ProShares UltraShort Basic Materials (SMN) is an exchange-traded fund that seeks daily investment results corresponding to two times the inverse (-2x) of the daily performance of the Dow Jones U.S. Basic Materials Index or S&P Materials Select Sector Index, providing leveraged short exposure to the basic materials sector of the U.S. equity market; the fund employs derivatives including swaps with counterparties such as UBS AG, BNP Paribas, and Goldman Sachs International to achieve its objectives; options trading is available on the fund. SMN, part of ProShares Trust and managed by ProShare Advisors LLC, targets investors seeking tactical short-term bearish positions on materials companies involved in the production of aluminum, steel, non-ferrous metals, commodity and specialty chemicals, forest products, paper products, precious metals mining, and coal; the fund holds a concentrated portfolio typically consisting of a small number of swap contracts and net other assets, with a net expense ratio of 0.95% and quarterly distributions. Launched on January 30, 2007 and domiciled in the United States, the fund trades on NYSE Arca under ticker SMN with CUSIP 74347G226. ProShare Advisors LLC, the investment adviser, is headquartered in Bethesda, Maryland, at 7501 Wisconsin Avenue, Suite 1000E. In recent developments, ProShares implemented a 1-for-2 reverse stock split effective November 7, 2024, to maintain share price compliance, followed by additional ETF share splits announced in November 2025 including forward and reverse adjustments across its lineup; the firm surpassed $100 billion in assets under management in October 2025, reflecting expansion with new product launches such as ETFs targeting leveraged returns on individual stocks like Coinbase, Nvidia, Palantir, and Tesla; ProShares also opened a New York office in Hudson Yards and expanded its senior leadership team amid ongoing portfolio reviews that included ETF liquidations in prior years.