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 | 23.04% |
| 2 | Consumer Discretionary | 11.84% |
| 3 | Healthcare | 9.52% |
| 4 | Communication Services | 8.77% |
| 5 | Financials | 7.07% |
| # | Name | Market Value | Portfolio Weight | Shares or Principal | Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|---|
| $1.32M | 0% | 16,353 | New | +$1.32M | |||
| $1.31M | 0% | 7,129 +5,105 | +252% | +$941K | |||
| $1.31M | 0% | 29,228 +16,795 | +135% | +$753K | |||
| $1.31M | 0% | 122,208 | New | +$1.31M | |||
| $1.3M | 0% | 36,054 +25,643 | +246% | +$925K | |||
| $1.29M | 0% | 44,052 | New | +$1.29M | |||
| $1.28M | 0% | 19,582 | New | +$1.28M | |||
| $1.26M | 0% | 17,613 +5,234 | +42% | +$374K | |||
| $1.26M | 0% | 13,049 -4,193 | -24% | -$405K | |||
| $1.25M | 0% | 25,934 +20,447 | +373% | +$989K | |||
| $1.25M | 0% | 48,416 | New | +$1.25M | |||
| $1.25M | 0% | 22,872 | New | +$1.25M | |||
| $1.24M | 0% | 63,476 | New | +$1.24M | |||
| $1.24M | 0% | 781,578 +300,223 | +62% | +$477K | |||
| $1.24M | 0% | 48,683 +37,574 | +338% | +$959K | |||
| $1.22M | 0% | 13,773 +13,045 | +1,792% | +$1.16M | |||
| $1.22M | 0% | 11,951 -40,716 | -77% | -$4.17M | |||
| $1.22M | 0% | 9,240 -2,354 | -20% | -$312K | |||
| $1.22M | 0% | 10,771 +712 | +7% | +$80.6K | |||
| $1.21M | 0% | 40,024 | New | +$1.21M | |||
| $1.21M | 0% | 86,303 | New | +$1.21M | |||
| $1.21M | 0% | 14,761 +7,458 | +102% | +$609K | |||
| $1.2M | 0% | 21,956 | New | +$1.2M | |||
| $1.19M | 0% | 25,258 | New | +$1.19M | |||
| $1.19M | 0% | 28,206 | New | +$1.19M |
