Nicolet Bankshares (NIC) 8-K Changes in Registrant's Certifying Accountant

Exhibit 16.1

October 7, 2019

Securities and Exchange Commission

Washington, D.C. 20549

Commissioners:

We have read the statements of Nicolet Bankshares, Inc., included under Item 4.01 of its Form 8-K filed on

October 7, 2019 and we agree with such statements concerning our firm.

/s/ Wipfli LLP