Stock Picking vs. Index Funds: What the Data Shows

There is a question every investor faces at some point: is it better to try to pick the best individual stocks, or is it more efficient to simply buy the index and wait? The debate is old, but Brazilian data from 2026 adds new layers — including an Ibovespa approaching 200,000 points and small caps trading at a 33% discount to historical multiple averages.

This question has no single answer. But it has data. And the data points to clear directions in some respects — and honest ambiguity in others.

What the Ibovespa has done

The Ibovespa entered 2026 with substantial accumulated gains. By March 2026, the index had appreciated significantly from its 2022-2023 lows, approaching the 200,000-point level. BOVA11 — the ETF that replicates the Ibovespa — is the simplest way to capture that performance at low cost.

For the investor who bought BOVA11 five years ago and held without doing anything, the accumulated result includes not just the index appreciation but also dividends distributed by component companies (passed through in JCP and proventos adjustments).

What the evidence says about active management

The most cited data point in the stock picking vs. index debate comes from the United States, where Warren Buffett publicly bet in 2007 that no hedge fund would outperform the S&P 500 over 10 years. He won: the S&P 500 accumulated 125.8% in the period vs. an average of 36% for the selected hedge funds.

In Brazil, the picture is similar, with nuances:

• The majority of active equity funds do not consistently beat the Ibovespa over 10 years, especially after deducting management and performance fees
• The SPIVA report (S&P Indices vs. Active) for the Brazilian market shows that over 5- and 10-year horizons, more than 75% of active equity funds fall below their benchmark
• However, Brazil has specific contexts: a more concentrated market, fewer analysts covering small caps, and large macroeconomic swings that create alpha windows for well-positioned managers

Small caps at a 33% discount: the stock picking thesis

Here is one of the most interesting data points from 2026: Brazilian small caps trade at a 33% discount to historical multiple averages. The small caps index (SMLL11) operates around 9.0x earnings — significantly below the historical average of 13.4x.

This discount exists for concrete reasons:

1. The high Selic favors fixed income and penalizes smaller companies that depend more on bank credit
2. Foreign investors concentrate positions in high-liquidity stocks (Petrobras, Vale, banks)
3. Small caps have lower analyst coverage, generating pricing inefficiencies

For those who believe in stock picking, the argument is that this discount creates opportunity: quality companies trading below fair value for technical market reasons, not due to fundamental deterioration.

The comparison table: four investment vehicles

IVVB11 deserves specific mention: it replicates the S&P 500 in reais, providing currency diversification for Brazilian investors without needing to open an overseas account. The downside is 15% capital gains tax on fund share sales, the same as other ETFs.

Tax considerations in Brazil

In Brazil, taxation affects the stock picking vs. index debate materially:

ETFs (BOVA11, SMLL11, IVVB11):

• Capital gains taxed at 15% on sale, regardless of amount
• No exemption for sales below R$20,000/month (available for individual stocks)

Individual stocks:

• Income tax exemption for sales up to R$20,000 per month
• Gains above that threshold taxed at 15% (regular operations) or 20% (day trading)

This difference creates a genuine argument for smaller investors (less than R$20,000/month in sales): the tax exemption on individual stocks is a concrete advantage over ETFs. For larger volumes, the difference disappears.

What 10 years of data honestly shows

The long-term evidence favors index funds for most investors, through the combination of low cost, automatic diversification, and absence of selection bias. But "most investors" is not all investors.

There are managers who consistently outperform the index in Brazil. They are a minority, but they exist. The problem is that it is extremely difficult to identify, in advance, which managers will continue outperforming over the next 10 years.

For the individual investor doing stock picking without deep analysis, the data suggests that, on average, the result will fall below the index — especially after considering the opportunity cost of time dedicated to analysis.

For those with genuine analytical competence, focus on less-covered segments (like small caps at a 33% discount), and long-term discipline, stock picking still has a case.

What to consider in your strategy

If you have less than R$100,000 invested: The simplicity of an ETF likely outweighs the marginal benefit of individual selection. BOVA11 or IVVB11 as a core, with smaller positions in sectors of conviction, is a reasonable approach.

If you invest more than R$20,000/month: Consider individual stocks to capture the tax exemption, even if the portfolio roughly follows the index.

If you want small cap exposure: SMLL11 captures the 33% discount in a diversified way. Selecting individually requires deeper analysis, but the current discount supports the entry argument.

Both can coexist

The stock picking vs. index debate is often presented as binary, but it does not need to be. A portfolio with an ETF core and satellite positions in selected stocks captures the best of each approach: low cost, automatic diversification at the core, and alpha potential in the satellites.

Royal Binary, founded by Sidnei Oliveira, works with active short-term management in variable income — a different environment from long-term investing, but equally dependent on data analysis and risk discipline.

Explore the platform and see how it works.