BASIS OF PRESENTATION	3 Months Ended
Mar. 31, 2026
BASIS OF PRESENTATION
BASIS OF PRESENTATION	NOTE 1 – BASIS OF PRESENTATION Bank First Corporation (the “Company”) provides a variety of financial services to individual and corporate customers through its wholly-owned subsidiary, Bank First, N.A. (the “Bank”). The Bank operates as a full-service financial institution with a primary market area including, but not limited to, the counties in which the Bank’s branches are located. The Bank has thirty-eight locations located in Brown, Columbia, Dane, Door, Fond du Lac, Green, Jefferson, Manitowoc, Monroe, Outagamie, Ozaukee, Rock, Shawano, Sheboygan, Walworth, Waupaca, Waushara, and Winnebago counties in the State of Wisconsin and Winnebago county in the State of Illinois. The Company and Bank are subject to the regulations of certain federal agencies and undergo periodic examinations by those regulatory authorities. These interim unaudited consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) for interim financial information and with the instructions to Quarterly Report on Form 10-Q and Article 10 of Regulation S-X. Accordingly, certain information and footnote disclosures required by GAAP have been omitted or abbreviated. These unaudited consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and footnotes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025 (“Annual Report”). The unaudited consolidated financial statements include all adjustments, consisting of normal recurring adjustments, necessary for a fair presentation of the results for the interim periods. The results for interim periods are not necessarily indicative of results for a full year. Critical Accounting Policies and Estimates The accounting and reporting policies of the Company conform to GAAP in the United States and general practices within the financial institution industry. To prepare financial statements in conformity with GAAP, management makes estimates, assumptions and judgments based on available information. These estimates, assumptions and judgments are based on information available as of the date of the financial statements and, as this information changes, actual results could differ from the estimates, assumptions and judgments reflected in the financial statement. As disclosed in the Company’s Annual Report, management has identified several accounting policies that, due to the estimates, assumptions and judgments inherent in those policies, are critical in understanding our financial statements. These include accounting for business combinations (primarily related to core deposit intangibles and acquired loans) and accounting for the ACL-Loans. There have been no material changes or developments with respect to the assumptions or methodologies that the Company uses when applying what management believes are critical accounting policies and developing critical accounting estimates as previously disclosed in the Company’s Annual Report. Reclassifications Certain 2025 amounts have been reclassified to conform to the presentation used in 2026. These reclassifications had no effect on the operations, financial condition or cash flows of the Company. Updates to Significant Accounting Policies Effective January 1, 2026, the Company adopted Accounting Standards Update (“ASU”) 2025-08, Financial Instruments—Credit Losses (Topic 326): Purchased Financial Assets. Any financial assets purchased after January 1, 2026 (including those acquired as part of the acquisition of Centre 1 Bancorp. Inc. (“Centre”) on January 1, 2026) reflect the application of ASU 2025-08, while financial assets purchased prior to this date will continue to be reported in accordance with previously applicable accounting standards. Recently Issued Not Yet Effective Accounting Standards In October 2023, the Financial Accounting Standards Board (“FASB”) issued ASU 2023-06, Disclosure Improvements. This ASU modifies the disclosure or presentation requirements of a variety of Topics in the Codification. The amendments in this ASU are expected to clarify or improve disclosure and presentation requirements for certain codification topics. The effective date for each amendment will be the date on which the Security and Exchange Commission’s removal of that related disclosure from Regulation S-X or Regulation S-K becomes effective, with early adoption prohibited. If, by June 30, 2027, the Securities and Exchange Commission has not removed the applicable requirement from Regulation S-X or Regulation S-K, the pending content of the related amendment will be removed from the Codification and will not become effective for any entity. The Company does not anticipate a significant impact to its financial statement disclosures as a result of this ASU. In November 2024, the FASB issued ASU 2024-03, Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures (Topic 220): Disaggregation of Income Statement Expenses. This ASU is intended to improve the disclosures about a public entity’s income statement expense categories and addresses requests from investors and other decision makers for additional, more detailed information about income statement expense categories. The amendment applies to all public entities that are required to report income statement categories in accordance with Topic 280. The effective date for this update was amended by ASU 2025-01, Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date, and is now effective for annual periods beginning after December 15, 2026, and interim reporting periods within annual reporting periods beginning after December 15, 2027.

