STOCK TITAN

Chain Bridge Bancorp (CBNA) director buys 400 shares at $44

(Neutral)
(Positive)
Form Type
4

Rhea-AI Filing Summary

Chain Bridge Bancorp director Mark Martinelli purchased 400 shares of Class A Common Stock on 2026-07-29 at $44.00 per share in an open-market or private transaction. Following this buy, he directly holds 3,000 shares. The transaction was reported as a non-derivative equity purchase.

Positive

  • None.

Negative

  • None.
Insider MARTINELLI MARK
Role Director
Bought 400 shs ($18K)
Type Security Shares Price Value
Purchase Class A Common Stock 400 $44.00 $18K
Holdings After Transaction: Class A Common Stock — 3,000 shares (Direct)
Shares purchased 400 shares Class A Common Stock purchased on 2026-07-29
Purchase price $44.00 per share Price paid for Class A Common Stock in the reported transaction
Post-transaction holdings 3,000 shares Direct ownership after the 2026-07-29 purchase
Class A Common Stock financial
"security_title: Class A Common Stock"
Class A common stock is a category of a company’s shares that carries a specific set of ownership rights—most commonly defined voting power and claims on dividends—set out in the company’s charter. For investors it matters because the class determines how much influence you have over corporate decisions, the share’s likely dividend and trading behavior, and how it compares in value to other share classes, like choosing a particular seat with different privileges at the company’s decision-making table.
open market or private transaction financial
"transaction_code_description: Purchase in open market or private transaction"
non-derivative financial
"transaction_type: non-derivative"

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FAQ

What insider share purchase in CBNA was reported for director Mark Martinelli?

Director Mark Martinelli bought 400 shares of Chain Bridge Bancorp Class A Common Stock at $44.00 per share on 2026-07-29. This non-derivative transaction increased his direct ownership to 3,000 shares according to the Form 4 filing.

At what price did Mark Martinelli buy Chain Bridge Bancorp (CBNA) shares?

Mark Martinelli purchased Chain Bridge Bancorp Class A Common Stock at $44.00 per share. The transaction, dated 2026-07-29, covered 400 shares in a non-derivative open-market or private transaction as described in the Form 4 data.

How many Chain Bridge Bancorp (CBNA) shares does Mark Martinelli hold after the reported trade?

After the reported purchase, Mark Martinelli directly holds 3,000 shares of Chain Bridge Bancorp Class A Common Stock. This reflects the addition of 400 shares acquired on 2026-07-29 in the non-derivative transaction disclosed.

What type of security did Mark Martinelli buy in the CBNA Form 4 filing?

Mark Martinelli bought Class A Common Stock of Chain Bridge Bancorp in a non-derivative transaction. The filing describes the trade as a purchase in an open-market or private transaction at $44.00 per share for 400 shares.

Was the CBNA insider transaction by Mark Martinelli reported as an open-market trade?

Yes. The Form 4 describes Mark Martinelli’s acquisition of 400 Chain Bridge Bancorp shares as a “Purchase in open market or private transaction.” The trade involved non-derivative Class A Common Stock at $44.00 per share on 2026-07-29.
SEC Form 4
FORM 4UNITED 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*
MARTINELLI MARK

(Last)(First)(Middle)
1445-A LAUGHLIN AVENUE

(Street)
MCLEAN VIRGINIA 22101

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
CHAIN BRIDGE BANCORP INC [ CBNA ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
07/29/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Class A Common Stock07/29/2026P400A$443,000D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
Remarks:
/s/ Hilary Albrecht, attorney-in-fact07/29/2026
** Signature of Reporting PersonDate
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)