CAMPANELLI JOSEPH P (President & CEO) purchased 0.8% of their position (3K shares) of NB BANCORP, INC. on the open market

Open‑market purchase worth $57.5K — a small addition. The strongest form of insider conviction signal.

P · 9 purchases

CAMPANELLI JOSEPH P

Filed: 5/18/2026ACC: 0001437749-26-017617

InsiderCAMPANELLI JOSEPH PCIK 1222378

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IssuerNB BANCORP, INC.CIK 1979330

DirectorOfficerOther· President & CEO

Since Feb 2026

+3K

Net shares

Net buyer

$57.5K

Total acquired

Open market trades

9B · 0S

Total transactions

3K acquired

Non-Derivative Transactions9

Common Stock

Direct

P · Purchase

+500.00

Price / share

$19.16

Trade value

$9.58K

% of position

0.1%

5/15/2026

374.79K→375.29K

Common Stock

Direct

P · Purchase

+133.00

Price / share

$19.17

Trade value

$2.55K

% of position

0.0%

5/15/2026

375.29K→375.42K

Common Stock

Direct

P · Purchase

+400.00

Price / share

$19.18

Trade value

$7.67K

% of position

0.1%

5/15/2026

375.42K→375.82K

Common Stock

Direct

P · Purchase

+100.00

Price / share

$19.18

Trade value

$1.92K

% of position

0.0%

5/15/2026

375.82K→375.92K

Common Stock

Direct

P · Purchase

+767.00

Price / share

$19.18

Trade value

$14.71K

% of position

0.2%

5/15/2026

375.92K→376.69K

Common Stock

Direct

P · Purchase

+500.00

Price / share

$19.19

Trade value

$9.60K

% of position

0.1%

5/15/2026

376.69K→377.19K

Common Stock

Direct

P · Purchase

+253.00

Price / share

$19.20

Trade value

$4.86K

% of position

0.1%

5/15/2026

377.19K→377.44K

Common Stock

Direct

P · Purchase

+100.00

Price / share

$19.20

Trade value

$1.92K

% of position

0.0%

5/15/2026

377.44K→377.54K

Common Stock

Direct

P · Purchase

+247.00

Price / share

$19.21

Trade value

$4.74K

% of position

0.1%

5/15/2026

377.54K→377.79K

Total

Net shares

+3K

Net value

$57.55K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	5/15/2026	P · Purchase	+500.00	$19.16	$9.58K	0.1%	374.79K	375.29K
Common Stock Direct	5/15/2026	P · Purchase	+133.00	$19.17	$2.55K	0.0%	375.29K	375.42K
Common Stock Direct	5/15/2026	P · Purchase	+400.00	$19.18	$7.67K	0.1%	375.42K	375.82K
Common Stock Direct	5/15/2026	P · Purchase	+100.00	$19.18	$1.92K	0.0%	375.82K	375.92K
Common Stock Direct	5/15/2026	P · Purchase	+767.00	$19.18	$14.71K	0.2%	375.92K	376.69K
Common Stock Direct	5/15/2026	P · Purchase	+500.00	$19.19	$9.60K	0.1%	376.69K	377.19K
Common Stock Direct	5/15/2026	P · Purchase	+253.00	$19.20	$4.86K	0.1%	377.19K	377.44K
Common Stock Direct	5/15/2026	P · Purchase	+100.00	$19.20	$1.92K	0.0%	377.44K	377.54K
Common Stock Direct	5/15/2026	P · Purchase	+247.00	$19.21	$4.74K	0.1%	377.54K	377.79K
Total			+3K		$57.55K

Derivative Transactions0

No derivative transactions reported

Non-Derivative Holdings (Post-Transaction)4

Common Stock

Indirect

Shares owned47K

Common Stock

Indirect

Shares owned50.47K

Common Stock

Indirect

Shares owned3K

Common Stock

Indirect

Shares owned3.68K

Total

104.15K indirect104.15K

Security Title	Shares Owned	Ownership Type
Common Stock	47K	Indirect
Common Stock	50.47K	Indirect
Common Stock	3K	Indirect
Common Stock	3.68K	Indirect
Total	104.15K	104.15K indirect

Derivative Holdings (Post-Transaction)0

No derivative holdings reported