Form 4 Filing for Bank First Corp

This Form 4 filing details a transaction by Kevin M. LeMahieu, Chief Financial Officer of Bank First Corp. On April 9, 2026, LeMahieu disposed of 1,785 shares of Common Stock at a price of $142.61 per share. Following this transaction, LeMahieu directly owns 22,021 shares. The filing code indicates this was a disposition of stock. The shares held include those in the Bank First Retirement Plan, as noted in footnote F1.