127 institutions reported holding $160.2M of BLUE FOUNDRY BANCORP (BLFY) in SEC 13F filings for 2026-03-31. Largest institutional holders: GLAZER CAPITAL, LLC ($22.7M), BlackRock, Inc. ($16.8M), GARDNER LEWIS ASSET MANAGEMENT L P ($13.5M), First Trust Capital Management L.P. ($13.3M), VANGUARD CAPITAL MANAGEMENT LLC ($10.1M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | GLAZER CAPITAL, LLC | $22.7M | 1.7M | Added |
| 2 | BlackRock, Inc. | $16.8M | 1.3M | Trimmed |
| 3 | GARDNER LEWIS ASSET MANAGEMENT L P | $13.5M | 1.0M | Added |
| 4 | First Trust Capital Management L.P. | $13.3M | 1.0M | Added |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | $10.1M | 765,793 | New |
| 6 | DIMENSIONAL FUND ADVISORS LP | $9.1M | 684,600 | Trimmed |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | $5.6M | 421,058 | Added |
| 8 | STATE STREET CORP | $5.4M | 411,028 | Trimmed |
| 9 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | $4.7M | 358,672 | Added |
| 10 | RENAISSANCE TECHNOLOGIES LLC | $4.5M | 338,400 | Added |
| 11 | PRELUDE CAPITAL MANAGEMENT, LLC | $4.4M | 333,785 | Added |
| 12 | Essex Financial Services, Inc. | $4.3M | 321,281 | Trimmed |
| 13 | ABC ARBITRAGE SA | $2.7M | 200,781 | Hold |
| 14 | MANGROVE PARTNERS IM, LLC | $2.6M | 198,659 | Hold |
| 15 | MILLENNIUM MANAGEMENT LLC | $2.5M | 191,747 | Added |
| 16 | Russell Investments Group, Ltd. | $2.0M | 154,796 | Added |
| 17 | Squarepoint Ops LLC | $2.0M | 152,559 | Added |
| 18 | NORTHERN TRUST CORP | $2.0M | 147,371 | Added |
| 19 | GOLDMAN SACHS GROUP INC | $1.6M | 124,296 | Added |
| 20 | VANGUARD FIDUCIARY TRUST CO | $1.5M | 112,808 | New |
| 21 | Chicago Capital Management, LLC | $1.5M | 146,012 | Added |
| 22 | VANGUARD PORTFOLIO MANAGEMENT LLC | $1.4M | 104,024 | New |
| 23 | D. E. Shaw & Co., Inc. | $1.3M | 98,540 | Trimmed |
| 24 | TUDOR INVESTMENT CORP ET AL | $1.3M | 97,253 | Hold |
| 25 | MORGAN STANLEY | $1.3M | 97,060 | Trimmed |
Source: SEC Form 13F filings · as of 2026-03-31