Magnetar Financial LLC holds a focused book of 1129 stocks worth $9.8B as of Q1 2026 (disclosed May 13, 2026, a ~45-day 13F lag). This quarter they opened Penumbra Inc and trimmed Air Lease Corp. Their largest long position is Coreweave Inc-CL A at 48% of the equity book. They also disclosed $13.8M in put options (a bearish bet), shown separately below and excluded from the equity book.
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Use Arkolith to show Magnetar Financial LLC's latest holdings, largest changes, and filing provenance.
Top-heavy: focused book
Share of the disclosed book in its largest positions. A higher top-5 share means a more concentrated, higher-conviction portfolio.
88% mapped to company sectors
Direct operating-company sectors from our SIC-based security master. ETF/fund and unclassified holdings stay visible separately; this is not ETF look-through exposure.
Estimated $ traded · quarter-end prices, no cost basis
Bars show each stock's share of the portfolio. Click a row for its position history.
| # | Security | Value | Shares | % Port | Last move | History |
|---|---|---|---|---|---|---|
| 1 | Coreweave Inc COM CL A | $4.7B | 68.57M | 48.2% | ▲+0.5% Added · +375K sh | |
| 2 | Air Lease Corp CL A | $87.2M | 1.34M | 0.9% | ▼−15% Reduced · −245K sh | |
| 3 | Chart Inds Inc COM | $86.9M | 420.4K | 0.9% | ▼−16% Reduced · −81K sh | |
| 4 | TXNM Energy Inc COM | $86.2M | 1.48M | 0.9% | ▼−13% Reduced · −224K sh | |
| 5 | Penumbra Inc COM | $82.6M | 251.4K | 0.8% | ▲New New position | |
| 6 | Warner Bros Discovery Inc COM SER A | $81.7M | 3.02M | 0.8% | ▼−5.2% Reduced · −166K sh | |
| 7 | Proassurance Corp COM | $80.3M | 3.25M | 0.8% | ▼−6.8% Reduced · −238K sh | |
| 8 | Kenvue Inc COM | $79.4M | 4.61M | 0.8% | ▼−13% Reduced · −658K sh | |
| 9 | Webster Finl Corp COM | $78.9M | 1.14M | 0.8% | ▲150× Added · +1.1M sh | |
| 10 | Allied Gold Corp COM NEW | $78.1M | 2.52M | 0.8% | ▲New New position | |
| 11 | Norfolk Southn Corp COM | $77.7M | 275.2K | 0.8% | ▼−20% Reduced · −69K sh | |
| 12 | Teck Resources Ltd CL B | $77.5M | 1.50M | 0.8% | ▼−20% Reduced · −384K sh | |
| 13 | Masimo Corp COM | $76.0M | 427.1K | 0.8% | ▲78× Added · +422K sh | |
| 14 | Jd.com Inc NOTE 0.250% 6/0 | $74.6M | 74.69M | 0.8% | ▲+27% Added · +15.9M sh | |
| 15 | Trip Com Group Ltd NOTE 0.750% 6/1 | $71.6M | 69.42M | 0.7% | ▲+11% Added · +7.0M sh | |
| 16 | Digitalbridge Group Inc CL A NEW | $65.0M | 4.22M | 0.7% | ▲+91% Added · +2.0M sh | |
| 17 | CSG Sys Intl Inc COM | $64.5M | 807.4K | 0.7% | ▲+0.4% Added · +3K sh | |
| 18 | PG&E Corp NOTE 4.250%12/0 | $61.3M | 59.02M | 0.6% | ▲+57% Added · +21.5M sh | |
| 19 | Hewlett Packard Enterprise C 7.625 MAND CONV | $60.3M | 925.0K | 0.6% | ▲+85% Added · +425K sh | |
| 20 | Microchip Technology Inc. DEP SHS REPSTG | $58.9M | 1.02M | 0.6% | ▲New New position | |
| 21 | Amicus Therapeutic COM | $57.6M | 3.99M | 0.6% | ▲+0.5% Added · +18K sh | |
| 22 | Tri Pointe Homes Inc COM | $55.5M | 1.19M | 0.6% | ▲18× Added · +1.1M sh | |
