NB Bancorp director reports tax share withholding

NB Bancorp, Inc. director Darcey William reported routine updates to his share holdings.

Rhea-AI Filing Summary

NB Bancorp, Inc. director Darcey William reported routine updates to his share holdings. An entry reflects 80,000 shares of common stock held indirectly through an IRA. In a separate transaction, 4,918 shares were disposed of at $19.82 per share as a tax-withholding disposition, leaving 77,721 shares held directly.

The direct and indirect holdings include restricted stock that vests 20% per year starting on April 24, 2026, and additional restricted stock that vests 100% on January 2, 2027, indicating a portion of his position is tied to future vesting schedules.

Insider Trade Summary

Exercise Price or Tax Liability: 4,918 shares

Exercise Price or Tax Liability 2 txns

Insider Darcey William

Role Director

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

Holdings After Transaction: Common Stock — 77,721 shares (Direct); Common Stock — 80,000 shares (Indirect, By IRA)

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 Direct holdings after transaction: 77,721 shares +3 more

6 metrics

Tax-withholding shares 4,918 shares Common Stock disposed of for tax withholding at $19.82 per share

Tax-withholding price $19.82 per share Price used for 4,918-share tax-withholding disposition

Direct holdings after transaction 77,721 shares Common Stock held directly by Darcey William following tax withholding

Indirect IRA holdings 80,000 shares Common Stock held indirectly through an IRA

Restricted stock vesting schedule 20% per year Restricted stock vesting annually starting April 24, 2026

Cliff-vesting restricted stock 100% on January 2, 2027 Separate restricted stock grant vesting in full on that date

Key Terms

Form 4, tax-withholding disposition, restricted stock, IRA

4 terms

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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.

IRA financial

"nature_of_ownership": "By IRA""

An individual retirement account (IRA) is a savings account designed to help people put aside money for their retirement, often with tax advantages that encourage long-term savings. It matters to investors because it can grow over time, providing financial security later in life, and offers benefits that can reduce current taxes or allow investments to compound more effectively.

FAQ

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

What insider activity did NB Bancorp (NBBK) report for Darcey William?

NB Bancorp director Darcey William reported a tax-related share disposition and updated holdings. One entry reflects 4,918 shares used to satisfy obligations, and another records 80,000 shares of common stock held indirectly through an IRA, plus remaining direct holdings.

How many NB Bancorp shares were used for tax withholding in this Form 4?

The filing shows 4,918 shares of NB Bancorp common stock were disposed of at $19.82 per share as a tax-withholding transaction. This type of disposition typically covers exercise price or tax liability by delivering securities rather than representing an open-market sale.

What are Darcey William’s direct NB Bancorp share holdings after the transaction?

After the tax-withholding disposition, Darcey William directly holds 77,721 shares of NB Bancorp common stock. This figure reflects his direct ownership only and excludes his separate 80,000-share indirect holding through an IRA reported in the same Form 4.

How many NB Bancorp shares does Darcey William hold indirectly through an IRA?

The Form 4 reports 80,000 NB Bancorp common shares held indirectly by Darcey William through an IRA. This is recorded as a holding entry, meaning it reflects ownership status rather than a new purchase or sale of shares in the market.

What restricted stock awards are disclosed for NB Bancorp director Darcey William?

Footnotes indicate his holdings include restricted stock that vests 20% per year starting April 24, 2026, and another grant vesting 100% on January 2, 2027. These vesting schedules tie a portion of his NB Bancorp equity exposure to future service periods.

Does this NB Bancorp Form 4 show an open-market share sale by Darcey William?

The reported disposition is coded as a tax-withholding transaction, not an open-market sale. Shares were delivered to cover exercise price or tax liability, while Darcey William continues to hold both direct and indirect positions in NB Bancorp common stock.

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

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Accepted by SEC EDGAR 04/27/2026 - 02:51 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^*

Darcey William

(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	77,721(1)(2)	D
Common Stock								80,000	I	By IRA

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)