Large, Mid and Small Cap Funds: How to Choose Well
Large, mid and small cap funds are separated by the size of the companies they must hold, and SEBI fixes those buckets so the labels mean the same thing across every fund house. Large cap funds hold India’s biggest 100 listed companies, mid cap funds hold the next 150, and small cap funds hold everything from the 251st company downwards.
The size of the companies in a fund decides how violently it moves, and that volatility, not the fund manager’s skill, is the main reason returns differ across the three categories over short periods.
What follows is the rulebook behind the labels, how each category behaves when the market falls, the recovery maths in rupees, and a practical way to split money between the three.
The rulebook behind the three labels
SEBI’s scheme categorisation rules removed the guesswork. Companies are ranked by full market capitalisation and slotted into buckets, and the list is refreshed periodically by AMFI so a fund cannot quietly drift.
Large cap funds
Minimum 80% of the portfolio in the top 100 companies. Household names with long operating histories, wide analyst coverage and deep trading volumes. Price discovery is efficient, which cuts both ways: fewer nasty surprises, and fewer bargains.
Mid cap funds
Minimum 65% in companies ranked 101 to 250. Businesses here are established but still scaling. Coverage is thinner, so genuine research can add value, and a single bad quarter can knock 20% off a stock.
Small cap funds
Minimum 65% in companies ranked 251 and below. This is several thousand companies, many illiquid. A small cap fund with a large corpus can struggle to exit without moving the price against itself. Our note on market capitalisation explains how the ranking is built.
How the three behave when the market falls
Ask anyone who lived through a correction and you get the same pattern. Large caps fall, mid caps fall harder, small caps fall hardest and take longest to come back.
| Feature | Large cap | Mid cap | Small cap |
|---|---|---|---|
| Minimum allocation rule | 80% in top 100 | 65% in 101 to 250 | 65% in 251 and below |
| Typical drawdown in a bad market | Moderate | Deeper | Deepest |
| Liquidity of underlying stocks | High | Medium | Often thin |
| Suggested minimum holding period | 3 to 5 years | 5 to 7 years | 7 years or more |
| How much research changes outcomes | Low | Meaningful | High |
| Where it usually sits in a portfolio | Core | Growth | Satellite |
Those holding periods are not arbitrary. They reflect how long each category has historically needed to work through a full cycle of enthusiasm and disappointment.
A worked example: recovery maths on Rs 5 lakh
Suppose you hold Rs 5 lakh in each category and a sharp correction hits. For illustration, large caps fall 25%, mid caps 38% and small caps 50%.
- Large cap: Rs 5,00,000 becomes Rs 3,75,000, and needs 1,25,000 / 3,75,000 = 33% to recover.
- Mid cap: Rs 5,00,000 becomes Rs 3,10,000, and needs 1,90,000 / 3,10,000 = 61% to break even.
- Small cap: Rs 5,00,000 becomes Rs 2,50,000, and needs 100% just to return to where it started.
Now blend Rs 5 lakh, split 60% large, 25% mid and 15% small. The weighted fall is (0.60 x 25) + (0.25 x 38) + (0.15 x 50) = 15 + 9.5 + 7.5 = 32%. The portfolio drops to Rs 3,40,000 and needs 47% to recover.
That is the entire argument for a mix in one calculation. You give up some small cap upside and in exchange you cut the size of the hole you must climb out of. The numbers above are an illustration, not a forecast.
Which category should get the biggest share of your money?
For most people it is large caps, and the reason is behavioural rather than mathematical. The category you can keep holding through a 30% fall is the one that compounds for you. A small cap allocation you panic out of at the bottom is worse than a large cap allocation you never touch.
A workable default for a five year plus horizon: large caps as the core, mid caps as the growth engine, small caps capped at a size where a 50% fall would not change your plans. If a Rs 1 lakh small cap holding halving would make you stop your SIP, the holding is too big.
Age matters less than horizon. A 30 year old saving for a house deposit in three years has no business in small caps. A 55 year old with a 15 year retirement horizon and a stable income can carry more risk than standard advice suggests.
How to build the mix, step by step
- Write down the money’s purpose and the year you will need it. Anything within three years should not be in equity funds at all.
- Fix your total equity allocation first, then split it. Choosing between mid and small cap before that is doing the work in the wrong order.
- Start with one large cap or index fund and run it for a full year before adding anything.
- Add a mid cap fund next, sized as a clear minority of the equity pot.
- Add small caps last, and only through a SIP so entry price is spread out. Our comparison of SIP versus lump sum matters most here.
- Review yearly against the fund’s benchmark and category, not against the best performer of the last six months.
Which mistakes cost investors the most?
Buying the category that just performed best. Small cap funds attract the heaviest inflows after they have already run up, close to the worst possible timing.
Holding six funds and calling it diversification. Look at the underlying stocks and you often find the same 40 names repeated. Genuine diversification across mutual funds comes from different market segments, not different fund names.
Ignoring the expense ratio because the return looks good. A gap of 1% a year in fees compounds into a large sum over 15 years, and direct plans always cost less than regular plans of the same scheme.
Judging a small cap fund on one year of returns. That window tells you nothing about the manager and everything about the market’s mood.
A plain risk note: all three categories can lose money, and the riskometer on every scheme document is refreshed monthly for a reason. Check the scheme information document for the current expense ratio and exit load, since these change.
Frequently Asked Questions
Can I skip mid and small cap funds entirely and still do well?
Yes. A single diversified large cap or index fund held for 15 years is a complete equity plan for many households. You give up some upside in strong small cap phases, but you also avoid the deepest drawdowns. Simplicity you can stick with beats a complicated mix you abandon.
How many funds do I need across the three categories?
Two or three is enough. One large cap, one mid cap and at most one small cap covers the whole market. Beyond that, portfolios overlap heavily and tracking them becomes a chore without improving the outcome. Adding a fourth or fifth fund almost always buys duplication rather than diversification.
Do small cap funds always beat large cap funds over long periods?
No. Small caps have delivered stronger returns in some stretches and clearly worse returns in others, and the sequence decides your personal outcome. Someone who starts a small cap SIP just before a multi year slump can wait years to catch up with a plain large cap investor.
What happens if a company in my mid cap fund gets reclassified as large cap?
Nothing dramatic. When the ranking list is refreshed, the fund gets a window to bring its portfolio back within the mandated limits. Managers often hold a winner until it has to be trimmed, which is normal and disclosed in the monthly portfolio statement.
How do I check whether my fund is actually holding what it claims?
Read the monthly portfolio disclosure on the AMC website and compare the top holdings against the category definition. Also check the stated benchmark, which the scheme must name. A mid cap fund holding mostly familiar large names deserves a closer look before you add more money to it.
Key Takeaways
- The categories are defined by company rank, not by fund house marketing: top 100, then 101 to 250, then 251 and below.
- Large cap funds must keep at least 80% in large caps; mid and small cap funds must keep at least 65% in their bucket.
- A 50% fall needs a 100% gain to recover, which is why small cap position size matters more than small cap selection.
- Match holding period to category: roughly 3 to 5 years for large cap, 5 to 7 for mid cap, 7 or more for small cap.
- Size your small cap allocation so a halving would not make you stop investing.
- Direct plans of the same scheme cost less than regular plans, and that gap compounds over every year you hold.
