[Form 4] RBB Bancorp Insider Trading Activity

Rhea-AI Filing Summary

RBB Bancorp director Frank Wong reported equity compensation activity. On May 21, 2026, he exercised restricted stock units to acquire 2,546 shares of common stock and received a new grant of 2,546 restricted stock units. Following these transactions, he directly holds 7,067 common shares and 2,546 restricted stock units.

Insider Trade Summary

2,546 shares exercised/converted

Mixed 5 txns

Insider Wong Frank

Role null

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	700	$0.00	--
Grant/Award	Restricted Stock Units	2,546	$0.00	--
Exercise	Restricted Stock Units	1,846	$0.00	--
Exercise	Common Stock, No Par Value	700	$0.00	--
Exercise	Common Stock, No Par Value	1,846	$0.00	--

Holdings After Transaction: Restricted Stock Units — 0 shares (Direct, null); Common Stock, No Par Value — 5,221 shares (Direct, null)

Footnotes (1)

1. Restricted stock units convert into common stock on a one-for-one basis. On May 21, 2025, the reporting person was granted 3,421 restricted stock units: 2,721 immediately vested and 700 vested on the one year anniversary of the grant date On May 21, 2026, the reporting person was granted 2,546 restricted stock units: 1,846 vested immediately and 700 will vest on the one year anniversary of the grant date.

Key Figures

RSU exercises: 2,546 shares New RSU grant: 2,546 units Common shares held: 7,067 shares +2 more

5 metrics

RSU exercises 2,546 shares Common stock acquired via restricted stock unit exercises on May 21, 2026

New RSU grant 2,546 units Restricted stock units granted on May 21, 2026

Common shares held 7,067 shares Direct common stock holdings following reported transactions

RSUs held 2,546 units Total restricted stock units outstanding after the grant

Derivative exercises count 2 transactions Exercise or conversion events (M code) in transaction summary

Key Terms

Restricted stock units, derivative exercise/conversion, Common Stock, No Par Value, Grant, award, or other acquisition

4 terms

Restricted stock units financial

"The filing notes that restricted stock units convert into common stock on a one-for-one basis."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

derivative exercise/conversion financial

"transaction_action is described as derivative exercise/conversion for several entries."

Common Stock, No Par Value financial

"security_title is listed as Common Stock, No Par Value for non-derivative entries."

Grant, award, or other acquisition financial

"transaction_code_description for the A-coded RSU transaction is Grant, award, or other acquisition."

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Wong Frank

(Last) (First) (Middle)

1055 WILSHIRE BLVD

SUITE 1200

(Street)

LOS ANGELES CALIFORNIA 90017

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
RBB Bancorp [ RBB ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/21/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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
Common Stock, No Par Value	05/21/2026		M		700	A	$0	5,221	D
Common Stock, No Par Value	05/21/2026		M		1,846	A	$0	7,067	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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (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: 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
Restricted Stock Units	(1)	05/21/2026		M			700	(2)	(2)	Common Stock	700	$0	0	D
Restricted Stock Units	(1)	05/21/2026		A		2,546		(3)	(3)	Common Stock	2,546	$0	2,546	D
Restricted Stock Units	(1)	05/21/2026		M			1,846	(3)	(3)	Common Stock	1,846	$0	700	D

Explanation of Responses:

1. Restricted stock units convert into common stock on a one-for-one basis.

2. On May 21, 2025, the reporting person was granted 3,421 restricted stock units: 2,721 immediately vested and 700 vested on the one year anniversary of the grant date

3. On May 21, 2026, the reporting person was granted 2,546 restricted stock units: 1,846 vested immediately and 700 will vest on the one year anniversary of the grant date.

	/s/ Frank Wong	05/26/2026
	** Signature of Reporting Person	Date
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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transactions did Frank Wong report at RBB (RBB)?

Director Frank Wong reported equity compensation transactions. He exercised restricted stock units into 2,546 common shares and received a new grant of 2,546 restricted stock units, increasing his direct equity and maintaining additional stock-based awards.

How many RBB Bancorp shares did Frank Wong acquire in this Form 4?

Frank Wong acquired 2,546 shares of RBB Bancorp common stock through exercises of restricted stock units. These exercises converted previously granted units into common shares at a stated price of $0.00 per share, reflecting non-cash, compensation-related activity.

Did Frank Wong sell any RBB Bancorp stock in this filing?

No, the Form 4 shows no sales of RBB Bancorp stock by Frank Wong. All reported transactions are coded as acquisitions or derivative exercises, with no open-market sales, gifts, or tax-withholding dispositions disclosed in this data set.

What new restricted stock unit grant did Frank Wong receive from RBB Bancorp?

Frank Wong received a grant of 2,546 restricted stock units on May 21, 2026. Footnotes state 1,846 units vested immediately and 700 will vest on the one-year anniversary of the grant date, all convertible into common stock on a one-for-one basis.

What are Frank Wong’s holdings after these RBB Bancorp transactions?

After the reported transactions, one entry shows Frank Wong holding 7,067 shares of RBB Bancorp common stock directly, plus 2,546 restricted stock units. The units represent additional potential shares, subject to the vesting terms described in the footnotes.

How do Frank Wong’s restricted stock units at RBB Bancorp convert to shares?

The filing notes that restricted stock units convert into common stock on a one-for-one basis. Each vested unit becomes one share of RBB Bancorp common stock, with some units vesting immediately and others vesting on specified future anniversaries.