Latest Period
Q4 2025
Security Snapshot
NB Bancorp, Inc. - Common Stock (NBBK) Institutional Ownership
CUSIP: 63945M107
13F Institutional Holders and Ownership History from Q4 2023 to Q1 2026
Institutions Reporting
162
Shares (Excl. Options)
22,272,139
Price
$19.82
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- Type / Class
- Equity / Common Stock
- Symbol
- NBBK on Nasdaq
- Shares outstanding
- 45,552,773
- Price per share
- $21.07
- All holders as of 31 Dec 2025
- Q4 2025
- Total 13F shares
- 22,272,139
- Total reported value
- $441,275,863
- % of total 13F portfolios
- 0%
- Share change
- +3,119,722
- Value change
- +$62,745,151
- Number of holders
- 162
- Price from insider filings
- $21.07
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Quick Takeaways
- NBBK - NB Bancorp, Inc. - Common Stock is tracked under CUSIP 63945M107.
- 162 institutions reported positions in Q4 2025.
- 3 significant owners is listed from Schedule 13D/13G reporting.
What Changed
- Holder count moved from 162 to 38 between Q4 2025 and Q1 2026.
- Reported value moved from $441,275,863 to $26,479,067.
Why This Matters
- 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.
Source Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 162 institutions filings for Q4 2025.
Investment Quick Answers
What is CUSIP 63945M107?
CUSIP 63945M107 identifies NBBK - NB Bancorp, Inc. - Common Stock in SEC 13F datasets.
Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.
Next ownership checks
Use the next link that matches the question you still need to answer about this security.
- Latest 13F filings when you want to inspect fresh institutional portfolio moves.
- Latest Schedule 13D/13G reports when you need large-owner changes outside the 13F cycle.
- All institutional ownership pages to compare this security with other holder-history pages.
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 63945M107:
Significant Owners of NB Bancorp, Inc. - Common Stock (NBBK) based on Schedule 13D/G filings
| 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 | 5.1% | -2% | $41,633,969 | +$3,998,788 | 2,338,987 | +11% | Pertento Partners LLP | 01 Dec 2025 |
As of 31 Dec 2025, 162 institutional investors reported holding 22,272,139 shares of NB Bancorp, Inc. - Common Stock (NBBK). This represents 49% of the company’s total 45,552,773 outstanding shares.
Top 25 Institutional Shareholders
The largest institutional shareholders of NB Bancorp, Inc. - Common Stock (NBBK) together control 39% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 6.8% | 3,103,770 | +10% | 0% | $61,516,713 |
| Pertento Partners LLP | 5.1% | 2,343,776 | +11% | 5.1% | $46,453,640 |
| VANGUARD GROUP INC | 5.1% | 2,301,034 | +18% | 0% | $45,606,494 |
| WELLINGTON MANAGEMENT GROUP LLP | 3.2% | 1,471,189 | -19% | 0.01% | $29,158,966 |
| STATE STREET CORP | 2.4% | 1,114,379 | -6.9% | 0% | $22,086,992 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.1% | 966,662 | +10% | 0% | $19,162,447 |
| HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC | 1.5% | 701,992 | +1% | 0.04% | $13,913,481 |
| AltraVue Capital, LLC | 1.5% | 693,000 | 1.1% | $13,735,260 | |
| GOLDMAN SACHS GROUP INC | 1.3% | 593,888 | +13% | 0% | $11,770,865 |
| Tieton Capital Management, LLC | 1.2% | 524,935 | 3.6% | $10,404,000 | |
| FMR LLC | 0.84% | 383,212 | +18% | 0% | $7,595,263 |
| Nuveen, LLC | 0.76% | 346,779 | +219% | 0% | $6,873,159 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 0.72% | 329,398 | +15% | 0% | $6,528,668 |
| NORTHERN TRUST CORP | 0.71% | 324,313 | +4.7% | 0% | $6,427,883 |
| DIMENSIONAL FUND ADVISORS LP | 0.63% | 288,028 | 0% | $5,708,814 | |
| ALLIANCEBERNSTEIN L.P. | 0.56% | 254,219 | +524% | 0% | $5,038,621 |
| TWO SIGMA INVESTMENTS, LP | 0.56% | 252,845 | +23% | 0.01% | $5,011,388 |
| MARSHALL WACE, LLP | 0.55% | 251,512 | -9.2% | 0% | $4,984,968 |
| RENAISSANCE TECHNOLOGIES LLC | 0.55% | 251,274 | +127% | 0.01% | $4,980,251 |
| MORGAN STANLEY | 0.53% | 242,132 | +98% | 0% | $4,799,057 |
| AMERICAN CENTURY COMPANIES INC | 0.49% | 221,855 | +62% | 0% | $4,397,166 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 0.42% | 193,150 | +68% | 0.08% | $3,828,233 |
| HENNESSY ADVISORS INC | 0.4% | 181,000 | -2.2% | 0.13% | $3,587,420 |
| EJF Capital LP | 0.38% | 174,979 | +1.3% | 2% | $3,468,084 |
| Legato Capital Management LLC | 0.38% | 171,361 | 0.29% | $3,396,375 |
Institutional Holders of NB Bancorp, Inc. - Common Stock (NBBK) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 1,254,554 | $26,479,067 | +$6,324,926 | $21.07 | 38 |
| 2025 Q4 | 22,272,139 | $441,275,863 | +$62,745,151 | $19.82 | 162 |
| 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 |