NB Bancorp director reports stock purchases

NB Bancorp, Inc. director Mary Susan Elliott reported open-market purchases of the company’s common stock.

Rhea-AI Filing Summary

NB Bancorp, Inc. director Mary Susan Elliott reported open-market purchases of the company’s common stock. On January 24, 2025, she bought 10,000 shares at $18.72 each, bringing her directly held position to 115,761 shares, including restricted stock that vests 20% annually starting April 24, 2026 and a grant vesting 100% on January 2, 2027. On May 2, 2025, an additional 1,434 shares were acquired at $21.39 per share and are held indirectly through her spouse.

Insider Trade Summary

Net Buyer: 11,434 shares

Net Buy 2 txns

Insider Elliott Mary Susan

Role Director

Bought 11,434 shs ($218K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	1,434	$21.39	$31K
Purchase	Common Stock	10,000	$18.72	$187K

Holdings After Transaction: Common Stock — 115,761 shares (Direct); Common Stock — 1,434 shares (Indirect, By Spouse)

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.

FAQ

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

What insider transactions did NB Bancorp (NBBK) report for Mary Susan Elliott?

NB Bancorp director Mary Susan Elliott reported buying 10,000 common shares at $18.72 and an additional 1,434 shares were acquired indirectly through her spouse at $21.39. These open-market purchases increase both her direct and indirect beneficial ownership.

How many NB Bancorp (NBBK) shares does Mary Susan Elliott own after these trades?

After the January 24, 2025 purchase, Mary Susan Elliott beneficially owns 115,761 common shares directly, including restricted stock awards. Following the May 2, 2025 trade, her spouse holds 1,434 shares indirectly attributed to her, expanding her overall reported beneficial ownership.

At what prices did NB Bancorp (NBBK) shares trade in these insider purchases?

The director’s January 24, 2025 open-market purchase was at $18.72 per NB Bancorp common share. The May 2, 2025 acquisition, held indirectly through her spouse, was executed at $21.39 per share, reflecting two distinct transaction prices in the reported activity.

How are Mary Susan Elliott’s indirect NB Bancorp (NBBK) holdings structured?

The Form 4 shows 1,434 NB Bancorp common shares held indirectly, noted as “By Spouse.” These shares are attributed to Mary Susan Elliott for reporting purposes, but the ownership line distinguishes them from her directly held common stock position.

What restricted stock awards are included in Mary Susan Elliott’s NB Bancorp holdings?

Her 115,761 directly held NB Bancorp shares include restricted stock. One grant vests 20% per year starting April 24, 2026, and another vests 100% on January 2, 2027, affecting when she fully gains unrestricted access to those particular shares.

What role does Mary Susan Elliott hold at NB Bancorp (NBBK)?

Mary Susan Elliott is identified as a director of NB Bancorp, Inc. Her role is disclosed in connection with the reported open-market purchases of the company’s common stock and the indirect holdings attributed through her spouse.

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

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Accepted by SEC EDGAR 01/30/2026 - 11:02 AM EST 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^*

Elliott Mary Susan

(Last) (First) (Middle)

1063 GREAT PLAIN AVE

(Street)

NEEDHAM MA 02492

(City) (State) (Zip)

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)

3. Date of Earliest Transaction (Month/Day/Year)
01/24/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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	01/24/2025		P		10,000	A	$18.72	115,761(1)(2)	D
Common Stock	05/02/2025		P		1,434	A	$21.39	1,434	I	By Spouse

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	01/30/2026
	** 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.