Fidelity Select Materials Portfolio (FSDPX) is an open-end mutual fund that seeks capital appreciation by investing primarily in common stocks of companies principally engaged in the manufacture, mining, processing, or distribution of raw materials and intermediate goods; it normally invests at least 80% of assets in securities of such companies, including those in basic materials, chemicals, metals and mining, construction materials, and related sub-industries; the fund employs fundamental analysis of issuers' financial condition, industry position, market conditions, and economic factors to select domestic and foreign investments across mid-cap blend styles. The portfolio maintains significant exposure to the basic materials sector (approximately 91%), with top holdings typically including Linde PLC, Ecolab Inc., Mosaic Co., CRH PLC, and Newmont Corporation; it diversifies across U.S. stocks (around 88%), non-U.S. stocks (around 12%, primarily Canada and Eurozone), and minimal cash, targeting institutional and retail investors seeking natural resources sector exposure. Fidelity Select Materials Portfolio, managed by Fidelity Investments, was launched on September 29, 1986, and is domiciled in the United States with headquarters in Boston, Massachusetts; the fund operates globally through its equity investments without dedicated subsidiaries. Recent management changes include Ashley Fernandes assuming lead portfolio manager responsibilities on April 1, 2022, and Boris Shepov joining as co-manager on December 10, 2024; the fund has maintained its core strategy amid sector volatility, with no reported acquisitions, mergers, or major strategic shifts in the last two years, though portfolio turnover stands at approximately 51% and net assets hover around $680-860 million USD as of late 2025.