What SEC filings does NB Bancorp, Inc. submit to the SEC?

NB Bancorp, Inc. (NBBK) submits several types of SEC filings including Form 4 (insider transactions), Form 144 (proposed insider sales), 8-K reports (material events such as earnings releases, acquisitions, leadership changes), and periodic reports — the 10-Q (quarterly) and 10-K (annual). All filings are publicly available through SEC EDGAR.

What does a Form 4 filing tell me about NBBK?

A Form 4 for NBBK discloses a transaction by a company insider — typically a director, officer, or 10%+ shareholder. It shows the source-reported date, number of shares, price, and updated ownership. These facts do not establish motive or predict future returns.

How do I interpret an 8-K filing from NB Bancorp, Inc.?

An 8-K signals a material event requiring prompt disclosure. Common triggers include earnings pre-announcements, acquisitions, leadership appointments or departures, credit changes, or regulatory actions. Read the item codes inside the filing to understand exactly what was disclosed before drawing conclusions.

What is the difference between a 10-K and 10-Q for NBBK?

The 10-K is NB Bancorp, Inc.'s annual report with fully audited financial statements, comprehensive MD&A, and complete risk factor disclosures — filed 60–90 days after fiscal year-end. The 10-Q is a lighter quarterly report with unaudited financials filed for the first three quarters. Together they provide a continuous financial picture of the company.

Where can I see all NBBK SEC filings directly on EDGAR?

You can view all historical NB Bancorp, Inc. filings on the SEC EDGAR company page for NBBK. Each filing card on this page links directly to the original SEC document.

How often does NB Bancorp, Inc. file with the SEC?

NB Bancorp, Inc. files one 10-K per year and up to three 10-Qs per year. Form 4 insider transactions must be reported within two business days of each trade, so the frequency depends on how often insiders are buying or selling NBBK shares. 8-K filings occur whenever a material event happens — which can be several times per quarter for an active company.

NBBK SEC Filing News — NB Bancorp, Inc.

Latest SEC filings for NB Bancorp, Inc. (NBBK) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-10-15.

NB Bancorp, Inc. focuses on operating as a bank holding company for Needham Bank that provides various banking products and services in the Greater Boston metropolitan area and surrounding communities in the United States. The company offers various deposits, including certificate of deposit, individual retirement, money market, savings, NOW, demand deposit, and interest-bearing and noninterest-bearing checking accounts; and commercial real estate and multifamily residential loans, one- to four-…

Sector: Financial Services Industry: Banks - Regional Market Cap: $957.9M CIK: 1979330

Total Filings

Bullish Classifications

Bearish Classifications

Insider Transactions

Material Events (8-K)

Periodic Reports

Rule-based classifications for NBBK currently lean bullish. Of the 20 displayed SEC filing records, 5 carry bullish classifications versus 1 bearish classifications. These labels summarize filing attributes; they are not recommendations, probabilities, or evidence of future price direction. There were 13 insider transactions (Form 4) in this period.

NBBK Filing Activity Snapshot 2026-04-24 — 2026-10-15

Insider Transactions (Form 4)

5 buys vs 1 sell

Net insider buying in this period — more purchases than sales reported.

Largest Form 144 Filing

$389.3K

Pascucci Hope (Director) · 2026-04-24

20,000 shares · Form 4

Insider Transactions 13 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 13 filings in this group are Form 4s for NB Bancorp, Inc.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 13 insider filings shown, the breakdown is 7 tax withholding, 5 open-market purchase and 1 open-market sale. 6 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Tax withholding ×7: Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.
Open-market purchase ×5: The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.
Open-market sale ×1: The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Form 4 Open-market purchase Insider Buying 2026-08-21

NBBK insider CAMPANELLI JOSEPH P (Director, President & CEO) bought 2,000 shares (~$43.5K)

CAMPANELLI JOSEPH P, listed as Director, President & CEO at NB Bancorp, Inc., reported an open-market purchase of 2,000 NBBK shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`P`	Open-market purchase	2,000	$21.75	$43.5K

Filing: Form 4 (Insider Transaction) Insider: CAMPANELLI JOSEPH P (Director, President & CEO) Shares: 2,000 Est. Value: $43.5K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market purchase Insider Buying 2026-08-21

NBBK insider Lapointe Jean-Pierre (SEVP and CFO) bought 200 shares (~$4.4K)

Lapointe Jean-Pierre, listed as SEVP and CFO at NB Bancorp, Inc., reported an open-market purchase of 200 NBBK shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`P`	Open-market purchase	200	$21.80	$4.4K

