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 | |
|---|---|---|---|---|---|---|---|
| $18.9M | 0.01% | 36,061 +5,973 | +20% | +$3.13M | |||
| $16.6M | 0.01% | 239,010 | New | +$16.6M | |||
| $16.3M | 0.01% | 61,672 -37,223 | -38% | -$9.85M | |||
| $16.3M | 0.01% | 227,152 -55,316 | -20% | -$3.97M | |||
| $15.9M | 0.01% | 328,401 -350,811 | -52% | -$16.9M | |||
| $15.1M | 0.01% | 87,558 +10,334 | +13% | +$1.78M | |||
| $14.5M | 0.01% | 86,845 | New | +$14.5M | |||
| $14.1M | 0.01% | 882,724 -117,614 | -12% | -$1.88M | |||
| $13.8M | 0.01% | 36,777 +34,181 | +1,317% | +$12.8M | |||
| $13M | 0.01% | 2,827 -772 | -21% | -$3.56M | |||
| $12.9M | 0.01% | 81,620 -51,979 | -39% | -$8.22M | |||
| $12.5M | 0.01% | 1,074,410 +515,627 | +92% | +$6M | |||
| $12.3M | 0.01% | 1,223,600 +367,517 | +43% | +$3.69M | |||
| $12.2M | 0.01% | 123,121 +46,086 | +60% | +$4.55M | |||
| $12.1M | 0.01% | 65,971 | New | +$12.1M | |||
| $11.7M | 0.01% | 74,827 -15,351 | -17% | -$2.4M | |||
| $11.7M | 0.01% | 1,086,804 -655,135 | -38% | -$7.03M | |||
| $11.6M | 0.01% | 31,546 | New | +$11.6M | |||
| $11.5M | 0.01% | 97,380 | New | +$11.5M | |||
| $11.5M | 0.01% | 188,899 -147,729 | -44% | -$9.01M | |||
| $11.5M | 0.01% | 82,337 | New | +$11.5M | |||
| $11.5M | 0.01% | 570,560 +479,153 | +524% | +$9.63M | |||
| $11.3M | 0.01% | 53,855 +11,762 | +28% | +$2.46M | |||
| $10.9M | 0.01% | 260,039 -2,053 | -0.8% | -$85.8K | |||
| $10.5M | 0.01% | 50,713 | New | +$10.5M |
