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as of 03-17-2026 10:27am EST

$20.73
$0.23
-1.10%
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NB Bancorp Inc operates as the holding company of Needham Bank. Its business consists of taking deposits from the general public and investing those deposits, together with funds generated from operations, in commercial real estate and multifamily loans, one- to four-family residential real estate loans, construction and land development loans, commercial and industrial loans, consumer loans, and other related services.

Founded: 1892 Country:
United States
United States
Employees: N/A City: NEEDHAM
Market Cap: 1.0B IPO Year: 2023
Target Price: $23.50 AVG Volume (30 days): 299.1K
Analyst Decision: Buy Number of Analysts: 2
Dividend Yield:
1.34%
Dividend Payout Frequency: N/A
EPS: 1.34 EPS Growth: 25.23
52 Week Low/High: $15.09 - $22.70 Next Earning Date: 04-23-2026
Revenue: N/A Revenue Growth: N/A
Revenue Growth (this year): 45.15% Revenue Growth (next year): 4.18%
P/E Ratio: 15.56 Index: N/A
Free Cash Flow: 57.4M FCF Growth: +39.09%

AI-Powered NBBK Daily Prediction

Machine learning model trained on 25+ technical indicators

Updated 15 hours ago

AI Recommendation

hold
Model Accuracy: 67.86%
67.86%
Confidence

Disclaimer: This prediction is generated by an AI model and should not be considered as financial advice. Always conduct your own research and consult with financial professionals before making investment decisions.

Stock Insider Trading Activity of NB Bancorp Inc. (NBBK)

Buy
NBBK Mar 9, 2026

Avg Cost/Share

$20.42

Shares

1,000

Total Value

$20,420.00

Owned After

110,331

SEC Form 4

CAMPANELLI JOSEPH P

President & CEO

Buy
NBBK Mar 6, 2026

Avg Cost/Share

$20.78

Shares

5,000

Total Value

$103,870.00

Owned After

47,000

EVANGELISTA PAUL A

EVP, Dir Spec. Bank. Ctr.

Buy
NBBK Dec 19, 2025

Avg Cost/Share

$20.87

Shares

2,000

Total Value

$41,742.60

Owned After

26,566

SEC Form 4

Earnings Transcripts

SEC 8-K filings with transcript text

View All
2025
Q4

Q4 2025 Earnings

8-K BUY

Jan 22, 2026 · 100% conf.

AI Prediction BUY

1D

+2.88%

$21.26

5D

+6.97%

$22.10

20D

+5.39%

$21.77

Price: $20.66 Prob +5D: 100% AUC: 1.000
0001104659-26-005790

NB BANCORP, INC._January 22, 2026 0001979330false00019793302026-01-222026-01-22

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(D) OF

THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): January 22, 2026

NB BANCORP, INC.

(Exact Name of Registrant as Specified in Charter) ​ ​ ​ ​ ​

Maryland ​ 001-41899 ​ ​ ​ 93-2560883

(State or Other Jurisdiction) ​ (Commission File No.) ​ (I.R.S. Employer

of Incorporation) ​ ​ ​ Identification No.)

​ ​

​ 1063 Great Plain Avenue, Needham, Massachusetts 02492

​ (Address of Principal Executive Offices) (Zip Code)

​ Registrant’s telephone number, including area code: (781) 444-2100 Not Applicable (Former name or former address, if changed since last report) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below): ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class ​ ​ ​ Trading Symbol(s) ​ ​ ​ Name of each exchange on which registered

Common Stock, Par Value $0.01 Per Share ​

NBBK

​ The Nasdaq Stock Market, LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☒ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐ ​ ​ ​

Item 2.02 Results of Operation and Financial Condition.

On January 22, 2026, NB Bancorp, Inc., the holding company for Needham Bank, issued a press release in which it announced its earnings for the quarter ended December 31, 2025. A copy of the press release announcing the results is included as Exhibit 99.1 to this Current Report on Form 8-K and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933. Item 8.01 Other Events.

On January 22, 2026, the Board of Directors of NB Bancorp, Inc. declared a dividend of $0.07 per share. The dividend will be paid February 19, 2026 to stockholders of record as of February 5, 2026. ​ On January 22, 2025, the Board of Directors of NB Bancorp, Inc. also authorized the Company to purchase up to 2,288,509 shares, or 5%, of the Company’s outstanding shares of common stock. ​ A copy of the press release announcing the declaration of the dividend and the adoption of the stock repurchase program is attached to this Current Report on Form 8-K as Exhibit 99.1 and is hereby incorporated by reference. Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit No. ​ ​ ​ Description

99.1 ​ Press Release dated January 22, 2026

104.1 ​ Cover Page Interactive Data File (Embedded within Inline XBRL document)

​ ​ ​ ​ ​

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized. ​

​ ​

NB BANCORP, INC.