BASIS OF PRESENTATION

3 Months Ended

Mar. 31, 2026

NOTE 1 – BASIS OF PRESENTATION

Bank First Corporation (the “Company”) provides a variety of financial services to individual and corporate customers through its wholly-owned subsidiary, Bank First, N.A. (the “Bank”). The Bank operates as a full-service financial institution with a primary market area including, but not limited to, the counties in which the Bank’s branches are located. The Bank has thirty-eight locations located in Brown, Columbia, Dane, Door, Fond du Lac, Green, Jefferson, Manitowoc, Monroe, Outagamie, Ozaukee, Rock, Shawano, Sheboygan, Walworth, Waupaca, Waushara, and Winnebago counties in the State of Wisconsin and Winnebago county in the State of Illinois. The Company and Bank are subject to the regulations of certain federal agencies and undergo periodic examinations by those regulatory authorities.

These interim unaudited consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) for interim financial information and with the instructions to Quarterly Report on Form 10-Q and Article 10 of Regulation S-X. Accordingly, certain information and footnote disclosures required by GAAP have been omitted or abbreviated. These unaudited consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and footnotes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025 (“Annual Report”).

The unaudited consolidated financial statements include all adjustments, consisting of normal recurring adjustments, necessary for a fair presentation of the results for the interim periods. The results for interim periods are not necessarily indicative of results for a full year.

Critical Accounting Policies and Estimates

The accounting and reporting policies of the Company conform to GAAP in the United States and general practices within the financial institution industry. To prepare financial statements in conformity with GAAP, management makes estimates, assumptions and judgments based on available information. These estimates, assumptions and judgments are based on information available as of the date of the financial statements and, as this information changes, actual results could differ from the estimates, assumptions and judgments reflected in the financial statement. As disclosed in the Company’s Annual Report, management has identified several accounting policies that, due to the estimates, assumptions and judgments inherent in those policies, are critical in understanding our financial statements. These include accounting for business combinations (primarily related to core deposit intangibles and acquired loans) and accounting for the ACL-Loans.

There have been no material changes or developments with respect to the assumptions or methodologies that the Company uses when applying what management believes are critical accounting policies and developing critical accounting estimates as previously disclosed in the Company’s Annual Report.

Reclassifications

Certain 2025 amounts have been reclassified to conform to the presentation used in 2026. These reclassifications had no effect on the operations, financial condition or cash flows of the Company.

Updates to Significant Accounting Policies

Effective January 1, 2026, the Company adopted Accounting Standards Update (“ASU”) 2025-08, Financial Instruments—Credit Losses (Topic 326): Purchased Financial Assets. Any financial assets purchased after January 1, 2026 (including those acquired as part of the acquisition of Centre 1 Bancorp. Inc. (“Centre”) on January 1, 2026) reflect the application of ASU 2025-08, while financial assets purchased prior to this date will continue to be reported in accordance with previously applicable accounting standards.

Recently Issued Not Yet Effective Accounting Standards

In October 2023, the Financial Accounting Standards Board (“FASB”) issued ASU 2023-06, Disclosure Improvements. This ASU modifies the disclosure or presentation requirements of a variety of Topics in the Codification. The amendments in this ASU are expected to clarify or improve disclosure and presentation requirements for certain codification topics. The effective date for each amendment will be the date on which the Security and Exchange Commission’s removal of that related disclosure from Regulation S-X or Regulation S-K becomes effective, with early adoption prohibited. If, by June 30, 2027, the Securities and Exchange Commission has not removed the applicable requirement from Regulation S-X or Regulation S-K, the pending content of the related amendment will be removed from the Codification and will not become effective for any entity. The Company does not anticipate a significant impact to its financial statement disclosures as a result of this ASU.

In November 2024, the FASB issued ASU 2024-03, Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures (Topic 220): Disaggregation of Income Statement Expenses. This ASU is intended to improve the disclosures about a public entity’s income statement expense categories and addresses requests from investors and other decision makers for additional, more detailed information about income statement expense categories. The amendment applies to all public entities that are required to report income statement categories in accordance with Topic 280. The effective date for this update was amended by ASU 2025-01, Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date, and is now effective for annual periods beginning after December 15, 2026, and interim reporting periods within annual reporting periods beginning after December 15, 2027.