The definition is a rank, not a rupee amount
SEBI defines the market cap categories by position in a ranked list of listed companies, not by any absolute value.
Companies are ranked by market capitalisation. A defined top band is large cap, the next band is mid cap, and everything below is small cap. The list is compiled and published periodically, and funds must align their portfolios to the current version.
Two consequences follow immediately, and both are counter-intuitive.
“Small cap” does not mean small. In a market with thousands of listed companies, a company ranked below the mid cap band can still be a substantial, profitable, well-known business. The label describes where it sits relative to others, not what it is.
The boundaries move. As the market rises, the rupee value at each rank rises with it — so a company can move between categories without changing at all in any meaningful sense, purely because the market re-rated.
A fund can be forced to sell a winner
Here is the mechanism that follows, and it is the part worth understanding before reading any performance comparison.
Each category must hold a stated minimum share of its portfolio in companies of that category. So when the list is revised and a holding is reclassified, the fund may have to act.
A small cap fund holds a company that performs well. Its market cap rises. At the next revision it is reclassified as mid cap. The fund may now be forced to reduce or exit a position that succeeded — not because the manager's view changed, but because the label did.
The same runs in reverse. A mid cap fund's holding that falls far enough is reclassified downward and may have to be sold at a bad moment for a reason unrelated to the company.
This is a structural cost of the categorisation, not a manager failing. It also means a constrained fund cannot simply hold its best ideas, which is worth remembering when comparing it against a flexi cap fund that can.
The main categories, and what each is really taking on
| Category | Must hold | What you are accepting |
|---|---|---|
| Large cap | Predominantly top-ranked companies | Lower volatility, and a universe most analysts cover — outperforming a large cap index is correspondingly hard |
| Mid cap | Predominantly the middle band | Higher growth potential, deeper drawdowns, and liquidity that thins in a fall |
| Small cap | Predominantly below the mid band | The widest outcomes, the worst liquidity, and the longest recoveries |
| Flexi cap | Equity, with freedom across market caps | Manager discretion — the outcome depends far more on the individual |
| Large and mid cap | A stated minimum in each | A blend fixed by mandate rather than by view |
| Sectoral or thematic | One sector or theme | Concentrated risk, and a bet on timing that is rarely acknowledged as one |
The liquidity point on small caps is the one that gets underweighted. In a sharp fall, smaller companies become difficult to sell at a fair price — so a fund facing redemptions may have to sell into weakness, which deepens the fall for everyone remaining. That is a structural feature of the category rather than a comment on any fund.
What actually differs inside one category
If two funds must hold broadly the same kind of company, what separates them?
- Concentration. Thirty holdings or seventy. A concentrated portfolio has a wider range of outcomes in both directions.
- Turnover. How often the manager trades. High turnover means costs the expense ratio does not show, since brokerage and taxes on the fund's trades come out of returns separately.
- Where the flexibility is used. Every category permits a minority allocation elsewhere. What a fund does with that portion says more about the manager than the compliant majority does.
- Cash held. A manager holding cash is making a timing call, whether or not it is described as one.
- Cost. Knowable in advance, unlike everything else on this list.
- Size. A very large fund in a small cap mandate faces a real constraint — it cannot take a meaningful position in a small company without moving the price.
That last point is worth watching. Size is the enemy of a small cap strategy, and a fund that performed well when small may not be able to repeat it once large.
Judging one honestly
Category returns are not comparable across categories — a small cap fund beating a large cap fund in a rising market tells you about the categories, not the managers.
Three comparisons that mean something:
Against its own benchmark, over long periods. This is the only test of whether active management earned its fee, and a category rank does not answer it — a top-quartile fund can trail its own index for years.
On rolling returns rather than trailing. A single trailing figure depends heavily on where the window ends, which matters most in volatile categories — exactly where these funds sit.
On drawdown. The worst fall and how long recovery took. In mid and small caps this is the number that determines whether an investor actually stayed, and therefore whether they received the returns at all.
The horizon question comes first
Before any of the above: equity of every category is long-horizon money.
Falls of a third or more happen, and recoveries have taken years — longer in mid and small caps than in large. Money needed within a few years does not belong here regardless of how good the fund is, and no amount of selection fixes a horizon mismatch. That is the ordering set out in the order of operations.
The corollary is the more useful one. Over long horizons the risk of holding too little equity is real, because an allocation that cannot outpace inflation is a slow and near-certain loss of purchasing power. Both risks exist, and which applies is decided by when the money is needed.
Checking what a fund actually holds
Every scheme publishes a monthly portfolio disclosure listing every holding and its weight. It answers concentration, sector tilt and where the discretionary allocation went — and it is the one part of fund communication that is not marketing.
FNOTrader's Mutual Funds app runs against the full AMFI NAV history — around 34 million NAV rows — reporting rolling-return distributions, benchmark-relative performance and maximum drawdown, plus a look-through to what the portfolio holds. Read the worst window rather than the average, particularly in mid and small caps where the gap between the two is widest.
FNOTrader is not a SEBI-registered investment adviser and does not recommend schemes.
Common questions
How are large, mid and small cap funds defined in India?
By position in a ranked list of listed companies by market capitalisation, not by any absolute rupee value. A defined top band is large cap, the next band mid cap, and everything below small cap — and the list is revised periodically.
Does 'small cap' mean the company is small?
Not necessarily. It means the company ranks below the mid cap band in a market with thousands of listed names, so a small cap holding can be a substantial, profitable and well-known business. The label is relative, not descriptive.
Can a fund be forced to sell a stock that did well?
Yes. Each category must hold a minimum share in companies of that category, so when a holding is reclassified upward after performing well, the fund may have to reduce or exit it — not because the view changed, but because the label did.
What is the main risk in small cap funds beyond volatility?
Liquidity. In a sharp fall smaller companies become hard to sell at a fair price, so a fund facing redemptions may have to sell into weakness — which deepens the fall for everyone remaining. It is structural rather than a comment on any fund.
What differentiates two funds in the same category?
Concentration, portfolio turnover and the costs it creates outside the expense ratio, how the permitted minority allocation is used, cash held, cost, and size — a very large fund in a small cap mandate cannot take meaningful positions without moving prices.
How should I compare equity funds?
Against each fund's own benchmark over long periods, on rolling returns rather than a single trailing figure, and on maximum drawdown and recovery time. Comparing a small cap fund against a large cap one tells you about categories, not managers.
Is a flexi cap fund better than a category fund?
It is less constrained — it can hold its best ideas across market caps rather than being forced to comply with a band. That makes the outcome depend far more on the individual manager, which is a different risk rather than a smaller one.
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