- Large cap fund: 80 percent of ₹25,00,000 is ₹20,00,000 that must sit in ranks 1 to 100. The other ₹5,00,000 can sit anywhere.
- Mid cap fund: 65 percent of ₹25,00,000 is ₹16,25,000 that must sit in ranks 101 to 250. The other ₹8,75,000 is free.
- Small cap fund: the same 65 percent floor, so ₹16,25,000 in rank 251 onward and ₹8,75,000 free.
So a stock crossing a boundary changes what a manager is allowed to hold. 5paisa notes that a change of category does not automatically generate mutual fund buying or selling. It alters the universe that funds with market-cap mandates can draw from.
Source: Oquilia, read 10 November 2026. 5paisa, read 10 November 2026.
How does a stock move between categories?
It moves when its market capitalisation, averaged over the review period, ranks it on the other side of rank 100 or rank 250. Both directions happen in every list.
A stock ranked 100 leaves large cap the moment one company overtakes it. A stock ranked 101 enters by overtaking one. Movement near a boundary is common and tells you little about either business.
This is also why a headline about a stock being "promoted" to large cap is a statement about rank. It says the company overtook another listed company by size. It says nothing about earnings, debt or what the shares will do.
What should a holder do with the label?
Use it as a description of size and nothing more. The label tells you which band of the market a holding sits in on the day of the list. It does not tell you how much of your portfolio that holding should be.
The decision that carries weight is the allocation: how much of the portfolio each sleeve gets, and what rule moves money between them. A label that flips on a ranking can turn a large cap holding into a mid cap one without the investor doing anything. If the allocation was set by rule, nothing in it needs to change.
The same logic carries over to crypto. Qatobit runs four QSI Crypto Indices, three of which hold crypto. Each is designed and rebalanced monthly on a published methodology, so the weights come from a rule rather than a mood. An investor who tracks every reclassification is following a ranking. An investor who checks the sleeve sizes against the plan on a set schedule is following the plan.
Where to go next
Start with what asset allocation is and what it decides before any pick. For the other side of a concentrated portfolio, read concentration risk and why a few holdings can decide everything. To see what a rule-based reset looks like in practice, portfolio rebalancing when one holding falls 10 percent walks through the arithmetic.
Frequently asked questions
What are the market-cap bands for large cap, mid cap and small cap in India?
Large cap is ranks 1 to 100 by full market capitalisation, mid cap is ranks 101 to 250, and small cap is rank 251 onward. SEBI set the bands in its circular of 6 October 2017, and AMFI prepares the list.
Who decides which stock is large cap, mid cap or small cap?
AMFI prepares the list under SEBI's circular, in consultation with SEBI and the stock exchanges. It uses data from BSE, NSE and the Metropolitan Stock Exchange of India, and publishes a list for January to June and another for July to December.
How much must a large cap or mid cap fund hold in its own category?
A large cap fund must hold at least 80 percent of its assets in large cap stocks. A mid cap fund and a small cap fund must each hold at least 65 percent in their own band.
Is there a fixed rupee market cap for large cap?
No. The bands are ranks, so the rupee line is the value of the 100th company on the day the list is drawn. Nuvama estimated it at about ₹1.06 lakh crore in June 2026 and expected about ₹1.10 lakh crore, as reported by 5paisa on 5 October 2026.
Does a stock moving to large cap mean it is a better company?
No. A move only means the company's average market capitalisation now ranks inside the top 100. It says nothing about profit, debt or quality.
Crypto investments are subject to market risk. Not financial advice.
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