Strategy. The Fund normally invests at least 80% of its net assets, (plus any borrowings for investment purposes) in the common stocks of mid-cap companies. The Fund defines mid-cap companies as those whose market capitalization falls within the range of the Russell Midcap Index at the time of investment. As of December 31, 2024, the market capitalization of the Russell Midcap Index companies ranged from $159.4 million to $171.7 billion with a weighted average market capitalization of $28.6 billion. Market capitalizations of companies within the Russell Midcap Index are subject to change. Although primarily investing in mid-cap U.S. companies, the Fund may also invest in small-cap companies. The Fund may invest up to 25% of its net assets in publicly-traded real … Show more… The Fund normally invests at least 80% of its net assets, (plus any borrowings for investment purposes) in the common stocks of mid-cap companies. The Fund defines mid-cap companies as those whose market capitalization falls within the range of the Russell Midcap Index at the time of investment. As of December 31, 2024, the market capitalization of the Russell Midcap Index companies ranged from $159.4 million to $171.7 billion with a weighted average market capitalization of $28.6 billion. Market capitalizations of companies within the Russell Midcap Index are subject to change. Although primarily investing in mid-cap U.S. companies, the Fund may also invest in small-cap companies. The Fund may invest up to 25% of its net assets in publicly-traded real estate investment trusts (REITs). The Fund normally will invest at least 80% of its net assets (plus any borrowings for investment purposes) in companies and other issuers that the investment adviser determines operate in a manner consistent with or promote The Calvert Principles for Responsible Investment (the Principles). The Principles provide a framework for the investment advisers evaluation of investments considering environmental, social and governance (ESG) factors. Each company is evaluated relative to an appropriate peer group based on material ESG factors as determined by the investment adviser. Pursuant to the Principles, the investment adviser seeks to identify companies and other issuers that operate in a manner that is consistent with or promotes environmental sustainability and resource efficiency, equitable societies and respect for human rights, and accountable governance and transparency. The Fund generally invests in issuers that are believed by the investment adviser to operate in accordance with the Principles and may also invest in issuers that the investment adviser believes are likely to operate in accordance with the Principles pending the investment advisers engagement activity with such issuer. For additional information, please refer to Appendix A: The Calvert Principles for Responsible Investment in this prospectus. The Fund may invest up to 25% of its net assets in foreign securities. As an alternative to holding foreign stocks directly, the Fund may invest in U.S. dollar-denominated securities of foreign companies that trade on U.S. exchanges or in the over-the-counter market (including American Depositary Receipts (ADRs), which are either sponsored or unsponsored, and Global Depositary Receipts (GDRs)). The Fund may also lend its securities. The investment adviser selects securities primarily on the basis of fundamental research, and consideration of the responsible investing criteria described above. The portfolio managers utilize the information provided by, and the expertise of, the investment advisers research staff in making investment decisions. In selecting securities, the portfolio managers seek companies that have sustainable earnings and cash flow, a strong and durable financial profile, secular and cyclical growth prospects, and the ability to maintain a competitive position within its industry. The portfolio managers also employ a disciplined valuation framework in pursuit of attractive risk adjusted returns. The portfolio managers seek to manage investment risk by maintaining broad issuer and industry diversification among the Funds holdings, and by utilizing fundamental analysis of risk/return characteristics in securities selection. The portfolio managers may sell a security when they believe it is fully valued, the fundamentals of a company deteriorate, or to pursue alternative investment options. A security will also be sold (in accordance with the investment advisers guidelines and at a time and in a manner that is determined to be in the best interests of shareholders) if the investment adviser determines that the issuer does not operate in a manner consistent with the Funds responsible investment criteria. Show less