Why Smart Investors Are Shifting From SPY to SPMO’s Momentum Play

Most investors start with SPY because it's the simplest, cheapest option. With a 0.03% expense ratio, it's the default low-cost gateway to the entire S&P 500. You buy it, and you're done. But that simplicity comes with a hidden risk: SPY's performance is now heavily tied to a few mega-cap tech giants. And those giants have recently been under pressure. As of this writing, the tech sector is in the red for the year. A sign that the relentless rally of the "Magnificent Seven" may be cooling.

The problem is that SPY is a cap-weighted index. It simply gives more weight to the companies with the biggest market values. When those mega-cap stocks falter, the entire fund feels the drag. This creates a kind of default trap-investors stick with the familiar, low-cost choice, but they may be missing out on stronger performers elsewhere in the same index.

There's a smarter alternative built from the same pool of 500 stocks: the Invesco S&P 500 Momentum ETF (SPMO). It doesn't pick different companies; it picks the ones that have been winning the hardest. SPMO ranks all S&P 500 stocks by their recent upward trend and builds a portfolio around the strongest performers. The fund reconstitutes twice a year, rotating out of fading leaders and into the new ones. This systematic tilt means it's often overweight in sectors like technology and financials when momentum is strongest in those areas.

The result is a clear performance gap. Over the past year, SPMO has returned 24% compared to SPY's 16%. That's a 8-percentage-point advantage. The cost? SPMO's 0.13% expense ratio is only 0.10% higher than SPY's. For most investors, that extra cost is a small price to pay for consistently beating the market's default option. The bottom line is that SPY's simplicity can be a liability when the biggest names stumble. By focusing on momentum, SPMO offers a way to stay in the S&P 500 while chasing the stocks that are actually driving the market right now.

The Small-Cap Opportunity: Simple Strategies, Strong Returns

The story for small-cap stocks is clear: they are outperforming. The Russell 2000 index, which tracks about 2,000 of the smallest publicly traded U.S. companies, is up 8% in 2026 while the S&P 500 has gained just 1.4%. That's a powerful rotation into smaller, more domestically focused businesses. The setup is simple. These companies are less exposed to global trade wars and currency swings, and they are benefiting from a U.S. policy tailwind aimed at domestic industries. When the market's focus shifts from mega-cap tech to broader economic growth, small caps often lead the charge.

This isn't just a broad index story. Specific ETFs are capturing this momentum with clear, straightforward strategies. Think of them as different ways to pick the most promising local businesses.

First, consider the Invesco S&P SmallCap 600 Revenue ETF (RWJ). Its strategy is pure sales focus. It targets companies with the strongest top-line growth, like betting on a proven sales team that consistently brings in new customers. This year, RWJ is up 11.6%, a direct result of that sales-driven approach.

Then there's the Pacer US Small Cap Cash Cows Growth Leaders ETF (CAFG). This fund looks for companies that are already profitable and generating reliable cash flow. It's the "cash cow" approach-investing in businesses that not only grow but also pay their way, building a solid financial foundation. CAFG is up 9.4% this year, showing the strength of combining growth with financial discipline.

For a more rule-based, multi-pronged strategy, look at the John Hancock Multifactor Small Cap ETF (JHSC). It uses a simple checklist combining value, quality, and momentum. It's like hiring a manager who checks off three boxes: the stock isn't overpriced, the business is well-run, and it's trending upward. JHSC is up 8.9% so far.

Finally, the Invesco S&P SmallCap 600 Pure Growth ETF (RZG) is a focused bet on explosive growth. It concentrates on companies with high growth rates, showing the power of a single-minded strategy. RZG is up 8.5% this year, a strong return for a pure growth tilt.

The bottom line is that small-cap ETFs offer a range of plain-English strategies to ride this rotation. They provide a way to diversify beyond the mega-cap giants and tap into the engine of domestic economic activity. For investors, that's a simple, powerful alternative to the default.

The Business Logic: Why Small Caps Are in Favor

The recent outperformance of small caps isn't just a market whim; it's being driven by clear, fundamental advantages. Three key factors are aligning to make this a compelling investment case.

First, the earnings outlook is dramatically better. While the entire market is expected to grow, smaller companies are set to lead the charge. Consensus forecasts show the Russell 2000, a benchmark for small caps, is on track for 43% year-over-year earnings growth over the coming year. That's more than triple the expected growth for the S&P 500. This isn't a one-off spike. After a downturn in 2023 and 2024, earnings are now inflecting higher, and for a market where earnings were a key driver of returns in 2025, this sets the stage for further share price gains.

Second, valuations are far more reasonable. The market is paying a premium for large-cap growth, but it's not extending the same generosity to smaller firms. The S&P 600, a quality small-cap benchmark, trades at roughly 15.5–16.0x earnings. That's a significant discount to the S&P 500's multiple, which sits well above its historical average. This valuation gap leaves small caps at an attractive entry point, especially when paired with their superior growth prospects.

Finally, the macroeconomic tailwind is a direct benefit for smaller, more leveraged businesses. Since September 2024, the Federal Reserve has been cutting interest rates. For small-cap companies, which typically carry more variable-rate debt, this means lower borrowing costs flow through quickly as reduced interest expense. This helps boost their bottom lines and supports the operational efficiencies that are already driving margin expansion. It's a simple rule of thumb: when rates fall, the companies that need to borrow more to grow often see the biggest relief.

Put these together, and the logic is straightforward. Small caps offer explosive earnings growth at a discount, while also benefiting from a policy environment that eases their financial burden. This combination of strong fundamentals and favorable conditions is what's fueling the current rotation and making targeted small-cap strategies a smart diversification move.

Practical Takeaways: When to Consider and How to Diversify

So, when does this small-cap rotation make sense for your portfolio? The simple answer is when you want exposure to domestic growth and value, especially if you believe the mega-cap tech rally is overextended. The evidence shows a clear rotation already underway, with the Russell 2000 up 8% in 2026 while the S&P 500 has barely budged. That's a powerful signal that the market is rotating away from the few dominant giants and toward a broader base of U.S. businesses.

Your diversification strategy should be straightforward. Think of it as a two-part allocation. First, use a simple rule: dedicate a portion of your equity portfolio to a broad small-cap index fund like the Vanguard Russell 2000 ETF (VTWO). This gives you a low-cost, balanced stake in the entire small-cap universe, capturing the sector's overall momentum. Second, allocate another portion to a targeted ETF that follows a specific, proven strategy. For example, you could add the Invesco S&P SmallCap 600 Revenue ETF (RWJ) for pure sales growth or the Pacer US Small Cap Cash Cows Growth Leaders ETF (CAFG) for businesses that are both growing and profitable. This approach combines the safety of a broad market bet with the potential for outperformance from a focused tilt.

The key to managing this position is to watch for two things. First, monitor the quarterly earnings reports from small-cap companies. The explosive 43% year-over-year earnings growth forecast is the engine driving this rally. If that growth falters, the momentum could cool. Second, keep an eye on the Federal Reserve. The bank's continued monetary easing is a direct tailwind, lowering borrowing costs for these more leveraged businesses. Any shift in the Fed's stance, especially a pivot toward tighter policy, would be a red flag for the sector.

In short, small caps offer a clear diversification path when the market's focus shifts from a handful of giants to the engine of domestic economic activity. By using a simple two-fund approach and watching earnings and policy, you can participate in this rotation without overcomplicating your portfolio.