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 | |
|---|---|---|---|---|---|---|---|
| $41K | ﹤0.01% | 912 -26,624 | -97% | -$1.2M | |||
| $40K | ﹤0.01% | +3,543 | New | +$40K | |||
| $40K | ﹤0.01% | +5,991 | New | +$40K | |||
| $40K | ﹤0.01% | 15,326 +10,196 | +199% | +$26.6K | |||
| $40K | ﹤0.01% | +195 | New | +$40K | |||
| $40K | ﹤0.01% | +4,524 | New | +$40K | |||
| $40K | ﹤0.01% | 1,665 -236 | -12% | -$5.67K | |||
| $39K | ﹤0.01% | 4,065 +3,076 | +311% | +$29.5K | |||
| $39K | ﹤0.01% | 11,106 -3,252 | -23% | -$11.4K | |||
| $39K | ﹤0.01% | 675 +662 | +5,092% | +$38.2K | |||
| $39K | ﹤0.01% | +393 | New | +$39K | |||
| $38K | ﹤0.01% | 2,004 -2,806 | -58% | -$53.2K | |||
| $38K | ﹤0.01% | 39,183 +11,592 | +42% | +$11.2K | |||
| $38K | ﹤0.01% | 1,598 -2,386 | -60% | -$56.7K | |||
| $38K | ﹤0.01% | +1,875 | New | +$38K | |||
| $38K | ﹤0.01% | 8,634 +8,602 | +26,881% | +$37.9K | |||
| $38K | ﹤0.01% | 949 +907 | +2,160% | +$36.3K | |||
| $37K | ﹤0.01% | +911 | New | +$37K | |||
| $37K | ﹤0.01% | +800 | New | +$37K | |||
| $37K | ﹤0.01% | +47 | New | +$37K | |||
| $37K | ﹤0.01% | 484 +188 | +64% | +$14.4K | |||
| $37K | ﹤0.01% | 271 +221 | +442% | +$30.2K | |||
| $37K | ﹤0.01% | 354 -3,417 | -91% | -$357K | |||
| $37K | ﹤0.01% | 13,118 -10,709 | -45% | -$30.2K | |||
| $37K | ﹤0.01% | 570 +403 | +241% | +$26.2K |
