MANGROVE PARTNERS IM, LLC BLFY — BLUE FOUNDRY BANCORP

Ownership history in MANGROVE PARTNERS IM, LLC  ·  10 quarters on record

AI Ownership Summary

MANGROVE PARTNERS IM, LLC reported BLUE FOUNDRY BANCORP (BLFY) in 10 quarterly 13F filings from 2023 Q4 through 2026 Q1. Peak portfolio weight reached 0.21% in 2026 Q1. The latest visible filing shows BLFY at 0.21% 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 BLFY 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 BLUE FOUNDRY BANCORP, 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

BLFY was reported at 0.21% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
0.21% in 2026 Q1

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

Time in book
Holding Window
2023 Q4 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.

BLFY stock page MANGROVE PARTNERS IM, LLC fund profile MANGROVE PARTNERS IM, LLC full holdings
How MANGROVE PARTNERS IM, LLC held BLFY — position size vs. price
% of Fund (quarterly)    BLFY price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 10 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2026 Q1 UNCHANGED — — — 198,659 — 0% 0.21% $2.6M 2026-05-15 $13.24
2025 Q4 ADDED — — — 198,659 +4,458 +2.3% 0.20% $2.5M 2026-02-17 $14.18
2025 Q3 ADDED — — — 194,201 +10,138 +5.5% 0.13% $1.8M 2025-11-14 $8.12
2025 Q2 UNCHANGED — — — 184,063 — 0% 0.19% $1.8M 2025-08-14 $9.17
2025 Q1 UNCHANGED — — — 184,063 — 0% 0.18% $1.7M 2025-05-15 $10.20
2024 Q4 REDUCED 5.0% -6.2% ✅ 184,063 -9,783 -5.0% 0.20% $1.8M 2025-02-14 $10.01
2024 Q3 UNCHANGED — — — 193,846 — 0% 0.17% $2.0M 2024-11-14 $11.17
2024 Q2 UNCHANGED — — — 193,846 — 0% 0.13% $1.8M 2024-08-14 $9.91
2024 Q1 UNCHANGED — — — 193,846 — 0% 0.13% $1.8M 2024-05-15 $9.10
2023 Q4 INITIATED — — — 193,846 — — 0.13% $1.9M 2024-02-14 $9.05

🏢 Other funds also holding BLFY

As of 2026 Q1 — sorted by position size

GARDNER LEWIS ASSET MANAGEMENT L P 3Y 7Y 2.92% Chicago Capital Management, LLC 3Y 7Y 1.2% First Trust Capital Management L.P. 3Y 7Y 0.7% GLAZER CAPITAL, LLC 3Y 7Y 0.48% Yakira Capital Management, Inc. 3Y 7Y 0.36% ABC ARBITRAGE SA 0.35% PRELUDE CAPITAL MANAGEMENT, LLC 3Y 7Y 0.34% Essex Financial Services, Inc. 3Y 7Y 0.24% Odyssean, LLC 0.21% OXFORD ASSET MANAGEMENT LLP 3Y 7Y 0.21%

FAQ About MANGROVE PARTNERS IM, LLC and BLFY

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 BLFY?

MANGROVE PARTNERS IM, LLC reported BLFY across 10 quarterly 13F filings, from 2023 Q4 through 2026 Q1.

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

The largest reported portfolio weight for BLFY was 0.21% in 2026 Q1.

What is the latest reported BLFY position on this page?

The most recent filing on this page is 2026 Q1, when MANGROVE PARTNERS IM, LLC reported 198,659 shares, equal to 0.21% of portfolio, with an estimated market value of $2.6M.

What does the chart on this BLFY ownership page compare?

The chart compares MANGROVE PARTNERS IM, LLC's quarterly BLFY 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 BLFY position?

Based on 13F filing dates vs. subsequent BLFY price moves, MANGROVE PARTNERS IM, LLC correctly timed 2 out of 4 reported position changes (50%). The annualised alpha on BLFY relative to SPY over the holding period was -1.8%.

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