RSM celebrates 100th anniversary

RSM US, a Chicago-headquartered mid-market accounting and consulting firm, on June 1, 2026 celebrated 100 years in business.

The accountancy marked the milestone with a marketing campaign titled “RSM^100” (RSM to the Power of 100).

“RSM^100 is rooted in what we’ve learned from a century of working alongside dynamic, growing companies," said Brian Becker, managing partner of RSM US. “We have built a deep, enduring understanding of how these businesses think, operate and compete. That perspective shapes how we support our clients as they manage increasing scale, complexity and risk.”

RSM is the fifth-largest accounting and consulting firm in the United States, with revenue of $4 billion and approximately 17,000 employees.

The firm last year formed a transatlantic partnership encompassing the US, Canada, UK, and Ireland – with integrated teams in India and El Salvador.

"A hundred years is a remarkable milestone, but what it really represents is the trust middle market businesses have placed in us to help them navigate whatever comes next,” added Becker, who also leads the RSM transatlantic partnership. “Our job is to meet them there, with the talent, digital capabilities and global reach required to prepare today’s growing businesses for the challenges and opportunities of tomorrow.”

RSM recently announced a raft of senior leadership appointments.