X0508 4 2025-08-27 0001174850 NICOLET BANKSHARES INC NIC 0001667436 Witczak Eric James C/O NICOLET NATIONAL BANK 111 NORTH WASHINGTON STREET GREEN BAY WI 54301 1 EVP & Secretary 0 Common Stock 2025-08-27 4 M 0 5000 70.50 A 33901 D Common Stock 2025-08-27 4 F 0 3412 139.655 D 30489 D Common Stock 2025-08-27 4 S 0 1588 139.42 D 28901 D Common Stock 6783 I By 401(k) Plan Stock Option (Right to Buy) 70.50 2025-08-27 4 M 0 5000 0 D 2029-11-18 Common Stock 5000 10000 D The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $139.30 to $139.64, inclusive. The reporting person undertakes to provide to Nicolet Bankshares, Inc., any security holder of Nicolet Bankshares, Inc., or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (1) to this Form 4. Includes shares acquired under the Employee Stock Purchase Plan. Mr. Witczak has not acquired additional shares under the Employee Stock Purchase Plan since his last Form 4 filing on August 27, 2025. Mr. Witczak owns a total of 1,042 shares in the Employee Stock Purchase Plan as of the date of this report. The nonqualified stock option fully vested as of November 18, 2024, and is currently exercisable as to all remaining 10,000 shares. /s/ H. Phillip Moore, Jr., as attorney-in-fact for Eric J. Witczak 2025-08-28