STOCK TITAN

NB Bancorp (NBBK) CEO adds shares with 2,500-share open-market buy

Filing Impact
(Very High)
Filing Sentiment
(Positive)
Form Type
4

Rhea-AI Filing Summary

NB Bancorp, Inc. President & CEO Joseph P. Campanelli reported multiple open‑market purchases of Common Stock on April 24, 2026, totaling 2,500 shares at prices between $19.33 and $19.63 per share.

Following these trades and a 24,371‑share tax‑withholding disposition, he directly held 372,290 shares, in addition to indirect holdings through an ESOP, 401(k), trust, and IRA.

Positive

  • None.

Negative

  • None.
Insider CAMPANELLI JOSEPH P
Role President & CEO
Bought 2,500 shs ($49K)
Type Security Shares Price Value
Tax Withholding Common Stock 24,371 $19.82 $483K
Purchase Common Stock 320 $19.33 $6K
Purchase Common Stock 180 $19.34 $3K
Purchase Common Stock 500 $19.37 $10K
Purchase Common Stock 722 $19.45 $14K
Purchase Common Stock 178 $19.46 $3K
Purchase Common Stock 100 $19.47 $2K
Purchase Common Stock 500 $19.625 $10K
holding Common Stock -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
Holdings After Transaction: Common Stock — 372,290 shares (Direct, null); Common Stock — 47,000 shares (Indirect, By IRA)
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 at a rate of 33 1/3% per year commencing on February 25, 2027. Reflects transactions not required to be reported pursuant to Section 16 of the Securities Act of 1934, as amended.
Open-market purchases 2,500 shares Common Stock bought on April 24, 2026
Purchase price range $19.33–$19.63 per share Open-market buys on April 24, 2026
Tax-withholding shares 24,371 shares at $19.82 Code F tax-withholding disposition
Direct holdings after transactions 372,290 shares Common Stock directly owned after April 24, 2026
ESOP indirect holdings 3,677 shares Held indirectly by ESOP
401(k) indirect holdings 50,470 shares Held indirectly by 401(k)
Trust indirect holdings 3,000 shares Held as trustee for trust
IRA indirect holdings 47,000 shares Held indirectly by IRA
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.
ESOP financial
"total_shares_following_transaction 3677.0000, nature_of_ownership By ESOP"
An Employee Stock Ownership Plan (ESOP) is a program that gives employees ownership shares in their company, often as part of their benefits package. It acts like a company-sponsored savings plan, allowing workers to have a stake in the company's success, which can boost motivation and loyalty. For investors, ESOPs can influence company decisions and stock value, making them an important aspect of corporate ownership and governance.
401(k) financial
"total_shares_following_transaction 50470.0000, nature_of_ownership By 401(k)"
A 401(k) is a type of retirement savings plan offered by employers that allows workers to set aside a portion of their paycheck before taxes are taken out. The money saved in a 401(k) can grow over time through investments, helping individuals build funds for their future retirement. It matters to investors because it provides a tax-advantaged way to save and invest for long-term financial security.
tax-withholding disposition financial
"transaction_action tax-withholding disposition for 24,371 shares"
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.
Section 16 regulatory
"Reflects transactions not required to be reported pursuant to Section 16"
Section 16 is a U.S. securities law rule that governs the trading and disclosure obligations of company insiders — typically officers, directors and large shareholders — to promote transparency and deter unfair profit-taking. It requires insiders to publicly report their stock trades and allows companies or the issuer to reclaim quick, short-term profits from certain insider trades, like a scoreboard and a refund policy that help investors see and limit possible insider advantage.
SEC Form 4
FORM 4UNITED 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*
CAMPANELLI JOSEPH P

(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)
XDirector10% Owner
XOfficer (give title below)XOther (specify below)
President & CEOChairman of the Board
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
04/24/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock04/24/2026F24,371D$19.82372,290(1)(2)D
Common Stock04/24/2026P320A$19.33372,610(1)(2)D
Common Stock04/24/2026P180A$19.34372,790(1)(2)D
Common Stock04/24/2026P500A$19.37373,290(1)(2)D
Common Stock04/24/2026P722A$19.45374,012(1)(2)D
Common Stock04/24/2026P178A$19.46374,190(1)(2)D
Common Stock04/24/2026P100A$19.47374,290(1)(2)D
Common Stock04/24/2026P500A$19.625374,790(1)(2)D
Common Stock47,000IBy IRA
Common Stock3,000IAs trustee for trust
Common Stock50,470(3)IBy 401(k)
Common Stock3,677IBy ESOP
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount 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 at a rate of 33 1/3% per year commencing on February 25, 2027.
3. Reflects transactions not required to be reported pursuant to Section 16 of the Securities Act of 1934, as amended.
/s/ Steven Lanter, pursuant to power of attorney04/27/2026
** Signature of Reporting PersonDate
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 insider activity did NBBK’s CEO report on April 24, 2026?

NB Bancorp CEO Joseph P. Campanelli reported buying 2,500 shares of Common Stock on April 24, 2026. The purchases were open‑market trades at prices between $19.33 and $19.63 per share, increasing his direct ownership position in the company.

At what prices did the NBBK CEO buy NB Bancorp shares?

The CEO’s open‑market purchases occurred at prices from $19.33 to $19.63 per share. Individual trades included 500, 100, 178, 722, 500, 180, and 320 shares, each at slightly different prices within this range, all on April 24, 2026.

How many NB Bancorp shares does the CEO directly own after these transactions?

After the reported trades and tax‑withholding disposition, the CEO directly owns 372,290 shares of NB Bancorp Common Stock. This figure reflects his direct holdings only and excludes additional indirect holdings through retirement plans and a trust structure.

What was the tax-withholding transaction reported by the NBBK CEO?

The filing shows a tax‑withholding disposition of 24,371 shares at $19.82 per share, coded “F.” This represents shares delivered to cover tax obligations, not an open‑market sale, and reduced his direct holdings to 372,290 shares after the transaction.

What indirect NB Bancorp holdings does the CEO report in this Form 4?

Indirect holdings include 3,677 shares through an ESOP, 50,470 shares via a 401(k), 3,000 shares as trustee for a trust, and 47,000 shares in an IRA. These positions supplement his direct stake in NB Bancorp Common Stock.

Does the NBBK Form 4 include any restricted stock for the CEO?

Footnotes indicate the CEO’s holdings include restricted stock that vests over time. Some shares vest 20% annually beginning April 24, 2026, and others vest 33 1/3% annually beginning February 25, 2027, adding a time‑based compensation component to his ownership.