NB Bancorp: Pertento reports 2,049,614 shares (4.6%)

NB Bancorp, Inc. receives an Amendment No. 2 to a Schedule 13G/A disclosing that Pertento Partners LLP, Pertento Advisors LLC and Eduardo Marques each report shared beneficial ownership of 2,049,614 shares of Common Stock, representing 4.6% of the class.

Rhea-AI Filing Summary

NB Bancorp, Inc. receives an Amendment No. 2 to a Schedule 13G/A disclosing that Pertento Partners LLP, Pertento Advisors LLC and Eduardo Marques each report shared beneficial ownership of 2,049,614 shares of Common Stock, representing 4.6% of the class. The filing lists the holders' addresses and a Joint Filing Agreement.

The reported holdings are held on behalf of advisory clients; the filing states none of those clients individually own over 5%.

Insights

Corporate Governance Analyst

Institutional ownership disclosure clarifies shared voting and dispositive power.

The amendment shows shared voting and shared dispositive power over 2,049,614 shares reported by Pertento entities and Eduardo Marques as of 03/31/2026. The filing attaches a Joint Filing Agreement and provides principal addresses.

Implications depend on how those shared rights are exercised; subsequent Form 13D/13G amendments would disclose material changes in ownership or intentions.

Institutional Investor Relations Expert

Disclosure signals passive/advisory client holdings rather than a controlling stake.

The filing explicitly states the securities are directly owned by advisory clients of Pertento Partners LLP and that no single advisory client exceeds 5%. This frames the position as passive under Schedule 13G norms.

Watch for future amendments if ownership or voting arrangements change; cash‑flow treatment and specific client identities are not provided in the excerpt.

Key Figures

Reported shares beneficially owned: 2,049,614 shares Percent of class: 4.6% CUSIP: 63945M107 +2 more

5 metrics

Reported shares beneficially owned 2,049,614 shares Amount reported for Pertento Partners LLP, Pertento Advisors LLC and Eduardo Marques

Percent of class 4.6% Percent of common stock for each reporting person

CUSIP 63945M107 NB Bancorp Common Stock identifier

Report date (cover) 03/31/2026 Date listed near cover information

Signature date 05/15/2026 Signed by Eduardo Marques

Key Terms

Schedule 13G/A, Joint Filing Agreement, Beneficial ownership, Shared dispositive power

4 terms

Schedule 13G/A regulatory

"Amendment No. 2 to Schedule 13G/A reporting beneficial ownership"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

Joint Filing Agreement regulatory

"Exhibit A - Joint Filing Agreement"

Beneficial ownership financial

"Amount beneficially owned: Pertento Partners LLP - 2,049,614"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

Shared dispositive power regulatory

"Shared Dispositive Power 2,049,614.00"

FAQ

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

What does the NB Bancorp (NBBK) Schedule 13G/A Amendment No.2 disclose?

It discloses that Pertento Partners LLP, Pertento Advisors LLC and Eduardo Marques each report shared beneficial ownership of 2,049,614 shares (4.6%) of Common Stock as reported.

Does the filing indicate who holds voting or dispositive power for the shares?

Yes. The filing states shared voting power and shared dispositive power of 2,049,614 shares for each reporting party; sole voting and dispositive power are reported as 0.

Are these shares owned directly by Pertento entities or by advisory clients?

The filing states the securities are directly owned by advisory clients of Pertento Partners LLP, and none of those clients is reported to beneficially own more than 5% of the class.

What legal agreement accompanies the joint filing for NBBK?

The amendment includes an Exhibit A – Joint Filing Agreement signed by the reporting persons to coordinate the joint Schedule 13G/A disclosure and signature responsibilities.

What CUSIP and class are reported in the Schedule 13G/A for NB Bancorp?

The filing identifies the class as Common Stock, par value $0.01 with CUSIP 63945M107, as stated in the cover information.

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

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Accepted by SEC EDGAR 05/15/2026 - 01:35 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 2)

NB Bancorp, Inc.

(Name of Issuer)

Common Stock, par value $0.01 per share

(Title of Class of Securities)

63945M107

(CUSIP Number)

03/31/2026

(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): 63945M107

1

Names of Reporting Persons

Pertento Partners LLP

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

UNITED KINGDOM

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 2,049,614.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,049,614.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,049,614.00

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)

4.6 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

CUSIP Number(s): 63945M107

1

Names of Reporting Persons

Pertento Advisors LLC

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 2,049,614.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,049,614.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,049,614.00

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)

4.6 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

CUSIP Number(s): 63945M107

1

Names of Reporting Persons

Eduardo Marques

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

BRAZIL

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 2,049,614.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,049,614.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,049,614.00

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)

4.6 %

12

Type of Reporting Person (See Instructions)

HC, IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: NB Bancorp, Inc.
(b)	Address of issuer's principal executive offices: 1063 Great Plain Avenue, Needham, Massachusetts 02492
Item 2.
(a)	Name of person filing: Pertento Partners LLP Pertento Advisors LLC Eduardo Marques
(b)	Address or principal business office or, if none, residence: Pertento Partners LLP 111 Park Street London W1K7JL United Kingdom Pertento Advisors LLC 111 Park Street London W1K7JL United Kingdom Eduardo Marques 111 Park Street London W1K7JL United Kingdom
(c)	Citizenship: Pertento Partners LLP -United Kingdom Pertento Advisors LLC - Delaware Eduardo Marques - Brazil
(d)	Title of class of securities: Common Stock, par value $0.01 per share
(e)	CUSIP No.: 63945M107
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: Pertento Partners LLP - 2,049,614 Pertento Advisors LLC - 2,049,614 Eduardo Marques - 2,049,614
(b)	Percent of class: Pertento Partners LLP - 4.6% Pertento Advisors LLC - 4.6% Eduardo Marques - 4.6%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Pertento Partners LLP - 0 Pertento Advisors LLC - 0 Eduardo Marques - 0
	(ii) Shared power to vote or to direct the vote: Pertento Partners LLP - 2,049,614 Pertento Advisors LLC - 2,049,614 Eduardo Marques - 2,049,614
	(iii) Sole power to dispose or to direct the disposition of: Pertento Partners LLP - 0 Pertento Advisors LLC - 0 Eduardo Marques - 0
	(iv) Shared power to dispose or to direct the disposition of: Pertento Partners LLP - 2,049,614 Pertento Advisors LLC - 2,049,614 Eduardo Marques - 2,049,614
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. All of the securities reported in this Schedule 13G are directly owned by advisory clients of Pertento Partners LLP. None of those advisory clients may be deemed to beneficially own more than 5% of the Common Stock, par value $0.01 per share.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
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 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.

Pertento Partners LLP

Signature:	/s/ Eduardo Marques
Name/Title:	Eduardo Marques, Managing Partner
Date:	05/15/2026

Pertento Advisors LLC

Signature:	/s/ Eduardo Marques
Name/Title:	Eduardo Marques, Authorized Person
Date:	05/15/2026

Eduardo Marques

Signature:	/s/ Eduardo Marques
Name/Title:	Eduardo Marques
Date:	05/15/2026

Exhibit Information

Exhibit A - Joint Filing Agreement