13F filer · CIK 1352851 ↗
Magnetar Financial LLC
You are looking at Q1 2021. See the latest, Q2 2026 →
Reported value
$10.40B
+47% on the quarter before
Positions
1,026
674 new · 341 sold out
Top 10
21.6%
of the value
Est. gain
−$24.7M
on stocks held all quarter
Est. return
−0.6%
on those stocks since Q4 2020
Positions as of Mar 31, 2021, from Magnetar Financial LLC's 13F filing with the SEC. A 13F lists a manager's US-listed stocks and options at a quarter end and is filed up to 45 days later, so the fund may hold something else today. It leaves out short positions, cash and holdings outside the US.
Portfolio at a glance
- New
- Added
- Cut
- Same
- Options
The 24 largest positions, 40% of the reported value, each sized by its share, colored by what the fund did with it since Q4 2020. Striped tiles are options.
Largest buys
Since Q4 2020, by estimated size: the change in shares at the quarter-end price, since a 13F gives no trade prices. Percentages are the position's share of the portfolio, before and after.
- Pra Health Sciences Inc~$215.1MNew · 0.0% → 2.1%+1,402,678 shares
- Kansas City Southern~$214.8MNew · 0.0% → 2.1%+813,704 shares
- Coherent Inc~$203.4MNew · 0.0% → 2.0%+804,364 shares
- Change Healthcare Inc~$179.6MAdded · 0.2% → 1.9%+8,126,879 shares
- Flir Sys Inc~$167.8MAdded · 0.0% → 1.6%+2,972,105 shares
- Perspecta Inc~$162.5MNew · 0.0% → 1.6%+5,594,899 shares
- Shaw Communications Inc~$134.2MNew · 0.0% → 1.3%+5,159,502 shares
- Athene Holding Ltd~$133.2MAdded · 0.0% → 1.3%+2,643,735 shares
- Magellan Health Inc~$128.1MNew · 0.0% → 1.2%+1,374,281 shares
- Peoples United Financial Inc~$126.4MNew · 0.0% → 1.2%+7,061,166 shares
Largest sells
Since Q4 2020, by estimated size: the change in shares at the quarter-end price, since a 13F gives no trade prices. Percentages are the position's share of the portfolio, before and after.
- Churchill Capital Corp Iv~$185.2MSold out · 2.6% → 0.0%−17,982,000 shares
- Acacia Communications Inc~$116.1MSold out · 1.6% → 0.0%−1,590,626 shares
- Bmc Stk Hldgs Inc~$102.9MSold out · 1.5% → 0.0%−1,917,079 shares
- Eidos Therapeutics Inc~$78.9MSold out · 1.1% → 0.0%−599,330 shares
- Tiffany & Co New~$75.4MSold out · 1.1% → 0.0%−573,444 shares
- Ftac Olympus Acquisition Cor~$71.4MSold out · 1.0% → 0.0%−6,572,255 shares
- Parsley Energy Inc~$70.3MSold out · 1.0% → 0.0%−4,947,949 shares
- Fitbit Inc~$68.0MSold out · 1.0% → 0.0%−9,996,246 shares
- Norbord Inc~$61.6MSold out · 0.9% → 0.0%−1,426,600 shares
- Ciig Merger Corp~$54.6MSold out · 0.8% → 0.0%−1,940,616 shares
Holdings
As of Mar 31, 2021. Changes are in shares against Dec 31, 2020, so a price move alone never reads as a buy or a sale.