Filing: Form 4 (Insider Transaction) Insider: Lapointe Jean-Pierre (SEVP and CFO) Shares: 200 Est. Value: $4.4K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-08-18

NBBK insider Henkin Kevin (EVP, Chief Credit Officer) sold 2,000 shares (~$45.9K)

Henkin Kevin, listed as EVP, Chief Credit Officer at NB Bancorp, Inc., reported an open-market sale of 2,000 NBBK shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`S`	Open-market sale	2,000	$22.93	$45.9K

Filing: Form 4 (Insider Transaction) Insider: Henkin Kevin (EVP, Chief Credit Officer) Shares: 2,000 Est. Value: $45.9K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market purchase Insider Buying 2026-05-18

NBBK insider CAMPANELLI JOSEPH P (Director, President & CEO) bought 3,000 shares (~$57.5K)

CAMPANELLI JOSEPH P, listed as Director, President & CEO at NB Bancorp, Inc., reported an open-market purchase of 3,000 NBBK shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`P`	Open-market purchase	500	$19.16	$9.6K
`P`	Open-market purchase	133	$19.17	$2.5K
`P`	Open-market purchase	400	$19.18	$7.7K
`P`	Open-market purchase	100	$19.18	$1.9K
`P`	Open-market purchase	767	$19.18	$14.7K
`P`	Open-market purchase	500	$19.19	$9.6K
`P`	Open-market purchase	253	$19.20	$4.9K
`P`	Open-market purchase	100	$19.20	$1.9K
`P`	Open-market purchase	247	$19.21	$4.7K

Filing: Form 4 (Insider Transaction) Insider: CAMPANELLI JOSEPH P (Director, President & CEO) Shares: 3,000 Est. Value: $57.5K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market purchase Insider Buying 2026-04-27

NBBK insider CAMPANELLI JOSEPH P (Director, President & CEO) bought 2,500 shares (~$48.6K)

CAMPANELLI JOSEPH P, listed as Director, President & CEO at NB Bancorp, Inc., reported an open-market purchase of 2,500 NBBK shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	24,371	$19.82	$483.0K
`P`	Open-market purchase	320	$19.33	$6.2K
`P`	Open-market purchase	180	$19.34	$3.5K
`P`	Open-market purchase	500	$19.37	$9.7K
`P`	Open-market purchase	722	$19.45	$14.0K
`P`	Open-market purchase	178	$19.46	$3.5K
`P`	Open-market purchase	100	$19.47	$1.9K
`P`	Open-market purchase	500	$19.62	$9.8K

Filing: Form 4 (Insider Transaction) Insider: CAMPANELLI JOSEPH P (Director, President & CEO) Shares: 2,500 Est. Value: $48.6K

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-04-27

NBBK insider Form 4 filed for equity award, exercise, or tax withholding

Darcey William (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	4,918	$19.82	$97.5K

Filing: Form 4 (Insider Transaction) Insider: Darcey William (Director) Shares: 4,918

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-04-27

NBBK insider Form 4 filed for equity award, exercise, or tax withholding

Jackson Angela (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	4,918	$19.82	$97.5K

Filing: Form 4 (Insider Transaction) Insider: Jackson Angela (Director) Shares: 4,918

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-04-27

NBBK insider Form 4 filed for equity award, exercise, or tax withholding

Whalen Mark (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	4,918	$19.82	$97.5K

Filing: Form 4 (Insider Transaction) Insider: Whalen Mark (Director) Shares: 4,918

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-04-27

NBBK insider Form 4 filed for equity award, exercise, or tax withholding

NOLAN JOSEPH R JR (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	4,918	$19.82	$97.5K

Filing: Form 4 (Insider Transaction) Insider: NOLAN JOSEPH R JR (Director) Shares: 4,918

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-04-27

NBBK insider Form 4 filed for equity award, exercise, or tax withholding

Montgomery Kenneth C. (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	5,015	$19.82	$99.4K

Filing: Form 4 (Insider Transaction) Insider: Montgomery Kenneth C. (Director) Shares: 5,015

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-04-27

NBBK insider Form 4 filed for equity award, exercise, or tax withholding

Lynch Christopher R. (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	4,150	$19.82	$82.3K

Filing: Form 4 (Insider Transaction) Insider: Lynch Christopher R. (Director) Shares: 4,150

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-04-27

NBBK insider Form 4 filed for equity award, exercise, or tax withholding

Roberts Christine (SEVP and COO) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	3,589	$19.82	$71.1K

