What defines a sector ETF, and how do IYM and XLB differ fundamentally?

A sector ETF invests in companies within a specific industry group. IYM, the iShares U.S. Basic Materials ETF, tracks the S&P 500 Capped Basic Materials Index, providing pure basic materials exposure. In contrast, XLB, the Materials Select Sector SPDR Fund, tracks a broader sub-index that includes construction materials stocks excluded by IYM. This fundamental difference in index methodology leads to distinct portfolio compositions and risk profiles for each fund, despite both operating in the materials sector.

What is an expense ratio, and how does it affect these materials funds?

The expense ratio is the annual fee expressed as a percentage of assets. IYM has an expense ratio of 0.37%, while XLB's is significantly lower at 0.08%. This means XLB costs 0.29 percentage points less annually. Over time, lower fees can enhance net returns for investors, as more of the fund's gross performance is retained. Understanding this cost differential is crucial when comparing long-term investment value between the two ETFs.

How do tracking indexes influence the holdings of IYM and XLB?

Each ETF replicates a specific index. IYM tracks the S&P 500 Capped Basic Materials Index, resulting in exposure solely to basic materials companies. XLB tracks the Materials Select Sector Index, which includes both basic and construction materials. This causes differences in top holdings; for instance, XLB includes construction-focused names not found in IYM's top ten. Investors should note that these index methodologies dictate the underlying asset composition and sector breadth of each fund.

Why is liquidity important, and how do IYM and XLB compare?

Liquidity refers to how easily an asset can be bought or sold without impacting its price. XLB has net assets of $8.1 billion, supporting high liquidity and tighter trading spreads. IYM has net assets of $1.1 billion, which is lower but still substantial. Higher liquidity, as seen in XLB, generally benefits active traders by reducing transaction costs. However, both funds are established ETFs, and their size differences reflect varying levels of investor adoption and trading volume in the market.

How do the dividend yields of IYM and XLB differ?

Dividend yield indicates the annual payout relative to the fund's price. XLB offers a dividend yield of 1.72%, while IYM provides 1.27%. This difference may reflect variations in the underlying companies' payout policies or sector composition. XLB's inclusion of construction materials firms might contribute to its higher yield. Investors should view yields as part of total return, noting that distributions can vary over time based on the holdings' performance and dividend policies within the respective indices tracked by each fund.

What are the key similarities and differences in their top holdings?

Both IYM and XLB share six top-ten holdings: LIN, NEM, FCX, ECL, NUE, and STLD. However, the weighting differs; for example, LIN comprises 18.69% of IYM but only 11.57% of XLB. IYM's top holdings include more basic materials giants, while XLB includes construction-focused names like SHW, MLM, CRH, and VMC in its top ten. This overlap confirms their sector correlation, but the differing concentrations highlight distinct risk exposures and strategic focuses in portfolio construction.

How do historical track records compare between IYM and XLB?

Inception dates provide context for long-term evaluation. IYM was launched on June 12, 2000, while XLB started earlier on December 16, 1998. XLB therefore has a longer performance history, offering slightly more data for historical analysis. Both funds have been active through multiple market cycles. While past performance does not guarantee future results, a longer track record can sometimes aid in assessing volatility and consistency during diverse economic conditions, allowing for more robust comparative analysis over time.

What risks arise from concentration in top holdings for these funds?

Concentration risk occurs when a significant portion of a fund's assets is invested in few holdings. IYM has notable concentration in Linde (LIN) at 18.69%, which is higher than XLB's 11.57% weighting in the same stock. This means IYM is more sensitive to Linde's performance. While XLB also has concentrated top holdings, its broader inclusion of construction materials and slightly lower single-stock weight in LIN mitigates specific idiosyncratic risk compared to IYM, affecting overall portfolio volatility differently.

How does sector methodology impact exposure to construction materials?

IYM strictly tracks basic materials, excluding construction materials stocks. XLB, tracking the Materials Select Sector, includes companies like CRH and VMC, which are involved in building materials and construction. This means XLB provides broader materials sector exposure, including cyclically sensitive construction firms. Investors seeking pure-play basic materials might prefer IYM's methodology, whereas those wanting a more comprehensive materials sector view might lean towards XLB, depending on their perspective on construction market trends and diversification needs.

Which fund might align better with low-cost investing goals?

For investors prioritising lower ongoing costs, XLB is advantageous with an expense ratio of 0.08% compared to IYM's 0.37%. This 0.29 percentage point difference accumulates over time, potentially resulting in higher net returns for XLB, assuming all other factors like performance are equal. While IYM offers specific basic materials exposure, the cost efficiency and larger asset base of XLB make it a practical choice for those focused on minimising fees while accessing the broader materials sector through a highly liquid vehicle.

What educational disclaimer applies to this ETF comparison?

This content is provided for educational purposes only and does not constitute financial advice. Comparisons of expense ratios, holdings, and yields are based on data from Yahoo Finance as of September 22, 2026. Figures such as net assets and dividend yields fluctuate. Investors should conduct their own due diligence, consider their individual financial situations, and consult qualified professionals before making investment decisions. Past performance of IYM or XLB is not indicative of future results, and market conditions may change significantly over time.

