Christina Kao of RBB Bancorp (RBB) logs RSU exercises and new grant

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

RBB Bancorp director Christina Kao reported compensation-related equity activity involving restricted stock units. On May 21, 2026, she exercised RSUs that converted into 2,862 shares of common stock on a one-for-one basis. The same day, she received a new grant of 2,862 RSUs, with 2,162 vesting immediately and 700 scheduled to vest on the one-year anniversary of the grant date. Footnotes also note a prior May 21, 2025 grant of 5,242 RSUs, most of which vested earlier, indicating these are ongoing director equity awards rather than open-market trades.

Insider Trade Summary

2,862 shares exercised/converted

Mixed 5 txns

Insider Kao Christina

Role null

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	700	$0.00	--
Grant/Award	Restricted Stock Units	2,862	$0.00	--
Exercise	Restricted Stock Units	2,162	$0.00	--
Exercise	Common Stock, No Par Value	700	$0.00	--
Exercise	Common Stock, No Par Value	2,162	$0.00	--

Holdings After Transaction: Restricted Stock Units — 0 shares (Direct, null); Common Stock, No Par Value — 223,852 shares (Direct, null)

Footnotes (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 2,862 restricted stock units: 2,162 vested immediately and 700 will vest on the one year anniversary of the grant date.

Key Figures

RSUs exercised into common stock: 2,862 units New RSU grant 2026: 2,862 units Immediate vesting from 2026 grant: 2,162 units +4 more

7 metrics

RSUs exercised into common stock 2,862 units M-code derivative exercises on May 21, 2026

New RSU grant 2026 2,862 units Grant to Christina Kao on May 21, 2026

Immediate vesting from 2026 grant 2,162 units Portion of 2,862 RSUs vesting immediately on grant date

One-year vesting from 2026 grant 700 units Portion of 2,862 RSUs vesting one year after May 21, 2026

RSU grant 2025 5,242 units Grant on May 21, 2025 referenced in footnotes

Immediate vesting from 2025 grant 4,542 units Portion of 5,242 RSUs vesting on May 21, 2025

One-year vesting from 2025 grant 700 units RSUs vesting one year after May 21, 2025

Key Terms

Restricted stock units, Exercise or conversion of derivative security, Grant, award, or other acquisition

3 terms

Restricted stock units financial

"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.

Exercise or conversion of derivative security financial

"transaction_code_description: Exercise or conversion of derivative security"

Grant, award, or other acquisition financial

"transaction_code_description: Grant, award, or other acquisition"

Form 4 Insider Transactions: What Each Field Means →

05/26/2026 - 08:13 PM

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 Christina

(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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock, No Par Value	05/21/2026		M		700	A	$0	223,852	D
Common Stock, No Par Value	05/21/2026		M		2,162	A	$0	226,014	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
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		2,862		⁽³⁾	⁽³⁾	Common Stock	2,862	$0	2,862	D
Restricted Stock Units	⁽¹⁾	05/21/2026		M			2,162	⁽³⁾	⁽³⁾	Common Stock	2,162	$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 2,862 restricted stock units: 2,162 vested immediately and 700 will vest on the one year anniversary of the grant date.

	/s/ Christina 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)

Source: View Original Filing on SEC EDGAR

FAQ

What did Christina Kao report in her latest Form 4 for RBB?

Christina Kao reported equity compensation activity in RBB Bancorp. She exercised restricted stock units converting into 2,862 common shares and received a new grant of 2,862 RSUs on May 21, 2026, reflecting routine director stock awards rather than market purchases or sales.

How many restricted stock units did RBB grant to Christina Kao in 2026?

RBB Bancorp granted Christina Kao 2,862 restricted stock units on May 21, 2026. According to footnotes, 2,162 units vested immediately, while 700 units will vest on the one-year anniversary of the grant date, creating both current and future equity exposure.

How do Christina Kao’s restricted stock units convert into RBB common stock?

Christina Kao’s restricted stock units convert into RBB Bancorp common stock on a one-for-one basis. When RSUs vest and are exercised, each unit delivers one share of common stock, turning deferred equity awards into actual share ownership recorded in the Form 4.

What prior RSU grant to Christina Kao is referenced in the filing footnotes?

Footnotes reference a May 21, 2025 grant of 5,242 restricted stock units to Christina Kao. Of these, 4,542 RSUs vested immediately, and 700 vested on the one-year anniversary, showing a similar structure to the 2026 grant with a mix of immediate and delayed vesting.

Were there any open-market stock purchases or sales by Christina Kao reported?

The Form 4 shows no open-market purchases or sales by Christina Kao. All transactions use codes M and A, covering RSU exercises and grants. These indicate compensation-related equity movements, not discretionary buying or selling of RBB Bancorp shares in the market.