| Holding | Value | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Opendoor Technologies IncCOM · shares −10% · price +14.0% | 4.4% | $454.7M | +$55.9M | ||||||||
| Pra Health Sciences IncCOM · shares New | 2.1% | $215.1M | — | ||||||||
| Kansas City SouthernCOM NEW · shares New | 2.1% | $214.8M | — | ||||||||
| Inphi CorpCOM · shares −5.0% · price +11.2% | 2.1% | $214.1M | +$21.5M | ||||||||
| Willis Towers Watson Plc LtdSHS · shares −3.1% · price +8.6% | 2.0% | $203.6M | +$16.2M | ||||||||
| Coherent IncCOM · shares New | 2.0% | $203.4M | — | ||||||||
| Alexion Pharmaceuticals IncCOM · shares +9.2% · price −2.1% | 1.9% | $197.2M | −$3.9M | ||||||||
| Change Healthcare IncCOM · shares +1,160% · price +18.5% | 1.9% | $195.1M | +$2.4M | ||||||||
| Xilinx IncCOM · shares +3.6% · price −12.6% | 1.7% | $175.4M | −$24.4M | ||||||||
| Flir Sys IncCOM · shares +26,409% · price +28.9% | 1.6% | $168.5M | +$142,512 | ||||||||
| Maxim Integrated Prods IncCOM · shares −5.1% · price +3.1% | 1.6% | $165.8M | +$4.9M | ||||||||
| Perspecta IncCOM · shares New | 1.6% | $162.5M | — | ||||||||
| Varian Med Sys IncCOM · shares +5.0% · price +0.9% | 1.5% | $161.0M | +$1.3M | ||||||||
| Pnm Res IncCOM · shares +5.1% · price +1.1% | 1.5% | $156.9M | +$1.6M | ||||||||
| Aerojet Rocketdyne Hldgs IncCOM · shares +32% · price −11.1% | 1.4% | $143.2M | −$13.6M | ||||||||
| Hms Hldgs CorpCOM · shares +74% · price +0.6% | 1.3% | $138.6M | +$482,618 | ||||||||
| Shaw Communications IncCL B CONV · shares New | 1.3% | $134.2M | — | ||||||||
| Athene Holding LtdCL A · shares +22,977% · price +16.9% | 1.3% | $133.8M | +$83,902 | ||||||||
| Navistar Intl Corp NewCOM · shares +6.2% · price +0.2% | 1.3% | $131.4M | +$196,608 | ||||||||
| Magellan Health IncCOM NEW · shares New | 1.2% | $128.1M | — | ||||||||
| Peoples United Financial IncCOM · shares New | 1.2% | $126.4M | — | ||||||||
| Gw Pharmaceuticals PlcADS · shares New | 1.2% | $125.3M | — | ||||||||
| Churchill Capital Corp IvCL A · shares New | 1.2% | $121.9M | — | ||||||||
| Churchill Capital Corp ViiUNIT 99/99/9999 ADDED · shares New | 1.1% | $110.3M | — | ||||||||
| Genmark Diagnostics IncCOM · shares New | 1.00% | $103.9M | — | ||||||||
| Total · 1,026 positions | 100% | $10.40B | −$24.7M |
Price is a stock's reported value over its shares at the quarter end. The estimated gain is the shares held at both quarter ends times the change in that price: shares bought or sold during the quarter add nothing, options are left out, and a stock split is read into the earlier share count and price.
What made money
From Q4 2020 to Q1 2021: 339 stocks held throughout, down $24.7M (−0.6%).
- Opendoor Technologies Inc+$55.9M+14%
- Inphi Corp+$21.5M+11%
- Willis Towers Watson Plc Ltd+$16.2M+9%
- Tcf Finl Corp+$12.1M+25%
- Tilray Inc+$5.1M+175%
- Aerojet Rocketdyne Hldgs Inc−$13.6M−11%
- Grubhub Inc−$13.9M−19%
- Executive Network Partnering−$17.1M−61%
- Multiplan Corporation−$21.7M−31%
- Xilinx Inc−$24.4M−13%
Estimated as in the holdings table: shares held at both quarter ends times the change in price; options left out.
Reported value by quarter
The total value of each quarter's 13F at that quarter end. It moves with prices as well as with buying and selling. Pick a quarter to see what the fund held then.
