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$19.92
+$0.29
+1.48%
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NB Bancorp Inc operates as the holding company of Needham Bank. The group's 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: 889.5M IPO Year: 2023
Target Price: $23.50 AVG Volume (30 days): 323.3K
Analyst Decision: Buy Number of Analysts: 2
Dividend Yield:
1.43%
Dividend Payout Frequency: N/A
EPS: 1.34 EPS Growth: 25.23
52 Week Low/High: $15.44 - $22.86 Next Earning Date: 04-22-2026
Revenue: N/A Revenue Growth: N/A
Revenue Growth (this year): 45.15% Revenue Growth (next year): 4.18%
P/E Ratio: 14.67 Index: N/A
Free Cash Flow: 57.4M FCF Growth: N/A

AI-Powered NBBK Daily Prediction

Machine learning model trained on 25+ technical indicators

Updated 3 days ago

AI Recommendation

hold
Model Accuracy: 79.78%
79.78%
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)

CAMPANELLI JOSEPH P

President & CEO

Buy
NBBK Apr 24, 2026

Avg Cost/Share

$19.44

Shares

2,500

Total Value

$48,618.08

Owned After

374,790

Buy
NBBK Apr 24, 2026

Avg Cost/Share

$19.46

Shares

20,000

Total Value

$389,281.00

Owned After

132,402

CAMPANELLI JOSEPH P

President & CEO

Buy
NBBK Mar 19, 2026

Avg Cost/Share

$20.16

Shares

2,500

Total Value

$50,400.00

Owned After

374,790

SEC Form 4

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

374,790

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

Act: -1.23%

5D

+6.97%

$22.10

Act: +3.82%

20D

+5.39%

$21.77

Act: +7.21%

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

​ ​

2025
Q2

Q2 2025 Earnings

8-K

Jul 23, 2025

0001558370-25-009449

NB BANCORP, INC._July 23, 2025 0001979330false00019793302025-07-232025-07-23

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): July 23, 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 July 23, 2025, NB Bancorp, Inc., the holding company for Needham Bank, issued a press release in which it announced its earnings for the quarter ended June 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 July 23, 2025, the Board of Directors of NB Bancorp, Inc. declared a dividend of $0.07 per share. The dividend will be paid August 20, 2025 to stockholders of record as of August 6, 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 July 23, 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: July 23, 2025 By: /s/Jean-Pierre Lapointe

​ ​ Executive Vice President and Chief Financial Officer

​ ​

2025
Q1

Q1 2025 Earnings

8-K

Apr 22, 2025

0001558370-25-005147

NB BANCORP, INC._April 22, 2025 0001979330false00019793302025-04-222025-04-22

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): April 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 April 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 March 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 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.

Description

99.1 ​ Press Release dated April 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: April 22, 2025 By: /s/Jean-Pierre Lapointe

​ ​ Executive Vice President and Chief Financial Officer

​ ​

2024
Q4

Q4 2024 Earnings

8-K

Jan 22, 2025

0001558370-25-000317

NB BANCORP, INC._January 22, 2025 0001979330false00019793302025-01-222025-01-22

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, 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 January 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 December 31, 2024. 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, 2025, the Company also announced a stock repurchase program that authorizes the Company to purchase up to 2,135,287 shares, or 5%, of the Company’s outstanding shares of common stock. ​ Further details of the stock repurchase program are contained in the press release included as Exhibit 99.1 to this Current Report on Form 8-K. ​ Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.

Description

99.1 ​ Press Release dated January 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: January 22, 2025 By: /s/Jean-Pierre Lapointe

​ ​ Executive Vice President and Chief Financial Officer

​ ​

2024
Q3

Q3 2024 Earnings

8-K

Oct 30, 2024

0001558370-24-013971

Form 8-K CFO Resignation and CFO Appointment (02 06 24) (00442682-2).DOCX 0001979330false00019793302024-10-302024-10-30

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 30, 2024

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 30, 2024, 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, 2024. 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 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.

Description

99.1 ​ Press Release dated October 30, 2024

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 30, 2024 By: /s/Jean-Pierre Lapointe

​ ​ Executive Vice President and Chief Financial Officer

​ ​

2024
Q2

Q2 2024 Earnings

8-K

Jul 24, 2024

0001558370-24-010059

Form 8-K CFO Resignation and CFO Appointment (02 06 24) (00442682-2).DOCX 0001979330false00019793302024-07-242024-07-24

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): July 24, 2024

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 July 24, 2024, NB Bancorp, Inc., the holding company for Needham Bank, issued a press release in which it announced its earnings for the quarter ended June 30, 2024. 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 5.02    Departure of Directors or Principal Officers; Election of Directors; Appointment of Principal Officers. ​ Salvatore Rinaldi, the Company’s Chief Operating Officer, notified the Company’s Chief Executive Officer and the Board of Directors on July 24, 2024 that he would be retiring from his role as Chief Operating Officer of the Company and of Needham Bank once his successor is identified and appointed as Chief Operating Officer and begins employment with Needham Bank. The Company is engaged in a search for a replacement. Mr. Rinaldi is expected to remain in his current role until his successor is named and will remain with the Company in a strategic advisory role through the transition of his responsibilities to his successor. ​ Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.

Description

99.1 ​ Press Release dated July 24, 2024

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: July 24, 2024 By: /s/Jean-Pierre Lapointe

​ ​ Executive Vice President and Chief Financial Officer

​ ​

2024
Q1

Q1 2024 Earnings

8-K

Apr 24, 2024

0001558370-24-005626

Form 8-K CFO Resignation and CFO Appointment (02 06 24) (00442682-2).DOCX 0001979330false00019793302024-04-242024-04-24

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): April 24, 2024

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 April 24, 2024, NB Bancorp, Inc., the holding company for Needham Bank, issued a press release in which it announced its earnings for the quarter ended March 31, 2024. 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 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.

Description

99.1 ​ Press Release dated April 24, 2024

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: April 24, 2024 By: /s/Jean-Pierre Lapointe

​ ​ Executive Vice President and Chief Financial Officer

​ ​

2023
Q4

Q4 2023 Earnings

8-K

Feb 29, 2024

0001558370-24-002044

Form 8-K CFO Resignation and CFO Appointment (02 06 24) (00442682-2).DOCX 0001979330false00019793302024-02-282024-02-28

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): February 28, 2024

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 February 28, 2024, NB Bancorp, Inc., the holding company for Needham Bank, issued a press release in which it announced its earnings for the year ended December 31, 2023. 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 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.

Description

99.1 ​ Press Release dated February 28, 2024

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: February 28, 2024 By: Jean-Pierre Lapointe

​ ​ Executive Vice President and Chief Financial Officer

​ ​ ​ ​ ​

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