NB Bancorp (NBBK) director uses 4,918 shares to cover tax liability

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

NB Bancorp, Inc. director Joseph R. Nolan Jr. reported a tax-related share disposition. On April 24, 2026, he transferred 4,918 shares of common stock at $19.82 per share to cover tax obligations by delivering shares, rather than selling them on the open market.

After this tax-withholding disposition, he directly holds 82,821 shares of NB Bancorp common stock. These holdings include restricted stock that is scheduled to vest 20% per year starting on April 24, 2026, and additional restricted shares that vest 100% on January 2, 2027.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider NOLAN JOSEPH R JR

Role null

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	4,918	$19.82	$97K

Holdings After Transaction: Common Stock — 82,821 shares (Direct, null)

Footnotes (1)

Includes shares of restricted stock which vest at a rate of 20% per year commencing on April 24, 2026. Includes shares of restricted stock which vest 100% on January 2, 2027.

Key Figures

Tax-withholding shares: 4,918 shares Price per share: $19.82 per share Shares held after transaction: 82,821 shares +2 more

5 metrics

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

Price per share $19.82 per share Value used for tax-withholding disposition

Shares held after transaction 82,821 shares Direct NB Bancorp common stock holdings following disposition

Restricted stock vesting start 20% per year Restricted shares vesting rate starting April 24, 2026

Cliff vesting date January 2, 2027 Restricted stock vesting 100% on this date

Key Terms

tax-withholding disposition, restricted stock, vest 100%, Common Stock, +1 more

5 terms

tax-withholding disposition financial

"Payment of exercise price or tax liability by delivering securities"

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.

vest 100% financial

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

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.

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.

Form 4 Insider Transactions: What Each Field Means →

04/27/2026 - 02:49 PM

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^*

NOLAN JOSEPH R JR

(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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	04/24/2026		F		4,918	D	$19.82	82,821⁽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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did NB Bancorp (NBBK) report for Joseph R. Nolan Jr.?

NB Bancorp director Joseph R. Nolan Jr. reported a tax-withholding disposition of 4,918 common shares. The shares were delivered at $19.82 per share to satisfy tax obligations, rather than sold in an open-market transaction, and he retained a substantial remaining stake.

How many NB Bancorp (NBBK) shares does Joseph R. Nolan Jr. hold after this filing?

After the tax-withholding disposition, Joseph R. Nolan Jr. directly holds 82,821 NB Bancorp common shares. This total includes restricted stock awards scheduled to vest over time, providing continuing equity exposure linked to future vesting dates in 2026 and 2027.

What does a tax-withholding disposition mean in the NB Bancorp (NBBK) Form 4?

A tax-withholding disposition means shares are delivered back to the company to cover tax liabilities on equity awards. For NB Bancorp, 4,918 shares were transferred at $19.82 per share, so this event reflects tax payment mechanics rather than an open-market share sale.

On what date did the reported NB Bancorp (NBBK) insider transaction occur?

The reported transaction occurred on April 24, 2026. On that date, 4,918 NB Bancorp common shares were used to satisfy tax obligations. This timing also aligns with restricted stock that begins vesting 20% per year starting on the same April 24, 2026.

How do NB Bancorp (NBBK) restricted stock awards for Joseph R. Nolan Jr. vest?

Some of Joseph R. Nolan Jr.’s NB Bancorp restricted shares vest 20% per year starting on April 24, 2026. Additional restricted stock vests 100% on January 2, 2027, creating a schedule of future equity becoming fully owned over those dates.

Is the NB Bancorp (NBBK) insider event an open-market sale of shares?

No, the event is characterized as a tax-withholding disposition, not an open-market sale. 4,918 shares were delivered to cover tax liabilities at $19.82 per share, while Joseph R. Nolan Jr. continues to hold 82,821 NB Bancorp common shares directly.