Sec Form 4 Filing - Friedman Martin S. @ CHAIN BRIDGE BANCORP INC - 2025-02-21

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

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, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Friedman Martin S. 2. Issuer Name and Ticker or Trading Symbol CHAIN BRIDGE BANCORP INC [ CBNA] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O FJ CAPITAL MANAGEMENT LLC, 7901 JONES BRANCH DR. SUITE 210 3. Date of Earliest Transaction (MM/DD/YY) 02/21/2025 (Street) MCLEAN, VA22102 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 Class A Common Stock 02/21/2025 P 1,088 A $ 24.4856 312,528 I See notes ( 1 ) ( 2 ) Class A Common Stock 02/24/2025 P 16,194 A $ 24.4643 328,722 I See notes ( 1 ) ( 2 ) Class A Common Stock 02/25/2025 P 8,514 A $ 24.1277 338,236 I See notes ( 1 ) ( 2 )

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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 of Derivative Security: 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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Friedman Martin S. C/O FJ CAPITAL MANAGEMENT LLC 7901 JONES BRANCH DR. SUITE 210 MCLEAN, VA22102 X Signatures Martin S. Friedman 03/03/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Martin S. Friedman (the "Reporting Person") is the managing member of FJ Capital Management LLC ("FJ Capital"), which is the managing member of and investment adviser to Financial Opportunity Fund LLC ("FOF) which beneficially owns 338,236 shares (the "Shares") of the Class A common stock of Chain Bridge Bancorp Inc. (the "Issuer"). On February 20, 2025, FJ Capital's beneficial ownership of the shares of the Issuer exceeded the 10% beneficial ownership threshold for purposes of Section 16 of the Securities Exchange Act of 1934, as amended ("Section 16"). ( 2 )The Reporting Person, in his capacity as Managing Member of FJ Capital, has voting and dispositive power of the Shares held by FOF. As such, the Reporting Person may be deemed to be a beneficial owner of the Shares reported herein. The Reporting Person disclaims beneficial ownership of the Shares reported herein and this report shall not be deemed an admission of beneficial ownership of such Shares by the Reporting Person for purposes of Section 16 or for any other purpose.

Remarks: This is a late filing as referenced in the correspondence attached hereto.

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).

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