Alison O'Neill

Overview

Alison O'Neill is an executive vice president and chief investment officer at MFS Investment Management® (MFS®). As CIO, she oversees the firm's global investment platform, which comprises more than 300 investment professionals across investment research, portfolio management, trading and investment risk. Alison was named CIO in 2025. She joined MFS in 2005 as an equity research analyst after completing the firm's MBA summer internship program in 2004. She was named director of research for North America in 2016, assumed her portfolio manager role in 2018 and was named co-CIO of Equity in 2020. She has worked in the industry since 2000. Alison earned a Bachelor of Arts degree cum laude from Harvard University and a Master of Business Administration degree from the Massachusetts Institute of Technology.