iShares U.S. Basic Materials ETF (IYM) is an exchange-traded fund that seeks to track the investment results of the Dow Jones U.S. Basic Materials Index, which measures the stock performance of U.S. equities in the basic materials sector, including companies involved in the production of raw materials such as metals, chemicals, and forestry products. The ETF provides investors with exposure to a diversified portfolio of large-cap U.S. basic materials companies through a market-cap-weighted approach; top holdings include Linde plc (approximately 22%), Newmont Corp., Freeport-McMoRan Inc., Ecolab Inc., and Air Products and Chemicals Inc., with a total of around 42 holdings and assets under management of approximately $565 million as of late 2025. Launched on June 12, 2000, IYM is managed by BlackRock Fund Advisors, part of BlackRock, Inc., and headquartered in San Francisco, California, with an expense ratio of 0.38% and primary operations focused on the U.S. equity markets.
IYM serves institutional and retail investors targeting the basic materials industry segment, which encompasses subsectors like chemicals, metals and mining, paper and forest products, and construction materials; it offers daily liquidity on the NYSE Arca exchange and quarterly distributions. The fund maintains a blend style with large-cap emphasis and does not pursue ESG or sustainable investment strategies. Geographically, its exposure is concentrated in U.S.-domiciled companies, though some holdings like Linde plc have global operations.
In recent developments, IYM has experienced portfolio adjustments reflecting sector dynamics, including increased weighting in mining and metals amid U.S. critical minerals designations for copper, silver, and uranium in the 2025 USGS list, alongside stable AUM growth to over $500 million; no major structural changes such as index reconstitutions, expense ratio adjustments, or product launches specific to IYM were reported in 2024-2025, though BlackRock continued expanding its broader iShares lineup with new fixed income ETFs. Holdings updates as of December 2025 highlight positions in companies like Anglogold Ashanti and Solstice Advanced Materials, underscoring ongoing adaptation to materials market trends.