| 23 | Silicon Laboratories Inc COM | $51.2M | 245.8K | 0.5% | ▲New New position | |
| 24 | Essential Utils Inc COM | $48.5M | 1.20M | 0.5% | ▲+0.4% Added · +5K sh | |
| 25 | Valaris Ltd CL A | $47.8M | 487.3K | 0.5% | ▲61× Added · +479K sh | |
| 26 | National Storage Affiliates COM SHS BEN IN | $46.4M | 1.23M | 0.5% | ▲New New position | |
| 27 | Alibaba Group Hldg Ltd NOTE 0.500% 6/0 | $45.5M | 32.74M | 0.5% | ▼−24% Reduced · −10.5M sh | |
| 28 | Arcellx Inc COMMON STOCK | $45.3M | 394.9K | 0.5% | ▲New New position | |
| 29 | Unifirst Corp Mass COM | $43.2M | 171.9K | 0.4% | ▲New New position | |
| 30 | Veeco Instrs Inc Del COM | $42.9M | 1.27M | 0.4% | ▼−25% Reduced · −425K sh | |
| 31 | Qorvo Inc COM | $41.9M | 541.2K | 0.4% | ▼−0.3% Reduced · −2K sh | |
| 32 | Thermon Group Hldgs Inc COM | $38.2M | 758.0K | 0.4% | ▲New New position | |
| 33 | Liberty Broadband Corp COM SER C | $36.4M | 723.8K | 0.4% | ▼−1.9% Reduced · −14K sh | |
| 34 | Apellis Pharmaceuticals Inc COM | $35.0M | 869.2K | 0.4% | ▲New New position | |
| 35 | Skywater Technology Inc COM | $32.2M | 1.18M | 0.3% | ▲New New position | |
| 36 | International Money Express COM | $30.4M | 1.92M | 0.3% | ▲+0.4% Added · +8K sh | |
| 37 | Oracle Corp 6.5 DEP CUM SR D | $29.8M | 650.0K | 0.3% | ▲New New position | |
| 38 | Stellar Bancorp Inc COM | $29.7M | 812.2K | 0.3% | ▲New New position | |
| 39 | Cantaloupe Inc COM | $29.0M | 2.68M | 0.3% | ▼−27% Reduced · −974K sh | |
| 40 | Sun Ctry Airls Hldgs Inc COM | $28.3M | 1.72M | 0.3% | ▲New New position | |
| 41 | Churchill Cap Corp XI CL A ORD SHS | $27.4M | 2.70M | 0.3% | ▲New New position | |
| 42 | Drugs Made In Amer Acq II Co USD ORD SHS | $26.9M | 2.70M | 0.3% | —Held | |
| 43 | Novanta Inc UNIT 11/01/2028 | $26.8M | 500.0K | 0.3% | ▲+400% Added · +400K sh | |
| 44 | Eqv Ventures Ac Corp. II ORD SHS CL A | $25.2M | 2.50M | 0.3% | —Held | |
| 45 | Titan Acquisition Corp CL A | $22.7M | 2.20M | 0.2% | —Held | |
| 46 | NextEra Energy Inc UNIT 02/15/2029 | $22.6M | 450.0K | 0.2% | ▲New New position | |
| 47 | Talkspace Inc COM | $22.0M | 4.26M | 0.2% | ▲New New position | |
| 48 | Rithm Ppty TR Inc COM NEW SHS | $21.9M | 1.64M | 0.2% | —Held | |
| 49 | Launch Two Acquisition Corp. ORD SHS CL A | $21.0M | 1.98M | 0.2% | —Held | |
| 50 | Launch One Acquisition Corp SHS CLASS A | $20.9M | 1.95M | 0.2% | —Held |
Put / call positions from the 13F — totals include every disclosed option leg
| Type | Underlying | Notional value | Underlying shares |
|---|---|---|---|
| PUT · bearish | ISHARES RUSSELL 2000 ETFIWM | $13.8M | 58K |
13F filers disclose option positions at the market value of the underlying the contracts reference, not the premium paid. A put is a bearish bet (it gains if the stock falls); a call is bullish. “Underlying shares” is the share count the contracts control, not a share holding. These legs are excluded from the equity book, weighting, concentration and sector figures above.
