The launch of federally seeded child investment accounts, informally dubbed “Trump Accounts,” has parents scrambling to pick a single ultra-low-cost equity ETF to hold for 18 years. Two names dominate the shortlist: the State Street SPDR Portfolio S&P 500 ETF (SPYM) and the Vanguard Total Stock Market ETF (NYSEARCA:VTI). They look nearly identical on paper. They have behaved very differently, and the gap compounds over a childhood.
A quick note on the policy: public materials describe Trump Accounts as tax-advantaged custodial accounts that can hold low-cost, diversified U.S. equity index funds. Both SPYM and VTI clear that bar. Parents should confirm eligible fund menus with their account custodian rather than assume any single ETF is a mandated default.
What each fund is actually betting on
SPYM tracks the S&P 500. That is a committee-curated list of roughly 500 profitable U.S. large caps, heavily weighted toward the mega-cap technology names that have driven the market since 2015. Owning SPYM is a bet that the largest, most dominant American companies keep compounding earnings faster than everything below them.
VTI tracks the CRSP U.S. Total Market Index, which holds roughly 3,600 stocks spanning large, mid, small, and micro caps. Owning VTI is a bet that the full American economy, including the mid-cap industrials and small-cap growth names outside the S&P 500, delivers returns at least as good as the megacaps over the long run. It is a broader, more academically “pure” equity exposure.
Where the difference has shown up
The mega-cap era has punished breadth. Over the past 10 years, SPYM returned 320.79% while VTI returned 243.45%. Over five years, SPYM gained 84.37% against VTI’s 63.7%. In the trailing year, SPYM advanced 21.5% while VTI added 20.7%.
The gap widens as you go back further because small and mid caps lagged sharply through the 2022 rate shock and never fully recovered leadership. If that regime persists for another 18 years, SPYM wins. If interest rates normalize lower and capital rotates back toward smaller companies, VTI’s roughly 3,100 extra holdings become the tailwind. Historically, small caps have led coming out of deep recessions, which is exactly the environment a long-dated child account could see more than once.
The practical comparison
| Factor | SPYM | VTI |
|---|---|---|
| Expense ratio | 0.02% | 0.03% |
| Holdings count | ~500 | ~3,600 |
| Exposure | Large-cap U.S. | Total U.S. market |
| Current price | $87.67 | $368.76 |
| 10-year total return | 320.79% | 243.45% |
The one-basis-point fee edge for SPYM is real but negligible on a $1,000 seed contribution. The share price difference matters more for parents adding small monthly amounts, since SPYM’s lower per-share price allows tighter dollar-cost-averaging without fractional shares.
The verdict
For a Trump Account with an 18-year horizon, SPYM is the more efficient bet on what has actually worked, concentrated ownership of the most profitable American companies at rock-bottom cost. VTI is the better choice for parents who believe small and mid caps are due for a decade-long comeback and who want that exposure baked in automatically. If a parent already plans to hold other broad index funds in retirement accounts, SPYM’s cleaner large-cap tilt is easier to manage. If the Trump Account is the child’s only equity exposure for years, VTI’s breadth is the more prudent single-fund solution.
Contact [email protected] for any questions or corrections.
Top Gaining Stocks
Top Losing Stocks