Why small-cap stocks earn higher long-term returns than large-caps, the role of liquidity risk, and why size is the factor most affected by your portfolio size in Indian markets.
TK
Tanmay Kurtkoti
Founder & CEO, RupeeCase
⏱ 13 min read⟳ Updated 6 May 2026◆ Intermediate
The Size factor was Fama and French's first major discovery beyond market beta. In their original 1992 paper, they found that small-cap stocks earned significantly higher average returns than large-cap stocks, after controlling for market risk. They called this the SMB factor | Small Minus Big.
In India, the size premium is one of the most visible return patterns in the entire market. Nifty Midcap and Smallcap indices have dramatically outperformed the Nifty 50 over most 10-year periods. But the journey has been volatile, lumpy, and periodically brutal | which is why most retail investors either miss it entirely or enter at the wrong time.
Size premium in numbers, Indian market lens
17.6
% Nifty Midcap 150 TRI 10Y CAGR to Mar 2025
NSE
15.9
% Nifty Smallcap 250 TRI 10Y CAGR to Mar 2025
NSE
13.1
% Nifty 50 TRI 10Y CAGR to Mar 2025
NSE
64
% Smallcap 250 peak to trough drawdown 2018 to 2020
NSE daily
NSESEBIAMFI
The size premium capture flow that actually survives drawdowns
1
Cap allocation
Max 20 pct small cap
2
Liquidity filter
ADV above 5Cr daily
3
Rebalance quarterly
Not monthly, turnover kills
4
Volatility sizing
Smaller weight per name
5
Hold 5Y minimum
Survive one full cycle
Most retail investors enter small cap after a 2 year rally and exit after a 30 percent drawdown. The premium is real, the capture requires structure.
Nifty 500 by market cap band, Mar 2026 composition
Large cap top 100 72
Mid cap 101 to 250 18
Small cap 251 to 500 10
Aggregate market cap share. The bottom 250 names hold just 10 percent of the float but drive a disproportionate share of cross sectional alpha. Source AMFI SEBI cap curve Mar 2026.
Rolling 10Y return by cap band, 2005 to 2025
Nifty 50 TRI
13.1
Nifty Next 50 TRI
14.8
Nifty 500 TRI
14.2
Nifty Midcap 150
17.6
Nifty Smallcap 250
15.9
Nifty Microcap 250
18.5
Average rolling 10Y CAGR across all rolling windows 2005 to Mar 2025. Smaller sizes earn more over full cycles. The standard deviation also rises with smaller size.
My 2018 small cap exit that cost me 3 years of compounding. End of 2017 my small cap sleeve was up 76 percent. I got cocky, pushed the allocation from 15 percent of book to 32 percent. When IL and FS blew up in Sep 2018 my small cap book drew down 48 percent while the large cap book drew 11 percent. I forced sold in Feb 2019 at the low. The Nifty Smallcap 250 went on to compound at 24 percent a year for the next 5 years from that exact level. The premium is real but the path punishes anyone who sizes bigger than their sleep quality can absorb. Cap the small cap sleeve at 20 percent of total book. Always.
The Indian market size spectrum
Large Cap
Top 100 companies by market cap. Nifty 50 and Nifty Next 50. Reliance, TCS, HDFC Bank, Infosys, ICICI Bank.
Deep liquidity, heavy analyst coverage, lower expected return premium
Mid Cap
Rank 101 to 250. Nifty Midcap 150. Companies like Voltas, Persistent Systems, Alkem Labs, Sundram Fasteners.
Rank 251+. Nifty Smallcap 250. Thousands of companies with limited institutional coverage.
Lower liquidity, sparse coverage, higher return potential AND higher risk
SEBI classifies large, mid, and small-cap stocks formally | large-cap is top 100 by market cap, mid-cap is 101 to 250, small-cap is 251 and beyond. This classification is used for mutual fund categorisation, so Indian investors encounter it frequently.
Small-cap stocks are harder to buy and sell in large quantities. The bid-ask spread is wider. In a market stress event, small-cap prices can fall dramatically simply because there are no buyers | not because the underlying business deteriorated. Investors demand a premium for bearing this liquidity risk, and that premium shows up as higher long-run returns.
