Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| 1 | $278M | |
| 2 | $84.4M | |
| 3 | $76.9M | |
| 4 | $74.9M | |
| 5 | $53.5M |
Top Sells
| 1 | $497M | |
| 2 | $73.7M | |
| 3 | $41.8M | |
| 4 | $18.2M | |
| 5 | $16.9M |
Sector Composition
| 1 | Technology | 23.04% |
| 2 | Consumer Discretionary | 11.84% |
| 3 | Healthcare | 9.52% |
| 4 | Communication Services | 8.77% |
| 5 | Financials | 7.07% |
| # | Name | Market Value | Portfolio Weight | Shares or Principal | Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|---|
| $278M | 0.18% | 3,057,978 | New | +$278M | |||
| $121M | 0.08% | 1,113,380 +709,408 | +176% | +$76.9M | |||
| $84.4M | 0.05% | 545,647 | New | +$84.4M | |||
| $79.8M | 0.05% | 480,522 +451,305 | +1,545% | +$74.9M | |||
| $76.8M | 0.05% | 3,380,296 -190,644 | -5% | -$4.33M | |||
| $56.8M | 0.04% | 653,938 +613,262 | +1,508% | +$53.3M | |||
| $55.3M | 0.04% | 248,768 -2,235,748 | -90% | -$497M | |||
| $53.5M | 0.03% | 281,158 | New | +$53.5M | |||
| $41M | 0.03% | 1,616,802 +50,149 | +3% | +$1.27M | |||
| $36.8M | 0.02% | 519,037 -168,447 | -25% | -$12M | |||
| $34.1M | 0.02% | 537,279 -53,645 | -9% | -$3.41M | |||
| $32.8M | 0.02% | 35,144 | New | +$32.8M | |||
| $30.4M | 0.02% | 117,279 +107,115 | +1,054% | +$27.8M | |||
| $30.3M | 0.02% | 328,925 +65,746 | +25% | +$6.05M | |||
| $27.2M | 0.02% | 135,142 +75,144 | +125% | +$15.2M | |||
| $27M | 0.02% | 252,824 +67,022 | +36% | +$7.16M | |||
| $25.8M | 0.02% | 78,302 -8,753 | -10% | -$2.88M | |||
| $24M | 0.02% | 1,235,654 -582,333 | -32% | -$11.3M | |||
| $23.5M | 0.02% | 503,019 | New | +$23.5M | |||
| $23.1M | 0.01% | 253,933 +151,761 | +149% | +$13.8M | |||
| $22.7M | 0.01% | 650,233 +647,364 | +22,564% | +$22.6M | |||
| $22.5M | 0.01% | 332,331 -125,135 | -27% | -$8.48M | |||
| $20.1M | 0.01% | 495,320 +39,852 | +9% | +$1.62M | |||
| $19.6M | 0.01% | 1,055,768 -122,901 | -10% | -$2.28M | |||
| $19.5M | 0.01% | 241,039 -61,655 | -20% | -$5M |
