13F filer · CIK 1352851 ↗
Magnetar Financial LLC
You are looking at Q1 2019. See the latest, Q2 2026 →
Reported value
$3.89B
−4.7% on the quarter before
Positions
416
245 new · 102 sold out
Top 10
52.0%
of the value
Est. gain
+$82.5M
on stocks held all quarter
Est. return
+4.4%
on those stocks since Q4 2018
Positions as of Mar 31, 2019, 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
Each tile is a position, sized by its share, colored by what the fund did with it since Q4 2018. Striped tiles are options.
Largest buys
Since Q4 2018, 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.
- First Data Corp New~$241.5MAdded · 0.1% → 6.3%+9,193,356 shares
- Worldpay Inc~$235.2MNew · 0.0% → 6.1%+2,072,229 shares
- Mellanox Technologies Ltd~$225.9MNew · 0.0% → 5.8%+1,908,540 shares
- Celgene Corp~$182.6MNew · 0.0% → 4.7%+1,935,806 shares
- Wellcare Health Plans Inc~$159.6MAdded · 0.0% → 4.1%+591,495 shares
- Spark Therapeutics Inc~$104.3MNew · 0.0% → 2.7%+916,239 shares
- Wabco Hldgs Inc~$97.8MNew · 0.0% → 2.5%+741,837 shares
- Luxoft Hldg Inc~$75.3MNew · 0.0% → 1.9%+1,282,196 shares
- Nightstar Therapeutics Plc~$32.2MNew · 0.0% → 0.8%+1,267,567 shares
- Fintech Acquisition Corp Iii~$26.3MNew · 0.0% → 0.7%+2,700,000 shares
Largest sells
Since Q4 2018, 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.
- Shire Plc~$198.9MSold out · 4.9% → 0.0%−1,142,590 shares
- Vectren Corp~$186.8MSold out · 4.6% → 0.0%−2,594,786 shares
- Scana Corp New~$175.4MSold out · 4.3% → 0.0%−3,670,496 shares
- Esterline Technologies Corp~$147.1MSold out · 3.6% → 0.0%−1,211,582 shares
- Newfield Expl Co~$138.5MSold out · 3.4% → 0.0%−9,446,896 shares
- Avista Corp~$111.9MCut · 3.2% → 0.3%−2,754,966 shares
- Tesaro Inc~$102.5MSold out · 2.5% → 0.0%−1,379,798 shares
- Sendgrid Inc~$87.0MSold out · 2.1% → 0.0%−2,016,423 shares
- Nxstage Medical Inc~$84.9MSold out · 2.1% → 0.0%−2,967,320 shares
- Nutri Sys Inc New~$82.2MSold out · 2.0% → 0.0%−1,873,846 shares
Holdings
As of Mar 31, 2019. Changes are in shares against Dec 31, 2018, so a price move alone never reads as a buy or a sale.
| Holding | Value | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| First Data Corp NewCOM CL A · shares +4,837% · price +55.3% | 6.3% | $246.5M | +$1.8M | ||||||||
| Worldpay IncCL A · shares New | 6.1% | $235.2M | — | ||||||||
| Mellanox Technologies LtdSHS · shares New | 5.8% | $225.9M | — | ||||||||
| Red Hat IncCOM · shares −5.7% · price +4.0% | 5.5% | $212.6M | +$8.2M | ||||||||
| Tribune Media CoCL A · shares −7.5% · price +1.7% | 5.3% | $204.4M | +$3.4M | ||||||||
| Integrated Device TechnologyCOM · shares −2.1% · price +1.2% | 5.3% | $204.0M | +$2.3M | ||||||||
| Arris International PlcSHS · shares −16% · price +3.4% | 5.2% | $201.8M | +$6.6M | ||||||||
| Celgene CorpCOM · shares New | 4.7% | $182.6M | — | ||||||||
| Wellcare Health Plans IncCOM · shares +21,125% · price +14.3% | 4.1% | $160.3M | +$94,300 | ||||||||
| U S G CorpCOM NEW · shares −7.5% · price +1.5% | 3.7% | $145.3M | +$2.1M | ||||||||
| Sprint CorporationCOM · shares −7.7% · price −2.9% | 3.5% | $137.1M | −$4.1M | ||||||||
| Finisar CorpCOM NEW · shares −8.7% · price +7.3% | 3.2% | $123.1M | +$8.3M | ||||||||
| Spark Therapeutics IncCOM · shares New | 2.7% | $104.3M | — | ||||||||
| Wabco Hldgs IncCOM · shares New | 2.5% | $97.8M | — | ||||||||
| Belmond LtdCL A · shares −13% · price −0.4% | 2.0% | $77.0M | −$308,852 | ||||||||
| Luxoft Hldg IncORD SHS CL A · shares New | 1.9% | $75.3M | — | ||||||||
| Churchill Cap CorpCOM CL A · shares 0% · price +40.7% | 1.9% | $73.9M | +$21.4M | ||||||||
| Energy Transfer LpCOM UT LTD PTN · shares −10% · price +16.4% | 1.7% | $67.8M | +$9.5M | ||||||||
| Pacific Biosciences Calif InCOM · shares −11% · price −2.3% | 1.5% | $59.4M | −$1.4M | ||||||||
| Bemis Co IncCOM · shares −8.3% · price +20.9% | 1.3% | $51.7M | +$8.9M | ||||||||
| Stewart Information Svcs CorCOM · shares −9.2% · price +3.1% | 1.1% | $42.1M | +$1.3M | ||||||||
| Infrareit IncCOM · shares −9.1% · price −0.2% | 1.0% | $39.6M | −$94,473 | ||||||||
| Nightstar Therapeutics PlcADR · shares New | 0.83% | $32.2M | — | ||||||||
| Fintech Acquisition Corp IiiCOM CL A ADDED · shares New | 0.68% | $26.3M | — | ||||||||
| Microchip TechnologyNOTE 2.250% 2/1 · shares +489% · price +12.5% | 0.67% | $25.9M | — | ||||||||
| Total · 416 positions | 100% | $3.89B | +$82.5M |
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 2018 to Q1 2019: 157 stocks held throughout, up $82.5M (+4.4%).
- Churchill Cap Corp+$21.4M+41%
- Energy Transfer Lp+$9.5M+16%
- Bemis Co Inc+$8.9M+21%
- Finisar Corp+$8.3M+7%
- Red Hat Inc+$8.2M+4%
- Pacific Biosciences Calif In−$1.4M−2%
- Altus Midstream Co−$1.6M−24%
- Cigna Corp New−$2.0M−15%
- Exterran Corp−$2.8M−11%
- Sprint Corporation−$4.1M−3%
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 ↗ |