RBB Bancorp (RBB) director converts 700 restricted stock units into common shares

Rhea-AI Filing Summary

RBB Bancorp director LIN CHUANG I exercised previously granted restricted stock units into common shares. On May 21, 2026, 700 restricted stock units converted into 700 shares of Common Stock at $0.00 per share, reflecting the one-for-one RSU-to-stock conversion noted in the footnotes.

Following this non-cash derivative exercise, the director directly owned 52,047 shares of RBB Bancorp common stock. The RSUs related to this grant were fully exhausted, with the footnotes explaining that 2,521 units vested immediately at grant and 700 vested on the one-year anniversary.

Insights

Banking equity analyst

Director converts 700 RSUs to shares, a routine compensation event.

Director LIN CHUANG I converted 700 restricted stock units into 700 RBB Bancorp common shares at $0.00 per share. This is a standard derivative exercise tied to equity compensation, not an open-market purchase or sale.

The filing shows 52,047 common shares held directly after the transaction, indicating the exercise is small relative to the director’s overall stake. With no remaining RSUs from this grant and no sales reported, the transaction primarily reflects equity compensation vesting rather than a change in investment outlook.

Insider Trade Summary

700 shares exercised/converted

Mixed 2 txns

Insider LIN CHUANG I

Role null

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	700	$0.00	--
Exercise	Common Stock, No Par Value	700	$0.00	--

Holdings After Transaction: Restricted Stock Units — 0 shares (Direct, null); Common Stock, No Par Value — 52,047 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 3,221 restricted stock units: 2,521 immediately vested and 700 vested on the one year anniversary of the grant date.

Key Figures

RSUs exercised: 700 units Common shares received: 700 shares Price per share: $0.00 per share +3 more

6 metrics

RSUs exercised 700 units Restricted stock units converted to common stock on May 21, 2026

Common shares received 700 shares Shares of Common Stock, No Par Value, from RSU conversion

Price per share $0.00 per share Conversion price for RSUs into common stock

Shares held after 52,047 shares Total common shares directly owned after the transaction

RSU grant size 3,221 units Total restricted stock units granted per footnote

Immediately vested RSUs 2,521 units Portion of RSU grant that vested immediately on grant date

Key Terms

Restricted Stock Units, derivative exercise/conversion, non-derivative, Common Stock, No Par Value

4 terms

Restricted Stock Units financial

"The filing lists transactions in "Restricted Stock Units" that 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

"The transaction_action field describes the event as a "derivative exercise/conversion" of restricted stock units."

non-derivative financial

"One transaction is labeled "non-derivative" for the newly issued common stock received from the RSU conversion."

Common Stock, No Par Value financial

"The security title for the acquired shares is listed as "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

X

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^*

LIN CHUANG I

(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	52,047	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

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 3,221 restricted stock units: 2,521 immediately vested and 700 vested on the one year anniversary of the grant date.

	/s/ Chuang-I Lin	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 (RBB Bancorp) director LIN CHUANG I report in this Form 4?

The director reported exercising 700 restricted stock units into 700 shares of RBB Bancorp common stock at $0.00 per share. This non-cash conversion increased directly held common shares to 52,047, with no open-market buying or selling disclosed in the filing.

Was the RBB Bancorp Form 4 transaction a stock sale or purchase?

The Form 4 does not show an open-market sale or purchase. It reports a derivative exercise where 700 restricted stock units converted into 700 common shares at $0.00 per share, reflecting equity compensation vesting rather than trading in the market.

How many RBB Bancorp shares does LIN CHUANG I hold after this filing?

After the reported transactions, LIN CHUANG I directly holds 52,047 shares of RBB Bancorp common stock. This total comes after converting 700 restricted stock units into common shares, with no remaining RSUs from this specific grant shown in the filing.

What do the restricted stock unit footnotes in RBB’s Form 4 explain?

The footnotes state that restricted stock units convert into common stock on a one-for-one basis. They also explain that 3,221 RSUs were granted, with 2,521 vesting immediately and 700 vesting on the one-year anniversary, which aligns with the 700-unit conversion reported.

Is the RBB Bancorp Form 4 transaction a routine compensation event?

Yes. The Form 4 describes conversion of 700 restricted stock units into common stock at $0.00 per share, typical for equity awards. The absence of any reported open-market sales or purchases suggests this is routine compensation vesting rather than a discretionary trading decision.