IYM vs XLB

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

Compare iShares U.S. Basic Materials ETF and Materials Select Sector SPDR Fund by examining expense ratios, top holdings, dividend yields, and how each tracks its index. This page provides neutral, factual insights to help you understand the key differences between these two materials sector funds. Educational content, not financial advice.

Fund Snapshot

Key Fund Metrics

IYM

Metric

XLB

0.37%

Expense Ratio

0.08%

1.27%

Dividend Yield

1.72%

$1.09B

Net Assets

$8.10B

Holdings

Jun 12, 2000

Inception Date

Dec 16, 1998

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Index Tracked

–

Natural Resources

Fund Category

Natural Resources

XLB costs about $29.00 less per year for every $10,000 invested.

Shared Top Holdings

Holding	IYM	XLB
LINLinde plc	18.69%	11.57%
NEMNewmont Corporation	11.50%	7.09%
FCXFreeport-McMoRan Inc.	9.09%	5.60%
ECLEcolab Inc.	5.99%	4.54%
NUENucor Corporation	4.12%	4.42%
STLDSteel Dynamics, Inc.	2.98%	4.49%

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IYM vs VAW

Compare IYM and VAW, examining expense ratios, net assets, dividend yields, and top holdings like LIN and FCX. Review tracking and operational history for U.S.

VAW vs XLB

Compare VAW and XLB expense ratios, dividends, and holdings. Analyse Vanguard and SPDR materials sector performance to understand fund differences.

Investment Analysis

IYM

Pros

Tracks the S&P 500 Capped Basic Materials Index, ensuring pure basic materials exposure.
Lower expense ratio than many active alternatives, though above XLB's cost.
Long history since 2000 inception provides meaningful performance track record for evaluation.

Considerations

Expense ratio of 0.37% is notably higher than the low-cost XLB fund.
Concentration in top holdings like Linde at 18.69% increases single-stock idiosyncratic risk.
Sector methodology differs from XLB, excluding construction materials stocks held by XLB.

XLB

Pros

Expense ratio of 0.08% offers very low-cost access to the materials sector.
Large net assets of $8.1 billion support high liquidity and tight trading spreads.
Inception in 1998 gives it an older track record than IYM for long-term comparison.

Considerations

Excludes basic materials names in IYM, focusing only on the Select Sector sub-index.
Higher dividend yield of 1.72% may reflect sector composition differences from IYM.
Sector weight concentration in top materials and construction holdings remains significant.

About IYM and XLB

IYM (IYM)

The iShares U.S. Basic Materials ETF (IYM) offers investors exposure to the fundamental building blocks of the modern economy. As a sector-specific fund, it tracks a basket of companies involved in the exploration, mining, processing, and sale of raw materials, including chemicals, metals, and mining operations. With 43 holdings, this ETF provides a focused view of the U.S. materials industry, which often plays a crucial role in global supply chains and infrastructure development. The fund has a dividend yield of 1.27% and an expense ratio of 0.37%. While basic materials can be sensitive to economic cycles and commodity prices, they are essential for manufacturing, construction, and technology. Investors should note that sector performance can fluctuate based on global demand, regulatory changes, and operational costs, meaning values can rise and fall. This fund is suitable for those seeking targeted industry exposure within a broader diversified portfolio.

XLB (XLB)

The Materials Select Sector SPDR Fund (XLB) offers investors exposure to the materials sector, encompassing companies involved in the production and processing of chemicals, construction materials, and packaging. As an ETF, it tracks a benchmark index covering this specific industry segment, providing a convenient way to gain diversified access to 28 key holdings without picking individual stocks. Launched in 1998, the fund has grown to manage approximately USD 8.10 billion in net assets. It features a competitive expense ratio of 0.08% and currently provides a dividend yield of 1.72%. While the materials sector can be influenced by global economic cycles and commodity prices, XLB allows investors to potentially benefit from industrial growth trends. However, as with any investment, values can fluctuate, and returns are not guaranteed. This fund is suitable for those seeking sector-specific exposure within a broader portfolio strategy.

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IYM vs XLB

Fund Snapshot

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IYM

Pros

Considerations

XLB

Pros

Considerations

About IYM and XLB

Buy IYM or XLB in Nemo

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Trusted & Regulated

6% Interest on Cash

Frequently asked questions

What defines a sector ETF, and how do IYM and XLB differ fundamentally?

What is an expense ratio, and how does it affect these materials funds?

How do tracking indexes influence the holdings of IYM and XLB?

Why is liquidity important, and how do IYM and XLB compare?

How do the dividend yields of IYM and XLB differ?

What are the key similarities and differences in their top holdings?

How do historical track records compare between IYM and XLB?

What risks arise from concentration in top holdings for these funds?

How does sector methodology impact exposure to construction materials?

Which fund might align better with low-cost investing goals?

What educational disclaimer applies to this ETF comparison?

Fund Snapshot

About IYM and XLB

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