People's United Financial, Inc., was an American bank holding company that owned People's United Bank, operating 403 branches across Connecticut, southeastern New York State, Massachusetts, Vermont, Maine, and New Hampshire. As the second-largest full-service bank in New England and one of the largest in the northeast, it was the 46th-largest bank in the United States. The firm typically engaged in post-IPO debt rounds, focusing on substantial investments in established companies.

Notable portfolio companies include Invesque, which raised $80 million, and MVC Capital, which raised $50 million. Key decision-makers included Chairman George P. Carter. People's United Financial provided significant value-add services through its extensive network and financial expertise, leveraging its position as a major regional bank to support portfolio companies. The firm merged into M&T Bank in 2022.