NB Bancorp (NBBK) director corrects prior insider share filing

Rhea-AI Filing Summary

NB Bancorp, Inc. director Angela Jackson filed an amended insider report to correct a previously reported share disposition that did not actually occur. The filing shows she beneficially owns 81,255 shares of common stock, including restricted stock that vests 20% per year starting April 24, 2026 and additional restricted shares that vest 100% on January 2, 2027.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Jackson Angela

Role null

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

Holdings After Transaction: Common Stock — 81,255 shares (Direct, null)

Footnotes (1)

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 beneficially owned: 81,255 shares Restricted stock vesting schedule 1: 20% per year Restricted stock vesting schedule 2: 100% on January 2, 2027

3 metrics

Shares beneficially owned 81,255 shares Common Stock beneficially owned following reported holdings entry

Restricted stock vesting schedule 1 20% per year Restricted stock vests 20% annually commencing April 24, 2026

Restricted stock vesting schedule 2 100% on January 2, 2027 Restricted stock grant fully vests on January 2, 2027

Key Terms

restricted stock, beneficially owned, vest, disposition of shares

4 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.

vest financial

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

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

disposition of shares financial

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

Form 4 Insider Transactions: What Each Field Means →

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)
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)
			Code	V	Amount	(A) or (D)	Price
Common Stock								81,255(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)
				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.

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)

FAQ

What does Angela Jackson’s amended Form 4/A for NBBK disclose?

The amended Form 4/A corrects a prior error and updates holdings. It states a previously reported disposition of NB Bancorp common stock never occurred and shows Angela Jackson now beneficially owns 81,255 shares, including restricted stock with scheduled vesting in 2026 and 2027.

How many NB Bancorp (NBBK) shares does Angela Jackson own after this filing?

The filing reports beneficial ownership of 81,255 common shares. This total includes both currently vested shares and unvested restricted stock awards that will vest over time, rather than reflecting a recent purchase or sale transaction in the company’s stock.

What correction is made in Angela Jackson’s NB Bancorp Form 4/A?

The amendment removes a disposition that never occurred. It explains a Form 4 filed on April 27, 2026 mistakenly reported a sale of common stock. The amended filing adjusts the beneficial ownership numbers to reflect that no such disposition took place.

How do Angela Jackson’s restricted NB Bancorp (NBBK) shares vest?

The filing describes two restricted stock vesting schedules. Some restricted shares vest 20% per year beginning April 24, 2026, while another grant of restricted stock is scheduled to vest 100% on January 2, 2027, subject to the award terms.

Does Angela Jackson’s Form 4/A for NBBK show any stock sales or purchases?

The filing does not report new purchases or sales. It is characterized as a correction to a mistakenly reported disposition and presents updated beneficial ownership, rather than documenting fresh buy or sell transactions in NB Bancorp stock.