Magnetar Financial LLC

New 13F: Q3 2026

Magnetar Financial LLC filed its 13F for the quarter ended Sep 30, 2026 on Nov 13, 2026: $4.5B in AI and semiconductor stocks; $78.3M bought and $420.8M sold against its previous quarter, at the quarter's prices.

• trimmed CoreWeave (CRWV): -$381.3M at the quarter's price
• added to Synaptics (SYNA): +$28.1M at the quarter's price
• sold out of SpaceX (SPCX): -$17.1M at the quarter's price
• opened a position in Cisco (CSCO): +$2.9M at the quarter's price
• opened a position in GitLab (GTLB): +$2.7M at the quarter's price
• trimmed Keysight Technologies (KEYS): -$2.2M at the quarter's price
• added to Intuit (INTU): +$2.2M at the quarter's price
• trimmed Salesforce (CRM): -$1.7M at the quarter's price
• added to Extreme Networks (EXTR): +$1.6M at the quarter's price
• added to Analog Devices (ADI): +$1.6M at the quarter's price

Magnetar Financial LLC declares $5.5B in 62 of the 230 AI and semiconductor companies tracked on Silicon Floor, as of Jun 30, 2026 (Form 13F): 49.9% of its $11.0B 13F portfolio. Largest positions: CoreWeave (9.4% of the company) and Dominion Energy (0.14% of the company). Over time: $5.5B in 62 of these companies for Q2 2026, against $21.4M in 33 for Q4 2019 (13F values as filed). From Mar 31, 2026 to Jun 30, 2026, it bought $123.3M and sold $1.8B of these stocks, at the quarter's prices: a net sale of $1.6B; 27 new positions and 18 sold out.

Performance of its AI picks

The AI-stock portfolio Magnetar Financial LLC declared for Q2 2026 (Form 13F), held unchanged, returned -12.0% in Q3 2026 (SMH -7.1%). Over the last 12 months, quarter after quarter: -34.9% (SMH +87.2%). Over three years, quarter after quarter: +187.1% (SMH +325.8%). Over five years, quarter after quarter: +214.9% (SMH +389.8%). Trades made during a quarter are not visible in 13F filings: this measures its declared picks, not the return of its funds.

Largest positions

1. CoreWeave (CRWV): $5.2B, 52.1M shares, 9.4% of the company, 47.3% of its portfolio (trimmed this quarter); held since Q1 2025
2. Dominion Energy (D): $83.3M, 1.2M shares, 0.14% of the company, 0.76% of its portfolio (new position this quarter)
3. Silicon Labs (SLAB): $54.9M, 251,225 shares, 0.75% of the company, 0.50% of its portfolio (added this quarter); held since Q1 2026
4. Qorvo (QRVO): $51.1M, 548,149 shares, 0.47% of its portfolio (added this quarter); held since Q2 2025
5. Veeco (VECO): $21.0M, 277,389 shares, 0.45% of the company, 0.19% of its portfolio (trimmed this quarter); held since Q4 2025
6. Synaptics (SYNA): $18.0M, 144,948 shares, 0.36% of the company, 0.16% of its portfolio (added this quarter); held since Q1 2026
7. SpaceX (SPCX): $17.1M, 100,000 shares, 0.00% of the company, 0.16% of its portfolio
8. Keysight Technologies (KEYS): $2.9M, 8,320 shares, 0.00% of the company, 0.03% of its portfolio (trimmed this quarter); held since Q4 2024
9. Synopsys (SNPS): $2.7M, 6,133 shares, 0.00% of the company, 0.03% of its portfolio (added this quarter); held since Q4 2025
10. Microsoft (MSFT): $2.2M, 5,885 shares, 0.00% of the company, 0.02% of its portfolio (added this quarter); held since Q2 2024
11. Salesforce (CRM): $2.0M, 12,789 shares, 0.00% of the company, 0.02% of its portfolio (new position this quarter)
12. Analog Devices (ADI): $1.5M, 3,877 shares, 0.00% of the company, 0.01% of its portfolio (trimmed this quarter); held since Q1 2026
13. MongoDB (MDB): $1.4M, 4,099 shares, 0.01% of the company, 0.01% of its portfolio (trimmed this quarter); held since Q2 2025
14. Jabil (JBL): $1.3M, 3,325 shares, 0.00% of the company, 0.01% of its portfolio (added this quarter); held since Q4 2025
15. Cirrus Logic (CRUS): $1.2M, 7,830 shares, 0.02% of the company, 0.01% of its portfolio (new position this quarter)

By sector

• Neoclouds & data centers: $5.2B, 95% of its AI holdings, 3 companies
• Chips & compute: $129.8M, 2% of its AI holdings, 12 companies
• Power, electrical & cooling: $87.6M, 2% of its AI holdings, 8 companies
• Equipment & test: $30.1M, 1% of its AI holdings, 10 companies
• Cloud & AI giants: $20.7M, 0% of its AI holdings, 4 companies
• AI software: $9.3M, 0% of its AI holdings, 7 companies
• Servers & systems: $3.8M, 0% of its AI holdings, 6 companies
• Interconnect: $3.1M, 0% of its AI holdings, 5 companies
• Optics: $2.0M, 0% of its AI holdings, 5 companies
• Memory & storage: $1.0M, 0% of its AI holdings, 2 companies

Biggest changes this quarter

• trimmed CoreWeave (CRWV): -$1.6B at the quarter's price
• opened a position in Dominion Energy (D): +$83.3M at the quarter's price
• trimmed Veeco (VECO): -$75.0M at the quarter's price
• added to Synaptics (SYNA): +$17.5M at the quarter's price
• sold out of Onto Innovation (ONTO): -$3.3M at the quarter's price
• trimmed MongoDB (MDB): -$3.1M at the quarter's price
• sold out of Broadcom (AVGO): -$2.9M at the quarter's price
• trimmed Benchmark Electronics (BHE): -$2.8M at the quarter's price
• sold out of Apple (AAPL): -$2.6M at the quarter's price
• trimmed Cummins (CMI): -$2.5M at the quarter's price

Schedule 13D/G declarations

• CoreWeave (CRWV): 13G filed May 6, 2026: 68.0M shares as of Apr 30, 2026, 14.9% as declared
• CoreWeave (CRWV): 13G filed Oct 7, 2025: 91.4M shares as of Sep 30, 2025, 23.3% as declared

Other holders of this size

• Alpha Wave Global, LP: $5.5B in 2 of these companies
• GATEWAY INVESTMENT ADVISERS LLC: $5.5B in 117 of these companies
• Police & Firemen's Retirement System of New Jersey: $5.4B in 205 of these companies
• Sustainable Growth Advisers, LP: $5.6B in 14 of these companies
• Capital Wealth Planning, LLC: $5.4B in 30 of these companies
• Varma Mutual Pension Insurance Co: $5.6B in 73 of these companies
• Kestra Advisory Services, LLC: $5.4B in 166 of these companies
• OFI INVEST ASSET MANAGEMENT: $5.6B in 75 of these companies

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