It is a passive ETF managed by Vanguard that tracks the CRSP US Small Cap Index. It holds US-listed small-cap stocks on a market-cap-weighted basis and, when combined with a large-cap core holding, strengthens diversification across market-cap segments.

It suits asset allocation investors who want to add a small-cap weighting to a large-cap core, as well as long-term investors who want to manage broad market diversification separately by market-cap segment.

It is an ETF run by Vanguard using a passive (index-tracking) approach.

It holds US small-cap stocks, as classified by CRSP, on a market-cap-weighted basis. Because the profitability screen used in the S&P SmallCap 600 is not applied, it holds a wider range of stocks, and it has structural characteristics distinct from the weaker-quality exposure found in the Russell 2000-tracking IWM and VTWO.

• Broad exposure tracking CRSP small caps
• Ultra-low-cost small-cap core holding
• The standard small-cap ETF in Vanguard's lineup

Assets under management (AUM) stand at $78.8B, and the expense ratio is 0.03% per year.

Among the funds shown in the table, IJR and SPSM track the S&P SmallCap 600 and apply a profitability screen, IWM and VTWO track the Russell 2000 and carry a somewhat larger share of weaker companies, and SCHA tracks Schwab's small-cap index. VB stands out for its broad stock diversification.

In risk-on phases, it has shown notably larger gains than large-cap core ETFs, while in periods of rising interest rates and widening credit spreads, its volatility has expanded sharply.

It belongs to the group of large small-cap ETFs that attract inflows from both small-cap rallies and market-cap diversification allocation money. Inflows can also be pronounced during rate-cut phases or when risk appetite recovers.

Its main strengths are an ultra-low expense ratio and broad stock diversification, while small-cap volatility and interest-rate sensitivity are drawbacks to consider in advance.

Among the funds shown in the table, IJR and SPSM are direct substitutes tracking the S&P SmallCap 600 with a profitability screen, IWM and VTWO are variants tracking the Russell 2000, and SCHA is a variant tracking Schwab's small-cap index. To add mid caps, VO and IJH are suitable pairings. For combining with a large-cap core, consider VOO and IVV, and for broad market exposure, VTI is a fitting combination.

Here are the points to review before investing in VB. Broad small-cap diversification is a strength, but small-cap volatility, the absence of a profitability filter, and currency effects are worth rechecking before buying, along with your holding weight and market-cap diversification strategy.

Small-cap volatility, the absence of a profitability filter, and exchange rate fluctuations are the main drivers of short-term volatility. When credit spreads widen, drawdowns can be larger than in core ETFs, so it is worth also considering how to split weightings with a large-cap core.

It is regarded as a standard choice for long-term, broadly diversified US small-cap exposure. For exposure with a profitability screen, IJR and SPSM are suitable alternatives, for Russell 2000 tracking, IWM and VTWO, and for broad market exposure, VTI.