Hingham Bank Discloses 9.9% Stake in Chain Bridge

Hingham Institution for Savings, through its wholly owned subsidiary Hingham Unpledged Securities Corporation, reports beneficial ownership of 334,137 shares of CHAIN BRIDGE BANCORP INC Class A common stock.

Rhea-AI Filing Summary

Hingham Institution for Savings, through its wholly owned subsidiary Hingham Unpledged Securities Corporation, reports beneficial ownership of 334,137 shares of CHAIN BRIDGE BANCORP INC Class A common stock. This represents 9.9% of the class as of June 30, 2026.

The reporting group has sole voting power and sole dispositive power over all 334,137 shares, with no shared voting or dispositive power. Both entities are organized under the laws of the Commonwealth of Massachusetts, and the filing is signed by the bank’s Chief Financial Officer.

Key Figures

Beneficial ownership: 334,137 shares Percent of class: 9.9 % Sole voting power: 334,137 shares +5 more

8 metrics

Beneficial ownership 334,137 shares Class A common stock beneficially owned as of June 30, 2026

Percent of class 9.9 % Percentage of CHAIN BRIDGE BANCORP INC Class A common stock

Sole voting power 334,137 shares Shares over which Hingham has sole power to vote or direct the vote

Shared voting power 0 shares Shares over which Hingham has shared power to vote

Sole dispositive power 334,137 shares Shares over which Hingham has sole power to dispose

Shared dispositive power 0 shares Shares over which Hingham has shared power to dispose

Par value $0.01 per share Par value of Chain Bridge Bancorp Class A common stock

Signature date 07/20/2026 Date signed by the Chief Financial Officer

Key Terms

beneficially owned, sole voting power, sole dispositive power, parent holding company, +2 more

6 terms

beneficially owned financial

"Item 4. | Ownership (a) | Amount beneficially owned: 334,137"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole voting power financial

"Sole Voting Power 334,137.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

sole dispositive power financial

"Sole Dispositive Power 334,137.00"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

parent holding company regulatory

"If a parent holding company has filed this schedule, pursuant to (ii)(G)"

subsidiary regulatory

"Identification and Classification of the Subsidiary Which Acquired the Security"

A subsidiary is a company that is controlled or owned by a larger company, known as the parent company. Think of it like a branch or division of a bigger organization; it operates separately but is ultimately guided by the parent. For investors, understanding subsidiaries helps clarify how a larger company is structured and where its resources and risks are concentrated.

Schedule 13G regulatory

"Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What percentage of CHAIN BRIDGE BANCORP INC (CBNA) does Hingham Institution for Savings own?

Hingham Institution for Savings reports beneficial ownership of 9.9% of CHAIN BRIDGE BANCORP INC Class A common stock, representing 334,137 shares as of June 30, 2026, held through its wholly owned subsidiary.

How many CBNA shares are beneficially owned by Hingham Institution for Savings?

Hingham Institution for Savings, via its subsidiary, beneficially owns 334,137 shares of CHAIN BRIDGE BANCORP INC Class A common stock, equal to 9.9% of the class, with sole voting and dispositive power over all of these shares.

Does Hingham Institution for Savings share voting power over its CBNA holdings?

No. The filing states sole voting power over 334,137 shares of CHAIN BRIDGE BANCORP INC and shared voting power of 0 shares, indicating all voting authority is held solely, not jointly with others.

Who actually holds the CBNA shares reported by Hingham Institution for Savings?

The CBNA shares are held through Hingham Unpledged Securities Corporation, a wholly owned subsidiary of Hingham Institution for Savings, which acquired the securities and is organized under Massachusetts law, according to the Schedule 13G disclosure.

What type of CBNA security is reported in this Schedule 13G?

The position relates to Class A common stock of CHAIN BRIDGE BANCORP INC, with a par value of $0.01 per share and CUSIP 15746L100, as specified in the ownership disclosure section.

Where are CHAIN BRIDGE BANCORP INC and Hingham Institution for Savings based?

CHAIN BRIDGE BANCORP INC’s principal executive offices are at 1445-A Laughlin Avenue, McLean, Virginia 22101. Hingham Institution for Savings’ principal business office is at 55 Main Street, Hingham, MA 02043, and it is organized under Massachusetts law.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 07/20/2026 - 01:21 PM Learn about SEC filing dates

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)

06/30/2026

(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)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 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 334,137.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 334,137.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

334,137.00

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)

9.9 %

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 Number(s): 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: 334,137
(b)	Percent of class: 9.9 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 334,137
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 334,137
	(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:	07/20/2026