Filing: Form 4 (Insider Transaction) Insider: Roberts Christine (SEVP and COO) Shares: 3,589

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market purchase Insider Buying 2026-04-24

NBBK insider Pascucci Hope (Director) bought 20,000 shares (~$389.3K)

Pascucci Hope, listed as Director at NB Bancorp, Inc., reported an open-market purchase of 20,000 NBBK shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`P`	Open-market purchase	10,000	$19.44	$194.4K
`P`	Open-market purchase	10,000	$19.49	$194.9K

Filing: Form 4 (Insider Transaction) Insider: Pascucci Hope (Director) Shares: 20,000 Est. Value: $389.3K

View on SEC EDGAR → Open Filing Document →

Material Events 5 · Form 8-K

An 8-K reports a material event in the window between scheduled reports. There are 5 in this period for NB Bancorp, Inc. Each 8-K names the item number it is filed under, and that number is the fastest way to tell a routine disclosure from a consequential one.

Item 2.02 is an earnings release, Item 5.02 is a change of directors or officers, and Item 1.01 or 2.01 covers a material agreement or a completed acquisition. Item 7.01 and Item 8.01 are the general-purpose disclosure items and carry no fixed meaning on their own.

Form 8-K Material Company Update 2026-10-15

NBBK filed 8-K — material company event

NB Bancorp, Inc. filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-07-22

NBBK filed 8-K — material company event

NB Bancorp, Inc. filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-05-21

NBBK filed 8-K — material company event

NB Bancorp, Inc. filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-05-13

NBBK filed 8-K — material company event

NB Bancorp, Inc. filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-04-29

NBBK filed 8-K — material company event

NB Bancorp, Inc. filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Periodic Reports 2 · Forms 10-K and 10-Q

The periodic reports are where the audited and reviewed financial statements live. This period contains 2 quarterly reports (10-Q) for NB Bancorp, Inc.

The two are not equivalent in weight. A 10-K is audited by an external firm and includes the full risk factor disclosure, business description and management discussion; a 10-Q is unaudited, reviewed rather than examined, and much shorter. When a figure in a quarterly report is later revised, the annual report is usually where the correction appears.

An amended report — 10-K/A or 10-Q/A — restates or corrects something in the original filing, and is worth reading against the version it replaces.

Form 10-Q Quarterly Report 2026-08-07

NBBK filed Quarterly Report (10-Q)

NB Bancorp, Inc. filed its quarterly report with the SEC. This report includes unaudited financial statements and management discussion for the quarter.

Filing: 10-Q (Quarterly Report)

View on SEC EDGAR → Open Filing Document →

Form 10-Q Quarterly Report 2026-05-08

NBBK filed Quarterly Report (10-Q)

NB Bancorp, Inc. filed its quarterly report with the SEC. This report includes unaudited financial statements and management discussion for the quarter.

Filing: 10-Q (Quarterly Report)

View on SEC EDGAR → Open Filing Document →

How we classify NB Bancorp, Inc.'s filings

Straight from EDGAR

Each displayed record links to an original source document. StrongBuyAnalytics provides navigation and brief excerpts or summaries, not the filing itself. Parsing may omit context or contain errors, so read the original document in full.

Transaction codes, not guesswork

The nature shown on each insider filing comes from the transaction code the filer entered on the form itself — P for an open-market purchase, A for a compensation award, F for shares withheld to pay tax, M for an option exercise. Where one filing contains several codes, the transaction table lists them line by line.

Why the distinction matters

Insider activity is routinely summarised as buying or selling, which flattens together decisions that mean very different things. Shares withheld for tax on a vesting grant are an automatic administrative step; shares bought on the open market are someone committing their own money at the current price.

What this page does not tell you

A filing records what happened, not why. Form 4 does not always disclose whether a sale was executed under a pre-arranged Rule 10b5-1 plan, and no single filing is a basis for a decision on NBBK. Read these alongside the fundamentals rather than in isolation.

Frequently Asked Questions — NBBK SEC Filings

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NBBK Full Analysis

Publisher, sources & limitations — September 15, 2026. StrongBuyAnalytics provides navigation and brief excerpts or summaries for educational use. Original filings remain at SEC EDGAR or other displayed source links; StrongBuyAnalytics does not author them. Filing dates are source dates, not publication dates for this page. Coverage can be delayed, incomplete, amended, or unavailable because of SEC/source availability, parsing, caching, or outages. Verify every material statement in the original filing.

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