DFA Investment Grade I (DFAPX) is a mutual fund offered by Dimensional Fund Advisors LP (DFA), which provides passively managed investment products focused on factor-based strategies emphasizing size, value, and profitability premiums in equity and fixed income markets. The fund invests primarily in investment-grade bonds, including U.S. Treasuries, government agency securities, corporate bonds, mortgage-backed securities, and asset-backed securities; it employs a systematic approach to tilt toward shorter-duration, higher-yield segments within the broad investment-grade universe while maintaining low turnover and tax efficiency. DFA operates globally, serving institutional investors, financial advisors, and high-net-worth individuals through a network of registered investment advisors, with principal operations in the United States, Europe, Asia-Pacific, and Australia. Founded in 1981 and headquartered in Austin, Texas, DFA manages over $700 billion in assets as of late 2025, with no major subsidiaries but strategic alliances including long-term partnerships with academic institutions like the University of Chicago for research-driven indexing. In recent developments, DFA announced a headquarters relocation from Santa Monica, California, to Austin, Texas, in 2024 to consolidate operations and foster growth; the firm also expanded its fixed income offerings in 2025 with enhanced short-duration strategies amid rising interest rates, and participated in a significant funding round for its international arm to bolster European distribution channels.