13F filer · CIK 1352851 ↗
Magnetar Financial LLC
You are looking at Q4 2020. See the latest, Q2 2026 →
Reported value
$7.08B
+25% on the quarter before
Positions
693
412 new · 359 sold out
Top 10
28.2%
of the value
Est. gain
+$212.6M
on stocks held all quarter
Est. return
+8.7%
on those stocks since Q3 2020
Positions as of Dec 31, 2020, 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, 44% of the reported value, each sized by its share, colored by what the fund did with it since Q3 2020. Striped tiles are options.
Largest buys
Since Q3 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.
- Opendoor Technologies Inc~$445.3MNew · 0.0% → 6.3%+23,960,401 shares
- Inphi Corp~$200.4MAdded · 0.0% → 2.9%+1,249,063 shares
- Xilinx Inc~$193.7MNew · 0.0% → 2.7%+1,366,300 shares
- Alexion Pharmaceuticals Inc~$184.5MNew · 0.0% → 2.6%+1,180,653 shares
- Pnm Res Inc~$147.7MNew · 0.0% → 2.1%+3,043,242 shares
- Navistar Intl Corp New~$123.6MNew · 0.0% → 1.7%+2,811,045 shares
- Aerojet Rocketdyne Hldgs Inc~$122.3MNew · 0.0% → 1.7%+2,314,718 shares
- Slack Technologies Inc~$100.4MNew · 0.0% → 1.4%+2,376,122 shares
- Hms Hldgs Corp~$78.9MNew · 0.0% → 1.1%+2,148,016 shares
- Eidos Therapeutics Inc~$78.9MNew · 0.0% → 1.1%+599,330 shares
Largest sells
Since Q3 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.
- Livongo Health Inc~$157.0MSold out · 2.8% → 0.0%−1,121,264 shares
- E Trade Financial Corp~$146.4MSold out · 2.6% → 0.0%−2,925,441 shares
- Wright Med Group N V~$140.7MSold out · 2.5% → 0.0%−4,607,681 shares
- Td Ameritrade Hldg Corp~$134.8MSold out · 2.4% → 0.0%−3,443,118 shares
- Churchill Cap Corp Iii~$112.6MSold out · 2.0% → 0.0%−10,989,997 shares
- Momenta Pharmaceuticals Inc~$102.1MSold out · 1.8% → 0.0%−1,946,428 shares
- Immunomedics Inc~$89.5MSold out · 1.6% → 0.0%−1,052,070 shares
- Flying Eagle Acquisition Cor~$88.6MSold out · 1.6% → 0.0%−6,862,653 shares
- Advanced Disp Svcs Inc Del~$77.9MSold out · 1.4% → 0.0%−2,577,022 shares
- Aimmune Therapeutics Inc~$66.3MSold out · 1.2% → 0.0%−1,925,576 shares
Holdings
As of Dec 31, 2020. Changes are in shares against Sep 30, 2020, so a price move alone never reads as a buy or a sale.
| Holding | Value | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Opendoor Technologies IncCOM ADDED · shares New | 6.3% | $445.3M | — | ||||||||
| Inphi CorpCOM · shares +8,913% · price +43.0% | 2.9% | $202.7M | +$675,827 | ||||||||
| Xilinx IncCOM · shares New | 2.7% | $193.7M | — | ||||||||
| Willis Towers Watson Plc LtdSHS · shares −7.7% · price +0.9% | 2.7% | $193.3M | +$1.7M | ||||||||
| Churchill Capital Corp IvUNIT 99/99/9999 · shares 0% · price +2.8% | 2.6% | $185.2M | +$5.0M | ||||||||
| Alexion Pharmaceuticals IncCOM · shares New | 2.6% | $184.5M | — | ||||||||
| Maxim Integrated Prods IncCOM · shares −20% · price +31.1% | 2.4% | $169.6M | +$40.2M | ||||||||
| Varian Med Sys IncCOM · shares −8.9% · price +1.8% | 2.1% | $152.0M | +$2.6M | ||||||||
| Pnm Res IncCOM · shares New | 2.1% | $147.7M | — | ||||||||
| Navistar Intl Corp NewCOM · shares New | 1.7% | $123.6M | — | ||||||||
| Aerojet Rocketdyne Hldgs IncCOM · shares New | 1.7% | $122.3M | — | ||||||||
| Acacia Communications IncCOM · shares −9.0% · price +8.2% | 1.6% | $116.1M | +$8.8M | ||||||||
| Bmc Stk Hldgs IncCOM · shares −3.4% · price +25.3% | 1.5% | $102.9M | +$20.8M | ||||||||
| Slack Technologies IncCOM CL A · shares New | 1.4% | $100.4M | — | ||||||||
| Hms Hldgs CorpCOM · shares New | 1.1% | $78.9M | — | ||||||||
| Eidos Therapeutics IncCOM · shares New | 1.1% | $78.9M | — | ||||||||
| Tiffany & Co NewCOM · shares −10% · price +13.5% | 1.1% | $75.4M | +$8.9M | ||||||||
| Grubhub IncCOM · shares −18% · price +2.7% | 1.0% | $72.6M | +$1.9M | ||||||||
| Ftac Olympus Acquisition CorUNIT 08/24/2025 · shares −8.7% · price +8.7% | 1.0% | $71.4M | +$5.7M | ||||||||
| Multiplan CorporationCOM ADDED · shares New | 1.0% | $71.0M | — | ||||||||
| Parsley Energy IncCL A · shares New | 0.99% | $70.3M | — | ||||||||
| Fitbit IncCL A · shares −9.3% · price −2.3% | 0.96% | $68.0M | −$1.6M | ||||||||
| Norbord IncCOM NEW · shares New | 0.87% | $61.6M | — | ||||||||
| Ciig Merger CorpCOM CL A · shares +4,367% · price +180.8% | 0.77% | $54.6M | +$786,558 | ||||||||
| Churchill Cap Corp IiCL A · shares New | 0.73% | $51.8M | — | ||||||||
| Total · 693 positions | 100% | $7.08B | +$212.6M |
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 Q3 2020 to Q4 2020: 268 stocks held throughout, up $212.6M (+8.7%).
- Maxim Integrated Prods Inc+$40.2M+31%
- Bmc Stk Hldgs Inc+$20.8M+25%
- Sunnova Energy Intl Inc.+$13.3M+48%
- Tiffany & Co New+$8.9M+13%
- Acacia Communications Inc+$8.8M+8%
- Boston Scientific Corp−$369,609−6%
- Ppd Inc−$504,049−7%
- Osmotica Pharmaceuticals Plc−$549,790−24%
- Neovasc Inc−$857,028−56%
- Fitbit Inc−$1.6M−2%
Estimated as in the holdings table: shares held at both quarter ends times the change in price; options left out, 1 split read into the share counts.
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 ↗ |