First Busey Results Presentation Deck

4Q23 Earnings Investor Presentation Granular, Stable Deposit Base Long-tenured Deposit Relationships that are very granular As of 12/31/23 Number of Accounts Avg Balance per Account Avg Customer Tenure Deposit Flows by Type $5,313 $5,312 $5,410 First Busey Corporation | Ticker: BUSE Retail $5,602 Retail 257,000+ $22 thousand 16.5 years $3,438 $3,399 $3,584 Commercial 3/31/2023 Commercial 33,000+ $102 thousand 12.4 years $3,482 6/30/2023 $794 Customers with Account Balances totaling $250K+ Number of customers Median account balance Median customer tenure Estimated Uninsured & Uncollateralized Deposits¹ Estimated Uninsured & Uncollateralized Deposits¹ / Total Deposits $1,065 $1,091 Public 9/30/2023 Since 3/31/23, total deposits up +$490 million, or +5.0% 1 $971 12/31/2023 2023 Q4 5,825 $400 thousand Estimated uninsured & uncollateralized deposits consists of the excess of accounts over $250K FDIC insurance limit, less internal accounts and fully-collateralized accounts (including preferred deposits) | Other deposits include brokered MMA, brokered CDs, ICS Demand & Savings, CDAR CDs 13.8 years 2023 Q4 $2.8 billion 27% $256 $287 $247 Other² $236 18 B

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