What are exchange-traded funds (ETFs) and how do they operate?

Exchange-traded funds (ETFs) are pooled investment funds that trade on stock exchanges, much like individual stocks. They track a basket of assets, such as stocks or bonds, allowing investors to gain diversified exposure to a specific market segment without buying individual securities. Investors can buy or sell ETF shares throughout the trading day at fluctuating prices based on supply and demand. This structure offers flexibility, often lower costs compared to mutual funds, and transparency, as most ETFs disclose their holdings daily. ETFs are commonly used to target broad markets, sectors, commodities, or specific investment styles.

What does it mean when an ETF tracks an index?

Tracking an index means the ETF aims to replicate the performance of a specific market segment by holding the same securities or a representative sample of them, usually in proportion to their weight in the index. For instance, an ETF tracking a small-cap index would invest in smaller companies, mirroring the index's composition. Passive index tracking typically results in lower fees than active management, where a fund manager tries to outperform the market. Investors choose ETFs that align with their desired exposure, such as growth or value styles, while understanding the ETF will mirror the index's movements rather than beating it.

What is a dividend yield and why does it vary between funds?

A dividend yield represents the annual payout a fund distributes to shareholders, expressed as a percentage of its current share price. For instance, a fund with a £100 price paying £2 annually has a 2% yield. Dividend yields vary across funds due to differences in holdings; for example, IWM has a yield of 0.96% compared to IWO's 0.46%. Growth stocks typically offer lower or no dividends, prioritising capital appreciation. Investors should consider both yield and potential price appreciation when evaluating funds, as yields are not guaranteed and can fluctuate with market conditions.

How do the expenses of IWM and IWO compare?

IWM has an expense ratio of 0.19%, meaning it charges £19 annually per £10,000 invested. IWO, with a 0.24% expense ratio, charges £24 for the same amount. While the 0.05 percentage point difference may seem minor, it can significantly impact long-term returns due to compounding. For example, on a £10,000 investment, IWM's costs are 20% lower annually. Over decades, such savings allow more capital to grow. Investors should evaluate fee structures alongside other factors like holdings and strategy. Lower expenses do not guarantee superior performance, but they reduce the cost hurdle funds must overcome.

What are the key holdings of these two ETFs?

IWM's top holdings include TWST (0.36%), MOG.A (0.34%), HUT (0.33%), FROG (0.33%), and UMBF (0.33%). IWO's leading positions are TWST (0.72%), MOG.A (0.68%), FROG (0.66%), BTSG (0.62%), and GKOS (0.62%). While both include TWST and MOG.A, IWM's more diversified small blend approach results in smaller individual holding weights, such as HUT and UMBF. IWO's growth focus amplifies specific stocks like BTSG, GKOS, and FCFS, leading to higher concentration in top holdings. Investors should assess how individual company exposure aligns with risk preferences and the ETF's overall portfolio diversification.

How do the dividend yields of IWM and IWO compare?

IWM offers a dividend yield of 0.96%, while IWO yields 0.46%. This difference reflects their distinct strategies: IWM includes value and growth companies, many paying regular dividends, while IWO focuses on growth firms that often reinvest profits to boost share prices, reducing cash payouts. For instance, IWM’s holdings like UMBF contribute to its higher yield. Investors seeking income might prefer IWM, but should also consider its lower growth potential. Yields can vary with market conditions, so evaluating past performance alongside future expectations is important when selecting funds.

How do the fund sizes of IWM and IWO affect liquidity?

IWM's massive £77.2 billion asset base ensures very high liquidity, meaning traders can buy or sell shares quickly without significantly impacting the price. In contrast, IWO is smaller at £14.2 billion, but this still provides adequate liquidity for most retail investors. A larger fund typically has tighter bid-ask spreads, reducing hidden trading costs. While IWO is sufficiently liquid for long-term investing, traders executing large orders might favour IWM for its deeper order book and more frequent trading volumes, potentially minimising slippage. Investors should balance the desire for specific growth exposure with the practical benefits of larger, more liquid funds for easier entry and exit.

