Nicolet Bankshares, Inc. is a U.S. regional bank holding company based in Green Bay, Wisconsin.

In February 2020, Nicolet Bankshares announced plans to acquire West Bend, Wisconsin-based Commerce State Bank and its four branches in a deal valued at $129.6 million.

[11] On April 26, 2021 Robert B. Atwell left as chief executive officer at Nicolet Bank after 19 years.

[12] On September 3, 2021, Nicolet completed a merger with Mackinac Financial Corporation, headquartered in Manistique, Michigan, and operating as mBank with branches in Michigan's Upper Peninsula and northern Lower Peninsula.

It also sold the Birmingham branch and lending office in Metro Detroit to the Bank of Ann Arbor.