What Is DFAS? Dimensional U.S. Small Cap ETF

A top holding of 0.4% is unusual even among small-cap funds. It means that a company doubling or halving in price changes the fund's value by a fraction of a percent. The ten largest positions, taken together, still come to only about 3.1%. Whatever happens to DFAS happens because a large group of small companies moved in the same direction, never because one of them did.

This is Dimensional's approach applied consistently. Rather than picking companies, the firm defines an eligible universe and then weights it with adjustments for relative price and profitability, screening out the most speculative and least profitable end of the small-cap market. The fund is legally active, since it follows no published index, but it behaves much more like a broad market sweep than like a stock-picking mandate.

One practical benefit of holding rather than tracking: the fund is not forced to trade on an index reconstitution date alongside every other fund following the same list. That flexibility on timing is a large part of why Dimensional runs its funds without a benchmark in the first place.

The names at the top of the fund are a useful corrective to the idea that small-cap investing is a domestic, unglamorous corner of the market. TTM Technologies makes printed circuit boards. Amkor packages and tests semiconductors. Onto Innovation makes process control equipment for chip fabrication. Advanced Energy supplies power systems to semiconductor manufacturing tools. Sanmina is a contract electronics manufacturer.

Five of the ten largest positions sit somewhere in the semiconductor supply chain. Technology is 15% of the fund overall, behind financials at 20% and industrials at 19%, but the composition of that technology sleeve means the fund carries real exposure to global capital spending on chip manufacturing. That cycle is not correlated with the domestic US economy in the way people often assume small caps are.

The other sectors behave more conventionally. Financials at 20% in a US small-cap fund is mostly regional and community banks, which are sensitive to interest rates, deposit competition and regional property lending in ways that large money-centre banks are not. Healthcare at 13% brings a different profile again, since small healthcare companies range from profitable device makers to firms dependent on a single product approval.

At 0.26%, DFAS is more expensive than the cheapest passive small-cap index funds and much cheaper than traditional active small-cap management. The premium over an index fund pays for the profitability and price screens and for the trading flexibility. Neither is guaranteed to produce anything, and both can look like drag for long stretches when speculative small caps lead the market, since those are precisely the companies the screens reduce.

The 0.96% yield is modest and incidental. Small companies reinvest more and distribute less, so anyone reaching for income will find both the level and the reliability lacking here.

The fund is a poor fit as a first equity holding, since small caps are a satellite rather than a core in most portfolios. It also overlaps considerably with any other broad US small-cap fund, so holding two adds fee lines without adding companies. Someone who specifically wants deep-value small caps or micro caps will find DFAS too broad, since it deliberately spans the whole small-cap range rather than concentrating on one corner of it.

Approximate weights as of August 2026. Each ticker links to its individual stock guide in Walnut.

There are three common ways to get DFAS exposure. Buy shares (or fractional shares) of DFAS directly at any major broker that lists it. Hold it as a core position and layer more concentrated ideas on top. Or build it into a thematic portfolio in Walnut, so DFAS sits alongside other holdings that express the same thesis, with target weights you can rebalance toward. DFAS trades like a stock during market hours, so you buy it the same way you would any listed share.

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Whether DFAS is a good buy depends less on any single call and more on your time horizon and what you already hold: it tracks Actively managed, no tracked index, so the real question is whether you want that exposure in your mix and at what weight. We walk through valuation, concentration, and what would have to be true for it to outperform from here in is DFAS a buy?

DFAS gives you Actively managed, no tracked index exposure in one ticker at a 0.26% expense ratio. Most investors use it as a core holding and layer more concentrated thematic portfolios on top.

Whether DFAS is worth buying today depends more on your time horizon and what you already hold than on any single call. We walk through valuation, concentration, and what would have to be true for it to outperform from here in is DFAS a buy?

DFAS yields 0.96% as of August 2026, paid by passing through the dividends of its underlying holdings. For the payout schedule, history, and how the distributions are taxed, see DFAS dividend: yield and schedule.

New to funds like DFAS? Start with what an ETF is, then how to buy an ETF, or browse the full guide to ETF investing.