Small-Cap Mutual Funds: Does Benchmark Overlap Predict Performance?
Analysis of one-year returns shows that portfolio overlap is not a reliable performance indicator.
1Benchmark Overlap Misconceptions
Investors often analyze how closely a small-cap fund mirrors its benchmark index to gauge strategy. However, recent data from Value Research indicates that high portfolio overlap does not guarantee superior returns. Comparing various schemes reveals that the correlation between index similarity and actual performance is inconsistent across the small-cap mutual fund sector.
2Performance Disparities Observed
The Bank of India Small Cap Fund achieved a 29.1% return with only 11.4% overlap. Conversely, the Axis Small Cap Fund, featuring a 31.5% overlap, delivered a 9% return. These figures demonstrate that funds with vastly different structural compositions can produce widely varying outcomes, regardless of their proximity to the Nifty Smallcap 250 TRI.
3The TRUSTMF and Axis Gap
A striking contrast exists between TRUSTMF and Axis Small Cap funds. Despite having a portfolio overlap difference of just 3.1 percentage points, their one-year returns diverged by 19.8 percentage points. This significant performance gap highlights that internal stock selection and weightings are far more critical to returns than simple index tracking metrics.
4Low Overlap Risks
Low benchmark overlap does not inherently signal outperformance. While some funds with low overlap performed well, the Tata Small Cap Fund, which maintained the lowest overlap at 7%, recorded a negative return of 0.1%. This confirms that deviating from the benchmark is not a foolproof strategy for generating alpha in small-cap markets.
5Limitations of Overlap Metrics
Portfolio overlap measures commonality but fails to capture specific stock weightings, individual asset performance, or the contribution of non-benchmark holdings. Because it ignores these granular details, two funds with identical overlap percentages can yield drastically different results. Investors must look beyond this single metric to understand the true drivers of fund returns.
6Data Context and Benchmarks
This analysis utilizes September 2026 portfolio disclosures and one-year returns as of 13 October 2026. Most funds were compared against the Nifty Smallcap 250 TRI, while Union and Quantum funds were measured against the BSE 250 SmallCap TRI. These benchmarks provide the necessary framework for evaluating relative performance across the diverse small-cap landscape.
7Strategic Assessment Requirements
Investors should evaluate portfolio overlap alongside investment strategy, composition, and performance across various market conditions. A single year of data reflects specific environmental factors and cannot predict future consistency. Relying solely on overlap as a shortcut for identifying winning funds ignores the complex interplay of market trends and active management decisions.
8Investor Takeaway
A fund does not need to mirror its benchmark to deliver strong returns, nor does a unique portfolio guarantee success. Portfolio overlap remains a useful factor for understanding fund positioning, but it is not a standalone measure of quality. Informed decisions require a holistic view of the fund's entire investment approach and history.
Original article: mint - money — Small-Cap Mutual Funds: Does Benchmark Overlap Predict Performance?