Not every investor approaches the stock market by simply buying the largest companies and holding them indefinitely. Some investors are interested in momentum investing, a strategy based on the idea that stocks demonstrating strong price performance may continue to outperform for periods of time. The SPMO ETF takes this concept and applies it to companies within the S&P 500.
But what exactly does SPMO do, and how is it different from a traditional S&P 500 ETF?
What Is the SPMO ETF?
SPMO is the ticker symbol for the Invesco S&P 500 Momentum ETF.
The fund is designed to track the S&P 500 Momentum Index. Rather than owning every S&P 500 company in a traditional market-cap-weighted approach, the strategy focuses on companies with stronger momentum characteristics.
According to Invesco, the fund generally invests at least 90% of its assets in securities that make up the underlying index. The index focuses on S&P 500 stocks with high momentum scores.
This creates an important distinction:
SPMO is not simply another S&P 500 ETF.
It uses a rules-based factor strategy to emphasize stocks showing stronger momentum.
How Does the SPMO Strategy Work?
Momentum investing attempts to identify stocks that have demonstrated relatively strong performance compared with other stocks.
The theory behind the strategy is relatively straightforward: securities that have performed strongly may continue to show strength for some time.
Of course, momentum is not guaranteed to continue.
Markets can change quickly, and stocks that have recently performed well can experience sharp reversals.
SPMO’s rules-based methodology is designed to systematically adjust its holdings rather than relying on a manager to make individual discretionary stock selections.
SPMO Rebalances Twice a Year
One detail that makes SPMO particularly interesting is its rebalancing schedule.
The underlying S&P 500 Momentum Index is reconstituted and rebalanced twice a year, on the third Fridays of March and September.
That matters because momentum rankings can change as stock prices and market trends change.
A company that looks strong under the strategy today may not have the same momentum characteristics at the next review.
This can result in changes to the fund’s holdings and weights.
What Stocks Does SPMO Hold?
SPMO focuses on companies from the S&P 500 that meet its momentum criteria.
Because the strategy is factor-based, its portfolio can look quite different from a standard S&P 500 fund.
The difference can become particularly noticeable during periods when a small group of stocks is driving market performance.
If certain large companies demonstrate strong momentum, a momentum strategy can give them significant influence.
That can be beneficial when the trend continues—but it can also increase concentration and reversal risk.
SPMO Expense Ratio
According to Invesco’s latest available fund data, SPMO has a 0.13% total expense ratio. The same report listed 99 holdings as of December 31, 2025. The expense ratio is only one part of the evaluation process. Investors should also consider the strategy’s turnover, concentration, performance across different market environments, and how it interacts with other holdings.
Why Momentum Investing Can Be Attractive
Momentum strategies can appeal to investors who want exposure to stocks showing stronger relative price trends. Imagine a market in which certain industries are consistently outperforming others. A traditional broad-market ETF will continue to hold companies according to its own index methodology, regardless of short-term momentum. A momentum strategy, however, attempts to tilt toward stocks demonstrating stronger momentum characteristics. This can potentially help during prolonged market trends. But the same feature creates a weakness. When market leadership changes quickly, momentum strategies can face difficult periods.
SPMO vs. a Traditional S&P 500 ETF
The easiest way to understand SPMO is to compare it with a conventional S&P 500 fund. A traditional S&P 500 ETF seeks to represent the broader S&P 500 according to its index methodology. SPMO takes a different approach. Instead of treating the S&P 500 as one broad basket, it applies momentum criteria to identify stocks with stronger momentum characteristics. This means the two funds can have substantially different portfolios and risk profiles.
An investor choosing between them should therefore ask:
- Do I want broad S&P 500 exposure?
- Do I specifically want a momentum factor?
- Can I tolerate greater concentration?
- How would the fund fit with my existing investments?
- Am I comfortable with periods of momentum reversal?
These questions can be more useful than simply comparing which fund had the highest return during one particular period.
What Happens When Momentum Reverses?
Momentum strategies have a built-in vulnerability. Suppose a group of technology or growth stocks has been outperforming the market for months. A momentum strategy may have significant exposure to those stocks. Then the market suddenly rotates into another sector.
The stocks that previously led the market may fall while previously weaker sectors begin outperforming. That reversal can hurt momentum-focused strategies. This is why SPMO should not be viewed as a guaranteed way to outperform the S&P 500. It is better understood as a specific factor strategy with both potential advantages and risks.
Potential Benefits of SPMO
Investors researching SPMO may find several features attractive:
Rules-Based Strategy
The fund follows an index methodology instead of relying on a traditional active stock-picking manager.
Focus on Momentum
SPMO provides targeted exposure to stocks exhibiting stronger momentum characteristics.
Access to Large U.S. Companies
The strategy starts with companies in the S&P 500 universe.
Portfolio Diversification
Although more concentrated than a broad-market approach, the ETF still provides exposure to multiple companies rather than just one stock.
Transparent Methodology
The index rules help investors understand the basic reason securities enter or leave the strategy.
Risks Investors Should Understand
SPMO’s momentum focus can create risks that investors need to recognize.
Factor Risk
Momentum can underperform other investment factors for extended periods.
Concentration Risk
The portfolio can become heavily influenced by stocks or industries showing strong momentum.
Market Reversal
A rapid change in market leadership can hurt momentum strategies.
Valuation Risk
Strong momentum can sometimes push investors toward stocks with elevated valuations.
Tracking and Trading Costs
Although the fund has a relatively low stated expense ratio, investors should also consider bid-ask spreads, taxes, and the broader costs of trading.
Is SPMO Suitable for Every Investor?
No single ETF is appropriate for everyone. SPMO may be more interesting to investors who understand factor investing and specifically want momentum exposure. It may not be the best choice for someone who simply wants a straightforward core holding representing the broad U.S. stock market.
One possible approach is to view factor ETFs as a portfolio component, rather than assuming they must replace broad-market investments. The important step is understanding what role the ETF is supposed to play.
Final Thoughts
SPMO provides a different way to approach large-cap U.S. stocks.
Instead of simply following the broader S&P 500, it focuses on companies demonstrating stronger momentum characteristics through a rules-based index strategy. Invesco says the underlying index is rebalanced twice a year, making the strategy responsive to changes in momentum over time.
That can make SPMO interesting during strong market trends, but it also means investors need to understand the possibility of momentum reversals and periods of underperformance.
For anyone comparing ETFs, the most useful question is not simply “Which ETF performed best?” A better question is: “Which strategy fits my goals, risk tolerance, and existing portfolio?”
Readers who want to explore more ETF topics can also visit the ETF Guides & Analysis category for additional educational resources and fund analysis.
This article is for educational purposes only and is not financial, investment, tax, or legal advice.
