RBB Bancorp — Director's Dealing 2025

May 22, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: RBB Bancorp (RBB)
CIK: 0001499422
Period of Report: 2025-05-20

Reporting Person: LIN CHUANG I (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-05-20	Common Stock, No Par Value	M	10000	—	Acquired	48826	Direct
2025-05-21	Common Stock, No Par Value	M	2521	—	Acquired	51347	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2024-05-17	Option (right to buy)	$13.2098	M	10250	Disposed	2024-05-21	Common Stock (10250)	Direct
2025-05-20	Option (right to buy)	$17.08	M	10000	Disposed	2025-05-20	Common Stock (10000)	Direct
2025-05-21	Restricted Stock Units	$0	M	2521	Disposed		Restricted Stock Units (3221)	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Option (right to buy)	$18.2500	2026-05-17	Common Stock (10000)	10000	Direct

Footnotes

F1: These options vest in three equal annual installments beginning one year after the 05/21/2014 date of grant.

F2: These options vest in three equal annual installments beginning one year after the 05/17/2016 date of grant.

F3: There will be no expiration date once restricted stock units vest.

F4: These restricted stock units granted on 5/21/2025 vest in two installments:2,521 immediately vested on date of grant and 700 vest in one year from the date of grant