DFA Emerging Markets Sustainability Core 1 Institutional (DESIX) is a mutual fund offered by Dimensional Fund Advisors LP (DFA) that seeks to achieve long-term capital appreciation by investing primarily in equity securities of companies in emerging markets with favorable characteristics related to sustainability. The fund's portfolio emphasizes stocks of companies whose primary business activities contribute positively to sustainable outcomes, including environmental, social, and governance (ESG) factors; it employs a systematic, multi-factor investment approach that integrates profitability, valuation, and sustainability screens to select securities from emerging market countries such as China, India, Taiwan, Brazil, and South Africa. Core holdings span sectors like financials, technology, consumer discretionary, and materials, with specific focus on firms demonstrating strong profitability metrics, low valuations relative to fundamentals, and alignment with sustainability themes such as resource efficiency and social impact; the fund offers daily liquidity, institutional share class pricing with low expense ratios, and is available to qualified institutional investors through financial intermediaries. Headquartered in Austin, Texas, DFA established the fund in 2021 as part of its expanding lineup of sustainability-oriented strategies managed under the broader Dimensional suite of actively managed index-like funds. Recent developments include enhancements to DFA's sustainability framework in 2024, incorporating updated proprietary sustainability scores derived from advanced data analytics on corporate impacts; the firm also announced a strategic alliance with leading ESG data providers in late 2024 to refine screening methodologies, alongside portfolio expansions into additional emerging market segments amid growing demand for responsible investing products.