NB Bancorp (NBBK) director amends Form 4 to correct reported share holdings

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

4/A

Rhea-AI Filing Summary

NB Bancorp, Inc. director Joseph R. Nolan Jr. filed an amended Form 4 to correct a previously reported disposition of common stock that the footnotes state did not occur. The amendment shows he directly holds 87,739 shares of common stock.

This holding includes restricted stock that vests at a rate of 20% per year commencing on April 24, 2026, and additional restricted shares that vest 100% on January 2, 2027. The filing updates his beneficial ownership without recording a new purchase or sale.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider NOLAN JOSEPH R JR

Role null

Type	Security	Shares	Price	Value
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 87,739 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. On April 27, 2026, a Form 4 was mistakenly filed reporting a disposition of shares of common stock that did not in fact occur. The change in the securities beneficially owned has been corrected accordingly in this amended Form 4.

Key Figures

Shares held after amendment: 87,739 shares Restricted stock annual vesting rate: 20% per year Annual vesting start date: April 24, 2026 +2 more

5 metrics

Shares held after amendment 87,739 shares Common stock directly held following corrected Form 4

Restricted stock annual vesting rate 20% per year Restricted stock vesting commencing April 24, 2026

Annual vesting start date April 24, 2026 Start of 20% per year restricted stock vesting

Cliff vesting percentage 100% Restricted stock vesting in full on January 2, 2027

Cliff vesting date January 2, 2027 Date when certain restricted shares fully vest

Key Terms

restricted stock, beneficially owned, Form 4, disposition, +1 more

5 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.

beneficially owned financial

"The change in the securities beneficially owned has been corrected accordingly"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Form 4 financial

"On April 27, 2026, a Form 4 was mistakenly filed reporting a disposition"

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.

disposition financial

"reporting a disposition of shares of common stock that did not in fact occur"

common stock financial

"reporting a disposition of shares of common stock that did not in fact occur"

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.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 05/15/2026 - 11:12 AM Accepted by SEC EDGAR 05/15/2026 - 11:12 AM

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)
04/27/2026

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								87,739⁽¹⁾⁽²⁾⁽³⁾	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.

3. On April 27, 2026, a Form 4 was mistakenly filed reporting a disposition of shares of common stock that did not in fact occur. The change in the securities beneficially owned has been corrected accordingly in this amended Form 4.

	/s/ Steven T. Lanter, pursuant to power of attorney	05/15/2026
	** 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 does NB Bancorp (NBBK) director Joseph R. Nolan Jr.'s amended Form 4 report?

The amended Form 4 updates Joseph R. Nolan Jr.’s reported holdings to 87,739 NB Bancorp common shares. It corrects a previously reported disposition that the filing states did not occur, aligning his beneficial ownership records with his actual position.

Did NB Bancorp (NBBK) director Joseph R. Nolan Jr. buy or sell shares in this Form 4/A?

The Form 4/A does not show a new purchase or sale of NB Bancorp shares. It instead corrects an earlier Form 4 that mistakenly reported a disposition, and confirms his current direct holdings and restricted stock vesting schedule.

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

After the amendment, Joseph R. Nolan Jr. is reported to directly hold 87,739 NB Bancorp common shares. This figure includes restricted stock awards that will vest over time, as detailed in the filing’s footnotes.

What restricted stock vesting schedule is disclosed for NB Bancorp (NBBK) director Nolan?

The filing notes restricted stock that vests 20% per year starting April 24, 2026. It also includes awards that vest 100% on January 2, 2027, outlining when portions of his equity compensation become fully owned.

Why was NB Bancorp (NBBK) director Nolan’s original Form 4 corrected?

The amendment explains that a prior Form 4 filed on April 27, 2026 mistakenly reported a share disposition. That transaction did not actually occur, so this Form 4/A corrects the reported change in securities beneficially owned.