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 | $216M | |
| 2 | $159M | |
| 3 | $128M | |
| 4 | $62.2M | |
| 5 | $61.9M |
Top Sells
| 1 | $141M | |
| 2 | $53.1M | |
| 3 | $45.7M | |
| 4 | $45.3M | |
| 5 | $38.3M |
Sector Composition
| 1 | Technology | 34.74% |
| 2 | Communication Services | 9% |
| 3 | Consumer Discretionary | 8.67% |
| 4 | Healthcare | 8.07% |
| 5 | Financials | 6.4% |
| # | Name | Market Value | Portfolio Weight | Shares or Principal | Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|---|
| $13K | ﹤0.01% | 12,615 +3,810 | +43% | +$3.93K | |||
| $13K | ﹤0.01% | +1,684 | New | +$13K | |||
| $13K | ﹤0.01% | 6,016 -712 | -11% | -$1.54K | |||
| $13K | ﹤0.01% | +46 | New | +$13K | |||
| $13K | ﹤0.01% | 495 +357 | +259% | +$9.38K | |||
| $13K | ﹤0.01% | +337 | New | +$13K | |||
| $13K | ﹤0.01% | 1,007 +314 | +45% | +$4.05K | |||
| $12K | ﹤0.01% | 10,831 -5,542 | -34% | -$6.14K | |||
| $12K | ﹤0.01% | 5,669 +3,094 | +120% | +$6.55K | |||
| $12K | ﹤0.01% | 2,838 -630 | -18% | -$2.66K | |||
| $12K | ﹤0.01% | 263 +257 | +4,283% | +$11.7K | |||
| $12K | ﹤0.01% | 7,417 -1,387 | -16% | -$2.24K | |||
| $12K | ﹤0.01% | 427 +243 | +132% | +$6.83K | |||
| $12K | ﹤0.01% | 7,380 +2,002 | +37% | +$3.26K | |||
| $12K | ﹤0.01% | 6,376 +6,138 | +2,579% | +$11.6K | |||
| $12K | ﹤0.01% | +3,546 | New | +$12K | |||
| $12K | ﹤0.01% | 203 -3,008 | -94% | -$178K | |||
| $12K | ﹤0.01% | +197 | New | +$12K | |||
| $12K | ﹤0.01% | +11,317 | New | +$12K | |||
| $12K | ﹤0.01% | 275 -1,544 | -85% | -$67.4K | |||
| $12K | ﹤0.01% | 17,790 +4,404 | +33% | +$2.97K | |||
| $12K | ﹤0.01% | 1,431 +1,236 | +634% | +$10.4K | |||
| $12K | ﹤0.01% | 345 -108 | -24% | -$3.76K | |||
| $12K | ﹤0.01% | 861 -539 | -39% | -$7.51K | |||
| $12K | ﹤0.01% | +306 | New | +$12K |