​ ​ ​

DATE: January 22, 2026 By: /s/Jean-Pierre Lapointe

​ ​ Executive Vice President and Chief Financial Officer

​ ​

2025
Q3

Q3 2025 Earnings

8-K/A

Oct 23, 2025

0001104659-25-101621

NB BANCORP, INC._October 22, 2025 00019793302025-10-222025-10-22

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K/A

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(D) OF

THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): October 22, 2025

NB BANCORP, INC.

(Exact Name of Registrant as Specified in Charter) ​ ​ ​ ​ ​

Maryland ​ 001-41899

93-2560883

(State or Other Jurisdiction) ​ (Commission File No.) ​ (I.R.S. Employer

of Incorporation) ​ ​ ​ Identification No.)

​ ​

​ 1063 Great Plain Avenue, Needham, Massachusetts 02492

​ (Address of Principal Executive Offices) (Zip Code)

​ Registrant’s telephone number, including area code: (781) 444-2100 Not Applicable (Former name or former address, if changed since last report) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below): ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading Symbol(s)

Name of each exchange on which registered

Common Stock, Par Value $0.01 Per Share ​

NBBK

​ The Nasdaq Stock Market, LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☒ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐ ​ ​ ​

Item 2.02 Results of Operation and Financial Condition.

On October 22, 2025, NB Bancorp, Inc., the holding company for Needham Bank, issued a press release in which it announced its earnings for the quarter ended September 30, 2025. A copy of the press release announcing the results is included as Exhibit 99.1 to this Current Report on Form 8-K and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933. Item 8.01 Other Events.

On October 22, 2025, the Board of Directors of NB Bancorp, Inc. declared a dividend of $0.07 per share. The dividend will be paid November 19, 2025 to stockholders of record as of November 5, 2025. ​ A copy of the press release announcing the declaration of the dividend is attached to this Current Report on Form 8-K as Exhibit 99.1 and is hereby incorporated by reference. Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.

Description

99.1 ​ Press Release dated October 22, 2025

104.1 ​ Cover Page Interactive Data File (Embedded within Inline XBRL document)

​ ​ ​ ​ ​

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized. ​

​ ​

NB BANCORP, INC.

​ ​ ​

DATE: October 22, 2025 By: /s/Jean-Pierre Lapointe

​ ​ Executive Vice President and Chief Financial Officer

​ ​

XBRL-Only Content Section

​ ​

dei_EntityCentralIndexKey 0001979330

dei_AmendmentFlag false

​ ​

​ ​ ​ ​

2025
Q3

Q3 2025 Earnings

8-K

Oct 22, 2025

0001104659-25-101542

NB BANCORP, INC._October 22, 2025 0001979330false00019793302025-10-222025-10-22

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(D) OF

THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): October 22, 2025

NB BANCORP, INC.

(Exact Name of Registrant as Specified in Charter) ​ ​ ​ ​ ​

Maryland ​ 001-41899

93-2560883

(State or Other Jurisdiction) ​ (Commission File No.) ​ (I.R.S. Employer

of Incorporation) ​ ​ ​ Identification No.)

​ ​

​ 1063 Great Plain Avenue, Needham, Massachusetts 02492

​ (Address of Principal Executive Offices) (Zip Code)

​ Registrant’s telephone number, including area code: (781) 444-2100 Not Applicable (Former name or former address, if changed since last report) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below): ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading Symbol(s)

Name of each exchange on which registered

Common Stock, Par Value $0.01 Per Share ​

NBBK

​ The Nasdaq Stock Market, LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☒ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐ ​ ​ ​

Item 2.02 Results of Operation and Financial Condition.

On October 22, 2025, NB Bancorp, Inc., the holding company for Needham Bank, issued a press release in which it announced its earnings for the quarter ended September 30, 2025. A copy of the press release announcing the results is included as Exhibit 99.1 to this Current Report on Form 8-K and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933. Item 8.01 Other Events.

On October 22, 2025, the Board of Directors of NB Bancorp, Inc. declared a dividend of $0.07 per share. The dividend will be paid November 19, 2025 to stockholders of record as of November 5, 2025. ​ A copy of the press release announcing the declaration of the dividend is attached to this Current Report on Form 8-K as Exhibit 99.1 and is hereby incorporated by reference. Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.

Description

99.1 ​ Press Release dated October 22, 2025

104.1 ​ Cover Page Interactive Data File (Embedded within Inline XBRL document)

​ ​ ​ ​ ​

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized. ​

​ ​

NB BANCORP, INC.

​ ​ ​

DATE: October 22, 2025 By: /s/Jean-Pierre Lapointe

​ ​ Executive Vice President and Chief Financial Officer

​ ​

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