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 | |
|---|---|---|---|---|---|---|---|
| $22K | ﹤0.01% | 8,273 -1,718 | -17% | -$4.57K | |||
| $22K | ﹤0.01% | +5,443 | New | +$22K | |||
| $22K | ﹤0.01% | +700 | New | +$22K | |||
| $22K | ﹤0.01% | 2,935 +2,617 | +823% | +$19.6K | |||
| $22K | ﹤0.01% | 3,490 +3,461 | +11,934% | +$21.8K | |||
| $22K | ﹤0.01% | 423 +105 | +33% | +$5.46K | |||
| $22K | ﹤0.01% | 20,280 +19,654 | +3,140% | +$21.3K | |||
| $22K | ﹤0.01% | +7,293 | New | +$22K | |||
| $22K | ﹤0.01% | 178 +68 | +62% | +$8.4K | |||
| $22K | ﹤0.01% | 177 -608 | -77% | -$75.6K | |||
| $22K | ﹤0.01% | +832 | New | +$22K | |||
| $21K | ﹤0.01% | 1,464 -231 | -14% | -$3.31K | |||
| $21K | ﹤0.01% | 29,312 +29,090 | +13,104% | +$20.8K | |||
| $21K | ﹤0.01% | 428 +128 | +43% | +$6.28K | |||
| $21K | ﹤0.01% | 1,895 +1,834 | +3,007% | +$20.3K | |||
| $21K | ﹤0.01% | +536 | New | +$21K | |||
| $21K | ﹤0.01% | 788 +587 | +292% | +$15.6K | |||
| $21K | ﹤0.01% | 29,107 +10,792 | +59% | +$7.79K | |||
| $21K | ﹤0.01% | +4,971 | New | +$21K | |||
| $21K | ﹤0.01% | 2,446 -228 | -9% | -$1.96K | |||
| $21K | ﹤0.01% | +797 | New | +$21K | |||
| $21K | ﹤0.01% | 534 -176 | -25% | -$6.92K | |||
| $20K | ﹤0.01% | 2,111 -2,267 | -52% | -$21.5K | |||
| $20K | ﹤0.01% | 761 -1,608 | -68% | -$42.3K | |||
| $20K | ﹤0.01% | +206 | New | +$20K |
