Mind the Gap: ETF Investors Missed $3.8 Trillion

ETF and fund investors gave up $3.8 trillion over the past decade to poorly timed trading, Morningstar research shows. That gap, the difference between what funds actually returned and what investors earned, is a number that advisors can help shrink. Key Takeaways: ETF and fund investors lost $3.8 trillion over a decade to poorly timed trades, not weak performance. Liquidity cuts both ways: ETFs out-earned open-end funds but carried wider investor return gaps. Buffer ETFs curbed timing mistakes; crypto ETFs suffered the widest gap between total and investor returns. Jeffrey Ptak, a managing director at Morningstar, authored the Mind the Gap 2026 study. Morningstar found that the average dollar invested in U.S. funds and ETFs earned 8.7% annually over the decade ending in 2025. This figure trailed the funds’ 9.9% aggregate total return over the same period. The 1.2 percentage point shortfall, which Morningstar calls the investor return gap, equals roughly 12% of the funds’ total return. It stems from the timing and size of investors’ own trades rather than weak fund performance. As of Jan. 1, 2016, eligible funds held $13.6 trillion in assets, according to the report. Left untouched, that money would have grown to nearly $35 trillion by the end of 2025. Instead, those assets totaled $29.7 trillion, the report found. Poorly timed buying and selling can explain most of the shortfall. However, not every category told the same story. U.S. stock fund investors captured 12.8% annually against a 13.3% total return, a gap of just 0.4 percentage points. Morningstar called it the most profitable decade in fund history for the category. Those investors started with $5.8 trillion in assets at the beginning of 2016. Comparatively steady flows helped those gains compound to more than $12 trillion. For advisors, the findings build a case for the structural guardrails that many already recommend. These include; automated rebalancing, core allocation strategies, and outcome-oriented products designed to keep clients from acting on impulse. Where the Gap Widens The gap tended to widen wherever trading came easiest. ETFs earned higher dollar-weighted returns than open-end funds over the decade, 9.5% annually versus 8.5%, Morningstar found. But that liquidity came at a cost. The gap for ETFs was 1.6 percentage points — wider than the 1.2-point gap for open-end funds. Management style and fees mattered less than advisors might expect, the study found. Active fund investors earned 7.5% annually — 1.6 points behind their funds’ total return. Index fund investors earned 10.3% — a narrower 1.1-point gap. Fees showed an even weaker link to investor success. The cheapest funds carried a 1.0-point gap, versus 1.2 points for the priciest funds, according to the report. Volatility proved to be the stronger predictor. The study found that the least volatile funds posted a 0.4-point gap over the decade. The most volatile quintile suffered a gap of more than 2 percentage points. Investors in calmer funds kept nearly all of their gains; those in choppier funds gave much of theirs back. New ETF Structures, New Behavior Gaps This year’s study also examined three newer ETF types: buffer ETFs , leveraged single-stock ETFs and crypto ETFs . Together, they drew $165 billion in combined inflows over the past five years, Morningstar reported. The results diverged sharply. Buffer ETFs Buffer ETFs use derivatives to target returns within a set range over a defined period. They were the standout in this year’s study. Dollar-weighted returns exceeded aggregate total returns over both the three- and five-year periods ended Dec. 31, 2025. Flows clustered around each fund’s outcome window, according to the report. Investors also caught favorable timing in 2022, when losses hit hardest in the first half of the year. Buyers of funds tied to la...