Tekla Healthcare Investors Declares Distribution, Payable on December 31, 2021

abrdn Healthcare Investors (the Fund), formerly Tekla Healthcare Investors, is a non-diversified closed-end healthcare fund. The Fund's investment objective is to seek long-term capital appreciation by investing primarily in securities of healthcare companies. In addition, it seeks to provide regular distribution of realized capital gains. It may invest up to 20% of its net assets in securities of foreign issuers, located primarily in Western Europe, Canada and Japan, and securities of United States issuers that are traded in foreign markets. It invests in healthcare industries and is focused on the smaller, emerging companies, investing a maximum of 40% of the Fund's assets in restricted securities of both public and private companies. It invests in subsectors, such as biotechnology, pharmaceuticals, healthcare equipment, healthcare supplies, life science tools and services, healthcare distributors, managed healthcare and others. abrdn Inc. is the investment adviser of the Fund.