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 | |
|---|---|---|---|---|---|---|---|
| $292K | 0% | 2,341 | New | +$292K | |||
| $292K | 0% | 96,852 +83,691 | +636% | +$252K | |||
| $291K | 0% | 30,727 -34,483 | -53% | -$327K | |||
| $290K | 0% | 74,984 +7,509 | +11% | +$29K | |||
| $289K | 0% | 8,524 -1,786 | -17% | -$60.6K | |||
| $288K | 0% | 15,756 -2,331 | -13% | -$42.6K | |||
| $287K | 0% | 106,571 +15,770 | +17% | +$42.5K | |||
| $285K | 0% | 13,046 | New | +$285K | |||
| $284K | 0% | 10,550 | New | +$284K | |||
| $283K | 0% | 50,511 -21,521 | -30% | -$121K | |||
| $280K | 0% | 20,521 -7,722 | -27% | -$105K | |||
| $280K | 0% | 19,703 +16,089 | +445% | +$229K | |||
| $279K | 0% | 47,856 +37,628 | +368% | +$219K | |||
| $277K | 0% | 3,535 | New | +$277K | |||
| $276K | 0% | 4,716 | New | +$276K | |||
| $273K | 0% | 8,315 | New | +$273K | |||
| $271K | 0% | 15,961 +11,377 | +248% | +$193K | |||
| $268K | 0% | 2,145 -501 | -19% | -$62.6K | |||
| $268K | 0% | 49,116 | New | +$268K | |||
| $268K | 0% | 16,600 -33,776 | -67% | -$545K | |||
| $268K | 0% | 68,473 -715,663 | -91% | -$2.8M | |||
| $266K | 0% | 9,073 -33,404 | -79% | -$979K | |||
| $266K | 0% | 797 -803 | -50% | -$268K | |||
| $265K | 0% | 138,470 +9,488 | +7% | +$18.2K | |||
| $265K | 0% | 11,898 | New | +$265K |
