X0508 4 2022-11-29 0001901637 USCB FINANCIAL HOLDINGS, INC. USCB 0001916995 ABADIN RAMON C/O USCB FINANCIAL HOLDINGS, INC. 2301 N.W. 87TH AVENUE DORAL FL 33172 1 0 Class A Voting Common Stock 2022-11-29 4 P 0 2500 13.36 A 26133 D Class A Voting Common Stock 2023-03-15 4 P 0 5990 11 A 32123 D Class A Voting Common Stock 2023-09-14 4 P 0 1990 10.86 A 31113 D Stock Option (Right to Buy) 7.5000 2018-01-23 2027-01-23 Class A Voting Stock 5000 5000 D Stock Option (Right to Buy) 11.3500 2020-09-23 2029-09-23 Class A Voting Stock 4000 4000 D The price reported in Column 4 is a weighted average price. The shares were purchased in multiple transactions at prices ranging from $10.96 to $11.01, inclusive. The reporting person undertakes to provide to USCB Financial Holdings, Inc. ("USCB"), any securities holder of USCB, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1) and (2) to this Form 4. The price reported in Column 4 is a weighted average price. The shares were purchased in multiple transactions at prices ranging from $10.85 to $10.95, inclusive. On June 27, 2023, the reporting person transferred 3,000 shares of USCB Class A Voting Common Stock to his ex-wife pursuant to a domestic relations order. /s/ Robert Anderson by P.O.A. for Ramon Abadin 2024-03-12