Company · Ownership research

NB Bancorp, Inc. NBBK

CIK 0001979330

Form 4 transactions dated Sep 1, 2023 to Sep 26, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

Insider filings on file run through 2026-08-21.

Insider purchases & sales

Purchased: $4.12M
Sold: $45.86K

Sep 1, 2023 – Aug 21, 2026
Available records · partial months are marked ·

202510 of 15 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
2025-12-19	EVANGELISTA PAUL A EVP, Dir Spec. Bank. Ctr.	Purchase	$41.74K 2,000 shares bought	8.14% added Direct holding	▾
2025-10-28	Pascucci Hope Director	Purchase	$84.70K 4,688 shares bought	4.07% added Direct holding	▾
2025-09-12	Montgomery Kenneth C. Director	Purchase	$92.20K 5,000 shares bought	6.64% added Direct holding	▾
2025-08-11	Darcey William Director	Purchase	$86.50K 5,000 shares bought	6.65% added Direct holding	▾
2025-07-25	EVANGELISTA PAUL A EVP, Dir Spec. Bank. Ctr.	Purchase	$9.20K 500 shares bought	2.08% added Direct holding	▾
2025-06-09	EVANGELISTA PAUL A EVP, Dir Spec. Bank. Ctr.	Purchase	$16.29K 1,000 shares bought	4.34% added Direct holding	▾
2025-06-09	CAMPANELLI JOSEPH P President & CEO · Director · Chairman of the Board	Purchase	$32.38K 2,000 shares bought	0.61% added Direct holding	▾
2025-06-09	CAMPANELLI JOSEPH P President & CEO · Director · Chairman of the Board	Purchase	$81.45K 5,000 shares bought	12.50% added Indirect holding	▾
2025-05-02	Elliott Mary Susan Director	Purchase	$30.67K 1,434 shares bought	New holding Indirect holding	▾
2025-04-29	Orfanello Francis Director	Purchase	$85.45K 5,000 shares bought	3.99% added Direct holding	▾

Showing 15 / 15 record groups in 2025. The complete set is available through the API.

NB Bancorp, Inc. · NBBK

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The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. For the year shown, this page lists 15 of 15 purchase / sale groups and 20 of 20 other groups; the totals and the monthly series cover the whole window.

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{"ticker":"NBBK","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}

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Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.

Non-cancelled, non-derivative purchase (P) and sale (S) rows dated inside the public window, as reported. Includes open-market and private transactions. Data after the latest filing is not asserted complete and is not zero-filled. A grouped event shares filing, transaction date, security, code, direction, ownership bucket and source. Derivative groups also match underlying security, exercise price, exercise/expiration dates and footnote references. Reported rows are retained; P/S price lots can be grouped. Post-transaction balances are never summed.