What market segment does IWM cover?

IWM targets the small-cap 'blend' segment, offering diversified exposure to smaller companies across both growth and value profiles. With net assets of $77.2 billion and a dividend yield of 0.96%, it provides a comprehensive snapshot of the broader small-cap landscape, featuring relatively low individual holding weights. In contrast, IWO, with $14.2 billion in assets and a 0.46% yield, focuses strictly on small-cap growth firms. While IWM aims for balanced exposure, IWO pursues capital appreciation during economic expansions. The blend strategy may perform differently than pure growth during market shifts.

What is the market focus of IWO?

IWO focuses on small-cap growth stocks, specifically those in the Russell 2000 universe, with net assets of $14.2 billion. It tracks an index aimed at capital appreciation during economic expansions, though the specific index name is not available in our data. Compared to IWM's small blend strategy, IWO offers more concentrated exposure to growth-oriented firms. Both funds launched around mid-2000, but IWO's 0.24% expense ratio is higher than IWM's 0.19%. Investors seeking growth might find IWO suitable, whereas IWM provides broader diversification with a 0.96% yield versus IWO's 0.46%.

What is the trading liquidity of IWM and IWO?

IWM benefits from massive liquidity due to its substantial $77.2 billion asset base, facilitating tighter bid-ask spreads and efficient trade execution. This makes it ideal for large investors or active traders seeking minimal market impact. IWO, while smaller with $14.2 billion in assets, still provides adequate liquidity for most retail investors. Although IWM offers cost advantages via its 0.19% expense ratio compared to IWO's 0.24%, IWO’s smaller size might lead to slightly wider spreads during volatile periods. Investors should choose based on whether they prioritise ultra-liquidity or targeted growth exposure.

Can I invest in these funds as a beginner?

Yes, these funds are accessible to beginners as standard ETFs traded on major exchanges. To invest, you typically need a brokerage account. You can purchase shares just like any stock, with IWM and IWO offering exposure to the US small-cap market. The low minimum investment and transparent pricing make them convenient starting points. However, remember these are equity funds, so values fluctuate. For income, IWM's 0.96% yield is higher than IWO's 0.46%. Beginners should consider diversification and time horizon, possibly starting with fractional shares or dollar-cost averaging to manage volatility and reduce the impact of market timing.

What risks are associated with these ETFs?

Both ETFs carry market risks inherent to small-cap stocks. IWM, with its small blend strategy, offers broad exposure but may lag in downturns. IWO, focusing on small-cap growth, is potentially more volatile but may outperform during economic expansions. Key risks include sector concentration, as IWO has no sector weight data available, and interest rate sensitivity. Liquidity varies; IWM's $77.2 billion net assets ensure deep liquidity, while IWO's $14.2 billion supports adequate trading. Always conduct thorough research and consult a financial adviser before investing.

IWM vs IWO

Two funds, one decision: we compare cost, performance and what each ETF actually holds in September 2026.

Compare iShares Russell 2000 ETF (IWM) and iShares Russell 2000 Growth ETF (IWO). This page reviews fees, holdings, dividends and how each fund tracks its market segment, highlighting the 0.19% expense ratio for IWM versus 0.24% for IWO. Educational content, not financial advice.

Fund Snapshot

Key Fund Metrics

IWM

Metric

IWO

0.19%

Expense Ratio

0.24%

0.96%

Dividend Yield

0.46%

$77.19B

Net Assets

$14.20B

1,990

Holdings

1,131

May 22, 2000

Inception Date

Jul 24, 2000

–

Index Tracked

–

Small Blend

Fund Category

Small Growth

IWM costs about $5.00 less per year for every $10,000 invested.

Shared Top Holdings

Holding	IWM	IWO
TWSTTwist Bioscience Corporation	0.36%	0.72%
MOG.AMoog Inc.	0.34%	0.68%
FROGJFrog Ltd.	0.33%	0.66%
BTSGBrightSpring Health Services, Inc.	0.31%	0.62%
GKOSGlaukos Corporation	0.31%	0.62%

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IWM vs VTWO

Compare IWM vs VTWO. VTWO has a lower expense ratio of 0.06% vs 0.19%. Check yields (1.13% vs 0.96%), net assets and shared top-10 holdings between funds.

