STOCK TITAN

NB Bancorp (NBBK) director amends Form 4 to fix mistaken stock disposition

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4/A

Rhea-AI Filing Summary

NB Bancorp, Inc. director William Darcey filed an amended Form 4 to correct a prior error. A Form 4 filed on April 27, 2026 had mistakenly reported a sale of common stock that never occurred, and this amendment updates the beneficial ownership records.

Following the correction, Darcey is shown holding 80,000 shares of common stock indirectly through an IRA and 82,639 shares directly. The direct holdings include restricted stock that vests 20% per year starting on April 24, 2026, plus additional restricted shares vesting 100% on January 2, 2027.

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Insider Darcey William
Role Director
Type Security Shares Price Value
holding Common Stock -- -- --
holding Common Stock -- -- --
Holdings After Transaction: Common Stock — 82,639 shares (Direct); Common Stock — 80,000 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 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.
Indirect holdings 80,000 shares Common Stock held indirectly by IRA after amendment
Direct holdings 82,639 shares Common Stock held directly after amendment
Restricted stock vesting rate 20% per year Restricted stock vesting annually starting April 24, 2026
Cliff vesting date January 2, 2027 Restricted stock vests 100% on this date
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.
IRA financial
"total_shares_following_transaction: 80000.0000 ... nature_of_ownership: By IRA"
An individual retirement account (IRA) is a savings account designed to help people put aside money for their retirement, often with tax advantages that encourage long-term savings. It matters to investors because it can grow over time, providing financial security later in life, and offers benefits that can reduce current taxes or allow investments to compound more effectively.
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FAQ

What does William Darcey’s amended Form 4 for NB Bancorp (NBBK) change?

The amended Form 4 removes a previously reported stock disposition that never occurred. It corrects Darcey’s beneficial ownership totals, updating his direct and indirect holdings in NB Bancorp common stock and ensuring the public record accurately reflects his current position.

How many NB Bancorp (NBBK) shares does William Darcey hold after this amended Form 4?

After the amendment, Darcey holds 80,000 NB Bancorp common shares indirectly via an IRA and 82,639 shares directly. These figures include restricted stock that will vest over time according to the schedules disclosed in the filing’s footnotes.

What mistake did the original Form 4 for NB Bancorp (NBBK) report?

The original Form 4 filed on April 27, 2026 mistakenly reported a disposition of NB Bancorp common stock that did not actually occur. The amended filing removes that nonexistent transaction and updates the beneficial ownership amounts accordingly for greater accuracy.

How do William Darcey’s restricted NB Bancorp (NBBK) shares vest?

Some of Darcey’s restricted NB Bancorp shares vest 20% per year beginning April 24, 2026. Additional restricted stock vests 100% on January 2, 2027. These time-based vesting schedules affect when those shares fully belong to him without restrictions.

Does this amended NB Bancorp (NBBK) Form 4 show any new stock purchases or sales?

The amended Form 4 does not show new stock purchases or sales. It primarily corrects a previously reported, but nonexistent, disposition and restates Darcey’s direct and indirect holdings, including restricted stock subject to future vesting dates and schedules.

How are William Darcey’s indirect NB Bancorp (NBBK) holdings structured?

Darcey’s indirect NB Bancorp holdings are reported as 80,000 common shares held through an IRA. This means the shares are owned within an individual retirement account, which can have different tax and ownership considerations than direct personal holdings.
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*
Darcey William

(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
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)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock82,639(1)(2)(3)D
Common Stock80,000IBy IRA
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 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 attorney05/15/2026
** 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)