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For the quarterly period ended March 31, 2026

For the transition period from                           to                          

Commission file number: 001-37700

(Exact Name of Registrant as Specified in its Charter)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

As of April 30, 2026 there were 21,251,905 shares of $0.01 par value common stock outstanding.

* Cash and cash equivalents included $10 million of restricted cash at March 31, 2026, while there was no restricted cash in cash and cash equivalents at March 31, 2025.

In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments necessary to present fairly the consolidated balance sheets, statements of income, comprehensive income (loss), changes in stockholders’ equity, and cash flows of Nicolet Bankshares, Inc. (the “Company” or “Nicolet”) and its subsidiaries, as of and for the periods presented, and all such adjustments are of a normal recurring nature. All material intercompany transactions and balances have been eliminated. The results of operations for the interim periods are not necessarily indicative of the results to be expected for the entire year.

These interim consolidated financial statements have been prepared according to the rules and regulations of the Securities and Exchange Commission and, therefore, certain information and footnote disclosures normally presented in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) have been omitted or abbreviated. These 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.

The Company has determined that its current community bank operating model is structured whereby all banking locations serve a similar base of primarily commercial customers utilizing a company-wide offering of similar products and services managed through similar processes and technology platforms that are collectively reviewed by the Company’s Chief Executive Officer, who has been designated as the chief operating decision maker (“CODM”). The CODM regularly assesses performance of the aggregated single banking segment in determining how to allocate resources.

The banking segment derives revenue from customers by providing a broad array of loan and deposit products to businesses, consumers and government municipalities. The CODM assesses performance of the banking segment and decides how to allocate resources based on net income as reported in the Company’s consolidated statements of income. The measure of segment assets is based on total assets as reported on the consolidated balance sheets. For the periods presented, there were no adjustments or reconciling items between the banking segment net income and consolidated net income as presented in the consolidated statements of income, and there were no adjustments or reconciling items between the banking segment total assets and total assets as presented on the consolidated balance sheets.

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect: the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities as of the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. These estimates are based on information available to management at the time the estimates are made. Actual results could differ from those estimates.

All significant accounting policies followed in the preparation of the quarterly financial statements are disclosed in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025. There have been no changes to these accounting policies during 2026 except as it relates to the accounting for the ACL-loans. During first quarter 2026, the Company transitioned from using a historical loss rate method to a discounted cash flow (“DCF”) method for estimating expected credit losses on segmented loan pools that exhibit similar risk characteristics. There was no change to the ACL methodology as it relates to PCD and other credit-deteriorated loans, which continue to be individually evaluated with a specific reserve established for the aggregate collateral or DCF shortfall.

Under the DCF method, the Company generates cash flow projections at the instrument level wherein payment expectations are adjusted for estimated prepayment speed, curtailments, time to recovery, probability of default, and loss given default. The modeling of expected prepayment speeds, curtailment rates, and time to recovery are based on historical internal data. The Company uses regression analysis of historical internal and peer data to determine which variables are best suited to be economic variables utilized when modeling lifetime probability of default and loss given default. This analysis also determines how expected probability of default and loss given default will react to forecasted levels of the economic variables, which may include the U.S. unemployment, national retail sales, CRE index, and U.S. gross domestic product.

Under the DCF method, management has determined that four quarters represents a reasonable and supportable forecast period and reverts back to a historical loss rate over four quarters on a straight-line basis. Management leverages economic projections from a reputable and independent third party to inform its loss driver forecasts over the four quarter forecast period. Other internal and external indicators of economic forecasts are also considered by management when developing the forecast metrics.

The combination of adjustments for credit expectations (default and loss) and timing expectations (prepayment, curtailment, and time to recovery) produces an expected cash flow stream at the instrument level. Instrument effective yield is calculated, net of the impacts of prepayment assumptions, and the instrument expected cash flows are then discounted at that effective yield to produce an instrument-level net present value of expected cash flows (“NPV”). An ACL is established for the difference between the instrument’s NPV and amortized cost basis. In addition, management utilizes qualitative factors to adjust the calculated ACL as appropriate. Qualitative factors are based on management’s judgment of company, market, industry, or business specific data, changes in underlying loan composition of specific portfolios, changes in collateral values and trends relating to credit quality, delinquency, nonaccrual, or adversely rated loans, and reasonable and supportable forecasts of economic conditions. The transition to the DCF methodology for pooled loan segments did not have a significant impact to the recorded ACL.

In November 2025, the FASB issued ASU 2025-08, Financial Instruments - Credit Losses (Topic 326): Purchased Loans. This ASU expands the scope of the “gross up” method, formerly applicable only to PCD loans, to include non-PCD loans that meet certain criteria, now referred to as “purchased seasoned loans” (“PSLs”). Under this model, an allowance for expected credit losses is recognized at acquisition, offsetting the loan’s amortized cost basis, thereby eliminating the day one credit loss expense previously required for non-PCD loans. PSLs are defined as non-PCD loans acquired (1) through a business combination, or (2) purchased more than 90 days after origination when the acquirer was not involved in the origination. The updated guidance is effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods within those annual reporting periods, with early adoption permitted. The Company early adopted this standard for the acquisition completed in first quarter 2026, as discussed in Note 2.