IWM vs SCHA

Compare IWM and SCHA ETFs on expense ratios, dividend yields, top holdings and small-cap tracking methods to assess factual differences and suitability.

Investment Analysis

IWM

Pros

Low expense ratio of 0.19% and massive $77.2 billion asset base ensure deep liquidity.
Inception in May 2000 provides a long track record of broad small-cap exposure.
Dividend yield of 0.96% is relatively high for a growth-oriented small-cap blend.

Considerations

Sector weight data is not available, limiting transparency on specific industry exposures.
Top holdings have very low weights, meaning no single company drives performance significantly.
Broad small-cap exposure may underperform in markets favouring large-cap stability.

IWO

Pros

Focus on small-cap growth stocks offers potential capital appreciation during economic expansions.
Inception in July 2000 demonstrates longevity and consistency within the growth style.
Significant $14.2 billion net assets support adequate trading liquidity for most investors.

Considerations

Expense ratio of 0.24% is higher than its blend counterpart, increasing annual costs.
Low dividend yield of 0.46% makes it unsuitable for income-focused investors.
Sector weights are not available, preventing clear assessment of concentration risks within growth stocks.

About IWM and IWO

IWM (IWM)

The iShares Russell 2000 ETF (IWM) is a well-established exchange-traded fund designed to track the performance of small-cap stocks in the United States. Launched in May 2000, it offers investors broad exposure to a diverse range of smaller companies, often characterised by higher growth potential compared to large-cap giants. With net assets exceeding USD 77 billion and nearly 2,000 holdings, it provides significant diversification within the small-cap sector. The fund operates with an expense ratio of 0.19% and currently reports a dividend yield of 0.96%. While small-cap stocks can offer attractive opportunities during economic expansions, they may also experience greater volatility and sensitivity to interest rate changes than larger, more established firms. This ETF is generally considered suitable for investors seeking exposure to the US small-cap market as part of a diversified portfolio, bearing in mind that the value of investments can fall as well as rise and past performance is not a reliable indicator of future results.

IWO (IWO)

The iShares Russell 2000 Growth ETF (IWO) provides broad exposure to small-cap US companies with growth characteristics. As part of the Small Growth category, it aims to track a basket of 1,131 holdings, focusing on firms expected to increase revenue and earnings at rates above the broader market. With net assets of USD 14.20 billion and an expense ratio of 0.24%, it offers a relatively liquid vehicle for accessing this sector. Investors should note that while the dividend yield is modest at 0.46%, the fund's value relies heavily on the performance of small-cap equities. Historically, small-cap growth stocks can offer higher potential returns but also come with increased volatility compared to large-cap value counterparts. This ETF does not name a specific index it tracks unless certain, and it is designed for those seeking diversified exposure to US growth-oriented small businesses. Remember, values can rise and fall, and past performance is not a reliable indicator of future results.

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IWM vs IWO

Fund Snapshot

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Investment Analysis

IWM

Pros

Considerations

IWO

Pros

Considerations

About IWM and IWO

Buy IWM or IWO in Nemo

Zero Commission

Trusted & Regulated

6% Interest on Cash

Frequently asked questions

What are exchange-traded funds (ETFs) and how do they operate?

What does it mean when an ETF tracks an index?

What is a dividend yield and why does it vary between funds?

How do the expenses of IWM and IWO compare?

What are the key holdings of these two ETFs?

How do the dividend yields of IWM and IWO compare?

How do the fund sizes of IWM and IWO affect liquidity?

What market segment does IWM cover?

What is the market focus of IWO?

What is the trading liquidity of IWM and IWO?

Can I invest in these funds as a beginner?

What risks are associated with these ETFs?

Fund Snapshot

About IWM and IWO

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IWM vs VTWO

IWM vs SCHA