MANGROVE PARTNERS IM, LLC NBBK — NB BANCORP INC

Ownership history in MANGROVE PARTNERS IM, LLC  ·  9 quarters on record

AI Ownership Summary

MANGROVE PARTNERS IM, LLC reported NB BANCORP INC (NBBK) in 9 quarterly 13F filings from 2024 Q1 through 2026 Q1. Peak portfolio weight reached 0.21% in 2024 Q4. The latest visible filing shows NBBK at 0.19% of the fund.

This page tracks quarterly shares, estimated market value, portfolio weight, filing dates, and disclosure-aligned stock prices directly from SEC EDGAR 13F filings.

What this NBBK ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was MANGROVE PARTNERS IM, LLC's position in NB BANCORP INC, and how did that conviction change over time? You can read the holding window, peak weight, latest reported size, disclosure timing, and quarter-by-quarter changes without piecing the story together from raw SEC rows.

Freshest filing
Latest Reported Filing
2026 Q1

NBBK was reported at 0.19% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
0.21% in 2024 Q4

Peak weight helps separate a token disclosure from a real conviction holding the fund genuinely cared about.

Time in book
Holding Window
2024 Q1 to 2026 Q1

Longer holding windows often tell a very different story from short-lived tactical trades or one-quarter experiments.

Decision context
Why It Matters
Position size beats headlines

Knowing that a fund owned a stock is useful. Knowing whether it was a 0.20% placeholder or a true high-conviction position is where the signal actually starts.

NBBK stock page MANGROVE PARTNERS IM, LLC fund profile MANGROVE PARTNERS IM, LLC full holdings
How MANGROVE PARTNERS IM, LLC held NBBK — position size vs. price
% of Fund (quarterly)    NBBK price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 9 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2026 Q1 UNCHANGED — — — 111,356 — 0% 0.19% $2.3M 2026-05-15 $19.17
2025 Q4 REDUCED — — — 111,356 -2,761 -2.4% 0.18% $2.2M 2026-02-17 $22.20
2025 Q3 ADDED — — — 114,117 +10,374 +10.0% 0.15% $2.0M 2025-11-14 $19.16
2025 Q2 UNCHANGED — — — 103,743 — 0% 0.20% $1.9M 2025-08-14 $18.25
2025 Q1 UNCHANGED — — — 103,743 — 0% 0.20% $1.9M 2025-05-15 $17.50
2024 Q4 REDUCED 10.0% +0.1% ❌ 103,743 -11,527 -10.0% 0.21% $1.9M 2025-02-14 $19.00
2024 Q3 UNCHANGED — — — 115,270 — 0% 0.18% $2.1M 2024-11-14 $19.99
2024 Q2 UNCHANGED — — — 115,270 — 0% 0.13% $1.7M 2024-08-14 $17.24
2024 Q1 INITIATED — — — 115,270 — — 0.11% $1.6M 2024-05-15 $15.39

🏢 Other funds also holding NBBK

As of 2026 Q1 — sorted by position size

Tieton Capital Management, LLC 3Y 7Y 3.91% Pertento Partners LLP 3Y 3.4% AltraVue Capital, LLC 3Y 7Y 2.37% Oppenheimer & Close, LLC 3Y 7Y 1.1% Stilwell Value LLC 3Y 7Y 0.82% EJF Capital LP 3Y 7Y 0.62% Legato Capital Management LLC 3Y 7Y 0.53% RAFFLES ASSOCIATES LP 3Y 7Y 0.27% Four Tree Island Advisory LLC 0.27% Round Rock Advisors LLC 3Y 0.21%

FAQ About MANGROVE PARTNERS IM, LLC and NBBK

These are the practical questions this page is built to answer before you even open the full history table.

How long has MANGROVE PARTNERS IM, LLC reported owning NBBK?

MANGROVE PARTNERS IM, LLC reported NBBK across 9 quarterly 13F filings, from 2024 Q1 through 2026 Q1.

What was the largest reported NBBK position in MANGROVE PARTNERS IM, LLC's portfolio?

The largest reported portfolio weight for NBBK was 0.21% in 2024 Q4.

What is the latest reported NBBK position on this page?

The most recent filing on this page is 2026 Q1, when MANGROVE PARTNERS IM, LLC reported 111,356 shares, equal to 0.19% of portfolio, with an estimated market value of $2.3M.

What does the chart on this NBBK ownership page compare?

The chart compares MANGROVE PARTNERS IM, LLC's quarterly NBBK portfolio weight with the stock's indexed share price, so you can see whether the fund was building, trimming, or holding the position as price moved.

How well did MANGROVE PARTNERS IM, LLC time their NBBK position?

Based on 13F filing dates vs. subsequent NBBK price moves, MANGROVE PARTNERS IM, LLC correctly timed 4 out of 4 reported position changes (100%). The annualised alpha on NBBK relative to SPY over the holding period was -6.6%.

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