NB Bancorp exec sells 2,000 shares at $22.93

NB Bancorp, Inc. (NBBK) reports that EVP and Chief Credit Officer Kevin Henkin sold 2,000 shares of common stock on August 14, 2026 at $22.93 per share in an open-market or private transaction.

Rhea-AI Filing Summary

NB Bancorp, Inc. (NBBK) reports that EVP and Chief Credit Officer Kevin Henkin sold 2,000 shares of common stock on August 14, 2026 at $22.93 per share in an open-market or private transaction. Following this sale, he holds 6,874 direct shares, some of which are restricted stock that vest 33 1/3% per year starting February 25, 2027. He also reports indirect ownership of 5,342 shares via a 401(k) and 2,964 shares via an ESOP, with those plan-related amounts noted as transactions not required to be reported under Section 16.

Insider Trade Summary

Net Seller: 2,000 shares

Net Sell 3 txns

Insider Henkin Kevin

Role EVP, Chief Credit Officer

Sold 2,000 shs ($46K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	2,000	$22.93	$46K
holding	Common Stock F2	--	--	--
holding	Common Stock F2	--	--	--

Holdings After Transaction: Common Stock — 6,874 shares (Direct); Common Stock — 5,342 shares (Indirect, By 401(k)); Common Stock — 2,964 shares (Indirect, By ESOP)

Footnotes (2)

1. F1. Shares of restricted stock vest at a rate of 33 1/3% per year commencing on February 25, 2027.
2. F2. Reflects transactions not required to be reported pursuant to Section 16 of the Securities Exchange Act of 1934, as amended.

Key Figures

Shares sold: 2,000 shares Sale price per share: $22.93 per share Direct holdings after sale: 6,874 shares +4 more

7 metrics

Shares sold 2,000 shares Common stock sold on August 14, 2026

Sale price per share $22.93 per share Price for the 2,000 common shares sold

Direct holdings after sale 6,874 shares Direct common stock ownership following the transaction

Indirect 401(k) holdings 5,342 shares Indirect ownership reported as held by 401(k)

Indirect ESOP holdings 2,964 shares Indirect ownership reported as held by ESOP

Restricted stock vesting rate 33 1/3% per year Restricted shares vesting beginning February 25, 2027

Restricted stock vesting start date February 25, 2027 Commencement date for annual vesting of restricted stock

Key Terms

restricted stock, Section 16 of the Securities Exchange Act of 1934, 401(k), ESOP

4 terms

restricted stock financial

"Shares of restricted stock vest at a rate of 33 1/3% 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.

Section 16 of the Securities Exchange Act of 1934 regulatory

"Reflects transactions not required to be reported pursuant to Section 16 of the Securities"

A provision of federal securities law that requires company insiders—directors, officers and large shareholders—to publicly report their stock holdings and trades and to surrender any “short-swing” profits from purchases and sales within a six-month window. It acts like a rule that forces leaders to announce their trades and prevents quick buy-sell windfalls, giving investors transparency into insider activity and reducing opportunities for unfair gain.

401(k) financial

"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.

ESOP financial

"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.

FAQ

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

What insider transaction did NBBK executive Kevin Henkin report on this Form 4?

Kevin Henkin reported selling 2,000 shares of NB Bancorp (NBBK) common stock on August 14, 2026 at $22.93 per share. The sale was classified as a non-derivative open-market or private transaction in common stock.

How many NB Bancorp (NBBK) shares does Kevin Henkin own directly after the reported sale?

After the August 14, 2026 sale, Kevin Henkin directly owns 6,874 shares of NB Bancorp common stock. The filing notes that some of these are restricted stock that vest at 33 1/3% per year beginning February 25, 2027.

What indirect NB Bancorp (NBBK) holdings does Kevin Henkin report in this Form 4?

Kevin Henkin reports indirect ownership of 5,342 shares of NB Bancorp common stock through a 401(k) and 2,964 shares through an ESOP. These plan-related entries reflect transactions not required to be reported under Section 16.

At what price per share were Kevin Henkin’s NB Bancorp (NBBK) shares sold?

The 2,000 NB Bancorp shares were sold at a reported price of $22.93 per share on August 14, 2026. This price is stated as a per-share transaction price for the non-derivative common stock sale.

How do the restricted NB Bancorp (NBBK) shares reported by Kevin Henkin vest?

The filing states that certain restricted NB Bancorp shares vest at 33 1/3% per year, starting on February 25, 2027. This means the restricted stock vests in three equal annual installments beginning on that date.

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

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Available on EDGAR 08/18/2026 - 04:06 PM Accepted by SEC EDGAR 08/18/2026 - 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^*

Henkin Kevin

(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)
	EVP, Chief Credit Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/14/2026

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	08/14/2026		S		2,000	D	$22.93	6,874(1)	D
Common Stock								5,342(2)	I	By 401(k)
Common Stock								2,964(2)	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. Shares of restricted stock vest at a rate of 33 1/3% per year commencing on February 25, 2027.

2. Reflects transactions not required to be reported pursuant to Section 16 of the Securities Exchange Act of 1934, as amended.

Remarks:

Exhibit List: Exhibit 24 - Power of Attorney

	/s/ Kate Henry, by Power of Attorney	08/18/2026
	** 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)