NB Bancorp
NBBK
177 hedge funds and large institutions have $486M invested in NB Bancorp in 2026 Q1 according to their latest regulatory filings, with 33 funds opening new positions, 65 increasing their positions, 44 reducing their positions, and 17 closing their positions.
1,289% more call options, than puts
Call options by funds: $3.57M | Put options by funds: $257K
100% more funds holding in top 10
Funds holding in top 10: 1 → 2 (+1)
94% more first-time investments, than exits
New positions opened: 33 | Existing positions closed: 17
48% more repeat investments, than reductions
Existing positions increased: 65 | Existing positions reduced: 44
10% more capital invested
Capital invested by funds: $441M → $486M (+$45.2M)
9% more funds holding
Funds holding: 163 → 177 (+14)
5.28% less ownership
Funds ownership: 55.91% → 50.62% (-5.3%)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
AC
AltraVue Capital
Bellevue,
Washington
|
+$12.8M |
| 2 |
Dimensional Fund Advisors
Austin,
Texas
|
+$4.93M |
| 3 |
State Street
Boston,
Massachusetts
|
+$3.77M |
| 4 |
SEI Investments
Oaks,
Pennsylvania
|
+$3.33M |
| 5 |
Qube Research & Technologies (QRT)
London,
United Kingdom
|
+$3.32M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Wellington Management Group
Boston,
Massachusetts
|
-$16M |
| 2 |
Hotchkis & Wiley Capital Management
Los Angeles,
California
|
-$5.28M |
| 3 |
Marshall Wace
London,
United Kingdom
|
-$4.98M |
| 4 |
PP
Pertento Partners
London,
United Kingdom
|
-$2.88M |
| 5 |
EC
EJF Capital
Arlington,
Virginia
|
-$2.81M |
NBBK Hedge Fund Activity: Q1 2026 in Review
177 of the 8,187 institutional investors tracked by Wall St. Rank reported a position in NB Bancorp (NBBK) for Q1 2026, worth a combined $486M — up 10% from $441M a quarter earlier.
Buyers outnumbered sellers: 33 funds opened new NBBK positions and 17 closed out — a net gain of 16 holders — while 65 added to existing stakes and 44 trimmed.
The largest buyer was AltraVue Capital, adding an estimated $12.8M. The largest seller was Wellington Management Group, cutting an estimated $16M.
- 177 institutional investors held NB Bancorp (NBBK) as of Q1 2026, up from 163 in Q4 2025.
- Funds reported $486M of NB Bancorp stock for Q1 2026, up 10% quarter-over-quarter.
- 33 funds opened new NB Bancorp positions in Q1 2026 and 17 closed out, a net change of +16 holders.
- The largest NB Bancorp buyer in Q1 2026 was AltraVue Capital, an estimated $12.8M added.
- The largest NB Bancorp seller in Q1 2026 was Wellington Management Group, an estimated $16M sold.
Based on aggregated 13F filings for Q1 2026.