Latest Period
Q2 2026
Security Snapshot
NB Bancorp, Inc. - Common Stock, par value $0.01 per share (NBBK) Institutional Ownership
CUSIP: 63945M107
13F Institutional Holders and Ownership History from Q4 2023 to Q2 2026
Institutions Reporting
159
Shares (Excl. Options)
22,453,862
Price
$21.13
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- Security type / class
- Equity / Common Stock, par value $0.01 per share
- Symbol
- NBBK on Nasdaq
- All holders as of 30 Jun 2026
- Q2 2026
- Total 13F shares
- 22,453,862
- Total 13F value
- $474,527,515
- Portfolio coverage rank
- 0%
- Share change
- -601,665
- Value change
- -$12,640,813
- Number of holders
- 159
- Shares outstanding
- 44,556,826
- SEC-reported price per share
- $21.13
- Insider filing price
- $21.13
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- NBBK - NB Bancorp, Inc. - Common Stock, par value $0.01 per share is tracked under CUSIP 63945M107.
- 159 institutions reported positions in Q2 2026.
- 3 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 177 to 159 between Q1 2026 and Q2 2026.
- SEC-reported value moved from $486,313,700 to $474,527,515.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 159 institutions filings for Q2 2026.
Security key
63945M107
Latest holder period
Q2 2026
13F holders
159
13D/G owners
3
CIK / CUSIP context first
Open Q2 2026 holders
NBBK full holder history
NB Bancorp, Inc. SEC filings
NB Bancorp, Inc. company facts
NB Bancorp, Inc. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 63945M107:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
3
Security
NBBK
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Needham Bank Employee Stock Ownership Plan Trust | 7.5% | $67,543,375 | 3,416,458 | Needham Bank Employee Stock Ownership Plan Trust | 31 Dec 2025 | |||
| BlackRock, Inc. | 6.7% | $47,015,321 | 2,663,833 | BlackRock, Inc. | 30 Sep 2025 | |||
| Pertento Partners LLP | 4.6% | -10% | $43,185,367 | -$6,097,089 | 2,049,614 | -12% | Pertento Partners LLP | 31 Mar 2026 |
As of 30 Jun 2026, 159 institutional investors reported holding 22,453,862 shares of NB Bancorp, Inc. - Common Stock, par value $0.01 per share (NBBK). This represents 50% of the company’s total 44,556,826 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
40%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 7.5% | 3,331,544 | +8% | 0% | $70,395,517 |
| VANGUARD CAPITAL MANAGEMENT LLC | 3.7% | 1,670,835 | -1.9% | 0% | $35,304,744 |
| AltraVue Capital, LLC | 3.7% | 1,655,108 | +27% | 2.5% | $34,972,432 |
| Pertento Partners LLP | 3.3% | 1,475,770 | -33% | 2.2% | $31,183,020 |
| STATE STREET CORP | 3.3% | 1,471,766 | +14% | 0% | $31,098,416 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.6% | 1,153,217 | +4.9% | 0% | $24,372,586 |
| DIMENSIONAL FUND ADVISORS LP | 1.7% | 753,320 | +44% | 0% | $15,917,840 |
| GOLDMAN SACHS GROUP INC | 1.3% | 571,954 | -17% | 0% | $12,085,390 |
| Tieton Capital Management, LLC | 1.2% | 546,600 | -1.3% | 3.3% | $11,550,000 |
| HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC | 1.1% | 501,172 | +11% | 0.03% | $10,589,764 |
| Nuveen, LLC | 1.1% | 498,869 | +2.2% | 0% | $10,541,102 |
| FMR LLC | 1.1% | 497,305 | +14% | 0% | $10,508,060 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 0.89% | 397,046 | +2.8% | 0% | $8,389,582 |
| Legato Capital Management LLC | 0.82% | 366,090 | +33% | 0.64% | $7,735,482 |
| NORTHERN TRUST CORP | 0.81% | 360,492 | +7.5% | 0% | $7,617,196 |
| NEW YORK STATE COMMON RETIREMENT FUND | 0.78% | 346,155 | +33% | 0.01% | $7,314,255 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 0.72% | 318,612 | +0.08% | 0% | $6,732,272 |
| CITADEL ADVISORS LLC | 0.65% | 289,814 | +149% | 0% | $6,123,769 |
| TWO SIGMA INVESTMENTS, LP | 0.62% | 277,027 | -25% | 0% | $5,853,581 |
| AMERICAN CENTURY COMPANIES INC | 0.59% | 261,866 | -0.68% | 0% | $5,533,229 |
| VANGUARD FIDUCIARY TRUST CO | 0.57% | 253,951 | -0.03% | 0% | $5,365,985 |
| MORGAN STANLEY | 0.51% | 229,194 | -18% | 0% | $4,842,871 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 0.5% | 221,399 | +6.2% | 0.08% | $4,678,161 |
| Empowered Funds, LLC | 0.41% | 181,399 | +7.7% | 0.02% | $3,832,961 |
| HENNESSY ADVISORS INC | 0.4% | 178,000 | -1.1% | 0.12% | $3,761,140 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
11
Latest
Q2 2026
Rows shown
1-11 of 11
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q2 | 22,453,862 | $474,527,515 | -$12,640,813 | $21.13 | 159 |
| 2026 Q1 | 23,086,599 | $486,313,700 | +$16,942,572 | $21.07 | 177 |
| 2025 Q4 | 22,272,633 | $441,285,654 | +$62,746,915 | $19.82 | 163 |
| 2025 Q3 | 19,191,470 | $338,803,226 | +$8,507,888 | $17.65 | 144 |
| 2025 Q2 | 18,717,578 | $334,367,604 | +$6,692,709 | $17.86 | 129 |
| 2025 Q1 | 18,345,847 | $331,321,498 | +$4,235,296 | $18.07 | 120 |
| 2024 Q4 | 18,099,643 | $326,677,743 | -$12,909,221 | $18.06 | 113 |
| 2024 Q3 | 18,798,787 | $348,790,411 | +$34,867,490 | $18.56 | 106 |
| 2024 Q2 | 16,756,519 | $253,194,867 | +$107,038,595 | $15.08 | 91 |
| 2024 Q1 | 9,585,291 | $131,014,856 | +$95,658,320 | $13.66 | 55 |
| 2023 Q4 | 2,575,613 | $34,675,619 | +$30,437,121 | $13.45 | 17 |