BOXX vs MMK
Alpha Architect 1-3 Month Box ETF against State Street Prime Money Market ETF: cost, size, returns, what they hold and how much of it is the same.
Fee gap
1 bp
MMK is cheaper
1-year return gap
—
Larger fund
BOXX
$12.7B
Side by side
| BOXX | MMK | |
|---|---|---|
| Fund | Alpha Architect 1-3 Month Box ETF | State Street Prime Money Market ETF |
| Issuer | Alpha Architect | State Street SPDR |
| Category | Ultra-Short Bond | Ultra-Short Bond |
| Expense ratio | 0.19% | 0.18% |
| Assets | $12.7B | $32M |
| Average daily dollar volume | $450M | $203K |
| Listed | Dec 27, 2022 | Feb 11, 2026 |
| FrenzyCap score | 67 | 43 |
| 1-month return | +0.4% | 0.0% |
| 3-month return | +1.0% | +0.0% |
| Year to date | +3.1% | — |
| 1-year return | +4.0% | — |
| 30-day volatility | 0.4% | 0.9% |
| Worst drawdown, 1 year | −0.1% | −0.3% |
| Trailing 12-month yield | — | 2.30% |
| Holdings | 8 | 72 |
| Top 10 weight | 100.0% | 13.1% |
| Look-through P/E | — | — |
| Holdings vs fair value | — | — |
| Holdings above 200-day average | — | — |
| Net flow, latest 3 reported months | +$2.0B thru Jun 2026 | — |
| 30-day implied volatility | — | — |
| Holdings as of | as of Jun 30, 2026SEC filing | as of Oct 20, 2026issuer data |
Returns are price returns and exclude distributions. Flows are each fund's own latest reported months and may not cover the same period.
More: full overlap table · BOXX holdings · MMK holdings
Fund data comes from each fund's SEC filings and issuer disclosures and is shown with the date it is as of. SEC portfolio and flow filings become public about 60 days after the period they cover. Nothing here is investment advice; see Terms.