Sec Form 4 Filing - COLLAZO ANDRES @ USCB FINANCIAL HOLDINGS, INC. - 2026-03-07

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person COLLAZO ANDRES 2. Issuer Name and Ticker or Trading Symbol USCB FINANCIAL HOLDINGS, INC. [ USCB] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) EVP, Operations & IT (Last) (First) (Middle) C/O USCB FINANCIAL HOLDINGS, INC., 2301 N.W. 87TH AVENUE 3. Date of Earliest Transaction (MM/DD/YY) 03/07/2026 (Street) DORAL, FL33172 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A Voting Common Stock 03/07/2026 M 8,000 A $ 7.5 40,950 ( 1 ) D Class A Voting Common Stock 03/07/2026 S 8,000 D $ 18.27 32,950 ( 1 ) D Class A Voting Common Stock 03/08/2026 F 429 D $ 18.45 32,521 ( 1 ) D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Options to Purchase Class A Voting Stock $ 12.05 09/27/2022( 2 ) 09/27/2031 Class A Voting Common Stock 30,000 30,000 D Options to Purchase Class A Voting Stock $ 7.5 03/06/2026 M 8,000 04/25/2017( 3 ) 04/25/2026 Class A Voting Common Stock 8,000 $ 0 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other COLLAZO ANDRES C/O USCB FINANCIAL HOLDINGS, INC. 2301 N.W. 87TH AVENUE DORAL, FL33172 EVP, Operations & IT Signatures /s/ Robert Anderson by P.O.A. for Andres Collazo 03/10/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Includes 948 shares of restricted stock from a grant of 2,846 shares which commenced vesting at a rate of one-third per year on January 22, 2025, 10,000 shares of restricted stock from a grant of 15,000 shares which commenced vesting at a rate of one-third per year on October 28, 2025, 4,042 shares of restricted stock from a grant of 6,064 shares which commenced vesting at a rate of one-third per year commencing on January 21, 2026 and 6,123 shares of restricted stock which vest at a rate of one-third per year commencing on January 27, 2027. ( 2 )The options vested at the rate of one-third per year commencing on September 27, 2022. ( 3 )The options vested at a rate of one-third per year commencing on April 25, 2017.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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