The fund tracks the S&P SmallCap 600 Momentum Index, holding the 120 stocks with the highest momentum scores among SmallCap 600 constituents, weighted by market capitalization. Holdings can change substantially at each semiannual rebalancing.

It suits investors who want concentrated exposure to the small-cap momentum factor, particularly active investors looking to take advantage of high-volatility growth phases.

Invesco launched this passive (index-tracking) ETF in 2005.

The index calculates a momentum score for each S&P SmallCap 600 constituent, based on its trailing 12-month return (excluding the most recent month) adjusted for volatility. It then selects the top 120 stocks and holds them weighted by market capitalization. Turnover at each semiannual rebalancing is quite high, so the fund actively reflects trends within small caps.

• Concentrated factor exposure, narrowed to the top 120 momentum stocks among small caps
• A volatility-adjusted momentum score offers a risk-adjustment benefit compared with a simple return ranking

Assets under management (AUM) stand at $2.9B, and the Expense Ratio is 0.35% per year.

Compared with the small-cap ETF IWM, it holds far fewer stocks and is more concentrated because of the momentum filter. The strategy aims for outperformance during trending markets, but volatility tends to be large when trends reverse.

The small-cap momentum factor tends to perform relatively strongly when risk appetite rises across the market, and it adds the high volatility typical of small caps on top of what a large-cap momentum index carries. When interest rates rise, the debt burden of small companies comes into focus and performance can slow.

Small-cap momentum strategies tend to see notable inflows during risk-on phases. When market uncertainty grows, money can shift toward large caps or defensive ETFs, leading to relative weakness. Short-term supply and demand swings may occur around the semiannual rebalancing.

A concentrated strategy in high-momentum small caps has the potential for excess returns in growth phases, but the high volatility typical of small caps and the fee level are drawbacks.

Among the products shown in the table, MTUM is a large- and mid-cap momentum strategy, and SPMO is an ETF that tracks the top momentum stocks within the S&P 500, making it more large-cap focused than XSMO. XMMO has a similar structure, extracting momentum from the S&P MidCap 400's mid-cap universe, though this fund draws on the S&P MidCap 600 per the source. JMOM is J.P. Morgan's multifactor momentum strategy, and VFMO is Vanguard's factor momentum ETF, spanning all market-cap ranges. For broad small-cap exposure, you can also compare IWM, and for a blend of small-cap value and momentum, SMLF.

Here are the points to review before investing in XSMO. Small-cap momentum factor strategies show wide performance gaps depending on market trend phases and tend to be highly volatile, so it is important to check fees, liquidity, and risks in advance.

The combination of small-cap concentration and the trend dependence of the momentum factor can amplify volatility during market transitions. Changes in interest rates and risk appetite directly affect performance.

It is a suitable choice for investors who want concentrated exposure to the small-cap momentum factor. If broad small-cap exposure is the goal, we recommend comparing it with IWM, and if cost efficiency is the priority, with SMLF.