B3 Launches ‘Smart Rebal’ Small Cap Index, Targeting Lower Turnover and New Institutional Flows
Brazil’s B3 stock exchange launched the Small Cap Smart Rebal B3 (SCSR) index, linked to the XCAP11 ETF, featuring a gradual rebalancing mechanism to reduce transaction costs and volatility.
B3, Brazil’s stock exchange, has introduced a new passive investment vehicle aimed at attracting deeper institutional capital into the country’s mid- and small-cap stocks. The exchange launched the Small Cap Smart Rebal B3 (SCSR) index on August 7, 2026, which is already tracked by the new XCAP11 ETF from XP Asset. The SCSR index's core innovation is its “smart rebal” methodology, which phases portfolio adjustments over consecutive rebalances, a feature designed to reduce turnover, lower transaction costs, and provide greater predictability for managers and investors.
The gradual transition aims to solve a common problem with index-tracking funds, where large, sudden movements in a stock's price or market cap can force managers to buy or sell large blocks of stock near the rebalancing date, often at suboptimal prices. The SCSR index addresses this by requiring an asset to enter or exit the portfolio in three distinct phases: an incoming stock takes 33% of its target weight in the first rebalance, 67% in the second, and 100% in the third. Exclusions follow the reverse process. This shift is intended to bring stability to the Brazil small cap segment and facilitate the development of more efficient passive products.
The SCSR is designed to track companies outside the group that makes up the top 85% by market value of all listed B3 companies, a crucial detail for the international investor who needs to understand the cutoff point. Beyond size, the index applies strict liquidity and quality filters: companies must not be classified as “penny stocks” (trading below R$1) and must have maintained a high presence (95%) and negotiability across recent trading periods. This selection criteria, coupled with the lower-turnover mechanism, is a direct challenge to the widely used SMLL index, which has historically served as the main benchmark for this segment.
Initial projections based on historical backtesting have positioned the new index favorably against the existing reference. According to figures shared by XP Asset, the SCSR methodology would have yielded a performance 60% superior to the SMLL index over the last ten years, while maintaining a 99.9% correlation to the traditional index. For investors, the linked XCAP11 ETF offers another distinct advantage: a lower administration fee of 0.3%, compared to the 0.5% average charged by competing local small-cap ETFs. This combination of a higher-performing index methodology and a lower expense ratio is structured to attract significant institutional flows seeking cost-efficient exposure to the dynamic Brazilian equities segment.
The launch signals a maturation in the Brazil stock market index product landscape, where asset managers and the exchange itself are collaborating to create more refined benchmarks. Investors should now watch for the initial trading volumes and net asset flows into the XCAP11 ETF, as strong uptake will determine if the competing SMLL-linked ETFs adjust their own structures or pricing to defend their market share against the new SCSR methodology.
What it touches The new index and ETF are a direct market event for the Brazilian exchange operator B3 (B3SA3) and the issuing asset manager XP Asset. The launch creates immediate competitive pressure on products tracking the traditional SMLL index, especially those that cater to large institutional clients for whom minor differences in tracking error, turnover, and fees—such as the 0.3% fee on the XCAP11 ETF—can significantly affect long-term returns.