As-of date vs the date the SEC received each filing
| Quarter | As of | Filed | Positions | Value | Form |
|---|---|---|---|---|---|
| Q1 2026 | Mar 31, 2026 | May 13, 2026 | 1,755 | $9.8B | 13F-HR |
| Q4 2025 | Dec 31, 2025 | Feb 17, 2026 | 1,486 | $10.2B | 13F-HR |
| Q3 2025 | Sep 30, 2025 | Nov 13, 2025 | 1,474 | $16.5B | 13F-HR |
| Q2 2025 | Jun 30, 2025 | Aug 12, 2025 | 1,512 | $20.7B | 13F-HR |
| Q1 2025 | Mar 31, 2025 | May 15, 2025 | 1,329 | $7.6B | 13F-HR |
| Q4 2024 | Dec 31, 2024 | Feb 11, 2025 | 942 | $4.4B | 13F-HR |
| Q3 2024 | Sep 30, 2024 | Nov 13, 2024 | 829 | $4.6B | 13F-HR |
| Q2 2024 | Jun 30, 2024 | Aug 14, 2024 | 497 | $4.8B | 13F-HR |
| Q1 2024 | Mar 31, 2024 | May 15, 2024 | 363 | $4.5B | 13F-HR |
| Q4 2023 | Dec 31, 2023 | Feb 13, 2024 | 363 | $3.9B | 13F-HR |
| Q3 2023 | Sep 30, 2023 | Nov 14, 2023 | 435 | $3.9B | 13F-HR |
| Q2 2023 | Jun 30, 2023 | Aug 11, 2023 | 476 | $4.6B | 13F-HR |
| Q1 2023 | Mar 31, 2023 | May 15, 2023 | 597 | $5.1B | 13F-HR |
| Q4 2022 | Dec 31, 2022 | Feb 14, 2023 | 767 | $5.9B | 13F-HR |
| Q3 2022 | Sep 30, 2022 | Nov 14, 2022 | 1,356 | $7.2B | 13F-HR |
| Q2 2022 | Jun 30, 2022 | Aug 15, 2022 | 1,661 | $9.7B | 13F-HR |
| Q1 2022 | Mar 31, 2022 | May 16, 2022 | 1,308 | $9.4B | 13F-HR |
| Q4 2021 | Dec 31, 2021 | Feb 14, 2022 | 1,351 | $10.0B | 13F-HR |
| Q3 2021 | Sep 30, 2021 | Jan 14, 2022 | 1,287 | $9.8B | 13F-HR/A |
| Q2 2021 | Jun 30, 2021 | Aug 6, 2021 | 1,173 | $10.6B | 13F-HR |
| Q1 2021 | Mar 31, 2021 | May 14, 2021 | 1,026 | $10.4B | 13F-HR |
| Q4 2020 | Dec 31, 2020 | Feb 12, 2021 | 693 | $7.1B | 13F-HR |
| Q3 2020 | Sep 30, 2020 | Nov 16, 2020 | 641 | $5.7B | 13F-HR |
Holdings from SEC EDGAR 13F-HR filings, updated quarterly ~45 days after quarter-end. Public domain. The book and weighting are long equity only; disclosed put/call options are listed separately and excluded from those totals. Price-derived performance is withheld until the price-source policy and freshness gate are green.