2. Information asymmetry
Small-cap companies are under-researched. Fewer analysts cover them, institutional ownership is lower, and information about them is harder to obtain. In a market where information is the primary resource, less-efficiently-priced stocks offer more alpha opportunities for investors willing to do the work. The flip side: when negative surprises arrive, they can be severe.
3. Higher growth potential
A ₹500 crore revenue company can double to ₹1,000 crore more easily than a ₹1 lakh crore company can double to ₹2 lakh crore. Small companies operate in niches where they can grow faster than the economy. This genuine growth advantage is reflected in long-run return premiums for the small-cap segment.
The brutal reality of small-cap investing
The size premium in India is real | but it comes with significant caveats that every systematic investor must understand:
Deep drawdowns | Nifty Smallcap 250 fell 60%+ in 2018 and took 3+ years to fully recover. Investors who entered near the 2018 peak endured painful multi-year losses before recovery. The Sharpe ratios are much lower than the headline CAGR suggests.
Liquidity constraints scale with portfolio size | for a ₹5 lakh portfolio, you can easily invest in Nifty 500 small-cap stocks. For a ₹50 crore portfolio, the same small-cap positions would move the market against you. This is why large institutional funds avoid small caps | not because the premium doesn't exist, but because they can't access it at scale.
Quality matters more in small caps | corporate governance failures, promoter fraud, and accounting manipulation are far more common in the small-cap universe than in large caps. Applying quality filters before investing in small-caps is not optional | it's essential.
The RupeeCase approach to size: The Nifty 500 universe already captures the size premium to a meaningful extent | it includes the top 500 stocks, including significant mid-cap and smaller large-cap exposure. Going below Nifty 500 adds liquidity and governance risk that is difficult to manage systematically without point-in-time data and quality filters. This is why RupeeCase uses Nifty 500 as the default universe rather than the broader market.
Size in Indian markets | the evidence
+6%
Approximate annualised SMB (Small Minus Big) premium in Indian market over long periods | significant but lumpy
−60%
Nifty Smallcap 250 drawdown during 2018 Indian small/mid-cap crash | the price of the size premium
3 to 5yr
Typical recovery time after large small-cap drawdowns in India | requires long investment horizon
The size premium in India is strongest when combined with a quality filter. Small companies with strong balance sheets, low debt, and consistent profitability | call them "quality small-caps" | show stronger and more consistent returns than the broad small-cap universe. The combination of Size + Quality is the academic equivalent of what practitioners call "small-cap growth at a reasonable price."
Size exposure within RupeeCase strategies
RupeeCase operates within the Nifty 500 universe, which provides meaningful mid and small-large-cap size exposure without going into the illiquid tail. The momentum strategy naturally captures size exposure | high-momentum stocks are often mid-cap companies in growth phases. The factor screener shows market capitalisation alongside factor scores, so you can see where your potential portfolio falls on the size spectrum.
Explore size in Indian markets
See market cap alongside factor scores for all 500 Nifty stocks
Filter, rank, and explore | no spreadsheets needed.
The Fama-French size factor | the return of a portfolio that is long small-cap stocks and short large-cap stocks. The original documentation of the size premium.
Liquidity premium
Extra return earned for holding assets that are harder to sell quickly without a price impact. A key explanation for the size premium in small-cap stocks.
SEBI size classification
SEBI defines large-cap as top 100 by market cap, mid-cap as 101 to 250, and small-cap as 251 and beyond. Used for mutual fund categorisation.
Information asymmetry
Less analyst coverage and information availability for small stocks creates pricing inefficiency | which patient investors can exploit.
TK
A note from the author
Why this matters
The size factor in India is a double-edged sword. Small-caps can deliver extraordinary returns, but liquidity constraints and impact costs can silently destroy your edge. After managing systematic small-cap strategies through multiple cycles, I can tell you that how you harvest the size premium matters just as much as whether it exists.
Want to put this into practice? RupeeCase is the systematic investing terminal built around everything you're learning here, factor scores, strategy backtests, portfolio construction for Indian markets.
→ Fama, E. & French, K. (1992). The Cross-Section of Expected Stock Returns. Journal of Finance.
→ Ibbotson, R. et al. (2013). Liquidity as an Investment Style. Financial Analysts Journal.
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