RBB Bancorp (RBB) director exercises RSUs, adds 2,662 shares and receives new grant

Rhea-AI Filing Summary

RBB Bancorp director James Kao reported compensation-related equity activity involving restricted stock units and common shares. On May 21, 2026, he exercised restricted stock units to acquire a total of 2,662 shares of common stock at a conversion price of $0.00 per share, and his direct common stock holdings changed around 566,724 shares after these transactions. He also received a new grant of 2,662 restricted stock units, of which 1,962 vested immediately into common stock and 700 are scheduled to vest on the one-year anniversary of the grant date, according to the footnotes.

Insider Trade Summary

2,662 shares exercised/converted

Mixed 5 txns

Insider Kao James

Role null

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	700	$0.00	--
Grant/Award	Restricted Stock Units	2,662	$0.00	--
Exercise	Restricted Stock Units	1,962	$0.00	--
Exercise	Common Stock, No Par Value	700	$0.00	--
Exercise	Common Stock, No Par Value	1,962	$0.00	--

Holdings After Transaction: Restricted Stock Units — 0 shares (Direct, null); Common Stock, No Par Value — 564,762 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 5,242 restricted stock units: 4,542 immediately vested and 700 vested on the one year anniversary of the grant date. On May 21, 2026, the reporting person was granted 2,662 restricted stock units: 1,962 vested immediately and 700 will vest on the one year anniversary of the grant date.

Key Figures

Common shares acquired via RSU exercise: 2,662 shares New RSU grant: 2,662 units Immediately vested RSUs from 2026 grant: 1,962 units +3 more

6 metrics

Common shares acquired via RSU exercise 2,662 shares Exercises on May 21, 2026

New RSU grant 2,662 units Grant on May 21, 2026

Immediately vested RSUs from 2026 grant 1,962 units Vested on May 21, 2026

RSUs scheduled to vest in one year 700 units From May 21, 2026 grant

Common shares held after transaction 566,724 shares Direct holdings after one reported transaction

Exercise price per RSU $0.00 per share Conversion of RSUs into common stock

Key Terms

Restricted Stock Units, derivative security, Grant, award, or other acquisition, one-for-one basis, +1 more

5 terms

Restricted Stock Units financial

"On May 21, 2026, the reporting person was granted 2,662 restricted stock units"

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 security financial

"transaction_code_description": "Exercise or conversion of derivative security""

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

Grant, award, or other acquisition financial

"transaction_code_description": "Grant, award, or other acquisition""

one-for-one basis financial

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

Common Stock, No Par Value financial

"security_title": "Common Stock, No Par Value""

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^*

Kao James

(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	564,762	D
Common Stock, No Par Value	05/21/2026		M		1,962	A	$0	566,724	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		2,662		(3)	(3)	Common Stock	2,662	$0	2,662	D
Restricted Stock Units	(1)	05/21/2026		M			1,962	(3)	(3)	Common Stock	1,962	$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 5,242 restricted stock units: 4,542 immediately vested and 700 vested on the one year anniversary of the grant date.

3. On May 21, 2026, the reporting person was granted 2,662 restricted stock units: 1,962 vested immediately and 700 will vest on the one year anniversary of the grant date.

Remarks:

	/s/ James Kao	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 did RBB Bancorp (RBB) director James Kao report in this Form 4?

Director James Kao reported equity compensation activity, including exercising restricted stock units into 2,662 common shares and receiving a new grant of 2,662 restricted stock units on May 21, 2026. These are routine non-cash compensation transactions rather than open-market trades.

How many RBB Bancorp shares did James Kao acquire through exercises?

James Kao exercised restricted stock units into a total of 2,662 shares of RBB Bancorp common stock. The transactions were coded as M, meaning exercises or conversions of derivative securities, all at a stated conversion price of $0.00 per share for these awards.

What new restricted stock unit grant did James Kao receive from RBB Bancorp?

On May 21, 2026, James Kao was granted 2,662 restricted stock units. The footnotes state that 1,962 units vested immediately, while 700 units will vest on the one-year anniversary of the grant date, all convertible into common stock on a one-for-one basis.

How many RBB Bancorp shares does James Kao hold after these transactions?

After the reported transactions, one line in the filing shows James Kao directly holding 566,724 shares of RBB Bancorp common stock. This figure provides context for the size of the equity compensation events relative to his overall reported share position.

What do the Form 4 transaction codes M and A mean in James Kao’s filing?

In this filing, code M indicates the exercise or conversion of derivative securities, here restricted stock units converting into common shares. Code A reflects a grant or award acquisition of restricted stock units as part of Kao’s equity compensation from RBB Bancorp.

How do James Kao’s RSUs convert into RBB Bancorp common stock?

According to the footnotes, restricted stock units convert into common stock on a one-for-one basis. This means each vested RSU becomes one share of RBB Bancorp common stock upon settlement, as seen in Kao’s 2,662-share total from recent RSU vesting and exercises.