Fidelity Mega Cap Stock Fund (FGRTX) is an open-end mutual fund that seeks high total return through a combination of current income and capital appreciation by normally investing at least 80% of its assets in common stocks of companies with mega market capitalizations, generally those similar to companies in the Russell Top 200 Index; it employs a blend investment style focusing on large-cap equities across sectors such as technology, financials, healthcare, and consumer discretionary, with top holdings typically including leading U.S. firms like Microsoft, NVIDIA, and others. The fund offers daily liquidity, quarterly dividend distributions if any, and semiannual capital gains distributions, targeting retail and institutional investors seeking exposure to stable, high-capitalization U.S. stocks with dividend potential and growth prospects; it maintains a net expense ratio of approximately 0.58%, no front-end or deferred loads, and a portfolio turnover reflecting active management. Part of Fidelity Hastings Street Trust, the fund is domiciled in the United States, headquartered at 245 Summer Street in Boston, Massachusetts, and was launched on December 28, 1998. Geographically, it primarily operates in U.S. equity markets, serving investors worldwide through Fidelity's distribution network. Managed by Fidelity Management & Research Company LLC (FMR), with portfolio manager Matthew Fruhan since April 2009, the fund reported total net assets of approximately $5.27 billion as of recent data. In recent years, the fund has maintained its core strategy amid market volatility, delivering strong performance such as a year-to-date return of 25.12% through December 2025 and fiscal year gains of 20.02% ending June 30, 2025, outperforming the Russell Top 200 Index; no major mergers, acquisitions, partnerships, or structural changes specific to FGRTX were announced in 2024 or 2025, reflecting continuity under Fidelity Investments' ongoing emphasis on large-cap active strategies.