Marshall & Ilsley Corporation is a diversified financial services corporation with $56.6 billion in assets. Founded in 1847 and headquartered in Milwaukee, Wisconsin, M&I is the largest Wisconsin-based bank. M&I also has locations in Arizona, Florida, Indiana, Minnesota, Missouri, St. Louis, and Nevada. M&I offers trust and investment management, equipment leasing, mortgage banking, asset-based lending, financial planning, investments, and insurance services throughout the country and on the Internet. M&I's customer-based approach, internal growth, and strategic acquisitions have made M&I a nationally recognized leader in the financial services industry. .

At M&I, the Golden Rule is the foundation of everything we do. We believe in treating our customers, employees, shareholders, and members of our communities as we would like to be treated ourselves. As part of that commitment, we are dedicated to offering an environment in which our employees can excel and grow. Onsite employee development opportunities at M&I University in Brookfield bring together employees from around the country to share knowledge, learn new skills, and establish networks. In addition, workplace flexibility opportunities; comprehensive health and wellness benefits (such as personal health assessments); and a variety of employee and family events help employees achieve a positive balance between their work and personal lives.
Despite its size (9,473 employees) and geographic diversity, M&I employees describe M&I as a "family" and appreciate the value M&I’s culture places on working together to accomplish mutual goals. Turnover is low, and as a result, M&I has many long-tenured and loyal employees, many of whom have referred their friends and family to work at M&I as well. In fact, more than 40 percent of all new hires at M&I are through referrals from current employees – a testament to the pride our employees have in working for a Top 100 workplace.