Hingham Institution for Savings (CBNA) discloses 8.9% Chain Bridge stake

Rhea-AI Filing Summary

Hingham Institution for Savings filed a Schedule 13G reporting beneficial ownership of 293,565 shares of Chain Bridge Bancorp Inc. Class A common stock, representing 8.9% of the class as of the event date. Hingham and its wholly owned subsidiary, Hingham Unpledged Securities Corporation, have sole voting and dispositive power over these shares.

The filing states the shares were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing control of Chain Bridge Bancorp.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

CHAIN BRIDGE BANCORP INC

(Name of Issuer)

Class A common stock, par value $0.01 per share

(Title of Class of Securities)

15746L100

(CUSIP Number)

12/31/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. 15746L100

1

Names of Reporting Persons

Hingham Institution for Savings

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

MASSACHUSETTS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 293,565.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 293,565.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

293,565.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

8.9 %

12

Type of Reporting Person (See Instructions)

BK

SCHEDULE 13G

Item 1.
(a)	Name of issuer: CHAIN BRIDGE BANCORP INC
(b)	Address of issuer's principal executive offices: 1445-A LAUGHLIN AVENUE, MCLEAN, VIRGINIA, 22101.
Item 2.
(a)	Name of person filing: This Schedule 13G is being jointly filed by Hingham Institution for Savings and its fully owned subsidiary Hingham Unpledged Securities Corporation.
(b)	Address or principal business office or, if none, residence: 55 Main Street, Hingham, MA 02043
(c)	Citizenship: Hingham Institution for Savings and its fully owned subsidiary Hingham Unpledged Securities Corporation are organized under the laws of the Commonwealth of Massachusetts.
(d)	Title of class of securities: Class A common stock, par value $0.01 per share
(e)	CUSIP No.: 15746L100
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 293,565
(b)	Percent of class: 8.9 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 293,565
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 293,565
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. Hingham Institution for Saving acquired the security via its fully owned subsidiary, the Hingham Unpledged Securities Corporation. This Corporation is organized under the laws of the Commonwealth of Massachusetts.
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Hingham Institution for Savings

Signature:	Cristian Melej
Name/Title:	Chief Financial Officer
Date:	01/30/2026

FAQ

What ownership stake in CBNA does Hingham Institution for Savings report?

Hingham Institution for Savings reports beneficial ownership of 293,565 shares of Chain Bridge Bancorp Inc. Class A common stock. This represents 8.9% of the outstanding class, giving Hingham a significant but non‑controlling position according to the Schedule 13G filing.

Does Hingham Institution for Savings seek control of Chain Bridge Bancorp (CBNA)?

The filing states the securities were acquired and are held in the ordinary course of business. It explicitly notes they were not acquired and are not held for the purpose of changing or influencing the control of Chain Bridge Bancorp Inc., consistent with a passive Schedule 13G filing.

Who is the reporting person on this Schedule 13G for CBNA?

The Schedule 13G is jointly filed by Hingham Institution for Savings and its wholly owned subsidiary Hingham Unpledged Securities Corporation. Both entities are organized under the laws of the Commonwealth of Massachusetts and report beneficial ownership in Chain Bridge Bancorp Inc.

What voting and dispositive powers does Hingham report over CBNA shares?

Hingham reports sole power to vote and dispose of 293,565 Chain Bridge Bancorp Inc. shares. It reports zero shared voting power and zero shared dispositive power, indicating all reported authority over these shares is held solely, not jointly, by the reporting entities.

When is the event date for Hingham’s reported CBNA ownership?

The Schedule 13G lists December 31, 2025 as the date of the event requiring the filing. As of that date, Hingham Institution for Savings and its subsidiary reported their 8.9% beneficial ownership position in Chain Bridge Bancorp Inc. Class A common stock.

Who signed the Schedule 13G related to Chain Bridge Bancorp (CBNA)?

The Schedule 13G is signed by Cristian Melej, identified as Chief Financial Officer. The signature section includes a certification that the information in the statement is true, complete, and correct to the best of the signer’s knowledge and belief.