Prospectus by Investment Company (Form 497)

EATON VANCE WORLDWIDE HEALTH SCIENCES FUND

Supplement to Prospectus dated January 1, 2025
as may be supplemented and/or revised from time to time

The following changes are effective immediately:

1.The following replaces the first paragraph in "Principal Investment Strategies" under "Fund Summary":

The Fund normally invests at least 80% of its net assets (plus any borrowings for investment purposes) in securities (primarily common stocks) of companies principally engaged in the discovery, development, production or distribution of products (or services) related to scientific advances in health care, including biotechnology, pharmaceuticals, diagnostics, managed health care and medical equipment and supplies ("health sciences companies") (the "80% Policy"). A company will be considered to be a health sciences company if, at the time of investment: (i) the company is classified as a member of the Global Industry Classification Standard ("GICS") health care sector; (ii) the company is a component of the S&P 500 Health Care Index or the MSCI World Health Care Index; or (iii) 50% or more of the company's sales, earnings or assets will arise from or will be dedicated to the application of scientific advances related to health care. The Fund invests in U.S. and foreign securities and will normally be invested in issuers located in and tied economically to at least three different countries. The Fund may invest in securities of both larger established and smaller emerging companies domiciled in developed or emerging markets, some of which may be denominated in foreign currencies or trade in the form of depositary receipts, such as American Depositary Receipts, which are either sponsored or unsponsored, and Global Depositary Receipts. The Fund has a policy of investing at least 25% of its assets in investments in the medical research and health care industry. Companies in the medical research and health care industry are categorized by GICS as pharmaceuticals, biotechnology, life sciences and health care equipment and services companies. The Fund may invest up to 5% of its total assets in royalty bonds, which are debt securities that are collateralized by royalties from pharmaceutical patents. The Fund may also invest in exchange-traded funds ("ETFs"), a type of pooled investment vehicle, in order to manage cash positions or seek exposure to certain markets or market sectors and may lend its securities.