Every quarter's filing
| Quarter | Reported value | Filing | |
|---|---|---|---|
| Q2 2026 | Aug 14, 2026 | $10.96B+11% | SEC ↗ |
| Q1 2026 | May 13, 2026 | $9.84B−4% | SEC ↗ |
| Q4 2025 | Feb 17, 2026 | $10.21B−38% | SEC ↗ |
| Q3 2025 | Nov 13, 2025 | $16.50B−20% | SEC ↗ |
| Q2 2025 | Aug 12, 2025 | $20.65B+171% | SEC ↗ |
| Q1 2025 | May 15, 2025 | $7.61B+75% | SEC ↗ |
| Q4 2024 | Feb 11, 2025 | $4.36B−6% | SEC ↗ |
| Q3 2024 | Nov 13, 2024 | $4.62B−4% | SEC ↗ |
| Q2 2024 | Aug 14, 2024 | $4.80B+7% | SEC ↗ |
| Q1 2024 | May 15, 2024 | $4.47B+13% | SEC ↗ |
| Q4 2023 | Feb 13, 2024 | $3.94B+1% | SEC ↗ |
| Q3 2023 | Nov 14, 2023 | $3.92B−14% | SEC ↗ |
| Q2 2023 | Aug 11, 2023 | $4.56B−11% | SEC ↗ |
| Q1 2023 | May 15, 2023 | $5.13B−13% | SEC ↗ |
| Q4 2022 | Feb 14, 2023 | $5.91B−18% | SEC ↗ |
| Q3 2022 | Nov 14, 2022 | $7.21B−25% | SEC ↗ |
| Q2 2022 | Aug 15, 2022 | $9.67B+3% | SEC ↗ |
| Q1 2022 | May 16, 2022 | $9.37B−6% | SEC ↗ |
| Q4 2021 | Feb 14, 2022 | $9.96B+1% | SEC ↗ |
| Q3 2021 | Jan 14, 2022 (amended) | $9.82B−7% | SEC ↗ |
| Q2 2021 | Aug 6, 2021 | $10.56B+2% | SEC ↗ |
| Q1 2021 | May 14, 2021 | $10.40B+47% | SEC ↗ |
| Q4 2020 | Feb 12, 2021 | $7.08B+25% | SEC ↗ |
| Q3 2020 | Nov 16, 2020 | $5.66B+67% | SEC ↗ |
| Q2 2020 | Aug 14, 2020 | $3.39B−18% | SEC ↗ |
| Q1 2020 | May 15, 2020 | $4.15B−13% | SEC ↗ |
| Q4 2019 | Feb 13, 2020 | $4.79B+22% | SEC ↗ |
| Q3 2019 | Nov 14, 2019 | $3.93B−21% | SEC ↗ |
| Q2 2019 | Aug 14, 2019 | $5.00B+29% | SEC ↗ |
| Q1 2019 | May 15, 2019 | $3.89B−5% | SEC ↗ |
| Q4 2018 | Feb 14, 2019 | $4.08B−26% | SEC ↗ |
| Q3 2018 | Feb 14, 2019 (amended) | $5.54B−16% | SEC ↗ |
| Q2 2018 | Aug 14, 2018 (amended) | $6.56B+13% | SEC ↗ |
| Q1 2018 | May 15, 2018 (amended) | $5.80B+3% | SEC ↗ |
| Q4 2017 | Feb 14, 2018 (amended) | $5.62B+2% | SEC ↗ |
| Q3 2017 | Nov 14, 2017 (amended) | $5.52B−15% | SEC ↗ |
| Q2 2017 | Aug 14, 2017 (amended) | $6.52B−7% | SEC ↗ |
| Q1 2017 | May 15, 2017 (amended) | $7.02B+1,897% | SEC ↗ |
| Q4 2016 | Aug 14, 2017 (amended) | $351.5M−95% | SEC ↗ |
| Q3 2016 | Nov 14, 2016 (amended) | $7.03B+17% | SEC ↗ |
| Q2 2016 | Aug 15, 2016 (amended) | $6.02B−7% | SEC ↗ |
| Q1 2016 | May 16, 2016 (amended) | $6.49B | SEC ↗ |