Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
79 institutional managers reported holding NMM for the quarter ended Mar 31, 2026. Together they hold about 31% of shares outstanding; the top 10 hold 26%. 19 opened new positions; 11 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Pilgrim Global Advisors LLC (focused) | 4.64M | 16.18% | $312.8M | unchanged | 2023 Q4 |
| Morgan Stanley | 1.18M | 4.10% | $79.3M | added +18.7% | ≤2013 |
| ION Fund Management LTD | 430.9k | 1.50% | $29.1M | trimmed -7.5% | 2025 Q4 |
| Armor Advisors, L.l.c. (focused) | 201.8k | 0.70% | $13.6M | unchanged | 2024 Q3 |
| Bank OF America CORP /DE/ | 199.1k | 0.69% | $13.4M | added +57.6% | ≤2013 |
| ING Groep NV | 161.5k | 0.56% | $10.9M | added +10.2% | 2024 Q1 |
| Walleye Capital LLC | 157.5k | 0.55% | $10.6M | added +1019.5% | 2025 Q4 |
| Natixis Advisors, LLC | 154.2k | 0.54% | $10.4M | trimmed -4.1% | 2023 Q4 |
| Acadian Asset Management | 132.7k | 0.46% | $8.9M | opened | 2026 Q1 |
| HRT Financial LP | 118.9k | 0.41% | $8.0M | added +1416.2% | 2023 Q2 |
| Raymond James Financial INC | 105.0k | 0.37% | $7.1M | added +17.3% | 2024 Q1 |
| Gratia Capital, LLC (focused) | 101.9k | 0.35% | $6.9M | trimmed -24.4% | 2021 Q2 |
| IEQ Capital, LLC | 91.3k | 0.32% | $6.2M | unchanged | 2024 Q2 |
| Merrion Investment Management CO, LLC | 87.5k | 0.30% | $5.9M | added +14.6% | 2024 Q3 |
| Citadel Advisors | 72.9k | 0.25% | $4.9M | trimmed -43.4% | 2020 Q4 |
| Group ONE Trading LLC | 71.5k | 0.25% | $4.8M | trimmed -6.9% | 2021 Q1 |
| Two Sigma | 70.8k | 0.25% | $4.8M | added +586.3% | 2023 Q4 |
| Susquehanna International Group | 69.6k | 0.24% | $4.7M | trimmed -60.4% | 2025 Q2 |
| Millennium Management | 69.3k | 0.24% | $4.7M | added +140.9% | 2025 Q4 |
| Pinnacle Holdings, LLC | 64.8k | 0.23% | $4.4M | trimmed -1.1% | ≤2013 |
| Jane Street | 59.1k | 0.21% | $4.0M | added +31% | 2024 Q1 |
| Moors & Cabot, INC. | 58.2k | 0.20% | $3.9M | trimmed -34.6% | 2023 Q1 |
| BNP Paribas Financial Markets | 58.1k | 0.20% | $3.9M | added +331% | 2021 Q4 |
| Marnell Management LLC | 57.7k | 0.20% | $3.9M | trimmed -39.8% | 2025 Q4 |
| Point72 | 54.7k | 0.19% | $3.7M | opened | 2026 Q1 |
| Mraz, Amerine & Associates, INC. | 43.0k | 0.15% | $2.9M | unchanged | 2022 Q4 |
| XTX Topco LTD | 31.5k | 0.11% | $2.1M | added +349.1% | 2025 Q4 |
| Jump Financial | 30.3k | 0.11% | $2.0M | trimmed -17.7% | 2023 Q3 |
| Live Oak Investment Partners | 29.4k | 0.10% | $2.0M | trimmed -8.8% | 2025 Q1 |
| Focus Partners Wealth | 28.4k | 0.10% | $1.9M | opened | 2026 Q1 |
| SEI Investments CO | 28.0k | 0.10% | $1.9M | opened | 2026 Q1 |
| Arbiter Partners Capital Management LLC (focused) | 24.8k | 0.09% | $1.7M | unchanged | 2025 Q3 |
| Goldman Sachs | 21.4k | 0.07% | $1.4M | opened | 2026 Q1 |
| Wells Fargo & COMPANY/MN | 19.1k | 0.07% | $1.3M | added +2460% | ≤2013 |
| UBS | 16.0k | 0.06% | $1.1M | added +340.3% | ≤2013 |
| LPL Financial LLC | 15.2k | 0.05% | $1.0M | added +85.2% | 2025 Q3 |
| Cetera Investment Advisers | 12.9k | 0.04% | $871k | trimmed -12.2% | 2025 Q2 |
| Marex Group plc | 12.8k | 0.04% | $864k | opened | 2026 Q1 |
| Ameriprise Financial INC | 12.7k | 0.04% | $853k | opened | 2026 Q1 |
| Susquehanna Portfolio Strategies, LLC | 11.1k | 0.04% | $745k | unchanged | 2025 Q3 |
| Empowered Funds, LLC | 10.9k | 0.04% | $736k | added +74.1% | 2025 Q4 |
| SG Americas Securities, LLC | 9.2k | 0.03% | $622k | opened | 2026 Q1 |
| Stifel Financial CORP | 8.9k | 0.03% | $602k | unchanged | 2021 Q1 |
| Fiera Capital CORP | 8.3k | 0.03% | $561k | opened | 2026 Q1 |
| National Philanthropic Trust | 8.0k | 0.03% | $536k | unchanged | 2025 Q3 |
| Westhampton Capital, LLC | 7.7k | 0.03% | $516k | unchanged | 2024 Q1 |
| SOA Wealth Advisors, LLC. | 5.1k | 0.02% | $345k | unchanged | 2021 Q3 |
| Citigroup INC | 5.0k | 0.02% | $339k | added +140.8% | 2024 Q3 |
| Simplex Trading, LLC | 4.8k | 0.02% | $327k | opened | 2019 Q2 |
| State of Wyoming | 4.6k | 0.02% | $313k | added +77.8% | 2025 Q4 |
Largest 50 of 79 shown; the full ranked, searchable register is at boothcheck.com/holders/NMM. Related filers are grouped using the filings' own included-manager declarations. Historically, several managers opening new positions in the same quarter said almost nothing about the quarter that followed (59,118 cases since 2013). A filed record, not a forecast. Nothing here is investment advice.