SCHEDULE: Vanguard Group Discloses 5.02% Stake in NB Bancorp

The Vanguard Group reported a 5.02% beneficial ownership stake in NB Bancorp Inc, holding 2,301,034 shares of common stock as of December 31, 2025.

Summary

• The Vanguard Group reported beneficial ownership of 2,301,034 shares of NB Bancorp Inc common stock.
• This represents 5.02% of the class of securities.
• The Vanguard Group holds shared voting power over 294,807 shares and shared dispositive power over 2,301,034 shares.
• The filing was made under Rule 13d-1(b), indicating The Vanguard Group is an institutional investment adviser.
• An internal realignment occurred at The Vanguard Group on January 12, 2026, where it ceased performing portfolio management services and proxy voting, with subsidiaries expected to report beneficial ownership separately.

Sentiment

Score: 5

Explanation: StockSavvy.ai views this as a neutral filing, as it is a standard regulatory disclosure of beneficial ownership by a large institutional investor and does not contain performance-related information or significant strategic shifts for the issuer.

Positives

• A major institutional investor like The Vanguard Group holding a significant stake (over 5%) can be seen as a vote of confidence in NB Bancorp Inc.
• The acquisition of shares was in the ordinary course of business, not for control purposes, indicating a passive investment strategy.

Future Outlook

This Schedule 13G filing does not contain forward-looking statements or guidance regarding NB Bancorp Inc's future performance or The Vanguard Group's investment strategy beyond the internal realignment.

Management Comments

• The Vanguard Group, Inc. anticipates that certain subsidiaries or business divisions of subsidiaries of The Vanguard Group, Inc., that currently have, or are deemed to have, beneficial ownership with The Vanguard Group, Inc., will report beneficial ownership separately (on a disaggregated basis) from The Vanguard Group, Inc. in reliance on such release.
• These subsidiaries and/or business divisions pursue the same investment strategies as previously pursued by The Vanguard Group, Inc. prior to the realignment.
• The securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under 240.14a-11.

Industry Context

StockSavvy.ai notes that Schedule 13G filings are routine disclosures by institutional investors like The Vanguard Group, indicating passive ownership stakes exceeding 5%. This filing reflects a standard portfolio allocation by a major asset manager rather than a strategic move to influence NB Bancorp Inc's operations. The internal realignment within Vanguard is a significant operational change for the firm itself, impacting how its various entities will report ownership going forward, but it does not directly reflect on NB Bancorp Inc's industry position.

Stakeholder Impact

• Shareholders of NB Bancorp Inc: Provides transparency regarding a significant institutional holder's stake, potentially reinforcing confidence in the company.
• Clients of The Vanguard Group: The internal realignment means their beneficial ownership will be reported differently (disaggregated) in future filings.

Next Steps

• The Vanguard Group anticipates that certain subsidiaries or business divisions will report beneficial ownership separately (on a disaggregated basis) from The Vanguard Group, Inc. following the internal realignment.

Key Dates

Recommendation

This Schedule 13G filing is a routine disclosure of a passive ownership stake by a major institutional investor. It provides no new information regarding NB Bancorp Inc's financial performance, strategic direction, or operational health that would warrant a change in investment recommendation. The stake is held in the ordinary course of business, indicating a long-term, passive investment approach. Therefore, a 'hold' recommendation is appropriate as the filing itself does not present a compelling reason to buy or sell based solely on this information.

Keywords

NB Bancorp Inc, Vanguard Group, Schedule 13G, Beneficial Ownership, Common Stock, Institutional Investor, Investment Adviser, Equity Stake, SEC Filing