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 | 22.97% |
| 2 | Consumer Discretionary | 12.26% |
| 3 | Healthcare | 9.52% |
| 4 | Communication Services | 8.42% |
| 5 | Financials | 7.07% |
| # | Name | Market Value | Portfolio Weight | Shares or Principal | Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|---|
| $13K | 0% | 810 -611 | -43% | -$9.81K | |||
| $13K | 0% | 1,111 +714 | +180% | +$8.36K | |||
| $13K | 0% | 18,315 +16,269 | +795% | +$11.5K | |||
| $13K | 0% | 2,447 -66,422 | -96% | -$353K | |||
| $13K | 0% | 475 | New | +$13K | |||
| $13K | 0% | 1,300 | New | +$13K | |||
| $13K | 0% | 406 | New | +$13K | |||
| $13K | 0% | 400 | New | +$13K | |||
| $13K | 0% | 430 -506 | -54% | -$15.3K | |||
| $12K | 0% | 746 | New | +$12K | |||
| $12K | 0% | 278 | New | +$12K | |||
| $12K | 0% | 2,578 +1,299 | +102% | +$6.05K | |||
| $12K | 0% | 18,680 | New | +$12K | |||
| $12K | 0% | 5,030 | New | +$12K | |||
| $12K | 0% | 20,801 +19,531 | +1,538% | +$11.3K | |||
| $12K | 0% | 770 +13 | +2% | +$203 | |||
| $12K | 0% | 1,997 +948 | +90% | +$5.7K | |||
| $12K | 0% | 213 +103 | +94% | +$5.8K | |||
| $12K | 0% | 293 -135 | -32% | -$5.53K | |||
| $12K | 0% | 1,613 -57,652 | -97% | -$429K | |||
| $12K | 0% | 471 | New | +$12K | |||
| $12K | 0% | 12,781 -5,578 | -30% | -$5.24K | |||
| $12K | 0% | 1,100 | New | +$12K | |||
| $12K | 0% | 952 +337 | +55% | +$4.25K | |||
| $12K | 0% | 983 -717 | -42% | -$8.75K |
