The iShares S&P SmallCap 600 ETF (ASX: IJR) gives Australians exposure to smaller US companies — the domestically focused businesses that sit well below the mega-cap technology giants dominating headlines. After years in which a handful of large US companies drove returns, some investors are watching whether US small caps can finally join the rally.

In September 2026, with US mega-cap valuations elevated and the market debating whether Leadership will broaden, IJR offers a way to access the smaller end of the US market. This article explains how IJR works, why it is in focus, and the catalysts and risks that could shape it from here.

What is the IJR ETF?

IJR is a passive ETF issued by BlackRock under its iShares brand. It aims to track the S&P SmallCap 600 Index, before fees and expenses — a benchmark of around 600 smaller US companies that meet certain size, Liquidity and, importantly, profitability criteria. The fund gives Australian investors access to US small caps in a single ASX trade, is currency-unhedged, and tracks the same index as its large US-listed counterpart. Its portfolio spans financials, industrials, technology, consumer and other sectors.

A distinctive feature of the S&P SmallCap 600 is its profitability screen: to be included, companies must have a track record of positive earnings. This sets it apart from some other small-cap indices that include unprofitable companies, and it gives IJR a quality tilt within the small-cap universe. Small caps as a group tend to be more domestically focused, more cyclical and more sensitive to the economic cycle than large caps, so IJR behaves quite differently from a mega-cap or broad US fund. For Australian investors, the unhedged currency exposure adds a further variable.

What is driving interest now?

The central theme is market breadth. US returns have been dominated by a small group of mega-cap technology companies, leaving smaller companies behind. Some investors are watching for a broadening of the rally — a rotation in which smaller, more domestically focused companies catch up — which would benefit small-cap funds like IJR. With mega-cap valuations elevated, the case for looking further down the market has drawn attention.

Small caps are also economically sensitive. Because they tend to be more domestically focused and more cyclical, they are influenced heavily by US economic growth, interest rates and financial conditions. Lower rates and solid growth tend to favour small caps, while tighter conditions can weigh on them. The US Federal Reserve’s more hawkish stance in 2026 is therefore a key consideration. The profitability screen in the S&P SmallCap 600 gives IJR some quality protection, but it remains a cyclical, economically sensitive exposure.

Portfolio and holdings

IJR’s portfolio is broadly diversified across around 600 smaller US companies, with no single stock dominating. Its sector exposure has historically been led by financials, industrials, technology and consumer cyclicals, with meaningful weightings to healthcare and real estate — a very different mix from the technology-dominated mega-cap indices. This breadth means the fund is a genuine bet on the smaller end of the US market rather than a few large names.

The most important features for investors are the small-cap focus and the profitability screen. The small-cap focus gives IJR exposure to more domestically focused, cyclical companies that behave differently from mega-caps. The profitability requirement gives it a quality tilt, tending to exclude the unprofitable, speculative companies that can populate the small-cap universe. Investors should understand that IJR is a diversified, quality-tilted small-cap fund whose fortunes depend on the US economic cycle and on whether market leadership broadens.

Catalysts to watch

Several factors could influence IJR in the coming months: whether US market leadership broadens from mega-caps to smaller companies; US economic growth and the health of the domestic economy; US Federal Reserve policy and interest rates, to which small caps are sensitive; the Earnings of smaller US companies; and the AUD/USD Exchange Rate for unhedged returns.

Risks

IJR carries the risks of small-cap investing. Small-cap risk means its holdings can be more volatile, less liquid and more sensitive to the economic cycle than large caps. Economic-sensitivity and interest-rate risk are significant, since small caps are affected by US growth and financial conditions. Currency risk is unhedged. Sector exposure to financials, industrials and cyclicals adds cyclicality. Market Risk and general geopolitical risks apply. Although the profitability screen provides some quality protection, small caps can fall sharply in downturns.

Outlook

IJR offers Australians a diversified, quality-tilted way to access US small caps, an area that has lagged the mega-cap-led market. Its near-term fortunes rest on whether market leadership broadens, on US economic growth, and on interest rates. Investors may be watching US market breadth, the economy, Fed policy and the Australian dollar for direction. The outlook may depend on whether the rally broadens beyond the mega-caps to smaller companies, which is what would most benefit a fund like IJR, and on the health of the US economy to which small caps are closely tied.