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 | 34.86% |
| 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 | |
|---|---|---|---|---|---|---|---|
| $8K | ﹤0.01% | 532 +379 | +248% | +$5.7K | |||
| $8K | ﹤0.01% | +68 | New | +$8K | |||
| $8K | ﹤0.01% | +490 | New | +$8K | |||
| $8K | ﹤0.01% | 22,784 +3,100 | +16% | +$1.09K | |||
| $8K | ﹤0.01% | 459 +351 | +325% | +$6.12K | |||
| $8K | ﹤0.01% | 180 +114 | +173% | +$5.07K | |||
| $8K | ﹤0.01% | +642 | New | +$8K | |||
| $8K | ﹤0.01% | 32,315 -22,884 | -41% | -$5.67K | |||
| $8K | ﹤0.01% | 9,072 -1,070 | -11% | -$944 | |||
| $8K | ﹤0.01% | 1,074 -211 | -16% | -$1.57K | |||
| $8K | ﹤0.01% | 5,064 -32,175 | -86% | -$50.8K | |||
| $8K | ﹤0.01% | 4,666 -19,100 | -80% | -$32.7K | |||
| $8K | ﹤0.01% | 1,160 -453 | -28% | -$3.12K | |||
| $8K | ﹤0.01% | +425 | New | +$8K | |||
| $8K | ﹤0.01% | 633 +300 | +90% | +$3.79K | |||
| $8K | ﹤0.01% | 357 +324 | +982% | +$7.26K | |||
| $8K | ﹤0.01% | +312 | New | +$8K | |||
| $8K | ﹤0.01% | +1,840 | New | +$8K | |||
| $8K | ﹤0.01% | 166 +118 | +246% | +$5.69K | |||
| $8K | ﹤0.01% | +6,396 | New | +$8K | |||
| $8K | ﹤0.01% | +301 | New | +$8K | |||
| $8K | ﹤0.01% | 224 -2,434 | -92% | -$86.9K | |||
| $8K | ﹤0.01% | 47 -11,214 | -100% | -$1.91M | |||
| $8K | ﹤0.01% | +169 | New | +$8K | |||
| $8K | ﹤0.01% | 273 +159 | +139% | +$4.66K |
