NB Bancorp CFO buys 200 shares at $21.80

NB Bancorp, Inc. (NBBK) reported that officer Jean-Pierre Lapointe, SEVP and CFO, purchased 200 shares of common stock on August 20, 2026 at $21.80 per share in an open-market or private transaction.

Rhea-AI Filing Summary

NB Bancorp, Inc. (NBBK) reported that officer Jean-Pierre Lapointe, SEVP and CFO, purchased 200 shares of common stock on August 20, 2026 at $21.80 per share in an open-market or private transaction. Following this purchase, he directly holds 110,531 shares of common stock, including restricted stock that vests 20% per year beginning April 24, 2026 and 33 1/3% per year beginning February 25, 2027. He also indirectly holds 4,339 shares through a 401(k) plan and 1,779 shares through an ESOP.

Insider Trade Summary

Net Buyer: 200 shares

Net Buy 3 txns

Insider Lapointe Jean-Pierre

Role SEVP and CFO

Bought 200 shs ($4K)

Type	Security	Shares	Price	Value
Purchase	Common Stock F1, F2	200	$21.80	$4K
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 110,531 shares (Direct); Common Stock — 4,339 shares (Indirect, By 401(k)); Common Stock — 1,779 shares (Indirect, By ESOP)

Footnotes (2)

1. F1. Includes shares of restricted stock which vest at a rate of 20% per year commencing on April 24, 2026.
2. F2. Shares of restricted stock vest at a rate of 33 1/3% per year commencing on February 25, 2027.

Key Figures

Shares purchased: 200 shares Purchase price per share: $21.80 Direct holdings after transaction: 110,531 shares +2 more

5 metrics

Shares purchased 200 shares Common Stock purchased on August 20, 2026

Purchase price per share $21.80 Price for the 200-share Common Stock purchase on August 20, 2026

Direct holdings after transaction 110,531 shares Common Stock directly owned by Jean-Pierre Lapointe after the purchase

Indirect 401(k) holdings 4,339 shares Common Stock held indirectly through a 401(k) plan

Indirect ESOP holdings 1,779 shares Common Stock held indirectly through an ESOP

Key Terms

restricted stock, ESOP, 401(k)

3 terms

restricted stock financial

"Includes shares of restricted stock which vest at a rate of 20% per year"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

ESOP financial

"total_shares_following_transaction: "1779.0000" ... nature_of_ownership: "By ESOP""

An Employee Stock Ownership Plan (ESOP) is a program that gives employees ownership shares in their company, often as part of their benefits package. It acts like a company-sponsored savings plan, allowing workers to have a stake in the company's success, which can boost motivation and loyalty. For investors, ESOPs can influence company decisions and stock value, making them an important aspect of corporate ownership and governance.

401(k) financial

"total_shares_following_transaction: "4339.0000" ... nature_of_ownership: "By 401(k)""

A 401(k) is a type of retirement savings plan offered by employers that allows workers to set aside a portion of their paycheck before taxes are taken out. The money saved in a 401(k) can grow over time through investments, helping individuals build funds for their future retirement. It matters to investors because it provides a tax-advantaged way to save and invest for long-term financial security.

FAQ

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

What insider transaction did NBBK disclose for Jean-Pierre Lapointe?

NB Bancorp, Inc. disclosed that SEVP and CFO Jean-Pierre Lapointe purchased 200 shares of common stock on August 20, 2026 at $21.80 per share in an open-market or private transaction.

How many NB Bancorp (NBBK) shares does Jean-Pierre Lapointe own after this transaction?

After the reported purchase, Jean-Pierre Lapointe directly owns 110,531 shares of NB Bancorp common stock and indirectly holds 4,339 shares through a 401(k) plan and 1,779 shares through an ESOP.

Were the NBBK insider transactions made under a Rule 10b5-1 trading plan?

The filing indicates the Rule 10b5-1 checkbox is not checked, so the reported purchase of NB Bancorp (NBBK) common stock by Jean-Pierre Lapointe is not affirmed as being made under a Rule 10b5-1 trading plan.

What is the vesting schedule of Jean-Pierre Lapointe’s restricted NB Bancorp stock?

The filing states that certain restricted NB Bancorp shares held by Jean-Pierre Lapointe vest at 20% per year beginning April 24, 2026, and other restricted shares vest at 33 1/3% per year beginning February 25, 2027.

What types of ownership does Jean-Pierre Lapointe have in NBBK shares?

Jean-Pierre Lapointe has direct ownership of 110,531 NB Bancorp shares and indirect ownership of 4,339 shares through a 401(k) and 1,779 shares through an ESOP, as reported in the filing.

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

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Available on EDGAR 08/21/2026 - 04:06 PM Accepted by SEC EDGAR 08/21/2026 - 04:05 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Lapointe Jean-Pierre

(Last) (First) (Middle)

1063 GREAT PLAIN AVE

(Street)

NEEDHAM MASSACHUSETTS 02492

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
NB Bancorp, Inc. [ NBBK ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SEVP and CFO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/20/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/20/2026		P		200	A	$21.8	110,531(1)(2)	D
Common Stock								4,339	I	By 401(k)
Common Stock								1,779	I	By ESOP

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Includes shares of restricted stock which vest at a rate of 20% per year commencing on April 24, 2026.

2. Shares of restricted stock vest at a rate of 33 1/3% per year commencing on February 25, 2027.

Remarks:

Exhibit List: Exhibit 24 - Power of Attorney

	/s/ Kate Henry, by Power of Attorney	08/21/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)