Mid Cap vs Small Cap Fund Overlap: How Much Do They Really Share?
Pairing a mid-cap fund with a small-cap fund is one of the most popular ways Indian investors chase growth. The intuition is that they sit in different parts of the market — so they shouldn't overlap. Mostly true, but not entirely.
Quick answer
A mid-cap and a small-cap fund usually overlap far less than two funds in the same category — typically 10-25%, versus 40-60% for two mid-caps or two small-caps. That's because SEBI requires each to keep at least 65% in its own market-cap band. But the overlap is rarely zero: both funds can hold up to ~35% outside their band, and stocks constantly drift across the mid/small boundary.
In this guide:
How SEBI Defines Large, Mid & Small Cap
SEBI ranks every listed company by market capitalisation and slots it into one of three buckets. This ranking is what every fund must follow, so it's the foundation of the whole overlap question:
| Category | Rank by market cap | Fund mandate |
|---|---|---|
| Large cap | Top 100 companies | ≥ 80% in large caps |
| Mid cap | 101st – 250th | ≥ 65% in mid caps |
| Small cap | 251st onwards | ≥ 65% in small caps |
The key numbers: a mid-cap fund must keep at least 65% in companies ranked 101-250, and a small-cap fund at least 65% in companies ranked 251 and below. By design, their core 65% sits in different pools of companies.
Why Mid- and Small-Cap Funds Overlap Less
This is the opposite of what we saw with same-category funds. Two large-cap funds both fish from the same 100 companies, so they share 50-70% of holdings. A mid-cap and a small-cap fund are mandated to fish from different ranges of the market — companies 101-250 versus 251+. Their mandatory cores barely touch, which is why a well-chosen mid + small pair is one of the better ways to genuinely diversify rather than just adding more of the same. (For the same-category problem, see whether your SIPs are buying the same stocks.)
Why It's Still Not Zero
Even though the cores differ, real overlap creeps in through three doors:
1. The flexible ~35%. A mid-cap fund only has to keep 65% in mid caps — the other 35% can go into large caps or small caps. A small-cap fund is the same in reverse. So a mid-cap fund's small-cap slice and a small-cap fund's core can land on the same names.
2. Boundary migration. The line between "mid" and "small" is just a rank cut-off (250 vs 251). Companies cross it constantly as their prices move. A stock sitting at rank 245 is mid cap; a rally pushes a rank-255 stock up to 248 and now both a mid-cap and a small-cap fund may legitimately hold it.
3. Liquidity comfort. Small-cap funds frequently park a meaningful chunk in larger, more liquid mid-cap names so they can move in and out without crashing the price. That liquidity buffer often mirrors what mid-cap funds already own.
Two Mid-Caps (or Two Small-Caps) Is a Different Story
If your portfolio has two mid-cap funds, or two small-cap funds, the overlap shoots back up — typically 40-60% — for the same reason two large-cap funds overlap: they're mandated into the same narrow band. Holding two funds in the same cap category is usually where redundancy hides, not in a mid + small pairing.
How Much Overlap to Expect
Rough, real-world ranges for any two equity funds (exact figures vary by fund and month):
| Combination | Typical overlap | Verdict |
|---|---|---|
| Mid cap + Small cap | 10-25% | Healthy |
| Large cap + Small cap | 5-15% | Healthy |
| Large cap + Mid cap | 10-20% | Healthy |
| Two mid-cap funds | 40-60% | Redundant |
| Two small-cap funds | 40-60% | Redundant |
Illustrative ranges. For a framework on what counts as too much, see the bands in our overlap basics guide.
Building a Low-Overlap Mid + Small Combo
A mid-cap and a small-cap fund already start with low overlap. To keep it that way:
Avoid same-AMC, same-philosophy pairs. Two funds from the same fund house, run by the same team with the same screening process, tend to converge even across categories. Mixing houses and styles widens the gap.
Mind the "true to label" tilt. Some mid-cap funds run heavy in large caps for stability; some small-cap funds lean toward bigger small caps. Two funds that both lean toward the mid/small boundary will overlap more than two that stay firmly in their lanes.
Don't stack a flexi-cap on top. Most flexi-cap funds are large-cap heavy but also dip into mid and small caps — adding one on top of a mid + small pair can quietly re-introduce overlap. See low-overlap fund combinations for tested pairings.
Watch the Drift Over Time
Overlap is not a one-time measurement. Because the mid/small boundary moves and managers rebalance every month, two funds that overlap 12% today might overlap 22% six months later as shared names migrate across the rank-250 line. A pair you checked at purchase can quietly drift into redundancy.
That's worth re-checking a couple of times a year — especially after a strong small-cap rally, when more names get promoted toward mid-cap territory and start showing up in both funds.
How to Check Your Mid + Small Overlap
Comparing two funds' month-end holdings by hand is doable but tedious. A tool does it instantly and also catches the drift you'd otherwise miss.
Check your fund overlap in 30 seconds
OverlapIQ compares up to 10 funds at once and gives you the exact pairwise overlap percentage, your most concentrated stocks, and per-fund uniqueness. Save your funds to My Portfolio and you can track how their overlap shifts month over month — which is exactly how you catch boundary drift between a mid-cap and a small-cap fund. Free, no signup.
Compare My Funds →Frequently Asked Questions
Do mid-cap and small-cap funds hold the same stocks?
They overlap far less than two funds in the same category — typically 10-25% versus 40-60% — because SEBI requires each to hold at least 65% in its own market-cap band. But the overlap is rarely zero.
Why isn't the overlap zero if they target different segments?
Both funds can invest up to about 35% outside their mandated band, individual stocks migrate across the mid/small boundary as their market cap changes, and small-cap funds often hold some mid-caps for liquidity. All three create genuine overlap.
Is it okay to hold both a mid-cap and a small-cap fund?
Yes. It is a common way to add diversified higher-growth exposure because their core holdings differ. Just verify the actual overlap and avoid two funds from the same fund house running the same strategy.
Which overlaps the most: two mid-caps, two small-caps, or a mid plus a small?
Two funds in the same category — two mid-caps or two small-caps — overlap the most, often 40-60%. A mid-cap paired with a small-cap overlaps the least of the three combinations.
How do I check the overlap between my mid-cap and small-cap funds?
Compare each fund's published holdings, or use a tool such as OverlapIQ to get the exact overlap percentage between them in a few seconds.
Disclaimer: This article is for educational purposes only and does not constitute investment advice. Mid- and small-cap funds carry higher volatility and risk. Mutual fund investments are subject to market risks; read all scheme-related documents carefully. Consult a SEBI-registered investment advisor for personalised advice.