NB Bancorp director reports tax share withholding

NB Bancorp, Inc. director Angela Jackson reported a routine tax-withholding disposition of company stock.

Rhea-AI Filing Summary

NB Bancorp, Inc. director Angela Jackson reported a routine tax-withholding disposition of company stock. On April 24, 2026, 4,918 shares of NB Bancorp Common Stock were delivered at $19.82 per share to satisfy tax obligations, rather than sold in the open market. After this transaction, Jackson directly held 76,337 shares of NB Bancorp, including restricted stock that vests 20% per year starting April 24, 2026 and additional restricted stock that vests 100% on January 2, 2027.

Insider Trade Summary

Exercise Price or Tax Liability: 4,918 shares

Exercise Price or Tax Liability 1 txn

Insider Jackson Angela

Role Director

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	4,918	$19.82	$97K

Holdings After Transaction: Common Stock — 76,337 shares (Direct)

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. Includes shares of restricted stock which vest 100% on January 2, 2027.

Key Figures

Tax-withholding shares: 4,918 shares Tax-withholding price: $19.82 per share Shares held after transaction: 76,337 shares

3 metrics

Tax-withholding shares 4,918 shares Common Stock delivered for tax liability on April 24, 2026

Tax-withholding price $19.82 per share Value used for tax-withholding disposition

Shares held after transaction 76,337 shares Direct NB Bancorp Common Stock holdings after tax withholding

Key Terms

tax-withholding disposition, restricted stock, Common Stock

3 terms

tax-withholding disposition financial

"transaction_action: "tax-withholding disposition""

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

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.

Common Stock financial

"security_title: "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

FAQ

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

What insider transaction did NB Bancorp (NBBK) director Angela Jackson report?

Director Angela Jackson reported a tax-withholding disposition of NB Bancorp Common Stock. On April 24, 2026, 4,918 shares were delivered at $19.82 per share to cover tax liabilities, rather than being sold on the open market as a discretionary trade.

How many NB Bancorp (NBBK) shares does Angela Jackson hold after this Form 4?

After the reported tax-withholding disposition, Angela Jackson directly holds 76,337 NB Bancorp Common Stock shares. This figure includes restricted stock that is scheduled to vest over time according to specific vesting dates disclosed in the filing’s footnotes.

Was Angela Jackson’s NB Bancorp (NBBK) transaction an open-market sale?

No, the transaction was classified as a tax-withholding disposition, not an open-market sale. Shares were delivered to satisfy tax obligations associated with equity compensation, which is a mechanical event rather than a discretionary decision to sell shares for cash.

What is the price associated with Angela Jackson’s NB Bancorp tax-withholding shares?

The 4,918 NB Bancorp Common Stock shares used for tax withholding were valued at $19.82 per share. This price is used in the filing to calculate the value of shares delivered to meet tax liabilities tied to her equity compensation awards.

What restricted stock vesting terms are disclosed for Angela Jackson at NB Bancorp (NBBK)?

The filing notes restricted stock that vests 20% per year starting April 24, 2026, and additional restricted stock that vests 100% on January 2, 2027. These vesting schedules affect when she fully earns and can potentially access those shares.

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

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Accepted by SEC EDGAR 04/27/2026 - 02:50 PM EDT 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^*

Jackson Angela

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/24/2026

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	04/24/2026		F		4,918	D	$19.82	76,337(1)(2)	D

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. Includes shares of restricted stock which vest 100% on January 2, 2027.

	/s/ Steven Lanter, pursuant to power of attorney	04/27/2026
	** 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)