FIRST BUSEY CORP /NV/

The table below presents Busey’s Consolidated Average Balance Sheets, summarizing average balances for each major category of assets and liabilities, the interest income earned on interest-earning assets, the interest expense paid for interest-bearing liabilities, and the related interest yields for the periods indicated. Average information is provided on a daily average basis:

First Busey Corporation(BUSE) | 2026 Q3 — 72

1. On a tax-equivalent basis and assuming a federal income tax rate of 21.0%. For a reconciliation of non-GAAP measures to the most directly comparable GAAP financial measures, see“Non-GAAP Financial Information” included in this MD&A.

2. Non-accrual loans are included in average portfolio loans.

3. Interest income includes tax-equivalent adjustments of $0.9 million for the three months ended September 30, 2026, and $0.8 million for the three months ended September 30, 2025.

4. Includes short-term and long-term borrowings. Interest expense includes non-usage fees on a revolving line of credit.

5. Annualized.

First Busey Corporation(BUSE) | 2026 Q3 — 73

1. On a tax-equivalent basis and assuming a federal income tax rate of 21.0%. For a reconciliation of non-GAAP measures to the most directly comparable GAAP financial measures, see“Non-GAAP Financial Information” included in this MD&A.

2. Non-accrual loans have been included in average portfolio loans.

3. Interest income includes tax-equivalent adjustments of $2.6 million for the nine months ended September 30, 2026, and $2.1 million for the nine months ended September 30, 2025, respectively.

4. Includes short-term and long-term borrowings. Interest expense includes non-usage fees on a revolving line of credit.

5. Annualized.

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Notable changes in average assets and average liabilities are summarized as follows:

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Changes in net interest income and net interest margin are summarized as follows:

1. Assuming a federal income tax rate of 21.0%. For a reconciliation of non-GAAP measures to the most directly comparable GAAP financial measures, see“Non-GAAP Financial Information” included in this MD&A.

2. Net interest income expressed as a percentage of average earning assets, stated on a tax-equivalent basis.

The Federal Open Market Committee raised rates by 25 bps during the third quarter of 2026. Rising rates initially have a positive impact on net interest margin, as assets, in particular commercial loans, reprice more quickly and to a greater extent than liabilities. As deposit and funding costs increase in response to the tightening rate cycle, and Busey experiences deposit migration into higher cost offerings and funding alternatives, some of the net interest margin expansion is reversed.

Busey continues to evaluate and execute off-balance sheet hedging and balance sheet strategies as well as embedding rate protection in asset originations to provide consistent and predictable net interest income performance across different interest rate environments. Busey continues strategic efforts to grow core customer deposits.

Net interest spread represents the difference between the average rate earned on earning assets and the average rate paid on interest-bearing liabilities, and is presented in the table below:

1. Net interest spread is calculated on a tax-equivalent basis.

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Annualized net interest margins for the quarterly periods indicated were as follows:

Management attempts to mitigate the effects of a shifting interest-rate environment through effective portfolio management, prudent loan underwriting and pricing discipline, and operational efficiencies. For a description of accounting policies underlying the recognition of interest income and expense, refer to the Notes to Consolidated Financial Statements in Busey’s 2025 Annual Report.