Company: USCB
Filing Date: 2025-05-02
Form Type: S-3
Source: 0001193125-25-111625
Chunk: 59

Company: USCB FINANCIAL HOLDINGS, INC.
Filing Date: 2025-05-02
Form: S-3
Chunk 59
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(8) To file an application for the purpose of determining the eligibility of the trustee to
act under subsection (a) of Section 310 of the Trust Indenture Act in accordance with the rules and regulations prescribed by the SEC under Section 305(b)(2) of the Trust Indenture Act.

II-6

SIGNATURES Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Doral, State of Florida, on May 2, 2025.

| USCB FINANCIAL HOLDINGS, INC. |     |                                       |
| By:                           |     | /s/ Luis de la Aguilera               |
| Name:                         |     | Luis de la Aguilera                   |
| Title:                        |     | President and Chief Executive Officer |

POWER OF ATTORNEY We, the undersigned directors and officers of USCB Financial Holdings, Inc. (the “Registrant”) hereby severally constitute and appoint Luis de la Aguilera and Robert Anderson with full power of substitution, our true and lawful attorneys-in-factand agents for and in his name, place and stead and on his behalf, and in any and all capacities, to execute any and all amendments (including post-effective amendments) to the within registration statement (as well as any registration statement for the same offering covered by this registration statement that is to be effective upon filing pursuant to Rule 462(b) under the Securities Act of 1933), and to file the same, together with all exhibits thereto and all other documents in connection therewith, with the Securities and Exchange Commission and such other agencies, offices and persons as may be required by applicable law, granting unto each said attorney-in-factand agent, each acting alone, full power and authority to do and perform each and every act and thing which said attorney-in-factand agent may deem necessary or advisable to be done or performed in connection with any or all of the above-described matters, as fully as each of the undersigned could do if personally present and acting, hereby ratifying and confirming all that each said attorney-in-factand agent, each acting alone, or his substitute or substitutes, may lawfully do or cause to be done by virtue hereof. Pursuant to