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 | |
|---|---|---|---|---|---|---|---|
| $10K | ﹤0.01% | +131 | New | +$10K | |||
| $10K | ﹤0.01% | +826 | New | +$10K | |||
| $10K | ﹤0.01% | 578 -1,783 | -76% | -$30.8K | |||
| $10K | ﹤0.01% | 192 +188 | +4,700% | +$9.79K | |||
| $10K | ﹤0.01% | 2,984 -9,537 | -76% | -$32K | |||
| $10K | ﹤0.01% | 162 -978 | -86% | -$60.4K | |||
| $10K | ﹤0.01% | 1,012 +935 | +1,214% | +$9.24K | |||
| $10K | ﹤0.01% | 3,639 +1,329 | +58% | +$3.65K | |||
| $10K | ﹤0.01% | 172 +70 | +69% | +$4.07K | |||
| $10K | ﹤0.01% | +2,497 | New | +$10K | |||
| $10K | ﹤0.01% | +592 | New | +$10K | |||
| $9K | ﹤0.01% | 10,975 -2,280 | -17% | -$1.87K | |||
| $9K | ﹤0.01% | 414 +258 | +165% | +$5.61K | |||
| $9K | ﹤0.01% | 128 -2,245 | -95% | -$158K | |||
| $9K | ﹤0.01% | 130 -106 | -45% | -$7.34K | |||
| $9K | ﹤0.01% | +594 | New | +$9K | |||
| $9K | ﹤0.01% | 1,887 +1,063 | +129% | +$5.07K | |||
| $9K | ﹤0.01% | +427 | New | +$9K | |||
| $9K | ﹤0.01% | +121 | New | +$9K | |||
| $9K | ﹤0.01% | 102 +58 | +132% | +$5.12K | |||
| $9K | ﹤0.01% | +1,558 | New | +$9K | |||
| $9K | ﹤0.01% | +395 | New | +$9K | |||
| $9K | ﹤0.01% | 429 +189 | +79% | +$3.97K | |||
| $9K | ﹤0.01% | 1,695 -654 | -28% | -$3.47K | |||
| $9K | ﹤0.01% | +1,690 | New | +$9K |
