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 | |
|---|---|---|---|---|---|---|---|
| $728K | 0% | 296,234 +82,493 | +39% | +$203K | |||
| $727K | 0% | 57,092 +40,785 | +250% | +$519K | |||
| $720K | 0% | 17,934 | New | +$720K | |||
| $718K | 0% | 70,512 +63,125 | +855% | +$643K | |||
| $716K | 0% | 83,038 | New | +$716K | |||
| $712K | 0% | 138,623 +124,874 | +908% | +$641K | |||
| $699K | 0% | 98,924 -41,595 | -30% | -$294K | |||
| $696K | 0% | 230,025 +224,026 | +3,734% | +$678K | |||
| $695K | 0% | 8,405 -2,628 | -24% | -$217K | |||
| $683K | 0% | 68,261 +23,223 | +52% | +$232K | |||
| $681K | 0% | 23,652 +20,135 | +573% | +$580K | |||
| $681K | 0% | 48,357 +47,540 | +5,819% | +$669K | |||
| $680K | 0% | 107,677 -169,600 | -61% | -$1.07M | |||
| $676K | 0% | 55,551 -84,039 | -60% | -$1.02M | |||
| $669K | 0% | 34,775 +31,447 | +945% | +$605K | |||
| $667K | 0% | 1,151 | New | +$667K | |||
| $667K | 0% | 9,502 +5,442 | +134% | +$382K | |||
| $666K | 0% | 27,728 | New | +$666K | |||
| $665K | 0% | 26,468 | New | +$665K | |||
| $664K | 0% | 15,298 | New | +$664K | |||
| $658K | 0% | 80,903 +61,295 | +313% | +$499K | |||
| $655K | 0% | 16,878 +11,284 | +202% | +$438K | |||
| $653K | 0% | 56,241 | New | +$653K | |||
| $652K | 0% | 6,663 | New | +$652K | |||
| $651K | 0% | 174,136 | New | +$651K |
