Strategy. Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in U.S. securities. The Fund will invest primarily in equity securities and other financial instruments that have similar economic characteristics to such securities. Equity securities include, but are not limited to, common stock, preferred stock, convertible securities and depositary receipts. The Fund may invest in issuers of any market capitalization, including small- to mid-capitalization companies. BlackRock will seek to invest in portfolio securities that BlackRock believes (i) can bring additional and measurable impact based on the Impact Themes (as defined below) and (ii) also have the potential to produce attractive long-term returns across economic sectors. As part … Show more… Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in U.S. securities. The Fund will invest primarily in equity securities and other financial instruments that have similar economic characteristics to such securities. Equity securities include, but are not limited to, common stock, preferred stock, convertible securities and depositary receipts. The Fund may invest in issuers of any market capitalization, including small- to mid-capitalization companies. BlackRock will seek to invest in portfolio securities that BlackRock believes (i) can bring additional and measurable impact based on the Impact Themes (as defined below) and (ii) also have the potential to produce attractive long-term returns across economic sectors. As part of its methodology, BlackRock identifies Impact Themes (including, but not limited to, affordable housing, education and skilling, financial and digital inclusion, public health, safety and security, efficiency, electrification and digitalization, green energy, pollution remediation and prevention, sustainable food, water and waste) that seek to encapsulate companies which are helping to address the United Nations Sustainable Development Goals (SDGs) through their products and services. The SDGs are a series of goals published by the United Nations that recognize that ending poverty and other deprivations must go hand-in-hand with improvements in health, education, and economic growth, and reduction in inequalities, while tackling climate change and working to preserve the planets oceans and forests. BlackRock maps its Impact Themes to the SDGs and considers whether a portfolio companys core business areas align to the Impact Themes. BlackRock considers three main criteria when selecting portfolio constituents for the investment universe: materiality (that a majority of revenues or business activity advances one or more of the SDGs); additionality (that a companys products and/or services address a specific need that is unlikely to be met by other institutions); and measurability (that the impact a company is achieving over time can be quantified). The Fund is classified as non-diversified under the Investment Company Act of 1940, as amended. Show less