In September 2025, the FASB issued ASU 2025-06, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software. The amendments in this ASU make targeted improvements in the guidance for the different methods of software development. Specifically, this update removes all references to prescriptive and sequential software development stages; rather, an entity is required to start capitalizing software costs when both of the following occur: management has authorized and committed to funding the software project, and it is probable that the project will be completed and the software will be used to perform the function intended. The updated guidance is effective for annual reporting periods beginning after December 15, 2027.

In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. The amendments in this ASU require disclosure in the notes to financial statements of specified information about certain expenses, such as employee compensation, depreciation, and intangible asset amortization. The updated guidance is effective for annual reporting periods beginning after December 15, 2026.

Certain amounts in the 2025 consolidated financial statements have been reclassified to conform to the 2026 presentation. During first quarter 2026, Nicolet reclassified fully reciprocated deposit balances with ICS from brokered deposits to core deposits to be more consistent with the presentation typically used by peer banks. The ICS reciprocal deposits are part of the IntraFi Network Deposits program, which is used by financial institutions to distribute deposits that exceed FDIC insurance coverage limits to numerous institutions in order to provide insurance coverage for all participating deposits. Prior periods have been restated to reflect this change. There was no change to total deposits or the deposit categories.

MidWestOne Financial Group, Inc. (“MidWestOne”): On February 13, 2026, Nicolet completed its acquisition of MidWestOne. MidWestOne stockholders received 0.3175 shares of Nicolet common stock for each share of MidWestOne common stock owned, resulting in the issuance of approximately 6.6 million shares of Nicolet common stock valued at $1.0 billion (based upon the closing stock price of Nicolet’s common stock on February 13, 2026, of $155.19 per share). With the MidWestOne acquisition, Nicolet is one of the largest community banks in the Upper Midwest.

A summary of the assets acquired and liabilities assumed in the MidWestOne transaction, as of the acquisition date, including the purchase price allocation, was as follows.

The Company purchased loans through the acquisition of MidWestOne for which there was, at the date of acquisition, more than insignificant deterioration of credit quality since origination (purchased credit deteriorated loans or “PCD” loans). The carrying amount of these loans at acquisition was as follows.

The Company accounted for the MidWestOne acquisition under the acquisition method of accounting, and thus, the financial position and results of operations of MidWestOne prior to the consummation date were not included in the accompanying consolidated financial statements. The accounting required assets purchased and liabilities assumed to be recorded at their respective estimated fair values at the date of acquisition, which was determined with the assistance of third party valuations, appraisals, and third party advisors. Initial purchase accounting estimates were recorded during first quarter 2026; however, purchase accounting fair value estimates are subject to refinement for up to one year after the closing date of an acquisition as information relative to closing date fair values becomes available. Goodwill arising as a result of the MidWestOne acquisition is not deductible for tax purposes.

Summary Unaudited Pro Forma Information: The following unaudited pro forma information is presented for illustrative purposes only, and gives effect to the acquisition of MidWestOne as if the acquisition had occurred on January 1, 2025, the beginning of the earliest period presented. The pro forma information should not be relied upon as being indicative of the historical results of operation the companies would have had if the acquisition had occurred before such periods or the future results of operations that the companies will experience as a result of the merger. The pro forma information, although it illustrates the financial characteristics of the combined company under one set of assumptions, does not reflect assumptions regarding expected cost savings, opportunities to earn additional revenue, or other factors that may result as a consequence of the merger and, accordingly, does not attempt to predict or suggest future results.

Basic earnings per common share are calculated by dividing net income by the weighted average number of common shares outstanding during the period. Diluted earnings per common share are calculated by dividing net income by the weighted average number of shares adjusted for the dilutive effect of common stock awards (outstanding stock options and unvested restricted stock), if any. Presented below are the calculations for basic and diluted earnings per common share.

*Cumulative quarterly per share performance may not equal annual per share totals due to the effects of the amount and timing of capital increases. When computing earnings per share for an interim period, the denominator is based on the weighted average shares outstanding during the interim period, and not on an annualized weighted average basis. Accordingly, the sum of the earnings per share data for the quarters will not necessarily equal the year to date earnings per share data.

For both the three months ended March 31, 2026 and March 31, 2025, less than 0.1 million shares were excluded from the calculation of diluted earnings per common share as the effect would have been anti-dilutive.

The Company may grant stock options and restricted stock under its stock-based compensation plan to certain officers, employees, and directors. The plan is administered by a committee of the Board of Directors, and at March 31, 2026, approximately 0.3 million shares were available for grant under this plan. Stock options generally will expire ten years after the date of grant, have an exercise price equal to the Company’s closing stock price on the date of grant, and will become exercisable based upon vesting terms provided for in the grant. Restricted stock grants include time-based restricted stock awards and performance-based restricted stock units, are generally issued at the Company’s closing stock price on the date of grant, and the restrictions lapse based upon the vesting terms provided for in the grant and are contingent upon continued employment.

The Company’s stock option activity is summarized below.

* The terms of the stock option agreements permit having a number of shares of stock withheld, the fair market value of which as of the date of exercise is sufficient to satisfy the exercise price and/or tax withholding requirements. For the three months ended March 31, 2026, 31,995 such shares were withheld by the Company.

Intrinsic value represents the amount by which the fair market value of the underlying stock exceeds the exercise price of the stock options. The intrinsic value of options exercised for the three months ended March 31, 2026 and 2025 was approximately $5.0 million and $3.6 million, respectively.

The Company’s restricted stock awards and restrict stock units activity is summarized below.