IYM vs XLB: Weighing Two Basic Materials ETFs

Key Takeaways

• Shared sector, different scope: Both funds target U.S. basic materials, but IYM casts a wider net (~40 holdings) while XLB tracks a narrower S&P 500 subset (~28 holdings).
• Cost gap: XLB's expense ratio of 0.08% is roughly a fifth of IYM's 0.38%, a meaningful structural advantage over long holding periods.
• Concentration profile: IYM leans more heavily on its top name, with Linde (LIN) approaching 20% of assets, whereas XLB spreads weight more evenly across chemicals, metals, and construction materials.
• Liquidity and scale: XLB holds roughly eight times more assets under management (AUM) than IYM and trades with substantially higher daily volume.
• Risk profile: Both are passively managed, non-diversified funds, but XLB offers lower single-stock concentration risk at the top of the portfolio.
• Tickeron AI Verdict: XLB is the preferred choice, driven by superior cost efficiency, deeper liquidity, and more balanced sector diversification.

Introduction

Investors looking for exposure to the U.S. basic materials sector—covering chemicals, metals, mining, and construction inputs—often find themselves comparing the iShares U.S. Basic Materials ETF (IYM) and the Materials Select Sector SPDR Fund (XLB). While both ETFs aim at the same broad objective, they follow different indexes, carry distinct cost structures, and deliver varying levels of diversification. These differences can influence concentration risk, ongoing expenses, and how each fund responds to shifts in sector leadership, which is why a closer examination of their construction and positioning remains worthwhile.

IYM Overview

IYM tracks the Russell 1000 Basic Materials RIC 22.5/45 Capped Index through a passive approach that uses optimized sampling rather than holding every component. The fund typically holds 40 to 43 securities and falls into the non-diversified category. Its portfolio shows notable concentration at the top: Linde (LIN) represents around 20% of assets, Newmont (NEM) sits near 10–11%, and Freeport-McMoRan (FCX) accounts for roughly 7–8%. Additional holdings include Ecolab (ECL), Air Products & Chemicals (APD), Fastenal (FAST), Nucor (NUE), AngloGold Ashanti (AU), and Steel Dynamics (STLD). The expense ratio stands at 0.38%, with total AUM near $1.3 billion. I also checked this using Tickeron’s AI Screener to see how the holdings align with broader industry trends.

XLB Overview

XLB follows the S&P Materials Select Sector Index, which covers the materials portion of the S&P 500. It uses full replication across roughly 28 holdings and maintains a non-diversified structure. Its expense ratio is 0.08%, and assets under management exceed $8 billion, supporting strong liquidity. Top positions are more evenly weighted, with Linde (LIN) at about 13%, Newmont (NEM) near 6.5–7%, and Freeport-McMoRan (FCX) around 5.5%. The fund also includes construction and coatings exposure through names such as Vulcan Materials (VMC), Sherwin-Williams (SHW), and Martin Marietta (MLM), along with Ecolab (ECL), Nucor (NUE), and Steel Dynamics (STLD).

Sector Environment

The basic materials space currently reflects several intersecting influences. Industrial gases and specialty chemicals draw steady demand from manufacturing and energy-transition projects, while metals and mining companies like Newmont and Freeport-McMoRan respond to commodity price movements, especially in gold and copper. Construction materials, more prominent in XLB, feel the effects of infrastructure spending and interest-rate trends. Sector risks remain centered on manufacturing cycles, currency fluctuations, input-cost inflation, and regulatory shifts. From what I see, the balance between defensive chemicals and cyclical metals within each fund can affect relative stability during rotations.

Performance and Positioning

Both ETFs have tracked the materials sector closely in recent periods, yet their structural differences show up in positioning. IYM’s heavier weighting toward Linde and gold miners creates greater sensitivity to industrial gases and precious metals, which can magnify gains in commodity upswings but also heightens single-name exposure. XLB’s broader spread across chemicals, metals, construction materials, and packaging tends to deliver a steadier profile with less reliance on any individual stock. The cost advantage for XLB is clear and persistent: its 0.08% expense ratio versus IYM’s 0.38% reduces fee drag across market conditions. XLB’s greater liquidity also supports tighter spreads. In terms of volatility, XLB’s lower top-holding concentration has historically contributed to a somewhat smoother path through sector shifts.

Using Tickeron AI Tools

When comparing ETFs like these, I turn to Tickeron’s AI-powered tools to cross-check structural factors and relative positioning. The platform helps surface additional context on holdings, costs, and sector alignment that complements traditional analysis. It supports a more efficient review process without replacing individual judgment.

Tickeron AI Verdict

Based on the structural factors outlined above, Tickeron’s AI currently points toward XLB over IYM. The preference rests on XLB’s lower expense ratio, stronger liquidity, larger asset base, and more balanced exposure across the materials sector. While IYM provides slightly broader coverage and greater gold exposure, its higher fees and elevated single-stock concentration at the top add incremental risk without an offsetting advantage. In an environment where leadership can shift quickly between chemicals and metals, XLB’s combination of diversification and cost efficiency offers a more resilient base. This view reflects observable data and trend analysis rather than personalized advice.

Disclaimer

The information on this webpage is provided for general informational and educational purposes only and is not intended as investment advice, a recommendation to purchase or sell any security, or an offer or solicitation related to investments. It does not consider your personal financial situation, goals, or risk profile, and all investing carries inherent risks, including the possibility of losing your entire investment. For more details, please review our full disclaimer.

Disclaimers and Limitations

Contributor

Allana|Expert

Financial analyst and market blogger with expertise in equity research, fundamental analysis, and macroeconomic trends. I regularly publish coverage on individual stocks, ETFs, and sector developments — combining rigorous financial analysis with clear, engaging writing for a broad investment audience.

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