Sec Form 3 Filing - CB Co-Investment LLC @ Chain Bridge I - 2024-02-07

FORM 3 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 CB Co-Investment LLC 2. Issuer Name and Ticker or Trading Symbol Chain Bridge I [ CBRG] 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) 599 LEXINGTON AVENUE, 20TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 02/07/2024 (Street) NEW YORK, NY10022 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ 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 Ordinary Shares 575,665 D ( 1 )

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 CB Co-Investment LLC 599 LEXINGTON AVENUE, 20TH FLOOR NEW YORK, NY10022 X Cowen Investments II LLC 599 LEXINGTON AVENUE, 20TH FLOOR NEW YORK, NY10022 X RCG LV Pearl LLC 599 LEXINGTON AVENUE, 20TH FLOOR NEW YORK, NY10022 X COWEN INC. 599 LEXINGTON AVENUE, 20TH FLOOR NEW YORK, NY10022 X Signatures CB Co-Investment LLC, By: Cowen Investments II LLC, sole member, By: RCG LV Pearl LLC, sole member, By: Cowen Inc., sole member, By: /s/ Stephen Lasota, Chief Financial Officer 02/20/2024 Signature of Reporting Person Date Cowen Investments II LLC, By: RCG LV Pearl LLC, sole member, By: Cowen Inc., sole member, By: /s/ Stephen Lasota, Chief Financial Officer 02/20/2024 Signature of Reporting Person Date RCG LV Pearl LLC, By: Cowen Inc., sole member, By: /s/ Stephen Lasota, Chief Financial Officer 02/20/2024 Signature of Reporting Person Date Cowen Inc., By: /s/ Stephen Lasota, Chief Financial Officer 02/20/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )CB Co-Investment LLC is the record holder of the securities reported herein. Cowen Investment II LLC is the sole member of CB Co-Investment LLC, RCG is the sole member of Cowen Investment II LLC, and Cowen Inc. is the sole member of RCG. In such capacities, each of Cowen Investment II LLC, RCG and Cowen Inc. may be deemed to beneficially own the securities owned directly by CB Co-Investment LLC, but disclaims beneficial ownership of the securities reported herein except to the extent of its pecuniary interest therein.

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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