You are given a text that consists of multiple sentences. Your task is to perform abstractive summarization on this text. Use your understanding of the content to express the main ideas and crucial details in a shorter, coherent, and natural sounding text.

MILWAUKEE--(BUSINESS WIRE)--The Board of Directors of Eagle Capital Growth Fund, Inc. (Fund) (NYSE American: GRF) unanimously agreed to opt in to the Maryland Control Share Acquisition Act effective immediately. The Fund is a closed-end investment company that invests primarily in high quality growth companies. To learn more about the Fund, please go the Funds website: www.eaglecapitalgrowthfund.com If you have a question about the Fund, please contact David C. Sims, the Funds Chief Financial Officer and Chief Compliance Officer, at (414) 765-1107, or by e-mail to: dave@simscapital.com

Answer: Eagle Capital Growth Fund Opts Into Maryland Control Share Acquisition Act