NB Bancorp, Inc.

For the period ended Apr 29, 2026. Filed Mar 27, 2026.

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What shareholders are asked to vote on at a company's meeting. It is where to find what directors and top executives are paid, and who owns the most shares.

Apr 29, 2026 · Filed Mar 27, 2026

NBBK$22.09+0.3%Stored close · as of Nov 6, 2026

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No. )

Filed by the Registrant☒

Filed by a Party other than the Registrant☐

Check the appropriate box:

☐Preliminary Proxy Statement

☐Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

☒Definitive Proxy Statement

☐Definitive Additional Materials

☐Soliciting Material Pursuant to § 240.14a-12

NB Bancorp, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

☒No fee required.

☐Fee paid previously with preliminary materials.

☐Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

Notice of Annual Meeting**

of Shareholders and

**Proxy Statement

COMPANY CULTURE

130+ yearsFor the last 130+ years, we’ve worked to help our communities grow and develop with best-in-class products and services that make it possible for anyone to dream, do, and build almost anything.		$1.8MThe Bank is an active partner in the community and surpassed $1.8 million in contributions for 2025. We provide funding to organizations that support health and human services, education, financial literacy and the arts, with a focus on organizations that address social justice, homelessness and food insecurity issues.



		OUR CLIENTSWe are honored to be the trusted advisors of the individuals and businesses who are navigating paths to greater growth and success. With speed, personalized attention, and rock-solid financial stability on their side, our clients will make the difference as they move our communities confidently into the future.
Build something lasting.Build something special.Build something with us.

		OUR COMMUNITYCommunity support isn’t just something that we talk about; it’s something that we do day in and day out because building communities is at the heart of our 130+ year heritage. Needham Bank strives to give over $1.5 million back to the community as charitable contributions annually and proudly supports over 300 local non-profits. Our support goes far beyond just writing a check, we aim to form meaningful and lasting partnerships with the organizations we work with.


March 27, 2026Dear Fellow Stockholder:Two years ago, we completed our initial public offering, generating over $400 million from investors to provide the opportunity to grow the balance sheet and provide returns to our shareholders. Since that time, we have grown our balance sheet by $2.5 billion, which includes the acquisition of Provident Bancorp, Inc. (“Provident Acquisition”) during 2025. 2025 brought many opportunities to continue our strategic initiative, which was initially put into place back in 2018. Excluding the Provident Acquisition during 2025, gross loans grew by 9.8% and core deposits grew by 11.3%, both higher than most of our peers. Additionally, as we continue to effectively manage our capital levels, we completed two share repurchase programs during the year and initiated a quarterly dividend midway through the year. The Provident Acquisition provided us with an expanded physical presence with 7 branches in a market where we were already providing credit to customers. This allows us to grow and move with our customers, while helping us to advance in our technology and innovation. Our operating results for 2025 speak for themselves, with operating net income of $66.7 million, which excludes merger-related and other one-time non-operating expenses, resulting in operating diluted earnings per share of $1.76, and operating return on average assets and equity of 1.21% and 8.73%, respectively. On behalf of the Board of Directors, we urge you to sign, date and return the enclosed proxy card as soon as possible, even if you currently plan to attend the annual meeting. This will not prevent you from voting during the meeting, but will assure that your vote is counted if you are unable to vote during the meeting. Your vote is important, regardless of the number of shares that you own.Our Proxy Statement and the 2025 Annual Report are available at: https://nbbancorp.com/financials/.

Sincerely,

JOSEPH CAMPANELLI****FRANCIS ORFANELLO

Chairman, President & Chief Executive Officer Lead Independent Director

	NB Bancorp, Inc. \| 2026 Proxy Statement 1

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